TSI/Alnor 335-D User manual

FUME HOOD MONITOR

ALNOR® AIRGARD® 335

OWNER’S MANUAL

P/N 116159255, REV 10

SEPTEMBER 2014

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LIMITATION OF WARRANTY AND LIABILITY

(effective April 2014)

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. Seller does not provide any warranty on finished goods manufactured by others or on any

fuses, batteries or other consumable materials. Only the original manufacturer's warranty

applies;
e. 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.
h. 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 1-800-874-2811 (USA) or [phone].

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TABLE OF CONTENTS

SECTION 1 Introduction ............................................................ 3

General Description ................................................................. 3

Component Identification ......................................................... 4

SECTION 2 Installation .............................................................. 7

Tools Required ......................................................................... 7

Mounting the Monitor ............................................................... 7

Electrical Wiring ....................................................................... 8

SECTION 3 Calibration ............................................................ 11

Overview ................................................................................ 11

Tools Required ................................................................... 11

Procedure ........................................................................... 11

Constant Volume Laboratory Fume Hood Calibration ....... 12

Variable Air Volume (VAV) Laboratory Fume Hoods ......... 13

Variable Air Volume (VAV) Laboratory Fume Hood

Calibration ........................................................................ 15

Calibration Error Codes ...................................................... 16

Low Alarm Setup .................................................................... 18

SECTION 4 Normal Operation ................................................ 19

Power Up Sequence .............................................................. 19

Run Mode ............................................................................... 19

Monitor Test ........................................................................... 20

Horn ....................................................................................... 20

Temporary Horn Disable .................................................... 21

Permanent Horn Disable .................................................... 21

Viewing Alarm Set Points ....................................................... 21

Changing Alarm Set Points .................................................... 21

LED Status When Changing the Alarm Setpoint ............... 22

High Alarm Disable ................................................................ 22

Emergency Purge .................................................................. 22

SECTION 5 Parameter Configuration .................................... 23

General .................................................................................. 23

Configuration Parameters ...................................................... 24

CAL — Calibration .............................................................. 25

P01 — Digits Enabled/Disabled ......................................... 25

P02 — Unit of Measure ...................................................... 26

P03 — Temporary Horn Disable Timer .............................. 26

P04 — Caution-to-Alarm Transition Delay Timer ............... 27

P05 — Alarm-to-Caution Transition Delay Timer ............... 28

P06 — Low Alarm Caution Offset ...................................... 29

P07 — Dis Input ................................................................. 29

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P08 — Alarm Input ............................................................. 32

P09 — Relay Output 1 ....................................................... 35

P10 — Relay Output 2 ....................................................... 37

P11 — High Alarm Relay Disable ...................................... 39

P12 — Night Setback Low Alarm ....................................... 40

dEF — Reset Configuration Parameters to Factory Default

Settings ............................................................................ 40

SECTION 6 Troubleshooting and Service ............................. 42

Error Codes ............................................................................ 42

Troubleshooting Guide ........................................................... 42

Service Requests ................................................................... 44

SECTION 7 Mounting Template .............................................. 45

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SECTION 1

Introduction

General Description

Air is drawn into a fume hood by an exhaust system that
produces a differential pressure between the interior of the fume
hood and the surrounding laboratory. The average velocity of the
air moving perpendicular through the front sash opening of the
hood is called the face velocity. Adequate face velocity is
necessary to protect fume hood users by containing all of the
contaminants inside the fume hood.

The AirGard® 335 continuously monitors fume hood face velocity
by measuring the air velocity of clean air from the room passing
through the air inlet on the front of the monitor. The monitor then
reports this information via audio and visual indicators.

Visual Indicators — An electronic bar graph moves back and
forth through universally recognized red (danger), yellow
(caution) and green (safe) colored zones as the velocity
changes. Corresponding large colored LEDs also illuminate. A
digital display can be enabled to view velocity quantitatively.

Audible Indicator — A continuous audible alarm alerts of a
dangerous situation when the face velocity is in an alarm
condition.

Alarm information can be sent to other personnel in a remote
location by means of a relay output.

IMPORTANT: Fume hoods vary in design and performance.
Because each hood installation and its air flow patterns is
unique, the AirGard 335 Monitor must be calibrated in the field
on the fume hood in which it is installed.

Read this manual entirely before installing, calibrating,
configuring, and using the AirGard® 335. If you need assistance
or any further explanation regarding this instrument, please
contact TSI.

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Component Identification

Analog Bar graph

Status LEDs

(red, yellow and green)

Colored Bands

Digital Display

Up Button

Down Button

Test/Reset
Button

Mounting
Screw

Emergency
Purge Button

Mounting

Screw

Air Inlet

4

Figure 1 — Front View of Instrument

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Status LEDs Red (Alarm) — Indicates a high or

low airflow alarm;
Yellow (Caution) — Indicates that the
airflow is within the caution zone
between normal and low alarm;
Green (Good) — Indicates that the
airflow is within normal range.

Up Button Up scroll button for configuration and

calibration.

Down Button Down scroll button for configuration

and calibration.

Analog Bar graph Electronic bar graph

expands/contracts
through colored zones as the flow
velocity changes.

Colored Bands Red, yellow and green colored bands

on LCD glass correspond to alarm,
caution, and normal zones.

Digital Display Status indicators and icons reflect

the status of monitor features. If
digits are enabled, shows airflow
velocity measurement either in feet
per minute or meters per second.

Test/Reset Button Tests the digital display, LEDs,

audible alarm and relay output or, if
an alarm is present, silences the
audible alarm. It is also is used
during calibration and configuration.

Emergency Purge Button When configured to operate,

activates a relay that can be used to
command the fume hood damper to
open until pressed again.

Air Inlet Guides room air to the sensor.

Mounting Screws Two #6-20 screws secure the

monitor to the fume hood.

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Flow Tube

Terminal Block

Power Jack

Communications

Port

Figure 2—Back View of Instrument

Communications Port For factory use only.

Flow Tube Connects the flexible air hose attached to

the fume hood side wall.

Terminal Block Accepts 14-24 AWG wires. See the

Installation section for wiring the monitor’s
various input/output features.

Power Jack A suitable AC/DC power supply is

supplied with US/Canada units; a 2.1 mm
plug with

1.8 m power cord is provided for other
countries.

