TSI Instruments FHC50, FHM10 Operation And Service Manual

FUME HOOD

CONTROLLER/MONITOR

MODEL FHC50/FHM10

OPERATION AND SERVICE MANUAL

P/N 6003830, REVISION G

MARCH 2016

FUME HOOD

CONTROLLER/MONITOR

MODEL FHC50/FHM10

OPERATION AND SERVICE MANUAL

P/N 6003830, REVISION G

MARCH 2016

U.S. AND CANADA OTHER COUNTRIES

Sales & Customer Service: Sales & Customer Service:
[phone]/[phone] (001 651) 490-2811
Fax: Fax:
[phone] (001 651) 490-3824

SHIP/MAIL TO: E-MAIL

TSI Incorporated [e-mail]
ATTN: Customer Service
500 Cardigan Road WEB SITE
Shoreview, MN 55126 www.tsi.com
USA

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Copyright  TSI Incorporated / 2010-2016 / All rights reserved.
Part number 6003830/ Revision G / March 2016
LIMITATION OF WARRANTY AND LIABILITY (effective February 2015)

(For country-specific terms and conditions outside of the USA, please visit www.tsi.com.)
Seller warrants the goods, excluding software, sold hereunder, under normal use and service as described in the

operator's manual, to be free from defects in workmanship and material for 24 months, or if less, the length of
time specified in the operator's manual, from the date of shipment to the customer. This warranty period is
inclusive of any statutory warranty. This limited warranty is subject to the following exclusions and
exceptions:

a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when

indicated in specifications, are warranted for 90 days from the date of shipment;
b. Pumps are warranted for hours of operation as set forth in product or operator’s manuals;
c. Parts repaired or replaced as a result of repair services are warranted to be free from defects in

workmanship and material, under normal use, for 90 days from the date of shipment;
d. This warranty does not cover calibration requirements, and seller warrants only that the instrument or product

is properly calibrated at the time of its manufacture. Instruments returned for calibration are not covered by

this warranty;
f. This warranty is VOID if the instrument is opened by anyone other than a factory authorized service center

with the one exception where requirements set forth in the manual allow an operator to replace consumables

or perform recommended cleaning;
g. This warranty is VOID if the product has been misused, neglected, subjected to accidental or intentional

damage, or is not properly installed, maintained, or cleaned according to the requirements of the manual.

Unless specifically authorized in a separate writing by Seller, Seller makes no warranty with respect to, and

shall have no liability in connection with, goods which are incorporated into other products or equipment, or

which are modified by any person other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO OTHER

EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY
IS MADE. WITH RESPECT TO SELLER’S BREACH OF THE IMPLIED WARRANTY AGAINST
INFRINGEMENT, SAID WARRANTY IS LIMITED TO CLAIMS OF DIRECT INFRINGEMENT AND EXCLUDES

CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS. BUYER’S EXCLUSIVE REMEDY SHALL BE

THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR REASONABLE WEAR AND TEAR OR AT

SELLER’S OPTION REPLACEMENT OF THE GOODS WITH NON-INFRINGING GOODS.
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND THE

LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES CONCERNING THE
GOODS (INCLUDING CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY OR
OTHERWISE) SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE
PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR REPLACEMENT OF THE GOODS. IN THE
CASE OF SOFTWARE, SELLER WILL REPAIR OR REPLACE DEFECTIVE SOFTWARE OR IF UNABLE TO
DO SO, WILL REFUND THE PURCHASE PRICE OF THE SOFTWARE. IN NO EVENT SHALL SELLER BE

LIABLE FOR LOST PROFITS, BUSINESS INTERRUPTION, OR ANY SPECIAL, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR

INSTALLATION, DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless of form,
may be brought against Seller more than 12 months after a cause of action has accrued. The goods returned
under warranty to Seller's factory shall be at Buyer's risk of loss, and will be returned, if at all, at Seller's risk of
loss.

Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY, which
contains the complete and exclusive limited warranty of Seller. This LIMITATION OF WARRANTY AND
LIABILITY may not be amended, modified or its terms waived, except by writing signed by an Officer of Seller.

SERVICE POLICY

Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers, our
service policy is designed to give prompt attention to any problems. If any malfunction is discovered, please
contact your nearest sales office or representative, or call TSI's Customer Service department at (800) 874­2811 or [phone].

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TRADEMARKS

TSI, TSI logo, VELOCICALC, are registered trademarks of TSI Incorporated.
BACnet is a trademark of ASHRAE.
Modbus is a registered trademark of Modicon, Inc.
LonWorks is a registered trademark of Echelon® Corporation.

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CONTENTS

HOW TO USE THIS MANUAL ...................................................................................................... 1

Safety Information ................................................................................................ 1

Description of Caution Symbol .......................................................................... 1

Access Code ..................................................................................................... 1

PART ONE ..................................................................................................................................... 3

User Basics .......................................................................................................... 3

The Instrument ..................................................................................................... 3

Face Velocity ..................................................................................................... 3

Exhaust Flow ..................................................................................................... 3

Useful User Information .................................................................................... 4

Operator Panel ..................................................................................................... 4

LED Lights ......................................................................................................... 4

Display Screen .................................................................................................. 5

User Soft Keys (Normal Operating Mode) ........................................................ 5

Quick Keys ........................................................................................................ 5

Operator Keys ................................................................................................... 6

USB Port ........................................................................................................... 6

Alarms................................................................................................................... 6

Visual Alarm ...................................................................................................... 6

Audible Alarm—EMERGENCY key .................................................................. 7

Audible Alarms—All Except Emergency ........................................................... 7

Before Calling TSI ................................................................................................ 7

PART TWO ..................................................................................................................................... 9

Technical Section ................................................................................................. 9

Software Programming ....................................................................................... 10

Programming Keys .......................................................................................... 10

Menu Soft Keys ............................................................................................... 10

Quick Keys ...................................................................................................... 11

Keystroke Procedure ....................................................................................... 11

Programming Example .................................................................................... 12

Hardware Configurations .................................................................................... 13

Model FHC50 Controller Modes ..................................................................... 13

Model FHM10 Fume Hood Monitor Modes ..................................................... 14

Menu and Menu Items ........................................................................................ 15

CONFIGURE MENU ....................................................................................... 17

SETPOINT/ALARM CONSTRAINTS .............................................................. 30

INTERFACE MENU ........................................................................................ 31

NETWORK SETTINGS SUBMENU ................................................................ 31

Calibration .......................................................................................................... 49

Face Velocity Calibration ................................................................................ 49

Sash Position Calibration ................................................................................ 50

Flow Calibration............................................................................................... 51

Sash Opening Calibration ............................................................................... 55

Optimizing Controller Performance .................................................................... 56

Maintenance and Repair Parts ........................................................................... 56

System Component Inspection ....................................................................... 57

iv

Velocity Sensor Cleaning ................................................................................ 57

Replacement Parts .......................................................................................... 58

Troubleshooting Section ..................................................................................... 58

Hardware Test ................................................................................................. 58

Diagnostics Menu ............................................................................................ 60

Troubleshooting Chart ..................................................................................... 63

APPENDIX A ................................................................................................................................ 71

Specifications* .................................................................................................... 71

APPENDIX B ................................................................................................................................ 73

Network Communications .................................................................................. 73

Modbus® Communications ................................................................................. 73

Unique to TSI .................................................................................................. 73

Network Points ................................................................................................ 73

N2 Communications Description of Variables ................................................... 77

Description of Variables .................................................................................. 77

Variable Map ................................................................................................... 78

LonWorks® Object .............................................................................................. 80

Node Object Network Variables ...................................................................... 80

Fume Hood Controller Object Network Variables ........................................... 80

Description of LON SNVTs ............................................................................. 82

FHC50 BACnet® MS/TP Protocol Implementation Conformance Statement..... 83

BACnet® MS/TP Object Set ................................................................................ 85

APPENDIX C ................................................................................................................................ 89

Wiring Information .............................................................................................. 89

Back Panel Wiring ........................................................................................... 89

APPENDIX D ................................................................................................................................ 97

Access Codes / Password .................................................................................. 97

1

C a u t i o n

Caution indicates:

 Equipment may be damaged if procedures are not followed.
 Improper settings may result in loss of containment.
 Important information about unit operation.

How to Use This Manual

The Operation and Service Manual describes how to operate, configure, calibrate, maintain and
troubleshoot the Model FHM10 Fume Hood Monitor and Model FHC50 Fume Hood Controller.
The manual is divided into two parts. Part one describes the unit and how to interface with the
device. This section should be read by users, facilities staff, and anyone who requires a basic
understanding of how the device operates.

Part two describes the technical aspects of the product which include operation, configuration,

calibration, maintenance and troubleshooting. Part two should be read by personnel
programming or maintaining the unit. TSI recommends thoroughly reading this manual

before changing any software items.
NOTE: This operation and service manual assumes that the controller has been properly

installed. Refer to the Installation Instructions if there is any question as to whether the
controller has been installed properly.

Safety Information

This section gives instructions to promote safe and proper handling of Model FHM10 Fume Hood
Monitors and Model FHC50 Fume Hood Controllers.

There are no user-serviceable parts inside the instrument. Opening the instrument case will void
the warranty. Refer all service of the unit to a qualified technician.

Description of Caution Symbol

Access Code

Model FHM10 Fume Hood Monitors and FHC50 Fume Hood Controllers have an access code to
limit unauthorized access to the menu system. The access code can be turned on or off through
the ACCESS CODE menu item. When the units ship from TSI, they are configured with the
access code on. Refer to Appendix D, Access Codes, for instructions on entering the access
code. Entering the access code enables access to the menu system for a 15-minute period.

2

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3

Part One

User Basics

This section is designed to provide a brief but thorough overview of the product installed. These
few pages explain the purpose (The Instrument) and the operation (Useful user information,
Operator panel, Alarms) of the product. Technical product information is available in Part Two of
the manual.

The Instrument

The Model FHM10 Fume Hood Monitor is able to measure and report air flow in fume hoods and
other exhaust devices such as snorkels and canopies. The Model FHC50 Fume Hood Controller
adds the ability to control airflow to maintain safety and energy efficiency.

There are two main monitor and control strategies that can be used with the Model FHC50 Fume
Hood Controller:

Face Velocity

One of the key components of air flow in a fume hood is adequate face velocity, which is needed
to protect fume hood users. An adequate face velocity will help contain contaminants inside of
the fume hood.

A fume hood exhaust system produces a negative pressure differential between the fume hood’s
interior and the laboratory, causing air to be drawn into the hood. The speed of air entering the
fume hood is called the face velocity. The Model FHC50 Fume Hood Controller can be
configured to continuously monitor fume hood face velocity by measuring the air velocity across a
sensor mounted in the sidewall of the hood. The sensor and opening in the fume hood are driven
by the same pressure differential so the velocity across each is related.

As an alternative to this sidewall sensing methodology, the Model FHC50 can determine average
fume hood face velocity by measuring the fume hood exhaust flow and sash area. When
measuring face velocity in this fashion, the Model FHC50 must use a venturi valve with feedback
to control and measure the exhaust volume. A sash sensor then measures the vertical opening of
the fume hood sash. As an option, the Model FHC50 can use a sidewall sensor to monitor or trim
the face velocity when calculated from sash position and exhaust flow rate.

The Model FHC50 controller modulates the exhaust to maintain an adequate face velocity at all
times through the fume hood.

Exhaust Flow

Certain devices such as laminar flow benches, canopy hoods and snorkels need to exhaust a
certain amount of air to function properly. For these applications, the Model FHC50 can be
configured to measure and control the air flow to a constant volume using a venturi valve or a
flow station with damper.

User Basics

4

Useful User Information

The Model FHM10 Fume Hood Monitor
and Model FHC50 Fume Hood Controller
are easy to use. All the information you
need to know about face velocity and
flow rates is displayed on the Display
Interface Module (DIM). In addition, all
configuration, control, and calibration
programming is accessible using the soft
keys and menus. Specific details about
the Model FHC50 controller front panel
display and controls are described on the
following pages. The front panel, shown
in Figure 1 identifies the important
features: display, keys and lights.

LED Lights

Green Light

The green light (NORMAL) is on
when the face velocity and/or
exhaust flow is adequate. This light
indicates the fume hood is operating
safely. If a set point cannot be
maintained or an alarm limit has
been reached, the green light turns
off and the red alarm light turns on.

Figure 1

The controller has a green light (normal operation) and red alarm light (low and high alarms). The
green light is on when the face velocity and/or exhaust flow is adequate. The red alarm light
comes on when the face velocity and/or exhaust flow drops below a safe level, or exceeds a safe
level. The display provides additional information depending on the configuration of the unit.
Some of the available information includes continuously indicating the actual face velocity,
exhaust flow, alarms, and controller status.

Operator Panel

Yellow Light

The yellow light is on to indicate that the Model FHC50 controller is muted or in setback

mode. The LCD display will read “Setback” or “Mute” at the top of the screen to indicate the

meaning of the yellow light. Note that when in Setback mode, the Model FHC50 will also turn
on the Red or Green light.

Red Light

The red light is on to indicate an alarm or emergency status. If the red light flashes, then the
Model FHC50 is in emergency mode. If the red light is continually lit, then the Model FHC50
is in an alarm mode. The display screen will also indicate the type of alarm or an emergency
message.

Part One

5

WARNING

Pressing these keys will change how the unit functions. Please thoroughly review the
manual before using these keys or changing menu items.

NOTE: The unit can be programmed so that the User Soft Keys will not be displayed

during normal operating mode (see Software Programming section, menu
item DISPL SOFTKEYS).

MENU

Provides access to the menus when in the normal operating mode (see

Software Programming section).

RESET

Resets the alarm light, alarm contacts, and audible alarm when in a latched
or non-automatic reset mode. If an alarm is reset before alarm conditions
exited, the monitor or controller will reset the alarm but the alarm mode will be
re-entered after the ALARM DELAY.

Resets the emergency function after the emergency key has been pressed
(see EMERGENCY key).

Clears any displayed error messages.

SETBACK

The SETBACK soft key activates the setback or second control set point. In
setback mode, the controller controls at the setback set point, the display
indicates SETBACK, and the yellow light turns on.

NORMAL

The NORMAL soft key will appear if the unit has been placed into Setback
mode. If the NORMAL soft key is pressed, the controller returns to normal
control set point.

Display Screen

The LCD display is highly configurable and can display various critical information including
actual face velocity, exhaust flow rate, alarm status, menu options, and error messages. In
addition, the LCD display shows various soft key labels that enable user interaction and
programming the unit.

When programming the unit, the display will update soft keys and show menus, menu items, and
current value of the menu item, depending on the specific programming function being
performed.

User Soft Keys (Normal Operating Mode)

There are four soft keys on the front of the unit just below the LCD screen that can be used to
interact with the unit.

The list below contains soft keys that will appear at the display screen during normal operating
mode, depending on the state of the unit.

Quick Keys

There are two Quick Keys on the front of the unit just below the Soft Keys. The Quick-Keys
function as left and right arrows or to increase/decrease values.

User Basics

6

Operator Keys

MUTE key

The MUTE key silences an audible alarm. The alarm remains silent until the
MUTE TIMEOUT value has been reached or the unit returns to control set point.
Pressing the MUTE key twice will permanently mute the alarm.

EMERGENCY key

The EMERGENCY key puts the controller into emergency mode. The controller
maximizes the exhaust flow and face velocity (if applicable) by modulating the
damper or venturi valve to full open position.

The Model FHM10 monitor and FHC50 controller can be configured so the
audible alarm is silenced during emergency mode. See menu item

EMERGENCY_AUD.

There are two dedicated keys on the front of the unit that each provides a critical function.

NOTE You can program the unit so that the audible alarm cannot be muted

(see menu item MUTE_BUTTON).

Pressing the EMERGENCY key will cause ”EMERGENCY” to appear on the
display, the red alarm light to flash on and off, and the audible alarm to beep
intermittently. To return to control mode press the EMERGENCY key or the

RESET key.

USB Port

There is a USB port at the bottom of the case. This USB port can be used with TSI’s Fume Hood

Configuration Software.

Alarms

The Model FHC50 controller has visual (red light) and audible alarms to inform you of changing
fume hood conditions. The alarm levels (set points) are determined by facilities staff, which could
be Engineering, Industrial Hygiene, or a facilities group depending on how the safety staff is
organized.

The alarms, audible and visual, will activate whenever the preset alarm level is reached. The
alarms will activate if the face velocity is low or inadequate, high or too great, or when the
exhaust airflow is too low or too high (need optional flow device installed). When the fume hood is
operating safely, no alarms will sound.

Example: The low alarm is preset to activate when the face velocity falls below 60 ft/min. When

the face velocity drops below 60 ft/min, the audible and visual alarms activate. The
alarms turn off (when set to unlatched) when the unit returns to the safe range, which
is defined as 20 ft/min greater than alarm set point (80 ft/min).

Visual Alarm

The red light on the front of the unit indicates an alarm condition. The red light is on for all alarm
conditions, low alarms, high alarms, and emergency. The light is on continuously in a low or high
alarm condition, and flashes in an emergency condition.

Part One

7

The Model FHM10 monitor and FHC50 controller can be configured so the
audible alarm is silenced during emergency mode. See menu item

EMERGENCY_AUD.

Audible Alarm—EMERGENCY key

When the EMERGENCY key is pressed, the audible alarm beeps intermittently until the
EMERGENCY or RESET key is pressed terminating the emergency alarm. Pressing the MUTE

key will silence the emergency alarm, although the red LED will continue to flash (if enabled - see
menu item MUTE_KEY).

Audible Alarms—All Except Emergency

The audible alarm is continuously on in all low and high alarm conditions. The audible alarm can
be silenced by pressing the MUTE key (if enabled - see menu item MUTE_BUTTON).

If the audible alarm has been muted, the alarm is silenced for a configurable period of time (see
menu item MUTE TIMEOUT) or the measurement returns to the safe range. The safe range is 20
ft/min (50 cfm) above the low alarm set point and 20 ft/min (50 cfm) below the high alarm set
point.

The audible and visual alarms can be programmed to either automatically turn off when the unit
returns to the safe range or to stay in alarm until the RESET key is pressed (See menu item

ALARM_RESET).

Before Calling TSI

This manual should answer most questions and resolve most problems you may encounter. If
you need assistance or further explanation, contact your local TSI representative or TSI. TSI is
committed to providing high quality products backed by outstanding service.

Please have the following information available prior to contacting your authorized TSI
Manufacturer’s Representative or TSI:

- Model number of unit* FHC50-____ or FHM10-____

- Software revision level*

- Facility where unit is installed
* Can be determined by entering the SELF TEST item under the Diagnostics menu.
Due to the different Model FHM10 monitors and Model FHC50 controllers available, the above

information is needed to accurately answer your questions.
For the name of your local TSI representative or to talk to TSI service personnel, please call TSI

at [phone] (U.S. and Canada) or (001 651) 490-2811 (other countries).
Prior to shipping any components to TSI for service or repair, please utilize our convenient

Return Material Authorization (RMA) Form, which is available online at http://service.tsi.com.

User Basics

8

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Part One

9

The Fume Hood Controller is ready to use after being properly
installed and calibrated. The calibration procedure should take
less than 15 minutes. Figure 2 shows the Digital Interface Module
(DIM) which is programmed with a default configuration that can
be easily modified to fit your application.

The technical section is separated into six parts that cover all
aspects of the unit. Each section is written as independently as
possible to minimize flipping back and forth through the manual
for an answer.

The Software Programming section explains the programming
keys on the DIM. In addition, the programming sequence is
described, which is the same regardless of the menu item being
changed. At the end of this section is an example of how to
program the DIM.

The Hardware Configurations section covers the different ways
the DIM can be configured to accommodate the hardware and
sequence of operation that is required. This section explains how
to compare the installed hardware to the necessary settings that
are needed.

Figure 2

Part Two

Technical Section

The Menu and Menu Items section lists all of the software items available to program and
change. The items are grouped by menu which means all set points are in one menu, control
signal items in another, etc. The menu items and all related information is provided including;
programming name, description of menu item, range of programmable values, and how the unit
shipped from the factory (default value).