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SECTION 2

Installation

Tools Required

1. Power Drill

2. Drill bit size #37 (0.104 inch) (2.6 mm)

3. 9/16 inch (14 mm) diameter hole saw for cutting into side
wall

4. Reciprocating saw with saw blades for cutting sheet metal

5. Pilot drill sized to fit saw blade

6. Phillips head screwdriver with #1 point

7. Small slotted screwdriver for securing wires to terminal
block.

WARNING: If the monitor will be installed on a hood with
Hardiboard™ fiber-cement panels or similar material, use a
special hole saw designed for glass and other hard, abrasive
materials. Failure to do so may shatter or crack the panel.

DANGER: Always wear eye protection when using power tools.
Observe all necessary precautions when installing or repairing
monitors near electrical equipment.

Mounting the Monitor

1. Determine where the monitor will be mounted. Use the
cardboard template supplied as a guide for the size of the
installed product and the hole needed to be cut out of the
hood. The cutout required is 3 inches high by 2 inches wide
(76.2  50.8 mm), which is the typical size required for a
single switch electrical box. If the cardboard template is not
available, a dimensioned diagram is at the back of this
manual (see Section 7).

2. Using the template, mark off the 3 inch high by 2 inch wide
(76.2  50.8 mm) hole necessary to clear the back enclosure
portion of the monitor. Mark off the two mounting screw hole
locations.

3. Drill a pilot hole in each of the four corners. Use the saw to
cut out the hole. A suitable nibbling tool may also be used.

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4. Drill the two #37 (0.104 inch) (2.6 mm) mounting screw
holes.

5. Drill one 9/16 inch (14 mm) diameter hole in the side wall of
the fume hood approximately 6 inches (152 mm) behind the
sash and 1 inch (25.4 mm) above the sash bottom when it is
at its true fully open position. Insert the side wall adapter
from the inside of the hood and securely lock it in place from
the back with the locking ring.

6. Connect the input/output signal wiring, if required, to the
terminal block on the back of the monitor. See the Electrical

Wiring below.

7. Connect one end of the supplied air hose to the side wall
adapter. Route the hose as necessary to avoid kinks and
bends which can affect proper air flow. Trim slightly if
required. Firmly connect the other end to the flow tube on
the back of the monitor.

8. Connect the power cord to the power jack.

9. Screw the monitor to the fume hood with the self-tapping
screws provided.

10. Plug the power supply into an appropriate electrical outlet.

Electrical Wiring

Power Jack — Power is supplied to the monitor through a

power jack located on the back of the monitor. For units shipped
within the United States and Canada, a suitable AC/DC power
supply is supplied with the unit. Plug the power supply into 120
VAC nominal 60 Hz mains.

For monitors shipped outside the US/Canada, a 2.1 mm plug
with a

1.8 m cord is provided. See the Specification section on the

inside back cover for power requirements.

Terminal Block — The monitor has a seven-pin screw terminal
block connector protruding from the back of the monitor. The
terminal block accepts 14-24 AWG wires. These connections are
for input/output features. See the Configuration Parameters
section where indicated. The connections available are
described below:

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DIS INPUT: This allows you to activate the Test/Reset or
Emergency Purge functions with a remote contact closure or
remotely disable the monitor or change to a lower alarm setpoint
during night setback. The night setback function may be wired to
use open or closed contacts. When wired for “open” contacts,
opening the contacts will disable the monitor; when wired for
“closed” contacts, closing the contacts will disable the monitor.
The connection should be made through a switch to the INPUT
COM terminal. See Configuration Parameter P07.

ALRM INPUT (Alarm Input): This allows you to remotely activate
the Test/Reset or Emergency Purge functions via a contact
closure or wire an external alarm/event into the monitor. The
external alarm function may be wired to use open or closed
contacts. When wired for “open” contacts, opening the contacts
will activate the monitor’s alarm; when wired for “closed”
contacts, closing the contacts will activate the monitor’s alarm.
The connection should be made through a switch to the INPUT
COM terminal. See Configuration Parameter P08.

INPUT COM (Input Common): This is the ground used for the
DIS INPUT and ALRM INPUT connections.

RELAY 1 (Relay 1): This relay has contacts that are open in the
non-energized state. It can be configured to close for alarm,
caution, or emergency purge or open for alarm, caution,
emergency purge, or loss of power. See Configuration
Parameter P09.

RELAY 2 (Relay 2): This relay has contacts that are closed in
the non-energized state. It can be configured to open for alarm,
caution, or emergency purge or close for alarm, caution,
emergency purge, or loss of power. See Configuration
Parameter P10.

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Figure 3 – Field Wiring Diagram

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SECTION 3

Calibration

Overview

The fume hood monitor must be calibrated before first use and
checked annually thereafter. The calibration is stored in the non­volatile memory of the instrument and is not lost when the
monitor loses power.

Fume hoods vary in design and performance. Because each
hood installation and its air flow patterns is unique, this monitor
must be calibrated in the field on the fume hood in which it is
installed.

DANGER: Calibration and configuration of this monitor must be
performed by qualified personnel. Proper guidelines for
monitoring any ventilation apparatus are established on the
basis of toxicity or hazards of the materials used, or the
operation conducted within the ventilation apparatus. Personnel
calibrating this monitor must be completely aware of the
regulations and guidelines specific to its application.

If you need a reference on performing traverses on fume hoods,

please consult ANSI/ASHRAE 110-1995 Method of Testing
Performance of Laboratory Fume Hoods, section 6.2 Face

Velocity Measurements.

Tools Required

1. Calibrated thermo-anemometer. Suggested instruments
include the Alnor Model 9870D or Model CF8570.

2. Small pointed tool to press the recessed Up and Down
buttons. A straightened paper clip works well.

Procedure

1. Ensure that the monitor is properly installed. The flexible air
hose should be attached securely to both the fume hood
side wall and the back of the monitor.

2. The power supply plug should be firmly in the power jack on
the back of the monitor and the power supply should be
plugged into an appropriate live electrical outlet. The monitor

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must be warmed up for at least 10 minutes to reach a stable
operating temperature.

NOTE: For the two point calibration, high and low face velocities
need to be determined. These two values must be between 50
and 250 fpm (0.25 and 1.27 m/s). An accurate calibration
requires that the low and high calibration points be separated by
an adequate velocity. Therefore, a minimum separation value is
set at the factory. After calibration is completed at the low point,
the display will jump ahead to the suggested value for the high
calibration point. Typical values for calibration are 70 fpm (0.36
m/s) for the low and 150 fpm (0.76 m/s) for the high.

Constant Volume Laboratory Fume Hood Calibration

1. While the monitor warms up, use a calibrated thermo­anemometer to determine the velocity through the face of
the hood by taking two detailed traverses. Take one traverse
at low flow with the sash true full open (beyond the sash
stop) and another at high flow with the sash at 12 inches
(204 mm). For each traverse, divide the area under the sash
into equal areas and measure at the center of those areas.
Do not move more than 6 inches (152 mm) between
readings. A minimum of sixteen readings must be taken per
traverse. Record the average velocities and the sash heights
where they are taken.

2. Move the sash back to the true full open position (i.e., the
point where the low flow face velocity traverse was
conducted).

3. Press and hold the Test/Reset button until you hear a double
beep and see CAL displayed.

NOTE: This Calibration initialization sequence takes
approximately 10 seconds, during which the display will be fully
lit (all segments on) for about 3 seconds and then blank (all
segments off) for about 5 seconds before the word CAL appears.

4. Press the Test/Reset button to begin the calibration process.
Lo will be displayed for two seconds and then the low
calibration reference starting point. Use the Up or Down
buttons to adjust the displayed value to match the actual
measured low face velocity (sash full open).

5. Press the Test/Reset button once the desired value is
displayed. The monitor will count down 5 seconds (shown on

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the display) which allows the operator time to step away
from the face of the fume hood so as to not create air
turbulences during calibration. The monitor will then take
readings for 20 seconds (shown as a countdown display)
which is used for the Lo calibration. Once the countdown is
complete, Hi will then be displayed for two seconds.

NOTE: If an error message is displayed at this point, there is
problem with the calibration and the procedure will be
terminated. See Calibration Error Codes below.

6. Move the sash to the 12 inch (305 mm) open position (the
point where the high flow face velocity traverse was
conducted).

7. Use the Up/Down buttons to adjust the displayed Hi value to
match the actual measured high face velocity (sash at 12
inch/204 mm open position).

8. Press the Test/Reset button once the desired value is
displayed. The monitor will count down 5 seconds (shown on
the display) which allows the operator time to step away
from the face of the fume hood so as to not create air
turbulences during calibration. The monitor will then take
readings for 20 seconds (shown as a countdown display)
which is used for the Hi calibration.

9. The monitor now conducts a self-test to determine if the
calibration was successful. If this test indicates that the
calibration was successful, the instrument will emit two quick
beeps, store the new values in memory, and return the
display to the CAL configuration menu selection.

This completes the calibration procedure. To view other
parameter configuration menu selections (see Section 5), press
the Up/Down buttons. To exit and return to the Run mode, press
and hold the Test/Reset button for two seconds.

Variable Air Volume (VAV) Laboratory Fume Hoods

Changing the sash position on a VAV system will not change the
average face velocity thru the hood. In order to calibrate the 335
installed on a VAV fume hood, it will be necessary to change the
average face velocity thru the hood to generate a low and high
velocity calibration set point. This can be accomplished three
different ways:

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1. Adjust the VAV controller to produce a low and high face
velocity with the sash positioned at 18 inches.

2. With the sash full open, lock the VAV controller so as to
maintain a constant volume thru the hood regardless of sash
position. The average face velocity thru the hood at the full
open position will be used for the low velocity calibration set
point. Closing the sash to 18 inches should generate an
average face velocity high enough to be used for the high
velocity calibration set point.

3. If the VAV controller cannot be accessed to manipulate the
average face velocity thru the hood or to lock the controller
to a fixed flow rate, then blocking off part of the hood
opening will be required to create the low and high face
velocity set points necessary for calibration.

a. Move the sash to the full open position and perform a

face velocity traverse to determine the low calibration set
point.

b. With the sash positioned at the full open position, block

off half of the hood opening with cardboard or something
similar to generate a high face velocity and perform a
face velocity traverse to determine the high calibration
set point.

NOTE: Typical values for calibration are 70 fpm (0.36 m/s) for
the low and 150 fpm (0.76 m/s) for the high.

VAV fume hood with sash full open VAV fume hood with sash full

open with half blocked off

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Variable Air Volume (VAV) Laboratory Fume Hood Calibration

Once the methodology for establishing a low and high face
velocity on a VAV fume hood has been determined, proceed with
the following steps to calibrate the 335 fume hood monitor.

1. Press and hold the Test/Reset button until you hear a double
beep and see CAL displayed.

NOTE: This Calibration initialization sequence takes
approximately 10 seconds, during which the display will be fully
lit (all segments on) for about 3 seconds and then blank (all
segments off) for about 5 seconds before the word CAL appears.

2. Press the Test/Reset button to begin the calibration process.
Lo will be displayed for two seconds and then the low
calibration reference starting point. Use the Up or Down
buttons to adjust the displayed value to match the actual
measured low face velocity traverse.

3. Press the Test/Reset button once the desired value is
displayed. The monitor will count down 5 seconds (shown on
the display) which allows the operator time to step away
from the face of the fume hood so as to not create air
turbulences during calibration. The monitor will then take
readings for 20 seconds (shown as a countdown display)
which is used for the Lo calibration. Once the countdown is
complete, Hi will then be displayed for two seconds.

NOTE: If an error message is displayed at this point, there is
problem with the calibration and the procedure will be
terminated. See Calibration Error Codes below.

4. Adjust the VAV system to the point where the high flow face
velocity traverse was conducted.

5. Use the Up/Down buttons to adjust the displayed Hi value to
match the actual measured high face velocity.

6. Press the Test/Reset button once the desired value is
displayed. The monitor will count down 5 seconds (shown on
the display) which allows the operator time to step away
from the face of the fume hood so as to not create air
turbulences during calibration. The monitor will then take
readings for 20 seconds (shown as a countdown display)
which is used for the Hi calibration.

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Error Code

Cause

ErL

Airflow below the instrument’s measurement range.

ErH

Airflow above the instrument’s measurement range.

Err

Too much variation in airflow.

Er2

Insufficient difference between the low and high
calibration points.