The Calibration section describes the required procedure to calibrate the controller. This section

explains how to compare the controller’s velocity reading to a portable thermal anemometer and

then adjust the zero and span to establish an accurate calibration. This section also describes
how to zero a TSI flow station transducer (if installed).

The Maintenance and Repair Part section covers all routine maintenance of equipment, along
with a list of repair parts.

The Troubleshooting section is split into two areas: mechanical operation of the unit and system
performance. Many external variables will affect how the unit functions so it is critical to first
determine if the system is having mechanical problems—i.e., no display on unit, alarms do not
function, damper does not modulate, etc. If no mechanical problems exist, look for performance
problems (i.e., does not seem to read correctly, display fluctuates, etc.). The first step is to
determine that the system is mechanically operating correctly, followed by modifying the
configuration to eliminate the performance problems.

Technical Section

10

Software Programming

Programming Keys

The four vertical programming soft
keys (refer to Figure 3) are used to
program or configure the unit to fit your
particular application. Programming the
instrument will change how the unit
functions, so thoroughly review the
menu items to be changed.

Figure 3

ESC

The ESC soft key is used to escape from the current menu or menu item, and will also
cancel any change that is currently being made to an item value.

/

The / soft keys are used to scroll through the menus, menu items, and through the
range of item values that can be selected. Depending on the item type the values may
be numerical, specific properties (on/off), or a list of options.

NOTE: When programming a numerical menu item, continuously pressing the arrow

key will scroll through the values faster than if arrow key is pressed and
released.



The  (ENTER) soft key performs three functions.

1. Provides access to specific menus and submenus.

2. Provides access to menu items.

3. Saves data.

Programming the Model FHC50 controller is quick and easy if the programming keys are
understood, and the proper keystroke procedure is followed. The programming keys are defined
first, followed by the required keystroke procedure. At the end of this section is a programming
example.

NOTE: It is important to note that the unit is always operating (except when checking the

CONTROL OUTPUT) when programming. When a menu item value is changed, the new

value takes effect immediately after saving the change, not when the unit returns to
normal operating mode.

This section covers programming the instrument through the keypad and display. If
programming through network communications (see Appendix B), use the host computer’s
procedure. The changes take place immediately upon saving data in the instrument.

Menu Soft Keys

The list below contains soft keys that will appear while in the menu structures.

Part Two

11

Standard Data Entry Method

5a. Press the  (ENTER) soft key to access

chosen menu item. The top line of
display shows menu item selected, and
below that shows current menu item

value. Use the / soft keys to change
menu item value.

Quick Data Entry Method

5b. With the desired menu item highlighted,

use the quick adjustment keys to change
menu item value.

6a. Save the new value by pressing the 

(ENTER) soft key (pressing the ESC soft

key will exit out of menu item without
saving data). The display will
automatically return to the current menu.

6b. Save the new value by pressing the 

(ENTER) soft key OR by using the /

soft keys to highlight a different menu
item (pressing the ESC soft key will exit
out of menu item without saving data).

Quick Keys

There are two dedicated adjustment keys on the front of the unit (refer to Figure 3) that become
active when accessing a menu item. These keys change choices of a menu item while that item
is highlighted on the display. The left adjustment key will decrease the value of an item, and the
right adjustment key will increase the value of an item. If there are no choices available for a
particular menu item, or if that menu item is for reference only, the adjustment keys will have no
effect.

The item data will be automatically saved when either of the / soft keys are used to highlight
a different menu item, or when the  (ENTER) soft key is pressed. Pressing the ESC soft key

while the menu item is still highlighted will discard changes and restore the item to its last saved
value.

NOTE: When programming a numerical menu item, continuously pressing a quick adjustment

key will scroll through the values faster than if they key is repeatedly pressed and
released.

Keystroke Procedure

The keystroke operation is consistent for all menus. The keystroke sequence is the same
regardless of the menu item being changed.

1. Press the MENU soft key from the normal operating screen to access the main menu.

2. Use the / soft keys to scroll through the menu choices until the item you want to

access is highlighted.

3. Press the  (ENTER) soft key to access chosen menu.

4. The menu selected is now displayed at the top of the display, followed by a list of available

menu items. Use the / soft keys to scroll through the menu items. Scroll through the
menu items until desired item is highlighted.

7. Press the ESC soft key to exit current menu and return to main menu.

8. Press the ESC soft key again to return to normal instrument operation.
If more than one item is to be changed, skip steps 7 and 8 until all changes are complete. If more

items in the same menu are to be changed, scroll to them after saving the data (step 6a or 6b). If
other menus need to be accessed, press the MENU key once to access list of menus (the
instrument is now at step 2 of the keystroke sequence).

Technical Section

12

Programming Example

 Unit is in normal operation.

0 ft/min

MENU

SETBACK

 Press the MENU key to gain access to the

menus.

The first menu choices are displayed.

MENU

ESC

Configure

Setpoints

Interface
Calibration
Control
Diagnostics

 Press the  and keys to access the SETPOINTS menu.

 Press the  soft key until Lo Vel Alarm

is highlighted.

SETPOINTS

ESC

100 ft/min

60 ft/min

25%

100%

OFF

Setpoint

Setback

Min Control Pos
Max Control Pos

Lo Vel Alarm

---- ----

Standard Data Entry Method

Quick Data Entry Method



Press the key to access the
Lo Vel Alarm screen.

LO VEL ALARM

ESC

60 ft/min

Press the Quick-Adjust keys to change
the alarm set point. Then press the  or

 soft key to save the change.

SETPOINTS

ESC

100 ft/min

60 ft/min

25%

100%

OFF

Setpoint

Setback

Min Control Pos
Max Control Pos

Lo Vel Alarm

---- ----



Press the / soft keys to change the alarm set point to 60 fpm, then press the

 key to save the new set point.

The following example demonstrates the keystroke sequence. In this example the low alarm set
point will be changed from 80 ft/min to 60 ft/min.

Part Two

13

SETTING

NORMAL &
SETBACK
CONTROL
TYPES

FACE
VELOCITY
METHOD

FLOW
METHOD

PARAMETERS
DISPLAYED

ANALOG
OUTPUT

INPUT 1

1) SIDEWALL
ONLY

Face Velocity

Sidewall
Sensor

N/A

Velocity

Velocity

Night
Setback**

2) SIDEWALL
PRESSFLOW

Face Velocity
With Flow
Limits

Sidewall
Sensor

Pressure­Based Flow
Station

Velocity

No
Change*

Night
Setback**

3) SIDEWALL
LINEARFLOW

Face Velocity
With Flow
Limits

Sidewall
Sensor

Linear Flow
Station

Velocity

No
Change*

Night
Setback**

4) SIDEWALL
LOMVENTURI

Face Velocity
With Flow
Limits

Sidewall
Sensor

Venturi
Valve With
LOM
Feedback

Velocity

No
Change*

Night
Setback**

5) SIDEWALL
6PTVENTURI

Face Velocity
With Flow
Limits

Sidewall
Sensor

Venturi
Valve (No
Feedback)

Velocity

No
Change*

Night
Setback**

6) FLOW
PRESSFLOW

Flow

N/A

Pressure­Based Flow
Station

Flow

Flow Rate

Night
Setback**

7) FLOW
LINEARFLOW

Flow

N/A

Linear Flow
Station

Flow

Flow Rate

Night
Setback**

8) FLOW
LOMVENTURI

Flow

N/A

Venturi
Valve With
LOM
Feedback

Flow

Flow Rate

Night
Setback**

Hardware Configurations

The Model FHM10 Fume Hood Monitor can be field-configured to monitor face velocity or flow
rates, while the Model FHC50 Fume Hood Controller can be field-configured to control face
velocity or flow rates. These models feature a configuration wizard to easily select the desired
monitor or controller configuration.

The following tables will assist in determining which configuration will need to be programmed
into the controller for proper operation. You can also use the tables as a check to ensure that the
monitor or controller has been properly configured after changing default settings from the
configuration wizard.

Please note that in some applications, there may be a flow sensing device present at the fume
hood exhaust (flow station, venturi valve linear feedback, etc.), but which is not used by the fume
hood controller. The flow sensing information may be intended only to be received by a room
controller for flow tracking purposes. This will not affect the operation of the fume hood controller
provided it is configured correctly.

Model FHC50 Controller Modes

Technical Section

14

SETTING

NORMAL &
SETBACK
CONTROL
TYPES

FACE
VELOCITY
METHOD

FLOW
METHOD

PARAMETERS
DISPLAYED

ANALOG
OUTPUT

INPUT 1

9) FLOW
6PTVENTURI

Flow

N/A

Venturi
Valve (No
Feedback)

Flow

Flow Rate

Night
Setback**

10) SASHPOS
LOMVENTURI

Face Velocity
With Flow
Limits

Sash­Position

Venturi
Valve With
LOM
Feedback

Velocity

No
Change*

Vertical
Sash
Sensor

11) N/A

N/A

N/A

N/A

N/A

N/A

N/A

12) SIDEWALL
SASHCALC­FLOW

Face Velocity
With Flow
Limits

Sidewall
Sensor

Calculated
from
measured
Sash
Opening
and
Sidewall
Sensor

Velocity

No
Change*

Vertical
Sash
Sensor

SETTING

SIDEWALL
SENSOR

FLOW
METHOD

PARAMETERS
DISPLAYED

ANALOG
OUTPUT

INPUT 1

1) SIDEWALL
VELMONITOR

Enabled

N/A

Velocity

Velocity

Night
Setback**

2) PRESSFLOW
MONITOR

Disabled

Pressure­Based Flow
Station

Flow

Flow Rate

Night
Setback**

3) LINEARFLOW
MONITOR

Disabled

Linear Flow
Station

Flow

Flow Rate

Night
Setback**

4) LOMVENTURI
FLOWMONITOR

Disabled

Venturi
Valve With
LOM
Feedback

Flow

Flow Rate

Night
Setback**

Model FHM10 Fume Hood Monitor Modes

* Analog Output is reset if previous setting would now be invalid. Otherwise, Analog Output is not changed.
** Input 1 is changed to Night Setback only if it was previously set to Vertical Sash Sensor.

Part Two

15

CONFIGURE
CONFIG WIZARD

VEL SENSOR
FLOW DEVICE
DISPL SOFTKEYS
DISPLAY MEAS
DISPLAY AVG
DISPLAY UNITS
ALARM RESET
EMERGENCY AUD
MUTE BUTTON
MUTE TIMEOUT
ALARM DELAY
ANALOG OUT TYPE
ANALOG OUT SIG
ANALOG OUT F.S.
RELAYS OUT
RELAY SEL B
INPUT SEL 1
INPUT SEL 2
INPUT SEL 3
NUMBER FORMAT
CONTRAST
ACCESS CODE

SETPOINTS
LO VEL ALARM

HI VEL ALARM
LO FLOW ALARM
HI FLOW ALARM
SETB LOVEL ALARM
SETB HIVEL ALARM
SETB LOFLO ALARM
SETB HIFLO ALARM

CALIBRATION

VEL SENSOR ZERO
VEL SENSOR SPAN
CALIBRATE FLOW

DIAGNOSTICS**

VEL SENSOR INPUT
FLOW STATION INPUT
SHOW FLOW
ANALOG OUT
ALARM RELAY A
ALARM RELAY B
IN1 SASH CONTACT
IN2 EMERG PURGE
IN3 NIGHT SETBACK
SELF TEST
RESET SETTINGS
RESET ALL CALIBS

INTERFACE
NET PROTOCOL

NETWORK SETTINGS*

Menu and Menu Items

The Model FHM10 monitor and Model FHC50 controller are very versatile devices which can be
configured to meet your specific application. This section lists all of the menu items available to
program and change (except diagnostics menu). Changing items is accomplished by using the
keypad or through communications with the Building Automation System. If you are unfamiliar
with the keystroke procedure please see Software Programming section for a detailed
explanation. This section provides the following information:

 Complete list of menus and all menu items.
 Gives the menu or programming name.
 Defines each menu item’s function; what it does, how it does it, etc.
 Gives the range of values that can be programmed.
 Gives default item value (how it shipped from factory).

The menus covered in this section are divided into groups of related items to ease programming.
As an example all set points are in one menu, alarm information in another, etc. The manual
follows the menus as programmed in the controller. The menu items are always grouped by
menu and then listed in menu item order, not alphabetical order. Figure 4 shows the
Model FHM10 monitor menu items, while Figure 5 shows the Model FHC50 controller menu
items.

* Items in NETWORK SETTINGS submenu depend on NET PROTOCOL setting. See

NETWORK SETTINGS item description for details.

** Menu items located in Troubleshooting section.

Technical Section

Figure 4. Menu Items – Model FHM10 Monitor

16

CONFIGURE
CONFIG WIZARD

NORM CTRL MODE
SETB CTRL MODE
VEL SENSOR
FLOW DEVICE
DISPL SOFTKEYS
DISPLAY MEAS
DISPLAY AVG
DISPLAY UNITS
ALARM RESET
EMERGENCY AUD
MUTE BUTTON
MUTE TIMEOUT
ALARM DELAY
ANALOG OUT TYPE
ANALOG OUT SIG
ANALOG OUT F.S.
RELAYS OUT
RELAY SEL A
RELAY SEL B
INPUT SEL 1
INPUT SEL 2
INPUT SEL 3
NUMBER FORMAT
CONTRAST
SPECIALS MENU
ACCESS CODE

SETPOINTS
SETPOINT

SETBACK
SETB CNTL POS
MIN CONTROL POS
MAX CONTROL POS
MIN FLOW
MAX FLOW
LO VEL ALARM
HI VEL ALARM
LO FLOW ALARM
HI FLOW ALARM
SETB LOVEL ALARM
SETB HIVEL ALARM
SETB LOFLO ALARM
SETB HIFLO ALARM
HI SASH POS ALARM
DAMPER ALARM

INTERFACE
NET PROTOCOL

NETWORK
SETTINGS**

CALIBRATION

VEL SENSOR ZERO
VEL SENSOR SPAN
CALIBRATE FLOW
BALANCE MODE
SASH CAL CLOSED
SASH CAL OPEN
SASH AREA OPEN
SASH AREA CLOSED

BALANCE MODE*
DESIRED FLOW
FLOW KFACTOR
UNCORRECTED
FLOW
KF USED
FLOW * KF

CONTROL

SENSITIVITY
SPEED
CONTROL SIG
KC VALUE
TI VALUE

DIAGNOSTICS***

CONTROL OUT
VEL SENSOR INPUT
SHOW FACE VEL
FLOW STATION ANALOG INPUT
SHOW FLOW
ANALOG OUT
ALARM RELAY A
ALARM RELAY B
IN1 SASH CONTACT****
SHOW SASH%OPEN
SHOW SASH AREA
IN2 EMERG PURGE****
IN3 NIGHT SETBACK****
SELF TEST
RESET SETTINGS
RESET ALL CALIBS

* BALANCE FLOW submenu only appears if flow sensor is enabled (FLOW DEVICE not set to

NONE).

** Items in NETWORK SETTINGS submenu depend on NET PROTOCOL setting. See

NETWORK SETTINGS item description for details.

*** Menu items located in Troubleshooting section.
**** Menu item name depends on INPUT SEL 1, INPUT SEL 2 and INPUT SEL 3 in

CONFIGURE menu.

Part Two

Figure 5: Menu Items – Model FHC50 Controller

Technical Section 17

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

CONFIGURATION
WIZARD

FHM10 and FHC50

CONFIG
WIZARD

The CONFIG WIZARD item is used to select the desired
sequence of operations. Using the CONFIG WIZARD will also
configure inputs and outputs for the selected sequence of
operations. Refer to the Hardware Configurations section to see
the inputs and outputs.

NOTE: Use the CONFIG WIZARD to change the sequence of

operations. Some settings can only be changed
through the CONFIG WIZARD.

FHC50 Controller:

1) Sidewall only

2) Sidewall
PressFlow

3) Sidewall
LinearFlow

4) Sidewall
LOMVenturi

5) Sidewall
6ptVenturi

6) Flow PressFlow

7) Flow LinearFlow

8) Flow LOMVenturi

9) Flow 6ptVenturi

10) SashPos
LOMVenturi

12) Sidewall
SashCalcFlow

FHM10 Monitor:

1) Sidewall
VelMonitor

2) PressFlow
Monitor

3) LinearFlow
Monitor

4) LOMVenturi
FlowMonitor

FHC50
Controller:

1) Sidewall only

FHM10 Monitor:

1) Sidewall

VelMonitor

18 Part Two

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

NORMAL
CONTROL MODE

FHC50 Only

NORM CTRL
MODE

The NORM CTRL MODE item selects the measurement on
which the control function is based during NORMAL (Occupied)
Mode.

If this item is set to:
VelSidewall The controller will control face velocity using a

sidewall sensor.

VelSashPos The controller will control face velocity using a

sash sensor and venturi valve with LOM
feedback.

VelSide+Sash The controller will control face velocity using

both the sash sensor with LOM feedback and a
sidewall sensor.

Flow The controller will control flow using the flow

device (see menu item FLOW DEVICE).

VelSidewall

VelSashPos

VelSide+Sash

Flow

VelSideWall

Technical Section 19

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

SETBACK
CONTROL MODE

FHC50 Only

SETB CTRL
MODE

The SETB CTRL MODE item selects the measurement on
which the control function is based during SETBACK
(Unoccupied) Mode.

If this item is set to:
VelSidewall The controller will control face velocity using a

sidewall sensor.

VelSashPos The controller will control face velocity using a

sash sensor and venturi valve with LOM
feedback.

VelSide+Sash The controller will control face velocity using

both the sash sensor with LOM feedback and a
sidewall sensor.

Flow The controller will control flow using the flow

device (see menu item FLOW DEVICE).

FixedPos The controller will hold the damper or venturi

valve at a fixed percentage at all times during
SETBACK Mode, while ignoring the measured
face velocity or flow for control purposes. All
SETBACK-related alarms are still active with
this configuration, unless set to OFF.

NOTE: To shutdown a fume hood with the Model FHC50

controller, set the SETB CTRL MODE item to
FixedPos and the SETBACK POS item to 0%.

VelSidewall

VelSashPos

VelSide+Sash

Flow

FixedPos

VelSideWall

VELOCITY
SENSOR

FHM10 and FHC50

VEL SENSOR

The VEL SENSOR item shows if the velocity sensor input is
enabled. If this item shows Enabled, then the controller will look
for and use an installed sidewall sensor. If this item shows
Disabled, the controller will not look for or use an installed
sidewall sensor.

Enabled

Or

Disabled

None

(Read-only value)

20 Part Two

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE

FHM10 and FHC50

FLOW
DEVICE

The FLOW DEVICE item shows the type of air flow device being
used for flow based measurements and control. Choose:

None No flow device installed, or there is to be no flow

information used by the controller.

Lin Flo Sta When a linear output flow station, typically

thermal anemometer based, is installed.

Press Flo Sta When a TSI flow station with pressure

transducer is installed.

LOM Venturi When a TSI venturi valve with a Linear Output

Module with Linear Feedback is installed.

6pt Venturi When a standard TSI venturi valve (without

Linear Output Module) is installed.

Calculated When both a sidewall velocity sensor and a

sash sensor are installed, and the flow rate is to
be calculated using the data obtained from the
two sensors (face velocity X sash open area =
flow rate)

FHC50 Controller:

None

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi
Calculated

FHM10 Monitor:

None

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi

None

(Read-only value)

DISPLAY
SOFTKEYS

FHM10 and FHC50

DISPL
SOFTKEYS

The DISPL SOFTKEYS item selects if the menu and
programming soft keys are to be displayed during normal
operating mode.

NOTE: Press left and right quick-keys and right-most soft key

simultaneously to gain access to menu system if
DISPL SOFTKEYS is set to OFF.