7. The monitor now conducts a self-test to determine if the
calibration was successful. If this test indicates that the
calibration was successful, the instrument will emit two quick
beeps, store the new values in memory, and return the
display to the CAL configuration menu selection.

This completes the calibration procedure for a VAV laboratory
fume hood. To view other parameter configuration menu
selections (see Section 5), press the Up/Down buttons. To exit
and return to the Run mode, press and hold the Test/Reset
button for two seconds.

Calibration Error Codes

If an error occurs during a calibration step, the instrument will
emit one long beep and the display will show an error code.

If a calibration error is detected, the user must press the
Test/Reset button to acknowledge the error condition. After
acknowledgement, the monitor will return to the CAL
configuration menu selection so that another calibration can be
attempted. The incorrect values will not be stored in memory.
The monitor will continue to use the previous calibration values
until a correct calibration is successfully completed.

Suggestions For Obtaining An Acceptable Calibration

ErL — To obtain a slightly higher airflow velocity for the low cal

point, lower the sash a few inches and take another set of
velocity readings. Use this new sash position as the low cal
position.

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ErH — To obtain a slightly lower airflow velocity for the high cal

point, raise the sash a few inches and take another set of
velocity readings. Use this new sash position as the high cal
position.

If the unit displays this error during Calibration, the thermistor is
broken. Return to TSI for service.

Err — To get a more laminar (stable) set of sample readings,
check the following during the 20 second calibration period:

 Make sure no one is walking in front of the hood.
 Make sure doors and windows are not being opened and

closed.

 Do not change baffle positions on the hood.
 Check to see if the lab HVAC is cycling on or off, either

heating or air conditioning.

 Compare all readings taken during the traverse to see if any

vary by more than 10 fpm above or below the calculated
average (“fast spots” or “slow spots”). Hint: Set the
thermoanemometer to the lowest possible time constant.

 Make sure the hose is connected properly to the sidewall of

the hood and the monitor and is not kinked.

 Check for presence of a diffuser or supply grille right above,

or close to, the hood. If air is being “pushed” toward the front
of the monitor, try diverting or blocking it.

Er2 — Adjust sash positions to achieve either a lower low cal
point (by raising the sash) and/or a higher high cal point (by
lowering the sash).

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Low Alarm Setup

The low alarm setpoint should be established before first use
and checked annually thereafter. The alarm setup is stored to
nonvolatile memory and is not lost when the monitor loses
power.

Procedure

1. Verify that the monitor was properly installed.

2. The power supply plug should be firmly in the power jack on
the back of the monitor and the power supply should be
plugged into an appropriate live electrical outlet. The monitor
must be warmed up for at least 10 minutes to reach a stable
operating temperature.

3. Once the monitor warms up, note the velocity displayed
through the fume hood. This can be observed without
changing the settings by pressing the Down Button and
watching the number that alternates with the low alarm
setting (the default setting is OFF).

4. Press and hold the Down Button for 5 seconds to access the
low alarm setup menu. The current alarm setting will be
displayed.

5. Use either the Up or Down Button to change the displayed
value to match the actual desired low alarm point. Press the
Test/Reset button when the desired value is displayed.

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SECTION 4

Normal Operation

Power Up Sequence

On power up, the digital display is initialized and every segment
of the display turned on for two seconds. All three of the LEDs
and the horn are also activated.

After the two seconds has expired, the three LEDs and the horn
will turn off. The version number of the firmware will then be
displayed for two seconds.

Run Mode

An electronic bar graph travels horizontally through universally
recognized red (danger), yellow (caution) and green (safe)
colored zones as the flow velocity changes. Corresponding large
colored LEDs also illuminate.

The green LED indicates a normal airflow condition. The yellow
LED) indicates that the airflow is within the caution zone
between normal and low alarm. The red LED indicates an airflow
alarm.

These Good, Caution, and Alarm zones are determined by a
user programmed low alarm set point and set point offset. If the
digits are enabled, the digital display shows the air flow velocity
measurement either feet per minute (fpm) or meters per second
(m/s). Over range measurements are shown as Hi. Under range
measurements are shown as Lo.

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Monitor Test

During normal operation, pressing and holding the Test/Reset
Button for 2 to 5 seconds will turn on all segments on the LCD
and all LEDs as well as the horn and the alarm relay output. To
test the emergency purge feature, press the Emergency Purge
button; press it a second time to turn it off.

Horn

The horn will be activated whenever the Low or High Alarm zone
has been reached (unless the horn has been permanently
disabled).

Once the horn has been activated due to an alarm condition, it
will stay on until the condition causing the alarm ceases to exist
or the horn is temporarily or permanently disabled. If the horn is
temporarily disabled, the horn will turn off and not come back on
until either the temporary horn disable timer expires
(Configuration Parameter P03) or another alarm condition is
detected. If the horn is permanently disabled, the horn will not
come back on until the horn is re-enabled.

The horn will sound when the sash override input is active and
will remain on until the sash override input is deactivated or the
Test/Reset button is pressed.

The horn will also sound when the Emergency Purge button is
pressed and will remain on until the Emergency Purge button is
pressed again or the Test/Reset button is pressed.

The horn will pulse intermittently when the external alarm input is
active and will remain on until the external alarm input is
deactivated.

If the night setback is active (with P12 set to “OFF”), the horn will
be completely disabled in all instances until this input is
deactivated. (See P07 for details)

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Temporary Horn Disable

Pressing the Test/Reset button temporarily silences the horn.
The horn slash through icon will be on the display indicating that
the horn is temporarily disabled. If the horn is temporarily
disabled, it will turn off and not come back on until either the
temporary horn disable timer expires or until the monitor detects
another alarm condition. See Configuration Parameter P03 for
programming the timer.

Permanent Horn Disable

The horn may be permanently disabled during normal operation
by pressing and holding the Test/Reset button for five seconds.
After five seconds, the horn slash through icon will continuously
flash on the display indicating that the horn is permanently
disabled; the horn will no longer sound in an alarm zone or when
any alarm input is activated. Removal of power to the monitor
does not change this setting; upon restoration of power, the horn
will still be disabled. The horn may be re-enabled by pressing the
Test/Reset button for five seconds. The flashing horn slash
through icon will then be shut off.