ON

OFF

ON

Technical Section 21

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

DISPLAY
MEASUREMENT

FHM10 and FHC50

DISPLAY
MEAS

The DISPLAY MEAS item selects which measurements will be
presented on the display during normal operating mode. Use the

DISPLAY UNITS item to choose the units of measure:
Vel Displays only the current face velocity.
Vel, Flow Displays both the current face velocity and the

current flow.

Flow Displays only the current flow.
None Does not display face velocity or flow during normal

operating mode.

Vel

Vel, Flow

Flow
None

Vel

DISPLAY
AVERAGE

FHM10 and FHC50

DISPLAY
AVG

The DISPLAY AVG item selects the display’s running average
period. The display-averaging period is the length of time the
face velocity has been averaged before being displayed. The
DISPLAY AVG item value may be set between 0.5 and 40
seconds. The higher the averaging value, the more stable the
display.

0.5, 1, 2, 3, 5, 10, 20,

or 40 seconds

5 seconds

DISPLAY UNITS

FHM10 and FHC50

DISPLAY
UNITS

The DISPLAY UNITS item selects the unit of measure that the
controller displays all velocity and flow related menu items: set
points, alarms, calibration, etc.

ft/min, cfm

m/s, m3/h

m/s, l/s

ft/min, cfm

ALARM RESET

FHM10 and FHC50

ALARM
RESET

The ALARM RESET item selects how the alarms terminate
after the unit returns to control set point. UNLATCHED (alarm
follow) automatically resets the alarm when the face velocity is
20 ft/min (50 cfm for flow alarms) greater than the low alarm set
point, or 20 ft/min (50 cfm for flow alarms) below the high alarm
set point. LATCHED requires the staff to press the RESET key
to clear alarms. The ALARM RESET affects the audible alarm,
visual alarm, and relay output, which means all are latched or
unlatched.

LATCHED

or

UNLATCHED

UNLATCHED

22 Part Two

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

EMERGENCY
AUDIBLE ALARM

FHM10 and FHC50

EMERGENCY
AUD

The EMERGENCY AUD menu item determines of the audible
alarm sounds when the controller enters emergency mode. If set
to ON, the audible alarm will sound intermittently to indicate an
emergency. If set to OFF, the audible alarm will not sound in
emergency mode.

NOTE: The EMERGENCY AUD item does not affect

messages on the display or operation of the red LED.

ON

or

OFF

ON

MUTE BUTTON

FHM10 and FHC50

MUTE
BUTTON

The MUTE BUTTON item enables the mute button on the front
of the controller. Select ON if the Audible Alarm can be muted
from the keypad. Select OFF if the Audible Alarm cannot be
muted.

ON

OFF

ON

MUTE TIMEOUT

FHM10 and FHC50

MUTE
TIMEOUT

The MUTE TIMEOUT item sets the length of time the audible
alarm will be silenced if the mute button is pressed (MUTE
BUTTON must be set to ON). The MUTE TIMEOUT can be set
from 1 to 60 minutes or Permanent. If Permanent is selected, the
audible alarm will not be activated during the current alarm, but
the audible alarm will reset when the alarm clears.

1 to 60 Minutes

Permanent

1 Minute

ALARM DELAY

FHM10 and FHC50

ALARM
DELAY

The ALARM DELAY item sets the period of time the face
velocity (flow) must be above the high alarm set point or below
the low alarm set point before the controller enters alarm mode.
Use the ALARM DELAY function to avoid momentary, nuisance
alarms.

5 to 120 seconds

5 seconds

ANALOG OUTPUT
TYPE

FHM10 and FHC50

ANALOG
OUT TYPE

The ANALOG OUT TYPE item selects the measurement that
the ANALOG OUTPUT SIGNAL will represent.

FHC50 Controller:

Velocity

Flow rate

%Sash Open

FHM10 Monitor:

Velocity

Flow rate

Velocity

ANALOG OUTPUT
SIGNAL

FHM10 and FHC50

ANALOG
OUT SIG

The ANALOG OUT SIG item selects the type of analog Velocity,
Flow, or %Sash Open signal output (not control output signal).
See menu item ANALOG OUT TYPE.

0 to 10 VDC or

4 to 20 mA

0 to 10 VDC

Technical Section 23

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

ANALOG OUTPUT
FULL SCALE

FHM10 and FHC50

ANALOG
OUT F.S.

The ANALOG OUT F.S. item selects the full scale range that the

ANALOG OUTPUT SIGNAL will represent. If ANALOG OUT
TYPE is set to velocity, the ANALOG OUT F.S. item can be set

between 0 to 1000 ft/min. If ANALOG OUT TYPE is set to flow
rate, the ANALOG OUT F.S. item can be set between
0 to 10,000 cfm. See menu item ANALOG OUT TYPE. If

ANALOG OUT TYPE is set to % Sash Open, the ANALOG
OUT F.S is set to 100%.

0 to 1000 ft/min

or

0 to 10000 cfm

or

100% to 105%

1000 ft/min

RELAY OUTPUT
DIRECTION

FHM10 and FHC50

RELAYS OUT

The RELAYS OUT item configures the state of the alarm relays.
Select OK=OPEN for normally open (N.O.) relays that close
during alarm conditions. Select OK=CLOSED for normally closed
(N.C.) relays that open during alarm conditions.

NOTE: Relays will always close during power loss conditions.

OK = OPEN

or

OK = CLOSED

OK = OPEN

RELAY OUTPUT 1
SELECT

FHM10 and FHC50

RELAY SEL A

The RELAY SEL A item shows the desired alarm output to be
used with Relay Contact Output 1.

Low Alarm

None

(Read-only value)

RELAY OUTPUT 2
SELECT

FHM10 and FHC50

RELAY SEL B

The RELAY SEL B item selects the desired alarm output to be
used with Relay Contact Output 2. Relay B can be set to toggle
the relay when the unit is in high alarm, high sash alarm, setback
mode, or damper alarm setpoint.

FHM10: High Alarm,

Setback, Sash Open

FHC50: High Alarm,
High Sash, Setback,

Damper Open

High Alarm

24 Part Two

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

INPUT SELECT 1
INPUT SELECT 2
INPUT SELECT 3

FHM10 and FHC50

INPUT SEL 1
INPUT SEL 2
INPUT SEL 3

The INPUT SEL # item selects the desired input type to be used
with the corresponding input terminals.

Night Setb Enables the input to be used with a

switch/contact closure to enable night setback
mode.

Emerg Purge Enables the input to be used with a

switch/contact closure to enable emergency
mode.

Sash Contact Enables the input to be used with a

switch/contact closure to monitor the fume hood
sash height.

Sash Pos V Enables the input to be used with a TSI Vertical

Sash Position sensor. This option applies to
INPUT SEL 1 Only. The Sash Pos V option is
only available on the FHC50.

Night Setb
Emerg Purge
Sash Contact

Sash Pos V

(INPUT 1 Only)

INPUT SEL 1:

Night Setb

INPUT SEL 2:

Night Setb

INPUT SEL 3:

Emerg Purge

NUMBER
FORMAT

FHM10 and FHC50

NUMBER
FORMAT

The NUMBER FORMAT menu item selects the way that
numbers are displayed.

XX,XXX.YY
XX.XXX,YY

XX,XXX.YY

DISPLAY
CONTRAST

FHM10 and FHC50

CONTRAST

The CONTRAST menu item changes the level of contrast on the
display screen. Decreasing this value will decrease the contrast,
and increasing this value will increase the contrast.

1 to 10

5

SPECIALS MENU
FHC50 Only

SPECIALS
MENU

The SPECIALS MENU item is used to set the Model FHC50
controller for certain custom configuration. Access to the
SPECIALS MENU item is restricted with a password. Contact
TSI for information about these configurations.

N/A

N/A

Technical Section 25

CONFIGURE MENU

MENU ITEM

Monitor/

Controller

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

ACCESS CODE

FHM10 and FHC50

ACCESS
CODE

The ACCESS CODE item selects whether an access code (pass
code) is required to enter the menu items. The ACCESS CODE
item prevents unauthorized access to a menu. If the ACCESS
CODE is OFF, no code is required to enter the menu screens.
Conversely, if the ACCESS CODE is ON, a code is required
before the menu screens can be entered.

NOTE: Entering the code when the ACCESS CODE item is

ON disables the ACCESS CODE for a period of 15

minutes.

ON or OFF

ON

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

CONTROL
SETPOINT

FHC50 Only

SETPOINT

The SETPOINT item sets the control set point. The control set
point can be for either face velocity or flow control, depending on
the setting of menu item NORMAL CONTROL MODE. The
FHC50 controller will maintain this set point when normal
operating conditions exist.

If NORMAL CONTROL MODE = VelSideWall, VELSashPos or
VelSide+Sash, enter a face velocity set point between 60 to
980 ft/min.

If NORMAL CONTROL MODE = Flow, enter a value between 0
and 10,000 cfm.

60 to 980 ft/min

or

0 to 10000 cfm

100 ft/min

or

0 cfm

26 Part Two

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

CONTROL
SETBACK
SETPOINT

FHC50 Only

SETBACK

The SETBACK item sets an alternate control set point, typically
used when the laboratory is unoccupied. The SETBACK control
set point can be for either face velocity or flow control,
depending on the setting of menu item SETBACK CONTROL
MODE. The FHC50 controller will maintain this set point when
normal operating conditions exist.

If SETBACK CONTROL MODE = VelSideWall, VELSashPos or
VelSide+Sash, enter a value between 60 to 980 ft/min.

If SETBACK CONTROL MODE = Flow, enter a value between 0
and 10,000 cfm.

A SETBACK condition is initiated when the SETBACK key has
been pressed, the SETBACK contact input has been closed, or
a command is received through network communications.

WARNING: The Model FHC50 may not maintain the fume

hood’s containment at low SETBACK face
velocities.

0 to 980 ft/min

or

0 to 10000 cfm

100 ft/min

or

0 cfm

SETBACK
CONTROL
POSITION

FHC50 Only

SETBACK
CNTRL POS

The SETBACK CNTRL POS item is used to program a setback
mode fixed damper or venturi valve position. The menu item
SETBACK CONTROL MODE must be set to FIXED POS to
enable the SETBACK CNTRL POS menu item. During
SETBACK, the controller will set the control output to the value
programmed for SETBACK CNTRL POS.

NOTE: To shutdown a fume hood with the Model FHC50

controller, set the SETB CTRL MODE item to Fixed
Position and the SETBACK CNTRL POS item to 0%.

WARNING: The Model FHC50 may not maintain the fume

hood’s average face velocity or flow at the setback

set point item value when a SETBACK CNTRL
POS has been programmed. The average face

velocity or exhaust flow may fall below the setback
alarm value; this could result in a setback velocity
or flow alarm condition.

0 to 100%

100%

Technical Section 27

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

MINIMUM
DAMPER
POSITION
SETPOINT

FHC50 Only

MIN
CONTROL
POS

The MIN CONTROL POS item is used to set the minimum
damper position. The minimum damper position allows the
setting of a minimum airflow through the fume hood. When the
fume hood exhaust volume needed to maintain the set face
velocity is less than the set minimum damper position (typically
sash closed), the damper maintains the minimum damper
position. Closing the sash further will result in an increase in the
face velocity above the control set point which may cause a
high alarm.

0 to 100%

0% OPEN

MAXIMUM
DAMPER
POSITION
SETPOINT

FHC50 Only

MAX
CONTROL
POS

The MAX CONTROL POS item is used to set the maximum
damper position. The maximum damper position allows the
setting of a maximum airflow through the fume hood. When the
fume hood exhaust volume needed to maintain the set face
velocity is greater than the set maximum damper position
(typically sash open), the damper maintains the maximum
damper position. Opening the sash further will result in a
decrease in face velocity, which may cause a low alarm
indicating an unsafe hood condition exists.

0 to 100%

100% OPEN

MINIMUM FLOW
SETPOINT

FHC50 Only

MIN FLOW

The MIN FLOW item sets the minimum flow set point when the
NORMAL CONTROL MODE is set to VelSidewall, VelSashPos
or VelSide+Sash. When the fume hood exhaust reaches the
minimum flow set point, as the fume hood sash is lowered, the
controller will modulate the hood exhaust to maintain this
minimum flow.

WARNING: The Model FHC50 may not maintain the fume

hoods average face velocity at the SETPOINT item
value when a MINIMUM FLOW has been
programmed. The average face velocity may
exceed the SETPOINT item value, resulting in a

HIGH ALARM condition.

NOTE: The MINIMUM FLOW set point must be 50 cfm less

than the MAXIMUM FLOW set point.

OFF, 0 to 10,000 cfm

OFF

28 Part Two

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

MAXIMUM FLOW
SETPOINT

FHC50 Only

MAX FLOW

The MAX FLOW item sets the maximum flow set point when the
NORMAL CONTROL MODE is set to VelSidewall, VelSashPos
or VelSide+Sash. When the fume hood exhaust reaches the
maximum flow set point, as the fume hood sash is raised, the
controller will modulate the hood exhaust damper to maintain
this maximum flow.

OFF, 0 to 10,000 cfm

OFF

WARNING: The Model FHC50 may not maintain the fume

hoods average face velocity at the SETPOINT item
value when a MAX FLOW has been programmed.
The average face velocity may fall below the
SETPOINT item value, resulting in a LOW ALARM
condition.

NOTE: The MAX FLOW set point must be 50 cfm greater than

the MIN FLOW set point.

LOW VELOCITY
ALARM SETPOINT

FHM10 and FHC50

LOW VEL
ALARM

The LOW VEL ALARM item sets the face velocity low alarm set
point during Normal mode. A low alarm condition is defined as
when the face velocity is less than the low alarm set point during
Normal mode.

NOTE: The LOW VEL ALARM must be at least 20 ft/min less

than the SETPOINT.

OFF, 5 to 980 ft/min

OFF

HIGH VELOCITY
ALARM SETPOINT

FHM10 and FHC50

HIGH VEL
ALARM

The HIGH VEL ALARM item sets the face velocity high alarm
set point during Normal mode. A high alarm condition is defined
as when the face velocity exceeds the high alarm set point
during Normal mode.

NOTE: The HIGH VEL ALARM must be at least 20 ft/min

greater than the SETPOINT.

OFF, 80 to
1000 ft/min

OFF

LOW FLOW
ALARM SETPOINT

FHM10 and FHC50

LO FLOW
ALARM

The LO FLOW ALARM item sets the low flow alarm set point
during Normal mode. A low flow alarm condition is defined as
when the exhaust flow is less than the low flow alarm set point
during Normal mode.

NOTE: The LO FLOW ALARM must be at least 50 cfm less

than the SETPOINT.

OFF, 0 to 10000 cfm

OFF

Technical Section 29

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

HIGH FLOW
ALARM SETPOINT

FHM10 and FHC50

HI FLOW
ALARM

The HI FLOW ALARM item sets the high flow alarm set point
during Normal mode. A high flow alarm condition is defined as
when the exhaust flow is greater than the high flow alarm set
point during Normal mode.

NOTE: The HI FLOW ALARM must be at least 50 cfm greater

than the SETPOINT.

OFF, 0 to 10000 cfm

OFF

SETBACK LOW
VELOCITY ALARM
SETPOINT

FHM10 and FHC50

SETB LOVEL
ALARM

The SETB LOVEL ALARM item sets the face velocity low alarm
set point during Setback mode. A setback low velocity alarm
condition is defined as when the face velocity is less than the
setback low velocity alarm set point during Setback mode.

NOTE: The SETB LOVEL ALARM must be at least 20 ft/min

less than the SETBACK set point.

OFF, 5 to 980 ft/min

OFF

SETBACK HIGH
VELOCITY ALARM
SETPOINT

FHM10 and FHC50

SETB HIVEL
ALARM

The SETB HIVEL ALARM item sets the face velocity high alarm
set point during Setback mode. A setback high velocity alarm
condition is defined as when the face velocity exceeds the
setback high velocity alarm set point during Setback mode.

NOTE: The SETB HIVEL ALARM must be at least 20 ft/min

greater than the SETBACK set point.

OFF, 80 to
1000 ft/min

OFF

SETBACK LOW
FLOW ALARM
SETPOINT

FHM10 and FHC50

SETB LOFLO
ALARM

The SETB LOFLO ALARM item sets the low flow alarm set
point during SETBACK. A setback low flow alarm condition is
defined as when the exhaust flow is less than the setback low
flow alarm set point during SETBACK.

NOTE: The SETB LO FLOW ALARM must be at least 50 cfm

less than the SETPOINT.

OFF, 0 to 10000 cfm

OFF

SETBACK HIGH
FLOW ALARM
SETPOINT

FHM10 and FHC50

SETB HIFLO
ALARM

The SETB HIFLO ALARM item sets the high flow alarm set
point during SETBACK. A setback high flow alarm condition is
defined as when the exhaust flow is greater than the setback
high flow alarm set point during SETBACK.

NOTE: The SETB HI FLOW ALARM must be at least 50 cfm

greater than the SETPOINT.

OFF, 0 to 10000 cfm

OFF

30 Part Two

SETPOINTS MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

HIGH SASH
POSITION ALARM

FHC50 Only

HI SASH POS
ALARM

The HI SASH POS ALARM item is used to set the position of
the high sash alarm. INPUT SEL 1, must be set to SASH POS

VERT before setting this item.
NOTE: The Sash Position Potentiometer must be calibrated

before using this menu item.

OFF, 10 to 105%

OFF

DAMPER ALARM
FHC50 Only

DAMPER
ALARM

The DAMPER ALARM item sets the damper opening alarm
setpoint for both Normal and Setback modes. If the Model
FHC50 controller opens the damper more than the DAMPER

ALARM setpoint, it will activate Relay B.
NOTE: Relay B must be configured to DAMPER OPEN for the

DAMPER ALARM to be active.
DAMPER ALARM activates Relay B. DAMPER

ALARM does not activate audible or visual alarms.

OFF, 0 to 100%

OPEN

100% OPEN

SETPOINT/ALARM CONSTRAINTS

There are a number of constraints that prohibit you from incorrectly adjusting the set points. These are as follows:

1. The control SETPOINT and SETBACK set point have a lower limit of 60 ft/min. This is because generally accepted lab practices
indicate that fume hood containment is lost below this face velocity.

2. The controller has been designed so that the LOW ALARM set point must be set at least 20 ft/min below the control SETPOINT when
the FHC50 is set for face velocity control and 50 cfm when the FHC50 is set for flow control. For example, if the control SETPOINT is
100 ft/min, the LOW ALARM set point cannot be greater than 80 ft/min. This prevents nuisance alarms from occurring during natural
system fluctuations.

3. The controller has been designed so that the HIGH ALARM set point must be set at least 20 ft/min above the control SETPOINT
when the FHC50 is set for face velocity control and 50 cfm when the FHC50 is set for flow control. For example, if the control
SETPOINT is 100 ft/min, the HIGH ALARM set point cannot be less than 120 ft/min. This prevents nuisance alarms from occurring
during natural system fluctuations.

4. The monitor has been designed so that the LOW ALARM set point must be at least 40 fpm below the HIGH ALARM set point when
the FHM10 is set for face velocity control and 100 cfm below the HIGH ALARM set point when the FHM10 is set for flow control.

5. The ALARM RESET item selects how the alarms will terminate when controller returns to the safe range. The face velocity alarms all
terminate the same; they are either LATCHED or UNLATCHED. If UNLATCHED is selected, the low alarm automatically turns off
when the face velocity exceeds the low face velocity alarm value by 20 ft/min or the low flow alarm value by 50 cfm. Conversely, the
high alarm automatically turns off when the face velocity drops 20 ft/min below the high face velocity alarm set point or 50 cfm below
the high flow alarm set point. If LATCHED is selected, the alarms will not terminate until the RESET key is pressed.

Technical Section 31

INTERFACE MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

NETWORK
PROTOCOL

FHM10 and FHC50

NET PROTOCOL

The NET PROTOCOL item selects the communications
protocol used to interface with the building management
system.