Viewing Alarm Set Points

The alarm set points may be viewed during normal operation by
pressing the Up and Down Buttons. The Up Button is to the right
of the green LED. The down button is to the left of the red LED.
A straightened out paper clip works well to access them. If the
Up Button is pressed, the display will toggle between the current
reading and the High Alarm set point. If the Down Button is
pressed, the display will toggle between the current reading and
the Low Alarm set point.

The display will toggle between the current reading and the
selected set point until there is no keypad activity for five
seconds. At that point, the monitor will return to normal operation
and display the current airflow reading.

Changing Alarm Set Points

The alarm set points can be changed during normal operation
and while viewing a set point by holding the Up Button (High
Alarm) or Down Button (Low Alarm) for five seconds. When the
button is first pushed, the display will toggle between the current

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Alarm

LED Status

Low alarm

Red LED flashes

High alarm

Green LED flashes

Night setback low alarm

Yellow LED flashes

reading and the selected set point. If the button is held for five
seconds, the monitor goes into a program mode that allows
changing the selected set point. The corresponding LED will
continuously flash and the display will turn on the PGM
descriptor to indicate that the monitor is in program mode.

The displayed setting is changed by pressing the Up and Down
Buttons. The Up Button will increment the set point by 1 fpm or
by 0.01 m/s, depending on the units configuration. The Down
Button will decrement the set point by 1 fpm or by 0.01 m/s.
When the desired setting is displayed, press the Test/Reset
Button. The PGM descriptor will flash once and the horn will give
two quick beeps to acknowledge the save and the monitor will
return to normal operation and display the current airflow
reading.

IMPORTANT: If the Test/Reset button is pressed and held for 2
seconds, the change will not be saved; this is signalled via one
long horn beep

LED Status When Changing the Alarm Setpoint

High Alarm Disable

The high alarm is enabled/disabled through the Changing Alarm
Set Points procedure described above. To disable the high
alarm, the high alarm set point should be set to OFF. While
scrolling through the high alarm set point values, the OFF
selection is located right after the upper most range of the
allowable values. If the high alarm is enabled, the relay can be
disabled/enabled for the high alarm by using Configuration
Parameter P11.

Emergency Purge

This button can be configured to activate a relay that can be
used to command the fume hood damper to full open until
pressed again. See Configuration Parameter P09 and P10 to set
up the relay.

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SECTION 5

Parameter Configuration

General

NOTE: Configurable parameters are stored to nonvolatile

memory of the instrument and will not be lost when the monitor
loses power.

To access the Configuration mode, press and hold the
Test/Reset button until you hear a double beep and see CAL
displayed.

NOTE: This Calibration initialization sequence takes
approximately 10 seconds, during which the display will be fully
lit (all segments on) for about 3 seconds and then blank (all
segments off) for about 5 seconds before the word CAL appears.

Once this mode is entered, the monitor will stop monitoring the
airflow and display the configuration menu selections. The
configuration menu selections are CAL, P01, P02, P03, P04,
P05, P06, P07, P08, P09, P10, P11, P12 and dEF.

The first menu selection displayed is CAL. To view the other
parameter configuration menu selections, successively press the
Up and Down Buttons (Up to go forward; Down to go backward).
When the desired configuration menu selection is displayed,
press the Test/Reset button to enter. Within a selection, pressing
the Up Button will scroll forward and pressing the Down Button
will scroll backward. To quickly scroll, hold the button. The
scrolling will wrap around when the allowable range is exceeded.

When a configuration menu selection is entered and a setting is
changed, the Test/Reset button must be pressed to save the
change. The PGM descriptor will flash once and the horn will
give two quick beeps to acknowledge the save and the monitor
will return to the Parameter Configuration menu.

IMPORTANT: If the Test/Reset button is pressed and held for 2

seconds, the change will not be saved; this is signalled via one
long horn beep.

All parameters are configured in the same manner. To exit the
Parameter Configuration menu, press and hold the Test/Reset
button for 2 seconds. The monitor will also time out and exit the

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Configuration Parameter

Factory Default

CAL — Calibration

(A field calibration is required.
See the Section 3: Calibration)

P01 — Digits enabled/disabled

Disabled

P02 — Units of measure

English (feet/minute)

P03 — Temporary horn disable

timer

255 (infinite)

P04 — Caution-to-alarm

transition delay timer

3 seconds

P05 — Alarm-to-caution

transition delay timer

3 seconds
P06 — Low alarm caution offset

20 fpm

P07 — Night setback input

CL.1 (night setback mode active
with contact closure)

P08 — Alarm input

CL.2 (sash over-ride, activates
with contact closure)

P09 — Relay output 1

CL.1 (alarm output, contacts
close with alarm)

P10 — Relay output 2

OP.2 (alarm output, contacts
open in alarm)

P11 — High alarm relay

OFF

P12 — Night setback low alarm

OFF

dEF — Default reset

Resets P01 – P12 parameters to
factory defaults

Parameter Configuration menu after 1 minute has elapsed
without any keypad activity.

SUMMARY: Pressing the Test/Reset button for 10 seconds
accesses the Configuration menu. Pressing the Up or Down
Button advances to the next parameter and also navigates within a
selection. Pressing once manually scrolls; holding scrolls quickly.
Pressing and releasing the Test/Reset button after a change has
been made saves it; pressing and holding the Test/Reset Button
for two seconds cancels the change and exits.

Configuration Parameters

The following table shows the factory default settings for the
monitor’s various programmable parameters. A default reset
restores these settings.

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CAL — Calibration

See Section 3 Calibration.

P01 — Digits Enabled/Disabled

The digits can be enabled or disabled using this Configuration
Parameter. It only disables the numeric airflow velocity reading.
The status indicators and icons will not be turned off. After this
Configuration menu selection is entered, the monitor will turn on
the program mode PGM descriptor and, if the digits are disabled,
will show:

If the digits are enabled, one of the following will be displayed
depending on the current unit of measure selected:

Pressing either the Up or Down Button toggles between the two
settings. When the desired setting is displayed, press the
Test/Reset button. The PGM descriptor will flash once and the
horn will give two quick beeps to acknowledge the save. The
digits and applicable unit descriptor (fpm or m/s) will either be on
or off during normal run mode.

The monitor will return to the P01 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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P02 — Unit of Measure

The velocity can be displayed either in feet per minute (fpm) or in
meters per second (m/s), with the applicable descriptor (fpm or
m/s) on during normal run mode.