Modbus®

N2

LonWorks®*

BACnet®*

MODBUS

NETWORK
ADDRES AND
SETTINGS

FHM10 and FHC50

NETWORK
SETTINGS

The NETWORK SETTINGS item enters a sub-menu with
settings, such as network address, that are configured for
each protocol.

NETWORK SETTINGS SUBMENU

PROTOCOL

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

Modbus, N2
FHM10 and FHC50

NETWORK
ADDRESS

The NETWORK ADDRESS item sets the main network
address of the fume hood controller. Each unit on the
network must have its own unique address.

1 to 247

1

BACnet
FHM10 and FHC50

MAC ADDRESS

The MAC ADDRESS item sets the main network address of
the fume hood controller. Each unit on the network must
have its own unique address.

1 to 127

1

BACnet
FHM10 and FHC50

MAC ID

The MAC ID item sets the Device ID.

1 to 4,194,302

100

BACnet
FHM10 and FHC50

AUTO BAUD

When the AUTO BAUD item is selected, the FHC50 will
automatically set its baud rate for BACnet MS/TP
communications.

LON
FHM10 and FHC50

SERVICE PIN

When the SERVICE PIN option is selected, the Model
FHC50 sends a broadcast message containing its Neuron
ID and program ID. This is required to install the Model
FHC50 on the LonWorks® network, or to reinstall the Model
FHC50 after using the GO UNCONFIGURED command.

32 Part Two

NETWORK SETTINGS SUBMENU

PROTOCOL

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

LON
FHM10 and FHC50

GO
UNCONFIGURED

Selecting the GO UNCONFIGURED option resets the Model

FHC50 controller’s authentication key. This is required in the

event a foreign network tool inadvertently acquires a Model
FHC50 and installs it with network management

authentication. The Model FHC50 controller’s owner will

then be unable to reclaim the Model FHC50 over the
network.

CALIBRATION MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

VELOCITY
SENSOR ZERO

FHM10 and FHC50

VEL SENSOR
ZERO

The VEL SENSOR ZERO item is used to calibrate the
Sidewall velocity sensor at zero flow.

A sensor zero should be established prior to adjusting the
sensor span (see Calibration section following menu item
listing).

NONE

Unit needs to be
calibrated upon
initial installation

NOTE: The menu item VEL SENSOR under the

CONFIGURE menu must be set to ENABLED, by
choosing an appropriate setting in the CONTROL
WIZARD, to activate the VEL SENSOR ZERO

function.

VEL SENSOR
SPAN

FHM10 and FHC50

VEL SENSOR
SPAN

The VEL SENSOR SPAN item is used to calibrate the
Sidewall velocity sensor to match the fume hood average
face velocity. The average face velocity is measured by
traversing the fume hood face with a portable air velocity
meter (see Calibration section following menu item listing).

A velocity sensor zero should be established prior to
adjusting the velocity sensor span (see Calibration section
following menu item listing).

NONE

Unit needs to be
calibrated upon
initial installation

NOTE: The menu item VEL SENSOR under the

CONFIGURE menu must be set to ENABLED, by
choosing an appropriate setting in the CONTROL
WIZARD, to activate the VEL SENSOR ZERO

function.

Technical Section 33

CALIBRATION MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

CALIBRATE FLOW

FHM10 and
FHC50

CALIBRATE
FLOW

The CALIBRATE FLOW item is used to enter a CALIBRATE

FLOW sub-menu that is specific to the FLOW DEVICE that

is selected (see Flow Calibrate section following menu item
listing).

NONE

Unit needs to be
calibrated upon
initial installation

NOTE: The CALIBRATE FLOW menu item will not appear

if the FLOW DEVICE under the CONFIGURE
menu has been set to NONE.

BALANCE MODE

FHC50 Only

BALANCE MODE

The BALANCE MODE item is used to enter a BALANCE
MODE sub-menu. After a flow device has been calibrated,
the BALANCE MODE screen can be used to compare the
Measured Flow against the Actual Flow as determined by a
pitot tube traverse.

NONE

N/A

NOTE: The CALIBRATE FLOW submenu must be

completed before entering the BALANCE MODE
submenu.

SASH CLOSED
POSITION
CALIBRATION

FHC50 Only

SASH CAL
CLOSED

The SASH CAL CLOSED item is used to record sash
position of the fume hood. This is determined in one of two
ways:

1. If a Vertical Sash Position Sensor is being used, this
menu item will record the physical position of the
Potentiometer with the sash closed.

2. If there is no Vertical Sash Position sensor, the
controller will use both the face velocity and flow
information in the sash closed position to calibrate the
sash % open equation.

Upon entering this menu item, the display will read “Lower
Sash, then Press Enter.” Make sure the sash is lowered

completely, and then press the Enter key.
This menu item will timeout after a period of one hour if the

Enter key is not pressed. No information will be saved if
timeout occurs.

This menu item will not appear if the controller is not
configured to accept a sash sensor or flow measurement
with sidewall sensor.

NONE

Unit needs to be
calibrated upon
initial installation

34 Part Two

CALIBRATION MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

SASH OPEN
POSITION
CALIBRATION

FHC50 Only

SASH CAL OPEN

The SASH CAL OPEN item is used to record sash position
of the fume hood. This is determined in one of two ways:

1. If a Vertical Sash Position Sensor is being used, this
menu item will record the physical position of the
Potentiometer with the sash open.

2. If there is no Vertical Sash Position sensor, then the
controller will use both the face velocity and flow
information in the sash open position to calibrate the
sash % open equation.

Upon entering this menu item, the display will read “Raise
Sash, then Press Enter.” Make sure the sash is raised, and

then press the Enter key.
This menu item will timeout after a period of one hour if the

Enter key is not pressed. No information will be saved if
timeout occurs.

This menu item will not appear if the controller is not
configured to accept a sash sensor or flow measurement
with sidewall sensor.

NONE

Unit needs to be
calibrated upon
initial installation

CALIBRATE FLOW SUBMENU

PRESSURE FLOW STATION

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE
SELECTED

FHM10 and FHC50

FLOW DEVCE =

This item displays the FLOW DEVICE that was previously
selected through the CONFIG WIZARD item.

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi
Calculated

Press Flo Sta

(Read-only value)

Technical Section 35

CALIBRATE FLOW SUBMENU

PRESSURE FLOW STATION

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

RESET FLOW
CALIBRATION

FHM10 and FHC50

FLOW RESET
CAL

The RESET CAL menu item zeroes out the flow calibration
adjustments. When this menu item is entered, the controller
will prompt the user to verify that they want to do this by
displaying the message “Are You Sure.” Entering YES
resets the flow calibration factors for this flow device to

defaults and shows the message “Changes Saved.”

Entering NO will cancel the reset and show the message
“Changes Not Saved.”

NONE

FLOW STATION
DUCT AREA

FHM10 and FHC50

FLO STA AREA

The FLO STA AREA item is used to program the cross
sectional area of the duct where the flow station is mounted.
Since the flow station is used to measure duct velocity, the

FLO STA AREA is necessary to calculate the duct air flow.
NOTE: The DIM does not compute duct area. The area

must be first calculated and then entered into the

unit.
Use the following equations to calculate the duct area (in ft2)
For round ducts

For rectangular ducts

WARNING: If the proper FLO STA AREA is not

programmed into the Model FHC50, the flow
measurement will be incorrect. Thus, all the
other information that uses the flow
measurement, such as the flow alarms and
percent sash open, will also be incorrect.

0 to50.00 ft2

(0 to 4.6450 m2)

0.00 ft2
(0.0000 m2) 0))))

FLOW STATION
PRESSURE FULL
SCALE

FHM10 and FHC50

FLO STA PRESS
FS

The FLO STA PRESS FS menu item allows the user to
select the maximum range of the pressure transducer used
with the flow station.

0.10 inH2O

0.25 inH2O

0.50 inH2O

1.0 inH2O

1.0 inH2O

36 Part Two

CALIBRATE FLOW SUBMENU

PRESSURE FLOW STATION

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW STATION
PRESSURE ZERO

FHM10 and
FHC50

FLO STA PRESS
ZERO

The FLO STA PRESS ZERO item is used to calibrate the
zero in the pressure transducer. See Calibration section for
the procedure to zero the flow station.

NONE

FLOW STATION
OUTPUT RANGE

FHM10 and FHC50

FLO STA FS V

The FLO STA FS V item is used to set the voltage signal
output range of the pressure transducer. Set this item to
match the pressure transducer used.

NOTE: If a pressure transducer with a 1-5 V output is

used, select 0 to 5V. If a pressure transducer with a

2-10 V output is used, select 0 to 10V

0 to 5V, 0 to 10V

0 to 10V

FLOW STATION
LOW CAL

FHM10 and FHC50

FLO STA LO CAL

The FLO STA LO CAL menu item enters the FLO STA LO
CAL Submenu.

See FLO STA LO

CAL Menu

FLOW STATION
HIGH CAL

FHM10 and
FHC50

FLO STA HI CAL

The FLO STA HI CAL menu item enters the FLO STA HI
CAL Submenu.

See FLO STA HI

CAL Menu

FLOW K FACTOR

FHM10 and
FHC50

FLOW KFACTOR

The K FACTOR menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K FACTOR so
that the flow measurement matches the actual flow,
determined with a pitot tube traverse.

NOTE: FLOW K FACTOR modifies the entire range of the

calibrated flow, not just a single point.

0.01 to 10.00

1.00

Technical Section 37

CALIBRATE FLOW SUBMENU

LINEAR FLOW STATION ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE
SELECTED

FHM10 and
FHC50

FLOW DEVCE =

This item displays the FLOW DEVICE that was previously
selected through the CONFIG WIZARD item.

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi
Calculated

Lin Flo Sta
(Read-only

value)

RESET FLOW
CALIBRATION

FHM10 and
FHC50

FLOW RESET
CAL

The RESET CAL menu item zeroes out the flow calibration
adjustments. When this menu item is entered, the controller
will prompt the user to verify that they want to do this by
displaying the message “Are You Sure.” Entering YES
resets the flow calibration factors for this flow device to

defaults and shows the message “Changes Saved.”

Entering NO will cancel the reset.

NONE

FLOW STATION
DUCT AREA

FHM10 and
FHC50

FLO STA AREA

The FLO STA AREA item is used to program the cross
sectional area of the duct where the flow station is mounted.
Since the flow station is used to measure duct velocity, the

FLO STA AREA is necessary to calculate the duct air flow.
NOTE: The DIM does not compute duct area. The area

must be first calculated and then entered into the

unit.
Use the following equations to calculate the duct area (in ft2)
For round ducts

For rectangular ducts

0 to50.00 ft2

(0 to 4.6450 m2)

0.00 ft2

(0.0000 m2)

WARNING: If the proper FLO STA AREA is not

programmed into the Model FHC50, the flow
measurement will be incorrect. Thus, all the
other information that uses the flow
measurement, such as the flow alarms and
percent sash open, will also be incorrect.

38 Part Two

CALIBRATE FLOW SUBMENU

LINEAR FLOW STATION ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW STATION
TOP VELOCITY

FHM10 and
FHC50

FLO STA TOP
VEL

The TOP VELOCITY item is used to input the maximum
velocity of a linear flow station output. A TOP VELOCITY
must be input for the linear flow station to operate.

0 to 10,000 ft/min

(0 to 50.8 m/s)

0 ft/min

(0 m/s)

FLOW STATION
OUTPUT RANGE

FHM10 and
FHC50

FLO STA
FS V

The FLO STA FS V item is used to set the voltage signal
output range of the pressure transducer. Set this item to
match the pressure transducer used.

0 to 5V, 0 to 10V

0 to 10V

FLOW K FACTOR

FHM10 and
FHC50

FLOW KFACTOR

The K FACTOR menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K FACTOR so
that the flow measurement matches the actual flow,
determined with a pitot tube traverse.

NOTE: FLOW K FACTOR modifies the entire range of the

calibrated flow, not just a single point.

0.01 to 10.00

1.00

CALIBRATE FLOW SUBMENU

LOM VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE
SELECTED

FHM10 and FHC50

FLOW DEVCE =

This item displays the FLOW DEVICE that was previously
selected through the CONFIG WIZARD item.

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi

Calculated

LOM Venturi

(Read-only

value)

Technical Section 39

CALIBRATE FLOW SUBMENU

LOM VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

RESET FLOW
CALIBRATION

FHM10 and FHC50

FLOW RESET
CAL

The RESET CAL menu item zeroes out the flow calibration
adjustments. When this menu item is entered, the controller
will prompt the user to verify that they want to do this by
displaying the message “Are You Sure.” Entering YES
resets the flow calibration factors for this flow device to

defaults and shows the message “Changes Saved.”

Entering NO will cancel the reset and show the message
“Changes Not Saved.”

NONE

WARNING: Monitor and/or controller alarm functions will

not be maintained after resetting flow
calibration. Immediately recalibrate monitor or
controller after resetting flow calibration.

MINIMUM FLOW
FHM10 and FHC50

VENTURI LF MIN
FLOW

The VENTURI LF MIN FLOW item sets the flow rate
through the venturi valve when it is fully closed. The display
will indicate a volumetric flow rate. Adjust the displayed
value to match the flow through the venturi valve.

NOTE: The flow information can be obtained from the

label on the TSI Venturi Valve or by closing the
venturi valve using the CONTROL OUT item in
the DIAGNOSTICS menu and performing a pitot
tube traverse of the duct.

The VENTURI LF MIN FLOW menu item must be
completed before moving on to the VENTURI LF MAX
FLOW menu item.

0 to 10000 cfm

0 cfm

40 Part Two

CALIBRATE FLOW SUBMENU

LOM VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

MAXIMUM FLOW
FHM10 and FHC50

VENTURI LF MAX
FLOW

The VENTURI LF MAX FLOW item sets the flow rate
through the venturi valve when it is fully open. The display
will indicate a volumetric flow rate. Adjust the displayed
value to match the flow through the venturi valve.

NOTE: The flow information can be obtained from the

label on the TSI Venturi Valve or by opening the
venturi valve using the CONTROL OUT item in
the DIAGNOSTICS menu and performing a pitot
tube traverse of the duct.

The VENTURI LF MIN FLOW menu item must be
completed before moving on to the VENTURI LF MAX
FLOW menu item.

0 to 10000 cfm

0 cfm

FLOW K FACTOR
FHM10 and FHC50

FLOW KFACTOR

The K FACTOR menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K FACTOR so
that the flow measurement matches the actual flow,
determined with a pitot tube traverse.

NOTE: FLOW K FACTOR modifies the entire range of

the calibrated flow, not just a single point.

0.01 to 10.00

1.00

Technical Section 41

CALIBRATE FLOW SUBMENU

6PT VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE
SELECTED

FHC50 Only

FLOW DEVCE =

This item displays the FLOW DEVICE that was previously
selected through the CONFIG WIZARD item.

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi

Calculated

6Pt Venturi
(Read-only

value)

RESET FLOW
CALIBRATION

FHC50 Only

FLOW RESET
CAL

The RESET CAL menu item zeroes out the flow calibration
adjustments. When this menu item is entered, the controller
will prompt the user to verify that they want to do this by
displaying the message “Are You Sure.” Entering YES
resets the flow calibration factors for this flow device to

defaults and shows the message “Changes Saved.”

Entering NO will cancel the reset and show the message

“Changes Not Saved.”
WARNING: Controller alarm functions will not be

maintained after resetting flow calibration.
Immediately recalibrate controller after
resetting flow calibration.

NONE

VENTURI VALVE
POSITION 1 FLOW

FHC50 Only

VENTURI PT1

The VENTURI PT1 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 0% OPEN position.

NOTE: The flow information can be obtained through a

direct flow measurement (i.e. duct traverse) after
using the CONTROL OUT item to set the damper
to 0% Open or from the label on the TSI Venturi
Valve.

The VENTURI PT1 menu item must be completed before
moving on to the VENTURI PT2 menu item.

0 to 10000 cfm

0 cfm

42 Part Two

CALIBRATE FLOW SUBMENU

6PT VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

VENTURI VALVE
POSITION 2 FLOW

FHC50 Only

VENTURI PT2

The VENTURI PT2 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 20% OPEN position.

NOTE: The flow information can be obtained through a

direct flow measurement (i.e. duct traverse) after
using the CONTROL OUT item to set the damper
to 20% Open or from the label on the TSI Venturi
Valve.

The VENTURI PT2 menu item must be completed before
moving on to the VENTURI PT3 menu item.

0 to 10000 cfm

0 cfm

VENTURI VALVE
POSITION 3 FLOW

FHC50 Only

VENTURI PT3

The VENTURI PT3 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 40% OPEN position.

NOTE: The flow information can be obtained through a

direct flow measurement (i.e. duct traverse) after
using the CONTROL OUT item to set the damper
to 40% Open or from the label on the TSI Venturi
Valve.

The VENTURI PT3 menu item must be completed before
moving on to the VENTURI PT4 menu item.

0 to 10000 cfm

0 cfm

Technical Section 43

CALIBRATE FLOW SUBMENU

6PT VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

VENTURI VALVE
POSITION 4 FLOW

FHC50 Only

VENTURI PT4

The VENTURI PT4 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 60% OPEN position.

NOTE: The flow information can be obtained through a

direct flow measurement (i.e. duct traverse) after
using the CONTROL OUT item to set the damper
to 60% Open or from the label on the TSI Venturi
Valve.

The VENTURI PT4 menu item must be completed before
moving on to the VENTURI PT5 menu item.

0 to 10000 cfm

0 cfm

VENTURI VALVE
POSITION 5 FLOW

FHC50 Only

VENTURI PT5

The VENTURI PT5 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 80% OPEN position.

NOTE: The flow information can be obtained through a

direct flow measurement (i.e. duct traverse) after
using the CONTROL OUT item to set the damper
to 80% Open or from the label on the TSI Venturi
Valve.

The VENTURI PT5 menu item must be completed before
moving on to the VENTURI PT6 menu item.

0 to 10000 cfm

0 cfm

44 Part Two

CALIBRATE FLOW SUBMENU

6PT VENTURI VALVE ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

VENTURI VALVE
POSITION 6 FLOW

FHC50 Only

VENTURI PT6

The VENTURI PT6 item is used to calibrate a venturi valve
without feedback. When this item is entered, the display will
indicate a volumetric flow rate. Adjust the displayed value to
match the flow through the venturi valve when the venturi
valve is at the 100% OPEN position.

0 to 10000 cfm

0 cfm

NOTE: The flow information can be obtained through a

direct flow measurement (i.e., duct traverse) after
using the CONTROL OUT item to set the damper
to 100% Open or from the label on the TSI Venturi
Valve.

FLOW K FACTOR
FHC50 Only

FLOW
KFACTOR

The K FACTOR menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K FACTOR so
that the flow measurement matches the actual flow,
determined with a pitot tube traverse.

NOTE: FLOW K FACTOR modifies the entire range of

the calibrated flow, not just a single point.

0.01 to 10.00

1.00

CALIBRATE FLOW SUBMENU

CALCULATED FLOW ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

FLOW DEVICE
SELECTED

FHC50 Only

FLOW DEVCE =

This item displays the FLOW DEVICE that was previously
selected through the CONFIG WIZARD item.

Lin Flo Sta

Press Flo Sta

LOM Venturi

6pt Venturi

Calculated

Calculated

(Read-only

value)

Technical Section 45

CALIBRATE FLOW SUBMENU

CALCULATED FLOW ONLY

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

RESET FLOW
CALIBRATION

FHC50 Only

FLOW RESET
CAL

The RESET CAL menu item zeroes out the flow calibration
adjustments. When this menu item is entered, the controller
will prompt the user to verify that they want to do this by
displaying the message “Are You Sure.” Entering YES
resets the flow calibration factors for this flow device to

defaults and shows the message “Changes Saved.”

Entering NO will cancel the reset and show the message
“Changes Not Saved.”

NONE

WARNING: Controller alarm functions will not be

maintained after resetting flow calibration.
Immediately recalibrate controller after
resetting flow calibration.

FLOW K FACTOR

FHC50 Only

FLOW
KFACTOR

The K FACTOR menu item sets the “K” factor for the flow
signal. The flow signal is multiplied by the K FACTOR so
that the flow measurement matches the actual flow,
determined with a pitot tube traverse.

NOTE: FLOW K FACTOR modifies the entire range of

the calibrated flow, not just a single point.

0.01 to 10.00

1.00

BALANCE MODE SUBMENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

DESIRED FLOW

FHC50 Only

DESIRED FLOW

The DESIRED FLOW item is used to set and hold the
controller at a desired flow to enable a balancing technician
to verify flow through the fume hood.

0 to 10000 cfm

0

BALANCE MODE
K FACTOR

FHC50 Only
FLOW

KFACTOR

The FLOW KFACTOR item is used to adjust the measured
flow to match the actual flow measured by the balancing
technician.

0.01 to 10.00

1.00

NOTE: Changing the FLOW KFACTOR item also adjusts

the FLOW KFACTOR item stored under the
CALIBRATE FLOW submenu.

46 Part Two

BALANCE MODE SUBMENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

UNCORRECTED
FLOW

FHC50 Only

UNCORRECTED
FLOW

The UNCORRECTED FLOW item displays the measured
flow without applying a K Factor. This item is for reference
only.

0 to 10000 cfm

NONE

(Read-only

value)

K FACTOR USED
FHC50 Only

KF USED

The KF USED item is used to display the K Factor currently
being used to adjust the flow. This value is for reference
only, and will update when BAL MODE Kf is adjusted.

0.01 to 10.00

NONE

(Read-only

value)

CORRECTED
FLOW

FHC50 Only

FLOW * Kf

The FLOW*Kf item is used to display the corrected flow,
which multiplies the uncorrected flow by the K Factor
currently being used. This value is for reference only, and
will update when BAL MODE Kf is adjusted.

0 to 10000 cfm

NONE

(Read-only

value)

CONTROL MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

SENSITIVITY

FHC50 Only

SENSITIVITY

The SENSITIVITY item selects the integral dead band. The
integral dead band determines when the controller uses
integral control (slow control), and when the controller
enters PID control (fast control).

Each % of SENSITIVITY represents 1 ft/min (5 cfm) that the
face velocity (flow rate) must be away from set point before
the FHC50 controller enters PID control (fast control). For
example, if the SENSITIVITY is set to 80% and the set point
is 100 fpm (500 cfm), the face velocity must drop below 80
fpm (400 cfm) or rise above 120 fpm (600 cfm) for the
controller to enter PID control.

10% to 100%

80%

WARNING: Controller may hunt if SENSITIVITY is set too

high, resulting in poor control and loss of
containment.

SPEED

FHC50 Only

SPEED

The SPEED item selects the control output speed. The
greater the SPEED setting, the faster the control output.

10% to 100%

80%

Technical Section 47

CONTROL MENU

MENU ITEM

SOFTWARE

NAME

ITEM DESCRIPTION

ITEM RANGE

DEFAULT

VALUE

CONTROL
SIGNAL

FHC50 Only

CONTROL SIG

The CONTROL SIG item determines the control signal’s
output direction. As an example: if the control system closes
the exhaust damper instead of opening the damper, this
option will reverse the control signal to now open the
damper.

DIRECT OR

REVERSE

DIRECT

Kc VALUE
Ti VALUE

FHC50 Only

Kc VALUE
Ti VALUE

The Kc VALUE item changes the gain control coefficient.
When this item is entered, a value for Kc is indicated on the
display. If the controller is not controlling correctly (hunting,
oscillating, or controlling slowly) the Kc VALUE control
coefficient may need adjusting. Decreasing Kc will slow the
control system down making it more stable.

The Ti VALUE item changes the integral control coefficient.
When this item is entered, a value for Ti is indicated on the
display. If the controller is not controlling correctly, the unit
may have an inappropriate Ti VALUE control coefficient.
Increasing Ti will slow the control system down making it
more stable.

WARNING: The Kc VALUE and Ti VALUE items provide

you with the ability to manually change the PI
control loop variables. DO NOT CHANGE

THESE VALUES UNLESS YOU HAVE A
THOROUGH UNDERSTANDING OF PID
CONTROL LOOPS. CONTACT TSI FOR
ASSISTANCE PRIOR TO CHANGING ANY
VALUES. Incorrectly changing a value will

result in poor or non-existent control.

Suggestion: Before changing Kc or Ti, change the SPEED

or adjust the SENSITIVITY to try to eliminate
the problem.

Kc = 0 to 1000

Ti = 0-1000

The range of values is
very large. Poor
control may occur if
values are more than
twice or less than 1/2
the default value

Kc = 100
Ti = 110

(This page intentionally left blank)

48 Part Two

WARNING

The controller is disabled during calibration. Containment may not be maintained.

NOTE: Always zero sensor prior to adjusting the sensor span. A comparison

thermal anemometer is required to calibrate the velocity span. Confirm a
good average face velocity is present in the fume face before adjusting
the span.

Calibration

The calibration section explains how to calibrate the controller and how to zero a TSI flow station
pressure transducer (optional). The Fume Hood Monitor or Controller must be calibrated, after
being installed on the fume hood, to provide accurate indication of fume hood face velocity and/or
exhaust flow. The FHM10 Monitor and FHC50 Controller will warn the user with a display
message if it has not been calibrated.

NOTE: This section assumes that the appropriate sensor has been correctly installed. Inaccurate

readings may be detected if sensor is not installed correctly. Review the Installation
Instructions and verify that the sensor is installed correctly (usually only a problem on
initial set up).

The following items are needed to calibrate a Model FHM10 Fume Hood Monitor or
Model FHC50 Fume Hood Controller:

 Masking tape
 Tape measure
 Portable Air Velocity Meter such as TSI VelociCalc® Model 9545 or Model 9515.

To begin the calibration process, enter CALIBRATION menu (see Software Programming if not
familiar with keystroke procedure).

Face Velocity Calibration

Face velocity can be controlled using either a sidewall sensor or sash-position sensor with a
venturi valve.

Sidewall Velocity Sensor—Sensor Zero

1. Select VEL SENSOR ZERO item.

2. The controller will prompt to “Tape over sensor, then press .” Place a piece of tape over
the velocity sensor opening to seal off air flowing past the sensor and press the  soft key.

3. The display will indicate a countdown for the automatic sensor zero procedure, which takes
120 seconds. While counting down the 120 seconds, the controller will also display the
current sensor voltage.

4. After the 120 second countdown, the controller will display “Remove tape from sensor, then

press .” Remove tape from sensor and press the  key to save the zero point.

Sidewall Velocity Sensor—Sensor Span

1. Open the fume hood sash 60% (or to working height) and let the controller reach face
velocity set point.

49

50

WARNING

Calibrating the sidewall velocity span on the controller may be an iterative process
that takes 1 to 3 trials to get an accurate calibration. After adjusting the span factor,
check the calibration to verify an accurate calibration.

Desired Flow

Flow set point to achieve desired face velocity

Show Sash % Open

Readout of current sash % open

Actual Flow

Readout of current measured flow

Save & Continue

Use to save data point

Set flow for

Desired face velocity

2. Select VEL SENSOR SPAN item (30 second countdown). After the countdown, the
VEL SENSOR SPAN submenu will be displayed.

3. Use a thermal anemometer to traverse the open sash area and obtain the average face
velocity of the air passing into the hood.

4. Compare the thermal anemometer reading to the SPANNED VEL reading on the controller.

5. At the ENTER SPAN FACT menu item, press the quick keys to adjust the factor until the
SPANNED VEL reading on the controller display matches the thermal anemometer velocity.

6. Press the ENTER () soft key to save the sensor span calibration.
NOTE: To verify proper calibration, re-enter VEL SENSOR SPAN item and compare

SPANNED VEL reading to a new thermal anemometer traverse.

7. Exit menu, sidewall sensor calibration is complete.

Sash Position Calibration

1. Calibrate flow using LOM VENTURI Calibration section.

2. Calibrate vertical sash sensor using CALIBRATE SASH POT section.

3. Enter SASH FLOW CONTROL item.

4. Controller will prompt “Raise sash to 24 inches height then press .” Open the sash(es) to
the 24-inch height and press the  key.

a. The FHC50 controller will display the following items:

b. Perform a face velocity traverse using a thermal anemometer. Compare the face velocity

traverse reading to the face velocity set point.

c. Adjust the Desired Flow to change the flow control set point for the 24-inch sash position

until actual face velocity matches the Set flow for set point.

d. Repeat steps b. and c. as needed before selecting Save & Continue to save the high

sash position calibration.

Part Two

51

Desired Flow

Flow set point to achieve desired face velocity

Show Sash % Open

Readout of current sash % open

Actual Flow

Readout of current measured flow

Save & Continue

Use to save data point

Set flow for

Desired face velocity

Desired Flow

Flow set point to achieve desired face velocity

Show Sash % Open

Readout of current sash % open

Actual Flow

Readout of current measured flow

Save & Continue

Use to save data point

Set flow for

Desired face velocity

5. Controller will prompt “Lower sash to 12 inches height then press .” Lower the sash(es)
to the 12-inch height, so the fume hood bypass (if present) is just covered, and press the
 key.

a. The FHC50 controller will display the following items:

b. Perform a face velocity traverse using a thermal anemometer. Compare the face velocity

traverse reading to the face velocity set point.

c. Adjust the Desired Flow to change the flow control set point for the 24-inch sash position

until actual face velocity matches the Set flow for set point.

d. Repeat steps b. and c. as needed before selecting Save & Continue to save the sash

mid-point calibration.

6. Controller will prompt “Lower sash to 2 inches height then press .” Lower the sash(es) to
the 2-inch height, so the sash(es) are nearly closed, and press the  key.

a. The FHC50 controller will display the following items:
b. Perform a face velocity traverse using a thermal anemometer. Compare the face velocity

traverse reading to the face velocity set point.

c. Adjust the Desired Flow to change the flow control set point for the 24-inch sash position

until actual face velocity matches the Set flow for set point.

d. Repeat steps b. and c. as needed before selecting Save & Continue to save the sash

closed calibration.

7. Controller will display “Sash position vs. flow is done calibrating. Press .” Press the

 key to save calibration and continue.

Flow Calibration

Flow can be measured using a Pressure Flow Station, Linear Flow Station, LOM Venturi, 6-Pt
Venturi, or Calculated from face velocity and open sash area.

Pressure Flow Station Calibration
NOTE: Flow stations are optional and may not be installed in your system.

1. Enter CALIBRATE FLOW item.

2. Set FLO STA AREA to the duct area at the flow station location.

3. Set FLO STA PRESS FS to match the range of the pressure transducer used.

Technical Section

52

FLO STA LO SETPT

Damper position for low flow calibration

PRESS ZERO VOLTAGE

Voltage from pressure transducer during Flow Station
Pressure Transducer Zero

PRESSURE VOLTAGE

Current voltage from pressure transducer

MEASURED FLOW

Current flow rate

ENTER ACTUAL FLOW

Input actual flow as measured with reference instrument
here

Flow Station Pressure Transducer Zero

1. Disconnect tubing between pressure transducer and flow station.

2. Select FLO STA PRESS ZERO menu item.

3. Press the ENTER ( ) soft key. Flow zero procedure, which takes 10 seconds, is

automatic. During the 10 second flow zero procedure, the display will indicate the current
flow station pressure transducer voltage.

4. Connect tubing between pressure transducer and flow station.

Low Flow Calibration

1. Set FLO STA FS V to match the voltage output (0 to 10V or 0 to 5V) of the pressure

transducer used.

2. Close the sash.

3. Select FLO STA LO CAL to enter a submenu with the following items:

5. With the FLO STA LO SETPT at 0% (default), observe the PRESSURE VOLTAGE

displayed on the screen, or use a voltmeter to read the voltage at the pressure input
terminals 7-8 on the back of the controller.

6. Slowly increase the FLO STA LO SETPT percentage value to adjust the damper position

until the PRESSURE VOLTAGE (pressure transducer output) shows the first noticeable
increase in voltage from the 0% position. A general rule of thumb is that the voltage
change should occur with the damper between approximately 10 to 30% open.

NOTE: Adjusting the FLO STA LO SETPT with the quick keys allows the

PRESSURE VOLTAGE to be displayed in real time.

7. For reference only, the MEASURED FLOW item will display the default measured flow

based on the current settings of the flow station (duct area, etc.).

8. Determine the actual flow with a duct traverse.

9. Enter the actual flow measurement under the ENTER ACTUAL FLOW menu item.

10. Press the ENTER ( ) soft key to save the flow data.

11. The low flow calibration is complete. Exit the menu with the ESC key.

Part Two

53

FLO STA LO SETPT

Damper position for low flow calibration

PRESS ZERO VOLTAGE

Voltage from pressure transducer during Flow Station
Pressure Transducer Zero

PRESSURE VOLTAGE

Current voltage from pressure transducer

MEASURED FLOW

Current flow rate

ENTER ACTUAL FLOW

Input actual flow as measured with reference instrument
here

High Flow Calibration

1. Enter CALIBRATION FLOW menu and raise the sash height to approximately 18 inches

(sash stop).

2. Select FLO STA HI CAL to enter a submenu with the following items:

3. With the FLO STA HI SETPT at 100% (default), observe the PRESSURE VOLTAGE

displayed on the screen, or use a voltmeter to read the voltage at the pressure signal
transducer input terminals 7-8 on the back of the controller.

4. Slowly decrease the FLO STA HI SETPT percentage value to adjust the damper position

until the PRESSURE VOLTAGE (pressure transducer output) shows the first noticeable
decrease in voltage from the 100% position. A general rule of thumb is that the voltage
change should occur with the damper between approximately 70 to 90% open.

NOTE: Adjusting the FLO STA HI SETPT with the quick keys allows the

PRESSURE VOLTAGE to be displayed in real time.

5. For reference only, the MEASURED FLOW item will display the default measured flow

based on the current settings of the flow station (duct area, etc.).

6. Determine the actual flow with a duct traverse.

7. Enter the actual flow measurement under the ENTER ACTUAL FLOW menu item

8. Press the ENTER ( ) soft key to save the flow data.

9. The high flow calibration is complete. Exit the menu with the ESC key.

NOTE: Use BALANCE MODE to verify flow station calibration.

Linear Flow Station Calibration
NOTE: Flow stations are optional and may not be installed in your system.

1. Enter CALIBRATE FLOW item.

2. Set FLO STA AREA to the duct area at the linear flow station location.

3. Set FLO STA TOP VEL to match the range of the linear flow station used.

4. Set FLO STA FS V to match the voltage output (0 to 10V or 0 to 5V) of the linear flow
station used.

5. Linear flow station calibration should be complete. Exit the menu.

NOTE: Use BALANCE MODE to verify flow station calibration.

Technical Section

54

NOTE: 6Pt Venturi Valves are optional and may not be installed in your system.
If venturi valve flow data cannot be obtained from venturi valve label,

perform duct traverse with venturi valve at 0%, 20%, 40%, 60%, 80% and
100% open (see item CONTROL_OUT in DIAGNOSTICS menu).

NOTE: Calibrating Calculated Flow requires first calibrating the Face Velocity

using the Sidewall Sensor and calibrating the Sash Pot.

LOM Venturi Calibration
NOTE: LOM Venturi Valves are optional and may not be installed in your system.

1. Obtain the venturi valve minimum and maximum flow, either by reading the label on the
venturi valve or by performing duct traverses when the venturi valve is fully closed and fully
opened.

2. Enter CALIBRATE FLOW item.

3. Set VENTURILOM MIN to the minimum venturi valve flow.

4. Set VENTURILOM MAX to the maximum venturi valve flow.

5. LOM Venturi Calibration can be adjusted using the Flow KFactor item.

6. LOM venturi valve calibration is now complete. Exit the menu.

NOTE: Use BALANCE MODE to verify LOM Venturi calibration.

6Pt Venturi Calibration

1. Obtain the venturi valve calibration data by reading the label on the venturi valve.

2. Enter CALIBRATE FLOW item.

3. Enter venturi valve minimum flow in item VENTURI PT1.

4. Enter 2nd point flow in item VENTURI PT2.

5. Enter 3rd point flow in item VENTURI PT3.

6. Enter 4th point flow in item VENTURI PT4.

7. Enter 5th point flow in item VENTURI PT5.

8. Enter 6th point flow in item VENTURI PT6.

9. 6pt venturi valve calibration is now complete. Exit the menu.

NOTE: Use BALANCE MODE to verify 6Pt Venturi calibration.

Calculated Flow Calibration

1. Enter CAL SASH AREA menu item.

2. Controller will display current sash position and prompt “Fully close sash then press .”
Close the sash and press the  key. After closing the sash(es) and pressing the , controller
will count down for 5 seconds while it allows control to stabilize.

3. Controller will prompt to “Enter Actual Flow”. Perform a duct traverse or otherwise measure
fume hood exhaust volume and enter it into the controller.

4. Press the ESC key to continue.

Part Two

55

NOTE: Verify Sash Pot Calibration to ensure proper wiring and installation.

5. Controller will display current sash pot position and prompt “Fully open sash then press .”
Open the sash and press the  key. After opening the sash and pressing the , controller will
count down for 5 seconds while it allows control to stabilize.

6. Controller will prompt to “Enter Actual Flow”. Perform a duct traverse or otherwise measure
fume hood exhaust volume and enter it into the controller.

7. Press the ESC key to continue.

8. Controller will display “Sash area vs position is calibrated. Press .” Press the  key to
save calibration.

NOTE: Use BALANCE MODE to verify Calculated Flow calibration or use CALIBRATE FLOW

item to adjust the FLOW K-FACTOR.

Sash Opening Calibration

The Sash Opening may be calibrated using a Sash Pot (Vertical Sash Sensor).

Calibrate Sash Pot

1. Enter CAL SASH POT item.

2. Controller will display current sash pot voltage and prompt “Fully close sash then press .”
Close the sash(es) and press the  key.

3. Controller will display current sash pot voltage and prompt “Fully open sash then press .”
Open the sash(es) and press the  key.

4. Controller prompts “Sash position sensor is calibrated. Press .” Press the  key to save
calibration and exit the menu.

5. Verify Sash Pot calibration by entering the Show Sash%Open item in the DIAGNOSTICS
menu.

a. For fume hoods with a single vertical sash, verify that the displayed sash opening moves

from 0% to 100% as the sash is moved from full closed to full open.

b. For fume hoods with two vertical sashes, verify that the displayed sash opening is:

i. 0% with both sashes closed.

ii. 50% with 1 sash open and 1 sash closed. Verify operation with each sash

individually opened.

iii. 100% with both sashes open.

c. For fume hoods with 3 vertical sashes, verify that the displayed sash opening is:

i. 0% with all sashes closed.

ii. 33% with 1 sash open and 2 sashes closed. Verify calibration with each of the

3 sashes individually opened.

iii. 66% with 2 sashes open and 1 sash closed. Verify calibration with each of the

3 sashes individually closed.

iv. 100% with all sashes open.

Technical Section

56

Optimizing Controller Performance

The Model FHC50 controller uses both integral and PI control methods. Integral control (slower
control signal) is used when the controller is near set point. Integral control provides stability
when natural system fluctuations occur such as operators working at hoods and lab doors
opening. PI control (fast control) is used when responding to large disturbances to face velocity
such as sash movements. PI control rapidly returns the face velocity to set point, thus assuring
containment. Once the controller is in PI control, it continues to control in this mode until the
operating set point is met.

There are four menu items that change the characteristics of the control output signal;

1) SENSITIVITY

2) SPEED

3) Kc VALUE

4) Ti VALUE

TSI recommends only adjusting the SENSITIVITY and SPEED to fine tune the control signal.
Only when the SPEED and SENSITIVITY items cannot provide a stable system should
Kc VALUE and Ti VALUE be adjusted. The role of each menu item is covered in the Menu and

Menu Items section of the manual. This section provides some guidance of when a menu item

should be changed.
The controller is shipped with PI values that are appropriate for 95+ % of the fume hoods

installed. In fume hoods where some adjustment is needed, minor changes to the SENSITIVITY
and SPEED menu items will yield excellent control. The SENSITIVITY item selects when the unit
goes into PI control. Each percent of the setting from 100% indicates that the controller must be
1 ft/min away from control set point prior to activating PI control. If the SENSITIVITY setting is
60% (40% missing), the face velocity must be 40 ft/min off set point before PI control is activated.
Conversely, if the SENSITIVITY setting is 80% (20% missing), the face velocity must only be
20 ft/min off set point before PI control is activated. The default of 80% is usually a good
compromise between PID and integral control.