After this Configuration menu selection is entered, the monitor
will turn on the program mode PGM descriptor and display the
current unit descriptor:

Press the Up or Down Button to toggle between the two settings.
When the desired setting is displayed, press the Test/Reset
button. The PGM descriptor will flash once and the horn will give
two quick beeps to acknowledge the save. The applicable unit
descriptor (fpm or m/s) will then be on during normal run mode.

The monitor will return to the P02 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

P03 — Temporary Horn Disable Timer

During an alarm condition, the alarm can be acknowledged by
pressing the Test/Reset button. This temporarily silences the
horn. Normally, the horn will be silenced for the duration of the
current alarm condition. The monitor can be configured to have
the horn come back on after a specified number of minutes or
configured so that the horn can not be silenced at all.

This Configuration Parameter sets the temporary disable timer.
After this Configuration menu selection is entered, the monitor
will turn on the program mode PGM descriptor and display the
current value for the temporary horn disable timer. This timer can
be set to a value from 0 to 255. A setting of 255 indicates that
when the alarm is temporarily silenced by pressing the
Test/Reset button, the horn will not come on again until this
alarm condition clears and another alarm event occurs. A setting
of 0 is used to prevent silencing of the horn by pressing the
Test/Reset button. Any value between indicates the time, in

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minutes, after which when the horn will come back on if the
alarm condition has not been corrected.

For example, if the monitor is configured for a temporary horn
disable time of 10 minutes, the display will show:

Press the Up Button to increase the timer value by 1 minute or
the Down Button to decrease the timer value by 1 minute. When
the desired setting is displayed, press the Test/Reset button.
The PGM descriptor will flash once and the horn will give two
quick beeps to acknowledge the save.

The monitor will return to the P03 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

P04 — Caution-to-Alarm Transition Delay Timer

The yellow caution to red alarm transition time is the delay
period, in seconds, that a given air flow condition must remain
present before the monitor will go into the appropriate alarm
zone. This feature prevents the monitor from toggling back and
forth between zones when a condition is on the border.

This Configuration Parameter sets the caution-to-alarm transition
timer. After this configuration menu selection is entered, the
monitor will turn on the program mode PGM descriptor and
display the current value for the caution-to-alarm transition timer.
This timer can be set from 0 to 255 seconds.

For example, if the monitor is currently configured for a caution­to-alarm transition time of three seconds, the display will show:

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Press the Up Button to increase the timer value by 1 second or
the Down Button to decrease the timer value by 1 second. When
the desired setting is displayed, press the Test/Reset button.
The PGM descriptor will flash once and the horn will give two
quick beeps to acknowledge the save.

The monitor will return to the P04 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

P05 — Alarm-to-Caution Transition Delay Timer

The red alarm to yellow caution transition time is the delay
period in seconds that an air flow condition must remain present
before the monitor will go into the appropriate warning zone. This
feature prevents the monitor from toggling back and forth
between zones when a condition is on the border.

This Configuration Parameter sets the alarm-to-caution transition
timer. After this Configuration menu selection is entered, the
monitor will turn on the program mode PGM descriptor and
display the current value for the alarm-to-caution transition timer.
This timer can be set from 0 to 255 seconds.

For example, if the monitor is currently configured for an alarm­to-caution transition time of three seconds, the display will show:

Press the Up Button to increase the timer value by 1 second or
the Down Button to decrease the timer value by 1 second. When
the desired setting is displayed, press the Test/Reset button.
The PGM descriptor will flash once and the horn will give two
quick beeps to acknowledge the save.

The monitor will return to the P05 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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P06 — Low Alarm Caution Offset

The low caution offset defines the starting point of the low
caution zone. It is a value (in the current unit of measure) that is
added to the low alarm set point. It determines when the yellow
low caution light comes on.

EXAMPLE: If the low alarm is set at 70 fpm and the low alarm
caution offset is set at 20 fpm, the yellow low caution light will
come on at a value of 70 to 89 fpm.

This Configuration Parameter sets the low alarm caution offset.
After this configuration menu selection is entered, the monitor
will turn on the program mode PGM descriptor and display the
current value for the low alarm caution offset.

For example, if the monitor is currently configured for a low
alarm caution offset of 20 fpm, the display will show:

Press the Up Button to increase the value by 1 measurement
unit or the Down Button to decrease the value by 1
measurement unit. When the desired setting is displayed, press
the Test/Reset button. The PGM descriptor will flash once and
the horn will give two quick beeps to acknowledge the save.

The monitor will return to the P06 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

P07 — Dis Input

This Configuration Parameter configures the switch settings for
the instrument’s Remote Test/Reset, Remote Emergency Purge,
and Night Setback features. After this Configuration menu
selection is entered, the monitor will turn on the Program mode
PGM descriptor and display the current setting. Press the Up
and Down arrow keys to scroll through the available settings.

NOTE: P07 may only be configured to have one of these
features operational at a time. The Remote Test/Reset and

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Remote Emergency Purge functions are also available under
P08.

Remote Test/Reset — This allows the operator to activate the
instrument’s Test/Reset function remotely via a contact closure.
It functions in the same manner as the Test/Reset button on the
instrument’s front panel (see Section 1). The local Test/Reset
button is still active even if the instrument is configured for
Remote Test/Reset. If this function is active, the following display
will appear under P07:

Remote Emergency Purge — This allows the operator to
activate the instrument’s Emergency Purge function remotely via
a contact closure. It functions in the same manner as the
Emergency Purge button on the instrument’s front panel (see

Section 1). The local Emergency Purge button is still active even

if the instrument is configured for Remote Emergency Purge. If
this function is active, the following display will appear under
P07:

Night Setback — Night setback can be configured for either a
contact closure or opening. If the monitor is configured to go into
the night setback mode when the contacts are closed, the
display will show:

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If the monitor is configured to go into night setback when the
contacts are opened, the display will show:

When activated, the nigh setback performs one of two possible
actions, based on the setting of P12.

P12 = OFF — The monitor is disabled when in the Night Setback
mode. The horn is off, the relays are in their “normal” state, and
all the LEDs are off. The LCD flashes “diS” once per second.