The SPEED menu item slows down the control output. The controller is shipped with a control
signal capable of rotating the damper 90 degrees in 1.5 seconds. This may be too fast if the
damper is in an unstable flow area (very near the exhaust fan), or there are competing air flows in
the laboratory. Controllers modulating a VFD system will probably need to be slowed down, since
the control signal is substantially faster than the VFD/fan can respond.

The remaining menu items, Kc VALUE and Ti VALUE should not be adjusted unless severe
stability problems exist. Adjusting these variables may improve the response and stability, but the
exact opposite may happen causing the controller to become unstable, hunt substantially, or
have very slow response. If controller performance cannot be improved by adjusting the SPEED
and SENSITIVITY, the two menu items can be manually set to their default values.

Maintenance and Repair Parts

The Model FHC50 Fume Hood Controller requires minimal maintenance. Periodic inspections of
system components as well as an occasional velocity sensor cleaning are all that are needed to
ensure that the Model FHC50 is operating properly. The Model FHC50 should be calibrated
annually. Refer to the Calibration section for further information.

Part Two

57

WARNING

If you are using a liquid to clean the sensor, turn off power to the Model FHC50. Do
NOT apply power before velocity sensor completely dries.

Do NOT use compressed air to clean the velocity sensors.
Do NOT attempt to scrape contaminants from the velocity sensors. The velocity

sensors are quite durable; however, scraping may cause mechanical damage and
possibly break the sensor. Mechanical damage due to scraping voids the sensor
warranty.

System Component Inspection

It is recommended that the velocity sensor be periodically inspected for accumulation of
contaminants. The frequency of these inspections is dependent upon the quality of the air being
drawn across the sensor. Quite simply, if the laboratory air is dirty, the sensors will require more
frequent inspection and cleaning.

Visually inspect the velocity sensor. The air flow orifice should be free of obstructions. The small,
cylindrical, ceramic sensor protruding from the orifice wall should be white and free of
accumulated debris.

Figure 5: Velocity Sensor

Periodically inspect the other system components for proper performance and physical signs of
excessive wear.

Velocity Sensor Cleaning

Accumulations of dust or dirt can be removed with a dry soft-bristled brush (such as an artist's
brush). If necessary, water, alcohol, acetone, or trichlorethane may be used as a solvent to
remove other contaminants.

Use extreme care when cleaning the velocity sensors. The ceramic sensor may break if
excessive pressure is applied, if sensor is scraped to remove contaminants, or if the cleaning
apparatus abruptly impacts the sensor.

Technical Section

58

Part Number

Description

Found on back of unit

Model FHC50 Fume Hood Controller

800320

Velocity Sensor

800325

Velocity/Controller Sensor Cable

800414

Transformer Cable

800199

Controller Output Cable

800380

Electric Actuator

Replacement Parts

All components of the Face Velocity Control system are field replaceable. Contact TSI or your
nearest TSI Manufacturer's Representative for replacement part pricing and delivery.

Troubleshooting Section

The Model FHM10 Fume Hood Monitor and FHC50 Fume Hood Controller is designed to be
trouble free. However, installation problems or interaction with other HVAC components may
cause system problems. The system is easy to troubleshoot if an organized approach to evaluate
the system is taken. Troubleshooting is broken down into hardware (mechanical) and software
problems. Hardware problems deal with the physical installation of the device. Hardware
problems include wiring problems, incorrectly installed equipment, and add-ons or non-TSI
equipment. Software problems include control problems, configuration problems, or interaction
problems with the HVAC system.

The hardware test described in this section determines that all TSI mechanical components are
functioning correctly. The hardware test requires the diagnostics menu items to be accessed. If
you are unfamiliar with the controller menus, see Software Programming for keystroke procedure.
Troubleshooting the majority of problems is usually quick if the hardware test is followed.

Software and hardware problems are covered in the troubleshooting chart. Pick the problem that
most closely resembles your problem and review the possible symptoms and corrective action.
Software or system performance problems can and are affected by the supply air system,
exhaust air system, or physical configuration of the room. Separating TSI system problems from
the laboratory HVAC system can sometimes be difficult. TSI recommends confirming all
hardware is operating correctly before troubleshooting software problems.

Hardware Test

Three tests need to be performed in order to determine all hardware is functioning correctly. The
tests are broken down into:

 Confirming wiring is correct.
 Confirming physical installation is correct.
 Verifying mechanical components.

Confirming wiring is correct

The most common problem with installed hardware equipment is incorrect wiring. This
problem usually exists on initial installation, or when modifications to the system take place.
The wiring should be very closely checked to verify it exactly matches the wiring diagram.
Wiring diagrams are located in Appendix C of this manual. Wiring associated with non-TSI
components should be closely checked for correct installation. If non-TSI components are
installed, consider disconnecting them for testing purposes.

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59

Confirming physical installation is correct

All of the hardware components need to be installed properly. Review the installation
instructions and verify components are installed properly at the correct location. This is easily
done when the wiring is checked.

Verifying mechanical components

Verifying all TSI components are operating correctly requires following a simple procedure.
The fastest procedure to confirm all equipment is operating is to first test the Digital Interface
Module (DIM), and then go into the diagnostic menu to test each component.

NOTE: These tests require power to the units, so if unit has no power, refer to hardware

troubleshooting chart to eliminate power problem.

TEST - DIM

Enter the SELF TEST menu item in the diagnostics menu to verify DIM electronics are
functioning correctly. During the self test, the display will show the model number and
software revision of the controller. At the end of the self test, the display will show a
message. The display shows:

 NO ERRORS if all DIM electronics are good.
 FRAM error if settings may have been lost. Press RESET to clear error and check all

settings for correct values.

 CALIB error if sensor calibration may have been lost. Verify face velocity, sash sensor

and/or flow calibration.

If NO ERRORS is displayed, proceed to test individual components in the Diagnostics Menu.
If the controller passes each of the tests, the mechanical piece parts are all functioning
correctly.

(continued on next page)

Technical Section

60

Menu Item

Description

Control Output

CONTROL OUT

Enter CONTROL OUT menu item in diagnostics menu. A number
between 0% open and 100% open representing the current damper or
venturi valve position will be displayed. Close the damper or venturi
valve fully using the quick keys or entering the CONTROL OUT item and
using the  key. Note the position of the control damper or venturi valve.
Open the damper or venturi valve fully using the quick keys or the 
key. The damper should have rotated 90 degrees, or the venturi valve
should have moved its full stroke. If the damper rotated less than 85
degrees (or the venturi valve moved less than 90% of full stroke), see

Troubleshooting chart: Control system is not controlling. If the damper or

valve is fully closed when the CONTROL OUT item is 100% open,
change direction of control using CONTROL SIG item in CONTROL
menu.

WARNING: The CONTROL OUT function overrides the face velocity

or flow control signal. Adequate face velocity or flow will

NOT be maintained while in this menu item.

Velocity Sensor Input

VEL SENSOR INPUT

The VEL SENSOR INPUT item verifies that the controller electronics is
receiving a signal from a sidewall sensor. When this item is entered, a
voltage will be indicated on the display. The exact number displayed is
relatively unimportant. It is more important that the displayed number
changes when the velocity changes (blow on sensor, move sash, etc.). If
display does not change, see Troubleshooting chart; “SENSOR ERROR”
flashing on display.

SHOW FACE VEL

The SHOW FACE VEL item is used to display the current face velocity,
either as measured by a sidewall sensor or calculated from exhaust flow
rate and open sash area.

NOTE: If face velocity does not match actual readings, recalibrate

face velocity.

Flow Station Input

FLOW ANALOG
INPUT

The FLOW ANALOG INPUT item is used to read the input from the flow
station. When this item is entered, a voltage is indicated on the display.
The exact number displayed is relatively unimportant. It is more
important that the voltage is changing which indicates the flow station is
working correctly.

0 VDC displayed equals zero flow.
10 VDC displayed equals maximum flow.

NOTE: FHM10 monitors and FHC50 controllers can be field

configured so 5 VDC displayed equals maximum flow.

Diagnostics Menu

The items in the Diagnostic Menu aid in identifying problems the staff may encounter. Upon
entering the Diagnostics Menu, all of the associated outputs hold at their most recent state.
Output can be temporarily changed by entering the item or by pressing the quick keys. No
permanent change occurs with these menu items. All of the associated inputs in the Diagnostics
Menu will continually update in order to monitor their function. The Diagnostics menu is exited by
pressing the ESC soft key. When the Diagnostics menu is exited, the controller returns to its
normal state.

Part Two

61

Menu Item

Description

Show Flow

SHOW FLOW

The SHOW FLOW INPUT item is used to display the current measured
or calculated rate of the fume hood exhaust flow in cfm, l/s or m3/hr.

NOTE: If flow does not match actual readings, recalibrate flow.

Analog Output

ANALOG OUT

The ANALOG OUT item varies the analog output from the unit. When
this item is entered, a number will be shown on the display indicating the
last analog output value. The value displayed ranges from 0 to 100%.
The value 0% corresponds to 0 volts (4 mA) output and 100%
corresponds to 10 Volts (20 mA) output. Pressing the  key will
increase the analog output. Pressing the  key will decrease the analog
output.

The ANALOG OUT function can be used in conjunction with a volt meter
to verify the analog output is correct.

Alarm Relay A

ALARM RELAY A

The ALARM RELAY A item changes the state of the alarm relay. When
this item is entered, the display will indicate either OK or ALARM. The

/ keys are used to toggle the state of the relay. See menu item
RELAYS OUT under the CONFIGURE menu for the desired contact
state (OK=OPEN or OK=CLOSED) during an alarm condition.

Alarm Relay B

ALARM RELAY B

The ALARM RELAY B item changes the state of the alarm relay. When
this item is entered, the display will indicate either OK or ALARM. The

/ keys are used to toggle the state of the relay. See menu item
RELAYS OUT under the CONFIGURE menu for the desired contact
state (OK=OPEN or OK=CLOSED) during an alarm condition.

Sash Contact Input

IN# SASH CONTACT

The IN# SASH CONTACT item reads the current state of a sash contact
input. This item will only be displayed when the corresponding INPUT
SEL # item has been set to SASH CONTACT under the CONFIGURE
menu. When this item is entered, the display will indicate either OPEN or
CLOSED. If the display indicates closed, the unit is in High Sash Alarm
mode.

NOTE: IN# SASH CONTACT is a read-only menu item.

Emergency Contact Input

IN# EMERG PURGE

The IN# EMERG PURGE item reads the current state of an emergency
contact input. This item will only be displayed when the corresponding

INPUT SEL # item has been set to EMERG PURGE under the
CONFIGURE menu. When this item is entered, the display will indicate

either OPEN or CLOSED. If the display indicates CLOSED, the
controller has been put into emergency mode through the contact input.
If the display indicates OPEN, the controller has not been put into
emergency mode through the contact input. However, the controller may
be in emergency mode if it has been initiated through the keypad or via
network communications.

NOTE: IN# EMERG PURGE is a read-only menu item.

Technical Section

62

Menu Item

Description

Setback Input

IN# NIGHT SETB

The IN# NIGHT SETB item reads the current state of a setback contact
input. This item will only be displayed when the corresponding INPUT
SEL # item has been set to NIGHT SETB under the CONFIGURE menu.
When this item is entered, the display will indicate either OPEN or
CLOSED. If the display indicates CLOSED, the controller has been put
into setback mode through the contact input. If the display indicates
OPEN, the controller has not been put into setback mode through the
contact input. However, the controller may be in setback mode if it has
been initiated through the keypad or via network communications.

NOTE: IN# NIGHT SETB is a read-only item.

Sash Position Input

IN1 SASH POS VER

The IN1 SASH POS VER item is used to read the input from the sash
position potentiometer. This item will only be displayed when the INPUT
SEL 1 item has been set to SASH POS VERT under the CONFIGURE
menu. When this item is entered, a voltage is indicated on the display.
The exact number displayed is relatively unimportant. More important is
that as the fume hood sash is moved, the voltage on the display should
also change, which indicates the sash position potentiometer is working
correctly.

NOTE: IN1 SASH POS VER is a read-only item.

Show Sash % Open

SHOW
SASH%OPEN

The SHOW SASH%OPEN item is used to display the current measured
or calculated sash open percentage.

Show Sash Open Area

SHOW SASH AREA

The SHOW SASH AREA item is used to display the current measured
or calculated sash open area in ft2 (or m2).

Unit Self Test

SELF TEST

Enter the SELF TEST menu item to verify DIM electronics are
functioning correctly. During the self test, the display will show the model
number and software revision of the controller. At the end of the self test,
the display will show NO ERRORS if all DIM electronics are good. If unit
displays an FRAM error at the end of the test, settings may be
corrupted. Check all menu items to determine cause of DATA ERROR.
If unit displays a CALIB error at the end of the test, calibration may have
been lost. Verify face velocity, sash sensor and/or flow calibration.

Reset Settings

RESET SETTINGS

The RESET SETTINGS item is used to change all settings to factory
default. RESET SETTINGS will not affect calibration.

WARNING: Unconfiguring the unit with the RESET SETTINGS item

may change critical settings including control set point.
Always reconfigure unit after using RESET SETTINGS
item.

Reset Calibration

RESET ALL CALIBS

The RESET ALL CALIBS item is used to clear field calibration data.

WARNING: Clearing field calibration data with the

RESET ALL CALIBS item may result in incorrect

calibration and/or loss of containment. Always recalibrate
unit after using RESET ALL CALIBS item.

Part Two

63

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Display is blank.

Fuse is blown.

Measure voltage at pins 1 and 2 on DIM 4-pin connector.
The voltage should nominally be:
24 to 40 VDC when using TSI electric actuators.
24 to 30 VAC when using motor speed drives.
If correct voltage is measured, internal DIM fuse is

probably blown. Unplug 4-pin connector from DIM for 2
minutes. The internal fuse will automatically reset. Plug
unit back in and check display. If display is still blank,
check all wiring, etc.

If approximately 5 volts is measured, the fuse in the
electric actuator is blown. Disconnect power to the
electric actuator for two minutes to reset fuse.
Disconnecting power requires either shutting off circuit
breaker or disconnecting the wires on pins 1 and 2 on the
electric actuator.

If zero volts are measured, see No power to DIM.
Verify circuit breaker is on.

Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.

If using DC power output from TSI electric actuator:

Verify electric actuator is receiving 24 to 30 VAC between
pins 1 and 2.

Verify 18 to 40 VDC is found between pins 3 and 4 of the
electric actuator.

No power to DIM.

Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
Verify 24 to 40 VDC is found between pins 3 and 4 of the

electric actuator.
Verify DIM voltage on pins 1 and 2 is 24 to 30 VAC for

VFD systems, or 32 to 40 VDC on electric actuators.

DIM is defective.

If proper voltage is found between pins 1 and 2 of the
DIM, all wiring has been checked, fuses have been reset,
and screen is still blank, the DIM is probably defective.
Replace DIM.

Technical Section

64

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Menu soft key
not displayed.

DISPL
SOFTKEYS set
to OFF.

Press left and right quick­keys and right-most soft key
simultaneously to gain
access to menu system. Set

DISPL SOFTKEYS item in
CONFIGURE menu to ON.

Need to display
model number
and firmware
revision

--

Select SELF TEST item in

DIAGNOSTICS menu or

display hello screen by
simultaneously pressing the
three right-most soft keys
while in the running screen.

Controller is not
controlling.

Incorrect wiring.

Verify correct wiring (see Wiring diagram; Appendix C).
DIM must be wired exactly as shown.

Damper/Valve
moving opposite
direction.

If damper is full open when it should be closed or full
closed when it should be open, go into CONTROL menu

CONTROL SIG menu item. Change DIRECT to
REVERSE or REVERSE to DIRECT to change control

output direction.

No control output
signal.

Go into DIAGNOSTICS menu, CONTROL OUT item. A
number between 0% OPEN and 100% OPEN will be
displayed. Pressing the  key increases the number.
Pressing the  key decreases the number. Measure the
DC voltage between pins 1 and 2 (4-pin connector) on the
controller. Change the CONTROL OUT value about 40%.
The voltage output should change approximately 4 volts.
Change the CONTROL OUT value to 50% OPEN. The
voltage should read approximately 5 VDC.

If no change occurs, disconnect control wires on pins 1
and 2 (4-pin connector) and repeat test. If DIM still fails to
change voltage output, DIM is probably defective. If
voltage changed DIM is working, and either wiring or
actuator (VFD) needs to be examined.

Part Two

65

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Controller is not
controlling.

(continued)

Bad actuator or
valve (damper or
valve linkage
does not move).

Go into DIAGNOSTICS menu, CONTROL OUT item. A
number between 0% OPEN and 100% OPEN will be
displayed. Pressing the  key increases the number.
Pressing the  key decreases the number. Change the
CONTROL OUT value to read 0% OPEN or 100% OPEN.
Note damper/valve position. Press an arrow key to
change 0% OPEN to 100% OPEN or 100% OPEN to 0%
OPEN. Note position of damper/valve. Damper should
have rotated 90 degrees (or valve linkage moved full
stroke). If damper rotated 90 degrees (or valve linkage
moved full stroke), actuator is installed and operating
correctly.

If damper/valve did not move, check that:

 Damper/valve is not physically stuck (screws, etc.).
 Wiring is correct between actuators and controller.

Check that voltage varies between 0 and 10 volts on
pins 5 and 6 on electric actuator (see No control

output signal).

Electric actuator is not over torqued. The electric actuator
has current limiting protection. If damper is physically
stuck or actuator is over current, the actuator will shut
down. To restart either kill power to actuator or move
damper/valve in opposite direction (CONTROL OUT
menu item).

Defective
variable
frequency drive
(VFD).

Perform test described in Control system is not

controlling. If CONTROL OUT is functioning, verify wiring

to VFD by confirming CONTROL OUT voltage changes at
VFD. If voltage changes, a problem with VFD exists. See
VFD manual for further troubleshooting.

Damper/Valve is
full open or full
closed, will not
move.

Control wires are loose. Check wires and verify control
output is working (see No control output signal). If control
output test passes, verify damper/valve is moving correct
direction (see Damper/Valve moving opposite direction). If
damper/valve is moving correctly and set point cannot be
reached, DIM will fully move damper/valve to get as close
to set point as possible. Fume hood exhaust; fan, static
pressure, etc. needs to be adjusted.

. Controller not

calibrated.

Calibrate controller. Controller is not calibrated leaving the
factory; it must be field calibrated.

Technical Section

66

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

“Check the
Sensor Cable”
flashing on
display.

Poor sensor
connections.

Verify the sensor cable is correctly plugged into the DIM
and sensor. Connector is polarized but can be forced on
backwards.

Defective sensor.

Disconnect the velocity sensor cable from the back of
DIM. Depress the latching piece on the connector to pull it
out. Use an ohm meter to measure the resistance
between the sensor connections indicated in figure below.
The resistance between pins 3 and 4 should be between
10 and 12.5 ohms. The resistance between pins 2 and 4
should be between 120 and 140 ohms. If resistance does
not measure correctly, verify that sensor cable is good.

Figure 6: Velocity Sensor

Defective sensor
cable.

Verify wire is terminated the same on both ends of cable.
Confirm wire colors match pin 1 to 1, pin 2 to 2, etc. Test
sensor cable with an Ohmmeter to ensure that cable
terminations are good.

Excessive face
velocity.

Confirm the fume hood face velocity is over 1000 ft/min. If
face velocity exceeds 1,000 ft/min, exhaust system needs
balancing.

Controller not
calibrated.

Calibrate controller.

Remote
emergency does
not work.

Incorrect wiring
or defective
switch.

Disconnect emergency remote wires from DIM. Verify
wiring with an Ohmmeter by switching the emergency
switch open and closed. If operational, reconnect to DIM.

Defective
controller.

Verify wiring and switch are good. Enter DIAGNOSTICS

menu IN# EMERG PURGE item. Display will indicate

OPEN or CLOSED. Toggle the remote emergency switch,
and the display should change between OPEN and
CLOSED. If no change, replace DIM.

Remote setback
does not work.

Incorrect wiring
or defective
switch.

Disconnect remote wires from DIM. Verify wiring with an
Ohmmeter by switching the setback switch open and
closed. If operational, reconnect to DIM.

Defective DIM.

Verify wiring and switch are good. Enter DIAGNOSTICS

menu IN# NIGHT SETB item. Display will indicate OPEN

or CLOSED. Toggle the remote setback switch, and
display should change between OPEN and CLOSED. If
no change, replace DIM.

Part Two

67

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

DIM does not
respond to
network
communications/

Network protocol
is incorrect.

Go into INTERFACE menu, NET PROTOCOL item. The
protocol must match host system. Select correct interface.

Incorrect network
address.

The network address at the building automation system
and at the DIM must match. The network address must
be unique for each DIM.

Incorrect polarity.

Verify and/or change polarity of RS-485 A and B wires.

Incompatible
software.

Data sent to DIM may be in form that the controller cannot
recognize.

LonWorks® or
BACnet

®

board

not installed.

Contact factory for further assistance.

Bad LonWorks®
or BACnet

®

board.

Contact factory for assistance.

Foreign network
acquired
controller.
(LonWorks® only)

Go into CONFIGURE menu, LON item. Select GO

UNCONFIG option, press the SELECT key. Return to the
LON item, select the SERVICE PIN option and press the
SELECT key. Selecting GO UNCONFIG will reset the

FHC50’s authentication key, allowing the SERVICE PIN
to install or reclaim the FHC50 to the LonWorks® network.

Alarm relays do
not work.

Alarms are
turned off.

Enter the Set Points menu. Verify that the alarm that is
supposed to trigger the relay is not set to 0 (OFF). If the
alarm set point is zero, alarm relay is not active, so relay
will not be required to change state.

Incorrect wiring.

Check the wiring from DIM relay's output to the device
that is connected to the relays.

Relay may be
defective.

Disconnect the wiring (6-pin connector) from relay contact
pins 1 and 2 for low alarm relay and pins 3 and 4 for relay

“B”. Go into DIAGNOSTICS menu, ALARM RELAY A or
ALARM RELAY B. Connect an ohm-meter to relay

terminals to verify contact open and closes. Press the
/ key to manually trip the relay. If relay responds
(contact opens and closes), the device connected is
incompatible or defective. If relay does not respond, relay
is defective (may be caused by incompatible device).
Replace DIM.

Technical Section

68

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Actuator hunting.
Display indicates
steady velocity.

Control system is
unstable.

Go into CONTROL menu, SPEED item. Turn speed down
until hunting is eliminated. If speed is too slow see
manual section: Optimizing Controller Performance and
adjust accordingly to eliminate problem.

Displayed
velocity wildly
fluctuating.

Exhaust system
unstable.

Turn DIM to emergency if using a Model FHC50
controller. If velocity stabilizes, exhaust system is not
unstable.

Laboratory
supply air is
affecting the
sensor.

Check location of supply air diffusers. They should be
located as far from the velocity sensor as is realistic, 10
feet preferred, 6 feet minimum. Supply diffuser terminal
throw velocity must be less than 50% of the average
controlled face velocity. Velocity in the fume hood chase
(back side of sensor) should be less than 25% of the
average controlled face velocity. The supply diffuser must
be relocated if these parameters cannot be met.

Display
averaging is very
short.

Lengthen the time constant by entering the

CONFIGURATION menu, DISPLAY AVG item, and

increase the average time.

Controller needs
calibration.

Calibrate controller.

Analog output
does not work
properly.

Controller is
connected to
incompatible
equipment.

Enter the DIAGNOSTICS menu, ANALOG OUT item. A
number is displayed. Connect a voltmeter to pins 5 and 6
(6 pin connector). Pressing the  key increases the
displayed number and increases the voltage (current)
output. Pressing the  key decreases the number and
decreases the voltage (current) output. If no change
occurs, disconnect the analog out device and repeat
above procedure. If voltage now changes, the controller is
good, and the external device is defective. If no change
occurs, DIM is defective.

Displayed
velocity does not
match measured
velocity.

Velocity sensor is
dirty.

See Maintenance and Repair Parts.
Controller is not

calibrated.

See Calibration.

Velocity sensor is
not referenced to
room air.

The velocity sensor must reference air from the same
space as the fume hood space. If fume hood cabinet
extends above to the ceiling, a Model 8691 Sensor
Venting Kit must be installed.

Display does not
read zero flow at
zero flow.

Controller is not
calibrated.

See Calibration.

Velocity sensor is
not referenced to
room air.

The velocity sensor must reference air from the same
space as the fume hood space. If fume hood cabinet
extends above to the ceiling, a Model 8691 Sensor
Venting Kit must be installed.

Part Two

69

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Caution light on

continuously.
Display indicates
steady velocity.

Monitor/controller
is in setback
mode.

Display will read SETBACK. Press SETBACK key, and
control should return to normal.
Monitor/controller
is muted.

Display will read Mute. Press Mute key to return to
normal function.

“Flow Calibration
Required” on the

display

Flow
measurement
needs calibration,

Calibrate flow using instructions in Calibration section.

“Cannot
Measure Flow”

on the display

Low pressure
drop across
venturi valve with
feedback.

Verify venturi valve pressure drop with a micromanometer
like TSI DP-Calc™ Model 5825. Adjust fan or other flows
to provide sufficient duct static pressure.

No power to
venturi valve
feedback module.

Verify 24 VAC power provided to venturi valve feedback
module.

Sash sensor not
connected or
malfunctioned.

Enter DIAGNOSTICS menu and view menu item
IN1 SASH POS VER. Sash input should be at minimum
(maximum) when sash(es) are open and maximum
(minimum) when sash(es) are closed.

“The

configuration is
not supported.
Reconfiguration

is required.” on

the display.

Incorrect
configuration.

Run Configuration Wizard to correct configuration.

“LON
OVERRIDE ON”

on the display
BAS

Communications
have taken
control of FHC50.

Release control at BMS to clear.
WARNING: Adequate face velocity may not be

maintained while LON overrides the
control signal.

“EMERGENCY”

on the display.

Unit put into
Emergency
mode.

Verify chemical spill or other reason
Emergency mode was enabled has been
resolved. Exit Emergency Mode by pressing:

“Check the Sash
Pot” on the

display.

Sash Sensor
slipped.

Reconnect sash sensor to fume hood sash cable and
recalibrate sash sensor.

Technical Section

70

Troubleshooting Chart

Symptom

Possible Cause

Corrective Action

Error message
on display.

Internal error in
monitor or
controller.

Clear error using Self_Test item in DIAGNOSTICS menu.
If error recurs, return unit to factory.

Error messages:

 ADC Read Error
 Interrupt Fail Error
 Data C Checksum Error
 Data U Checksum Error
 I2C FRAM Write Error
 Flow Setup Data Error
 Control Calib Data Error
 AOut Calib Data Error
 AIn Calib Data Error
 Configuration Data Error
 Meter ID Data Error
 FRAM RD Meter ID Error
 FRAM RD User Config Error
 FRAM Rd Meas Cals Error FRAM

Rd Control Cal Error

 FRAM Rd Aout Cal Error
 FRAM Rd Ain Cal Error
 FRAM Rd Stored Errs Error
 FRAM Wr Stored Errs Error
 FRAM Wr Clear Errs Error
 FRAM Wr Changed Data Error
 FRAM Wr Clear FRAM Error
 Flow Calib Data Error
 Sash Position Calib Error
 Sash Sensor Calib Error
 Sash Area Calib Error
 Vel Calib Data Error

Part Two

Digital Interface Module

Display

Range ........................................

0 to 1,000 ft/min (0 to 5.08 m/s)
0 to 10,000 cfm (0 to 4,720 l/s, 0 to 16,990 m3/hr)

Resolution .................................

1 ft/min (0.01 m/s)
1 cfm (1 l/s, 1 m3/hr)

Inputs

Type ...........................................

Three (3) Total
Choice of: Sash Position, Sash Contact, Setback In,
Emergency In

Signal .........................................

Sash Position: 0-10,000 
Sash Contact, Setback In, Emergency In: SPST (N.O.)
Switch. Closing switch initiates condition.

Flow Input ..................................

0 to 10VDC
Pressure-based flow station, linear flow station or
venturi valve with feedback

Outputs

Analog Output Type ...................

0 to 10 VDC or 4 to 20 mA

Range ........................................

0 to configurable maximum representing face velocity, flow or
sash position

Alarm Contacts ..........................

SPST, 60 W max
2A @ 30 VDC Nominal
Contacts field-configurable to open or close in alarm
condition.
Contacts close on loss of power.

Low Alarm Range ......................

5 to 980 ft/min (0.03 to 4.88 m/s)
0 to 10,000 cfm (0 to 4,720 l/s, 0 to 16,990 m3/hr)

High Alarm Range .....................

80 to 1,000 ft/min (0.41 to 5.08 m/s)
0 to 10,000 cfm (0 to 4,720 l/s, 0 to 16,990 m3/hr)

Communications Protocols ........

Modbus® RTU or N2 (standard) 9600 baud
BACnet® MS/TP (Optional) 76.8k, 38.4k 19.2k,9600 baud)
LonWorks® (Optional)

Operating Temperature .............

32 to 120°F (0 to 48.9C)

Input Power ................................

24 VAC, 50/60 Hz
15 to 40 VDC
5 Watt maximum (50 VA with TSI Actuator)

Dimensions ................................

6.67 in x 2.92 in x 1.25 in (169 mm x 74 mm x 32 mm)

Weight ........................................

0.5 lb (0.2 kg)

Appendix A

Specifications*

71

72

Velocity Sensor

Range ........................................

0 to 1,000 ft/min (0 to 5.08 m/s)

Resolution ..................................

1 ft/min (0.00508 m/s)

Temperature Compensation

Range ........................................

55 to 95°F

Power Dissipation ......................

0.09 watts at 0 ft/min. (0 m/s)

0.14 watts at 100 ft/min. (0.508 m/s)

Dimensions (D x H) ...................

2.75 in.  1.25 in. (70 mm  32 mm)

Weight ........................................

0.2 lb (0.1 kg)

Sensor Cable Specifications .....

4-conductor, 22 AWG, 4-pin polarized at both ends with a
standard length of 6 ft (a maximum length of 10 ft).

Vertical Sash Sensor

Cable Type ................................

Nylon-coated stainless steel

Maximum Retraction ..................

50 in. (1,270 mm)

Resistance .................................

0 to 10,000 

Electrical Cable ..........................

2-conductor, 24 AWG
12 ft (3.6 m)

Dimensions ................................

2.0 in  3.5 in  3.1 in (51 mm  88 mm  79 mm)

Damper/Actuator

Types of Actuator ......................

Electric

Input Power ................................

Electric: 24 VAC, 50 VA max

Time for 90° Rotation .................

1.5 sec.

*Specifications are subject to change without notice.

Appendix A

Appendix B

Network Communications

Network communications are available on the Model FHC50. The Model FHC50 can
communicate with a building management system through Modbus®, N2, LonWorks® or BACnet®
MS/TP protocols. Please refer to the appropriate section below for more detailed information.

Modbus® Communications

Modbus® communications are installed in the Model FHC50 fume hood controllers. This
document provides the technical information needed to communicate between the host DDC
system and the Model FHC50 units. This document assumes the programmer is familiar with
Modbus® protocol. Further technical assistance is available from TSI if your question is related to
TSI interfacing to a DDC system. If you need further information regarding Modbus®
programming in general, please contact:

Modicon Incorporated (a division of Schneider-Electric)
One High Street
North Andover, MA 01845
Phone [phone]

The Modbus® protocol utilizes the RTU format for data transfer and Error Checking. Check the
Modicon Modbus® Protocol Reference Guide (PI-Mbus-300) for more information on CRC
generation and message structures.

The messages are sent at 9600 baud with no start bit, 8 data bits, and 2 stop bits. Do not use the
parity bit. The system is set up as a master slave network. The TSI units act as slaves and
respond to messages when their correct address is polled.

Blocks of data can be read from each device. Using a block format will speed up the time for the
data transfer. The size of the blocks is limited to 255 bytes. This means the maximum message
length that can be transferred is 255 bytes. The typical response time of the device is around

0.05 seconds with a maximum of 0.1 seconds.

Unique to TSI

The list of variable addresses shown below skips some numbers in the sequence due to internal
Model FHC50 functions. This information is not useful to the DDC system and is therefore
deleted. Skipping numbers in the sequence will not cause any communication problems. If a
variable is not used by the particular FHC50 configuration, it will be reported with a value of -1.

All variables are outputted in English units: ft/min, and cfm. If the DDC system is to display
different units, the DDC system needs to make the conversion.

Network Points

These variables can be read using Modbus® command 03 Read Holding Registers. They can
be written to using Modbus® command 06 Write Single Register. Many of these variables are
the same “menu items” that are configured from the controller keypad. The calibration and control
items are not accessible from the DDC system. This is for safety reasons since each hood is
individually setup for maximum performance.

Modbus is a registered trademark of Modicon, Inc.

73

Feature

Holding
Register
(Decimal)

Range

Unit

Read /
Write

Notes

Face Velocity

40001

0 to 1000

fpm R

Current Face
Velocity Setpoint

40002

0 to 1000

fpm

R

Flow Rate

40003

0 to 10000

cfm R

Current Flow Rate
Setpoint

40004

0 to 10000

cfm

R

Damper or Valve
Position

40005

0 to 100

%

R

Sash Position
Percent

40006

0 to 100

%

R

Sash Open Area

40007

0 to 1000

ft2 * 100

R

Low Velocity Alarm
Status

40008

0, 1

0: Inactive
1: Active

R

High Velocity Alarm
Status

40009

0, 1

0: Inactive
1: Active

R

Low Flow Alarm
Status

40010

0, 1

0: Inactive
1: Active

R

High Flow Alarm
Status

40011

0, 1

0: Inactive
1: Active

R

High Sash Position
Alarm Status

40012

0, 1

0: Inactive
1: Active

R

Velocity Sensor
Error Status

40013

0, 1

0: Inactive
1: Active

R Data Error Status

40014

0,1

0: Inactive
1: Active

R Setback Status

40015

0, 1

0: Inactive
1: Active

R Emergency Status

40016

0, 1

0: Inactive
1: Active

R

Normal Face
Velocity Setpoint

40021

60 to 1000

fpm

R/W

Setback Face
Velocity Setpoint

40022

60 to 1000

fpm

R/W

Normal Low Face
Velocity Alarm
Setpoint

40023

5 to 980

fpm

R/W

Normal High Face
Velocity Alarm
Setpoint

40024

80 to 1000

fpm

R/W

Setback Low Face
Velocity Alarm
Setpoint

40025

5 to 945

fpm

R/W

Setback High Face
Velocity Alarm
Setpoint

40026

50 to 1000

fpm

R/W

Normal Flow
Setpoint

40027

0 to 10000

cfm

R/W

Setback Flow
Setpoint

40028

0 to 10000

cfm

R/W

Min Flow Setpoint

40029

0 to 10000

cfm

R/W

Max Flow Setpoint

40030

0 to 10000

cfm

R/W

Modbus Communications (continued)

FHC50 Variable List

74 Appendix B

Feature

Holding
Register
(Decimal)

Range

Unit

Read /
Write

Notes

Normal Low Flow
Alarm Setpoint

40031

0 to 10000

cfm

R/W

Normal High Flow
Alarm Setpoint

40032

0 to 10000

cfm

R/W

Setback Low Flow
Alarm Setpoint

40033

0 to 10000

cfm

R/W

Setback High Flow
Alarm Setpoint

40034

0 to 10000

cfm

R/W

Min Damper Position

40035

0 to 100

%

R/W

Max Damper
Position

40036

0 to 100

%

R/W

Setback Damper
Position Setpoint

40037

0 to 100

%

R/W

High Sash Position
Alarm Setpoint

40038

0 to 105

%

R/W

Units Value

40041

0, 1, 2

0: FPM, cfm
1: m/s & m3/h
2: m/s & l/s

R/W

For display only

Display Averaging

40042

0 to 7

0: 0.5 sec avg
1: 1 sec avg
2: 2 sec avg
3: 3 sec avg
4: 5 sec avg
5: 10 sec avg
6: 20 sec avg
7: 40 sec avg

R/W
Emergency Mode

40043

0, 1

0: Exit Emergency

Mode

1: Enter Emergency

Mode

W Setback Mode

40044

0, 1

0: Exit Setback

Mode

1: Enter Setback

Mode

W
Not Used

40045

N/A

N/A

R/W

Not used on
standard
configuration.

Not Used

40046

N/A

N/A

R/W

Not used on
standard
configuration.

Mute Timeout

40047

1 to 120

Minutes

R/W

0: Permanent Mute

Not Used

40048

N/A

N/A

R/W

Not used on
standard
configuration.

Not Used

40049

N/A

N/A

R/W

Not used on
standard
configuration.

Not Used

40050

N/A

N/A

R/W

Not used on
standard
configuration.

Alarm Reset

40051

0, 1

0: Unlatched
1: Latched

R/W

Modbus Communications (continued)

Network/Modbus® Communications 75

Feature

Holding
Register
(Decimal)

Range

Unit

Read /
Write

Notes

Not Used

40052

N/A

N/A

R

Not used on
standard
configuration.

Not Used

40053

N/A

N/A

R/W

Not used on
standard
configuration.

Setback Control
Mode

40054

0, 1

0: Velocity

Sidewall Sensor

1: Face Velocity

Sash Position

2: Velocity

Sidewall Sensor
with Sash
Position

3: Flow
4: Fixed Position

R/W

Alarm Delay

40055

5-120

Seconds

R/W

Modbus Communications (continued)

EXAMPLE of 06 Write Single Register function format:
This example changes the normal low face velocity alarm set point to 60 ft/min.

QUERY RESPONSE
Field Name (Hex) Field Name (Hex)
Slave Address 01 Slave Address 01
Function 06 Function 06
Starting Address Hi 00 Starting Address Hi 00
Starting Address Lo 16 Starting Address Lo 16
Data Value (High) 00 Error Check (CRC) -­Data Value (Low) 3C
Error Check (CRC) --

EXAMPLE of 03 Read Holding Registers function format:
This example reads the face velocity and current face velocity set point.

QUERY RESPONSE
Field Name (Hex) Field Name (Hex)
Slave Address 01 Slave Address 01
Function 03 Function 03
Starting Address Hi 00 Byte Count 04
Starting Address Lo 00 Data Hi 00
No. Of Registers Hi 00 Data Lo 64 (100 ft/min)
No. Of Registers Lo 02 Data Hi 00
Error Check (CRC) -- Data Lo 64 (100 ft/min)
Error Check (CRC)

76 Appendix B

Variable

Description

NPT - Network
Point Type

Variables are defined as analog inputs, binary inputs, and analog outputs.
Analog inputs are current control parameters and items that the controller is
measuring. Binary inputs represent controller states. Analog outputs are the
programmable set points for the Fume Hood Controller. These set points can
be changed through the keypad or by over-writing the current set point.

NPA - Network Point
Address

Address of the desired point.

Change of Status
(COS) - Face Velocity
Analog Input

The FHC50 has the ability to change control set points locally. The alarm set
points need to be based on the controllers control set point (AI #2). The unit can
be changed from Normal Mode to Setback Mode. For example the set point
could go from 100 ft/min to 60 ft/min when the Setback key is pressed. If the
COS alarm set points are not changed to accommodate you could get low
alarm or low warning messages when the unit is working correctly. If these
alarm points are set outside of the setback and main velocity set point values,
incorrect alarm messages can be prevented.