P12 = a Number — This number is the low alarm setpoint value
when the monitor is in the Night Setback mode; this value
overrides the normal low alarm setting. The caution range during
Night Setback is automatically extended from the normal
warning alarm point to the P12 setting. Normal flow is any flow
reading that is above the normal warning alarm limit. Night
Setback also alters the low alarm setting feature. Pressing the
Down button while in Night Setback Low Alarm mode displays
the night setback low alarm setting; holding the Down button
down for five seconds allows you to change the night setback
low alarm setting, but does not allow you to turn it off. See P12
for information on turning the night setback low alarm off.

When the desired setting (Remote Test/Reset, Remote
Emergency Purge, or Night Setback) is displayed, press the
Test/Reset button. The PGM descriptor will flash once and the
horn will emit two quick beeps to acknowledge that the setting
has been saved.

The monitor will return to the P07 Configuration menu selection.
Press the Up and Down Buttons to advance to another

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Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

P08 — Alarm Input

This Configuration Parameter configures the switch settings for
the instrument’s Remote Test/Reset, Remote Emergency Purge,
and Sash Override/Alarm Input features. After this Configuration
menu selection is entered, the monitor will turn on the Program
mode PGM descriptor and display the current setting. Press the
Up and Down arrow keys to scroll through the available settings.

NOTE: P08 may only be configured to have one of these
features operational at a time. The Remote Test/Reset and
Remote Emergency Purge functions are also available under
P07.

Remote Test/Reset — This allows the operator to activate the
instrument’s Test/Reset function remotely via a contact closure.
It functions in the same manner as the Test/Reset button on the
instrument’s front panel (see Section 1). The local Test/Reset
button is still active even if the instrument is configured for
Remote Test/Reset. If this function is active, the following display
will appear under P08:

Remote Emergency Purge — This allows the operator to active
the instrument’s Emergency Purge function remotely via a
contact closure. It functions in the same manner as the
Emergency Purge button on the instrument’s front panel (see

Section 1). The local Emergency Purge button is still active even

if the instrument is configured for Remote Emergency Purge. If
this function is active, the following display will appear under
P08:

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Sash Override/External Alarm Input — A selection can be

made between a sash override input and external alarm input.
The differences between the inputs relates to the visual, audible,
and remote indications activated when the input is received by
the monitor.

The sash override input can be connected to a sash position
switch on the fume hood to indicate that the sash has exceeded
a given height and a full alarm is sounded. When activated, the
sash override puts the monitor into alarm in the same manner as
a low air flow condition. The red LED lights, the horn sounds, the
alarm relay is activated, and the Override descriptor on the
display illuminates.

The external alarm input is typically used for some external
remote event that may not warrant an alarm to the user, but is
used rather as an alert of a situation that may necessitate
attention. When activated, the external alarm input causes the
horn on the monitor to sound intermittently and illuminates the
EXT descriptor on the display to indicate that this is an external
alarm. The EXT descriptor will remain on until the external alarm

input returns to an inactive state. Note that this selection will not

cause the alarm relay to activate.

NOTE: The local alarm (steady horn) will always take
precedence over an external alarm event.

This Configuration Parameter selects the input and configures it
for open or closed contacts. Open indicates that opening the
contacts activates this alarm; closed indicates that closing the
contacts activates the alarm.

If the monitor is configured for closed contacts to activate the
external alarm, the display will show:

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If the monitor is configured for open contacts to activate the
external alarm, the display will show:

If the monitor is configured for closed contacts to activate the
sash override alarm, the display will show:

If the monitor is configured for open contacts to activate the sash
override alarm, the display will show:

Press either the Up or Down button to scroll through the settings.
When the desired setting is displayed, press the Test/Reset
button. The PGM descriptor will flash once and the horn will give
two quick beeps to acknowledge the save.

The monitor will return to the P08 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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Relay Function

Setting Displayed

Contact State

Not Used

--.1

Always open

Alarm Output

CL.1 with horn icon
and red LED

Closed when in
alarm

Alarm Output

OP.1 with horn icon
and red LED

Open when in alarm
or when power is
lost

Caution Output

CL.1 with horn icon
and yellow LED

Closed when in
caution or alarm

Caution Output

OP.1 with horn icon
and yellow LED

Open when in
caution, alarm, or
when power is lost

Emergency Purge
Output

CL.1 with EMERG

Closed when in
emergency purge

Emergency Purge
Output

OP.1 with EMERG

Open when in
emergency purge or
power is lost

P09 — Relay Output 1

This relay output has contacts that are open in the non­energized state. The contacts can be configured to close when
the function is activated or to open when the function is activated
or power is lost. It may also be deactivated. The table below
describes the selections:

The relay function is disabled when the display shown above is
selected. The relay function is enabled when one of the following
displays is selected.

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NOTE: The red LED at the top of the instrument will light in

conjunction with two displays shown above when the Alarm
Output selections appear; the yellow LED will light when the
Caution Output selections appear.

Press either the Up or Down button to cycle through the settings.
When the desired setting is displayed, press the Test/Reset
button. The PGM descriptor will flash once and the horn will give
two quick beeps to acknowledge the save.

The monitor will return to the P09 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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Relay Function

Setting Displayed

Contact State

Not Used

--.2

Always closed

Alarm Output

CL.2 with horn icon
and red LED

Closed when in
alarm or power is
lost

Alarm Output

OP.2 with horn icon
and red LED

Open when in alarm

Caution Output

CL.2 with horn icon
and yellow LED

Closed when in
caution, alarm, or
when power is lost

Caution Output

OP.2 with horn icon
and yellow LED

Open when in
caution or alarm

Emergency Purge
Output

CL.2 with EMERG

Closed when in
emergency purge or
when power is lost

Emergency Purge
Output

OP.2 with EMERG

Open when in
emergency purge

P10 — Relay Output 2

This relay output has contacts that are closed in the non­energized state. The contacts can be configured to open when
the function is activated or to close when the function is activated
or power is lost. The table below describes the selections:

The relay function is disabled when the display shown above is
selected. The relay function is enabled when one of the following
displays is selected.

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NOTE: The red LED at the top of the instrument will light in

conjunction with two displays above when the Alarm Output
selections appear; the yellow LED will light when the Caution
Output selections appear.

Press either the Up or Down button to cycle through the settings.
When the desired configuration is displayed, press the
Test/Reset button. The PGM descriptor will flash once and the
horn will give two quick beeps to acknowledge the save.