Override Analog
Input Command

The Damper Position Analog Input value can be set using the override
command. This value will be reset to the correct item when the Override is
released. There is not a time-out on the override command.

Other Analog Input values cannot be Overridden.

Override Binary
Input Command

Overriding a 1 to the Setback or Emergency binary inputs enables the
respective mode. To return the controller to normal mode from setback mode,
press the Setback key on the controller, toggle the setback contact input, or
release the override. To release controller from emergency state, override a 0
to the Emergency input, toggle the emergency contact input, or press either
the emergency or reset key. Releasing the override will return the controller to
the state it was in previous to the emergency, either Normal or Setback.

The alarm, data error, and sensor error variables can be overridden, but this
will not affect the controller. Overriding the low alarm variable will result in a
change of status, but will not put the controller into low alarm mode. The local
alarm modes can only be controlled locally. Only override these variables for
diagnostic purposes, and release them for normal operation.

Binary Inputs, Sensor
Error and Data Error

Sensor Error and Data Error binary inputs are used to indicate if something
has gone wrong with the controller. The Sensor Error is set when the sensor
on the controller has a malfunction. This indicates that service should be done
on the controller. Data Error indicates when some of the data stored on the
device has been corrupted. The calibration and set point values should be
checked on the controller.

Override Analog
Output Command

The analog output variables can be overridden to change their values. The
overridden value will be checked for validity. If invalid, the override command
will be ignored, and the value will not change. The override flag will not be set
when the value is ignored. The override command will be cleared when the
variable is reset in the menus. The variable will not reset with the release
command.

N2 Communications

Description of Variables

Description of Variables

N2 Communications Description of Variables 77

Command

Response

Request Device ID

Returns 0x10

Synchronize Time Command

Acknowledged. There is no internal clock to synchronize.

Poll without/With Ack Message

Any change of status is returned

Read Analog Input Command

Variable value

Read Binary Input Command

Variable value

Read Analog Output Command

Variable Value

Write Analog Input

Acknowledge

Write Binary Input

Acknowledge

Write Analog Output

Acknowledge

Override Analog Input Command

Acknowledge

Override Binary Input Command

Acknowledge

Override Analog Output Command

Acknowledge

Override Release Request

Acknowledge

Identify Device Type Command

Returns 0x10H

NPT

NPA

Feature

Unit

AI

1

Face Velocity

fpm, m/s

AI

2

Current Face Velocity Setpoint

fpm, m/s

AI

3

Flow Rate

cfm or L/s

AI

4

Current Flow Rate Setpoint

cfm or L/s

AI

5

Sash Position Percent

%

AI

6

Sash Open Area

ft2 or m2

AI

7

Damper or Valve Position

%

AO

1

Normal Face Velocity Setpoint

fpm, m/s

AO

2

Setback Face Velocity Setpoint

fpm, m/s

AO

3

Min. Damper Position

%

AO

4

Max. Damper Position

%

AO

5

Normal Flow Setpoint

cfm or L/s

AO

6

Setback Flow Setpoint

cfm or L/s

AO

7

Minimum Flow Setpoint

cfm or L/s

AO

8

Maximum Flow Setpoint

cfm or L/s

AO

9

Normal Low Face Velocity Alarm Setpoint

fpm, m/s

AO

10

Normal High Face Velocity Alarm Setpoint

fpm, m/s

AO

11

Normal Low Flow Alarm Setpoint

cfm or L/s

AO

12

Normal High Flow Alarm Setpoint

cfm or L/s

AO

13

Setback Low Face Velocity Alarm Setpoint

fpm, m/s

AO

14

Setback High Face Velocity Alarm Setpoint

fpm, m/s

AO

15

Setback Low Flow Alarm Setpoint

cfm or L/s

Supported Commands

Note: Poll Without/With Ack Message will need to be sent twice in order to receive all of the possible

change of status variables.

Variable Map

78 Appendix B

NPT

NPA

Feature

Unit

AO

16

Setback High Flow Alarm Setpoint

cfm or L/s

AO

17

Setback Damper Position Setpoint

%

AO

18

High Sash Position Alarm Setpoint

%

AO

19

Units Value

0: English Units (fpm, cfm)
1: Metric Units (m/s, m3/h)
2: Metric Units (m/s, l/s)

BI

1

Low Velocity Alarm Status

0: Inactive
1: Active

BI

2

High Velocity Alarm Status

0: Inactive
1: Active

BI

3

Low Flow Alarm Status

0: Inactive

1: Active

BI

4

High Flow Alarm Status

0: Inactive
1: Active

BI

5

High Sash Position Alarm Status

0: Inactive
1: Active

BI

6

Velocity Sensor Error Status

0: Inactive
1: Active

BI

7

Data Error Status

0: Inactive
1: Active

BI

8

Setback Status

0: Inactive
1: Active

BI

9

Emergency Status

0: Inactive
1: Active

* Not available on standard Model FHC50s.
** The units of the variables are based on the units variable. When the units variable is set to 0 the values are in

English form. When the units variable is set to 1or 2 the units are metric. English is the default units.

N2 Communications Description of Variables 79

80

SNVT

Number

Bit

Description

SNVT Name

SNVT Type

4

nviRequest

SNVT_obj_request

5

nviSetTime

SNVT_time_stamp

6

nvoStatus

SNVT_obj_status

7

nvoAlarm

SNVT_alarm

1

AL_LOW_LMT_1
Low Face Velocity Alarm

2

AL_HIGH_LMT_1
High Face Velocity Alarm

3

AL_LOW_LMT_2
Low Exhaust Flow Alarm

4

AL_HIGH_LMT_2
High Exhaust Flow Alarm

5

AL_ALM_CONDITION
Sash Alarm

SNVT

Number

Bit

Description

SNVT Name

SNVT Type

15

Setback Mode

nviControlMode

SNVT_occupancy

16

Emergency Mode

nviEmergency

SNVT_hvac_emerg

17

Remote Control Override

nviOverrideOn

SNVT_switch

18

Face Velocity

nvoFaceVelocity

SNVT_speed_mil

19

Flow Rate.

nvoExhaust Flow

SNVT_flow

20

Damper or Valve Position

nvoControlPos

SNVT_lev_percent

21

Sash Position Percent.

nvoSashPosPcnt

SNVT_lev_percent

22

Sash Open Area.

nvoSashOpenArea

SNVT_area

23

Status

nvoUnitState

SNVT_state

0

Setback Status

1

Low Velocity Alarm Status

2

High Velocity Alarm Status

3

Low Flow Alarm Status

4

High Flow Alarm Status

5

High Sash Position Alarm Status

6

Velocity Sensor Error Status

7

Data Error Status

8

Emergency Status

9

Remote Control Override Status

24

Normal Face Velocity Setpoint

nvoNormFVSetp

SNVT_speed_mil

LonWorks® Object

Node Object Network Variables

Fume Hood Controller Object Network Variables

Appendix B

SNVT

Number

Bit

Description

SNVT Name

SNVT Type

25

Setback Face Velocity Setpoint

nvoSetbFVSetp

SNVT_speed_mil

26

Normal Low Face Velocity Alarm
Setpoint

nvoNormLoFVAlmSetp

SNVT_speed_mil

27

Normal High Face Velocity Alarm
Setpoint

nvoNormHiFVAlmSetp

SNVT_speed_mil

28

Setback Low Face Velocity Alarm
Setpoint

nvoSbLoFVAlmSetp

SNVT_speed_mil

29

Setback High Face Velocity Alarm
Setpoint

nvoSbHiFVAlmSetp

SNVT_speed_mil

30

Normal Flow Setpoint

nvoNormFlowSetp

SNVT_flow

31

Setback Flow Setpoint

nvoSetbFlowSetp

SNVT_flow

32

Normal Low Flow Alarm Setpoint

nvoNmLoFloAlSetp

SNVT_flow

33

Normal High Flow Alarm Setpoint

nvoNmHiFloAlSetp

SNVT_flow

34

Setback Low Flow Alarm Setpoint

nvoSbLoFloAlSetp

SNVT_flow

35

Setback High Flow Alarm Setpoint

nvoSbHiFloAlSetp

SNVT_flow

36

Minimum Flow Setpoint

nvoMinFlowSetp

SNVT_flow

37

Maximum Flow Setpoint

nvoMaxFlowSetp

SNVT_flow

38

Minimum Damper Setpoint

nvoMinDampSp

SNVT_lev_percent

39

Maximum Damper Setpoint

nvoMaxDampSp

SNVT_lev_percent

40

Setback Damper Position Setpoint

nvoSetbCtrlPos

SNVT_lev_cont

41

High Sash Position Alarm Setpoint

nvoHiSashAlmPos

SNVT_lev_cont

nciMaxSendTime

nciMinSendTime

nciSndDeltaFlow

nciSndDeltaSpeed

nciSndDeltaPos

LonWorks® Object 81

82

SNVT

Command Supported

Action

nviEmergency:

EMERG_NORMAL

Sets NORMAL mode

EMERG_PURGE

Sets EMERGENCY mode

NOTE: All other commands set NORMAL mode

SNVT

Command Supported

Action

nviControlMode:

OC_OCCUPIED

Sets NORMAL mode

OC_STANDBY
OC_UNOCCUPIED

Sets SETBACK mode
Sets SETBACK mode

NOTE: All other commands set NORMAL mode

SNVT

Command Supported

Action

nviRequest

CLEAR_ALARM

Clears alarm (See SNVT nvoAlarm)

object_request

SNVT

Value Sent

Action

nviOverrideOn

x.x 1
x.x 0

Moves damper to override position
Exit Override mode
x.x is damper position between 0.0 to 100.0

Description of LON SNVTs

Appendix B

FHC50 BACnet® MS/TP Protocol Implementation Conformance

Statement

Date: April 7, 2010
Vendor Name: TSI Inc.
Product Name: Fume Hood Controller
Product Model Number: FHC50-BAC
Applications Software Version: 1.0
Firmware Revision: 1.0
BACnet Protocol Revision: 2

Product Description:

TSI's Fume Hood Fume Hood Controller provides a closed-loop VAV control system for proper lab hood
containment. controller assures safety by responding quickly during sash movement, or to disturbances
within the sash plane, to maintain a constant face velocity and contain hazardous chemicals. The
controller provides opportunities for energy savings, lower fan brake horsepower, smaller chillers and
lower duct work cost by reducing the volume of air exhausted from a hood when the sash is not fully
open. This model controller is capable of acting as a stand-alone device or as part of a building
automation system via BACnet® MS/TP protocol.

BACnet Standardized Device Profile (Annex L):

 BACnet Operator Workstation (B-OWS)
 BACnet Building Controller (B-BC)
 BACnet Advanced Application Controller (B-AAC)
 BACnet Application Specific Controller (B-ASC)
 BACnet Smart Sensor (B-SS)
 BACnet Smart Actuator (B-SA)

List all BACnet Interoperability Building Blocks Supported (Annex K):
DS-RP-B DM-DDB-B

DS-WP-B DM-DOB-B
DS-RPM-B DM-DCC-B

Segmentation Capability:

Segmented requests not supported
Segmented responses not supported

FHC50 BACnet® MS/TP Protocol Implementation Conformance Statement 83

84

Dynamically
Createable

Dynamically
Deletable

Optional
Properties
Supported

Writable
Properties (Data
Type)

Analog Input

No

No

Analog Value

No

No Present_Value
(Real)

Binary Input

No

No

Active_Text,
Inactive_Text

Binary Value

No

No

Active_Text,
Inactive_Text

Present_Value
(Enumerated)

Multi-state Input

No

No

State_Text

Multi-state Value

No

No

State_Text

Present_Value
(Unsigned Int)

Device Object

No

No Object Name
(Char String)
Max Master

(Unsigned Int)

Standard Object Types Supported:

Data Link Layer Options:

 BACnet IP, (Annex J)
 BACnet IP, (Annex J), Foreign Device
 ISO 8802-3, Ethernet (Clause 7)
 ANSI/ATA 878.1, 2.5 Mb. ARCNET (Clause 8)
 ANSI/ATA 878.1, RS-485 ARCNET (Clause 8), baud rate(s)
 MS/TP master (Clause 9), baud rate(s): 76.8k 38.4k, 19.2k, 9600 bps
 MS/TP slave (Clause 9), baud rate(s):
 Point-To-Point, EIA 232 (Clause 10), baud rate(s):
 Point-To-Point, modem, (Clause 10), baud rate(s):
 LonTalk, (Clause 11), medium:
 Other:

Device Address Binding:

Is static device binding supported? (This is currently necessary for two-way communication with MS/TP
slaves and certain other devices.) Yes  No

Networking Options:

 Router, Clause 6 - List all routing configurations, e.g., ARCNET-Ethernet, Ethernet-MS/TP, etc.
 Annex H, BACnet Tunneling Router over IP
 BACnet/IP Broadcast Management Device (BBMD)

Character Sets Supported:

Indicating support for multiple character sets does not imply that they can all be supported
simultaneously.

 ANSI X3.4  IBM®/Microsoft® DBCS  ISO 8859-1
 ISO 10646 (UCS-2)  ISO 10646 (UCS-4)  JIS C 6226

If this product is a communication gateway, describe the types of non-BACnet®
equipment/networks(s) that the gateway supports:

Not Applicable

Appendix B

Feature

Object

Type

Device

Instance

Units

Range

Read/

Write

Notes

Face Velocity

Analog

Input

1

fpm

0 to 1000

R

m/s

0 to 5.08

Flow Rate

Analog

Input

2

cfm

0 to 10000

R

m3/h

0 to 16990

l/s

0 to 4719

Damper or Valve
Position

Analog

Input

3 % 0 to 100

R

Sash Position
Percent

Analog

Input

4 % 0 to 100

R

Sash Open Area

Analog

Input

5

ft2

0 to 1000

R

m2

0 to 93

MAC Address

Analog

Value

1 - 1 to 127

R/W

Communications
will be lost until
front-end updated
with new MAC
Address

MAC ID**
(1st 4 digits)

Analog

Value

2

N/A

1 to 4,194

R/W

Normal Face
Velocity Setpoint

Analog

Value

3

fpm

0, 60 to 1000

R/W

m/s

0, 0.03 to 5.08

Setback Face
Velocity Setpoint

Analog

Value

4

fpm

0, 60 to 1000

R/W

m/s

0, 0.03 to 5.08

Normal Low Face
Velocity Alarm
Setpoint

Analog

Value

5

fpm

0, 5 to 980

R/W

m/s

0, 0.03 to 4.98

Normal High
Face Velocity
Alarm Setpoint

Analog

Value

6

fpm

0, 80 to 1000

R/W

m/s

0, 0.42 to 5.08

Setback Low
Face Velocity
Alarm Setpoint

Analog

Value

7

fpm

0, 5 to 980

R/W

m/s

0, 0.03 to 4.98

Setback High
Face Velocity
Alarm Setpoint

Analog

Value

8

fpm

0, 80 to 1000

R/W

m/s

0, 0.42 to 5.08

Normal Flow
Setpoint

Analog

Value

9

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Setback Flow
Setpoint

Analog

Value

10

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Normal Low Flow
Alarm Setpoint

Analog

Value

11

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Normal High
Flow Alarm
Setpoint

Analog

Value

12

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

BACnet

®

MS/TP Object Set

BACnet® MS/TP Object Set 85

86

Feature

Object

Type

Device

Instance

Units

Range

Read/

Write

Notes

Setback Low
Flow Alarm
Setpoint

Analog

Value

13

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Setback High
Flow Alarm
Setpoint

Analog

Value

14

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Min. Damper
Position

Analog

Value

15 % 0 to 100

R/W

Max. Damper
Position

Analog

Value

16 % 0 to 100

R/W

Minimum Flow
Setpoint

Analog

Value

17

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Maximum Flow
Setpoint

Analog

Value

18

cfm

0 to 10000

R/W

m3/h

0 to 16990

l/s

0 to 4719

Setback Damper
Position Setpoint

Analog

Value

19 % 0 to 100

R/W

High Sash
Position Alarm
Setpoint

Analog

Value

20 % 0, 10 to 105

R/W

MAC ID**
(Last 3 digits)

Analog

Value

21

N/A

1 to 999

R/W

Communications
will be lost until
front-end updated
with new MAC
Address

Low Velocity
Alarm Status

Binary

Input

1

0: Inactive

1: Active

0;1

R

High Velocity
Alarm Status

Binary

Input

2

0: Inactive

1: Active

0;1

R

Low Flow Alarm
Status

Binary

Input

3

0: Inactive

1: Active

0;1

R

High Flow Alarm
Status

Binary

Input

4

0: Inactive

1: Active

0;1

R

High Sash
Position Alarm
Status

Binary

Input

5

0: Inactive

1: Active

0;1

R

Velocity Sensor
Error Status

Binary

Input

6

0: Inactive

1: Active

0;1

R

Data Error Status

Binary

Input

7

0: Inactive

1: Active

0;1

R

Setback Status

Binary

Input

8

0: Inactive

1: Active

0;1

R

Emergency
Status

Binary

Input

9

0: Inactive

1: Active

0;1

R

Auto Baud

Multi-State

1

0: No Action

1 Set Auto Baud

0;1

R/W

Controller will
reset variable to
0 after setting
baud rate.

Appendix B

Feature

Object

Type

Device

Instance

Units

Range

Read/

Write

Notes

Emergency Mode

Multi-State

2

1: Exit Emergency

Mode

2: Enter

Emergency Mode

3: Normal

1; 2; 3

R/W

Setback Mode

Multi-State

3

1: Exit Setback

Mode

2: Enter Setback

Mode

3: Normal

1; 2; 3

R/W

Units Value

Multi-State

4

1: fpm and cfm

2: m/s and m3/h

3: m/s & l/s

1; 2; 3

R/W

* The units are based on the value of the Units Value object. When the Units Value is set to 1 the units are in English
form. When the Units Value is set to 2 or 3 the units are metric. English is the default value.

** The device index is the 1st 4 digits of the MAC ID (AV 2) multiplied by 1000 plus the Last 3 Digits of the MAC ID
(AV 21). For example, if the device index is 4,194,302 then the 1st 4 digits of the MAC ID (AV 2) will be 4,194 and the
Last 3 Digits of the MAC ID (AV 21) will be 302.

BACnet® MS/TP Object Set 87

88

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Appendix B

PIN #

Input/Output/
Communication

Description

1, 2

Input

24 VAC to power Digital Interface Module (DIM).

3, 4

Output

0 to 10 VDC fume hood exhaust control signal. See menu item

CONTROL SIG

Not used on fume hood monitor.

5, 6

Communications

LONworks®/BACnet® MS/TP communications (optional)

7, 8, 9

Output

RS-485 communications to building management system (Modbus® or N2)

10, 11

Output

0 to 10 VDC/4 to 20 mA analog output signal. See menu item

ANALOG OUT TYPE.

12, 13

Output

Alarm Relay B. See menu items RELAYS OUT and RELAY SEL B.

14, 15

Output

Alarm Relay A. Low face velocity/flow alarm. See menu item RELAYS

OUT.

16, 17

Input

Non-powered input #1. Accepts sash sensor, sash switch, emergency
switch or night setback switch. See menu item INPUT SEL 1.

18, 19

Input

Non-powered input #2. Accepts sash switch, emergency switch or night
setback switch. See menu item INPUT SEL 2.

20, 21

Input

Non-powered input #3. Accepts sash switch, emergency switch or night
setback switch. See menu item INPUT SEL 3.

22, 23

Input

0 to 10 VDC Flow input. See menu item FLOW DEVICE.

Appendix C

Wiring Information

Back Panel Wiring

89

90

Figure 7: Wiring Diagram—Model FHC50-01 Controller

Appendix C

Figure 8: Wiring Diagram—Model FHC50-02 Controller

Wiring Information 91

92

Figure 9: Wiring Diagram—Model FHC50-03 Controller

Appendix C