The monitor will return to the P10 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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P11 — High Alarm Relay Disable

The alarm state can be sent to a remote location by means of a
relay output. The relay can be disabled for the high alarm if it is
not warranted for the application.

This Configuration Parameter disables or enables the high alarm
relay output. After this Configuration menu selection is entered,
the monitor will turn on the program mode PGM descriptor and
display the current value for the high alarm relay activation.

If the monitor is configured for the relay to be enabled for the
high alarm, the display will show:

If the monitor is configured for the relay to be disabled for the
high alarm, the display will show:

Press either the Up or Down button to alternate between the two
settings. When the desired configuration is displayed, press the
Test/Reset button. The PGM descriptor will flash once and the
horn will give two quick beeps to acknowledge the save.

The monitor will return to the P11 Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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P12 — Night Setback Low Alarm

This Configuration Parameter sets the night setback low alarm.
After this configuration menu selection is entered, the monitor
will turn on the program mode PGM descriptor and display the
current value for the night setback low alarm. It may be set to
“OFF” or a numerical value; see P07 for a functional description
of this feature.

If the monitor is configured for a night setback low alarm of 55
fpm, for example, the display will show:

Press the Up/Down buttons to increase/decrease the displayed
value by 1 measurement unit. Once the displayed value reaches
a setting where it is above the normal low alarm or below the
lowest setpoint of the instrument, the display will go to OFF.

When the desired setting is displayed, press the Test/Reset
button. The PGM descriptor will flash once and the horn will emit
two quick beeps to acknowledge the save.

dEF — Reset Configuration Parameters to Factory Default Settings

PO1 – PO11 can be reset to the factory defaults located in the
memory of the fume hood monitor. This does not reset the field
calibration or the low and high alarm settings. After this
configuration menu selection is entered, the monitor will turn on
the program mode PGM descriptor and the display will show:

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Press the Test/Reset button. The PGM descriptor will be
continuously displayed and the horn will give two quick beeps to
acknowledge that the configuration settings have been set to
their factory default settings.

The monitor will return to the dEF Configuration menu selection.
Press the Up and Down Buttons to advance to another
Configuration Parameter. Press and hold the hold the Test/Reset
button for 2 seconds to exit the Configuration menu.

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42

Problem

Possible Cause /
Corrective Action

No display or lights.

The power supply cord is not plugged
into the monitor or live AC outlet.

No audible alarm when
display shows Lo or Hi.

Audible alarm disabled. If horn slash
through icon is flashing, the horn has
been permanently disabled. Press
Test/Reset button for 5 seconds to re­enable.

No audible alarm only when
display shows Hi.

High alarm disabled. See “Changing

Alarm Set Points” section to enable.

SECTION 6

Troubleshooting and Service

Error Codes

NOTE: Error codes associated with Calibration (ErL, ErH, Err,

and Er2 do not affect normal operation. See Section 2:

Installation for more information on Calibration Error Codes.

Error checks are continuously performed on the monitor. In the
event the monitor detects an error, an error message will
continuously flash on the display to alert the user. The number in
the error code relates to the specific error found. This error
message cannot be cleared; the monitor needs to be returned to
the factory for service. Please contact TSI for assistance.

NOTE: To prevent erroneous readings, the monitor will lock up.

Troubleshooting Guide

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43

43

Problem

Possible Cause /
Corrective Action

Pulsed audible alarm.

This indicates an external alarm. The
EXT descriptor on the LCD should
also be on. Attend to the external
alarm event. See Configuration
Parameter P08.

Nothing happens when the
Emergency Purge button is
pressed.

The emergency purge function is not
configured. See Configuration
Parameters P09 and P10.

Alarm does not activate
immediately.

Alarm does not come out of
alarm immediately when
good air flow is restored.

The alarm or clear condition must
exist for a predetermined time period
before it is interpreted as a true
event. See Configuration Parameters

P04 and P05 to set the transition

delays.

Monitor does not display the
expected air flows.

The blower speed has changed. User
a thermo-anemometer to perform a
traverse to check the true face
velocity;

The flexible air hose from the monitor
to the side wall sensing hole may be
kinked or bent, restricting the true air
flow. Reroute the hose and recheck
the connections at each end;

If the calibration of the monitor is
suspect, recalibrate as outlined in

Section 3.

Audible alarm cannot be
temporarily silenced using
the Test/Reset button.

The temporary disable timer is set to

0. See Configuration Parameter 03 to
set the temporary disable timer.

Monitor is flashing “diS.”

The monitor is in night set back mode
and is disabled. See Configuration
Parameter P07.

Monitor keeps bouncing
back and forth between
adjacent zones.

The monitor is being influenced by an
external air source. Remove the
source of drafts. See Configuration
Parameters P04 and P05 to set the
transition delays.

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45

45

Mounting Holes
#6-20 Screws

SECTION 7

Mounting Template

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AIRGARD® 335 MONITOR SPECIFICATIONS

Digital Display 3 digit, 7 segment LCD with status indicators and

Display Units If digits are enabled, velocity is represented in feet

Display Range 50 to 250 fpm (0.25 to 1.27 m/s). Over range

Resolution 1 fpm or 0.01 m/s.
Accuracy ±10% or 10 fpm, whichever is greater.
Alarm Range 50 to 250 fpm (0.25 to 1.27 m/s).
Alarm Delays User configurable from 0 to 255 seconds.
Audible Alarm Indication 85 dB at 4 inches (10 cm).
Horn Silence Temporary and permanent.
Night Set Back Monitor can be remotely disabled.
Visual Alarm Indication Large red LED for low flow and high flow alarm

Visual Caution Indication Large yellow LED for low flow caution zones.

Visual Normal Indication Large green LED for normal flow zone.
High Flow Alarm Disable Audible, visual, and relay disable.
Alarm Relay Output Nominal switching capacity 1A at 30 VDC,

Emergency Purge Button on front of monitor activates a relay that can

External Alarm Input Intermittent audible and LCD status indicate

Sash Override Alarm Input Audible and LCD status indicators indicate the

Calibration Two point field calibration required.
Instrument Dimensions Front Faceplate — 5.25 (L) x 3.0 (W) x 5/8 (D)

Mounting Flush, 3.0 (L) x 2.0 (W) inch (7.6 x 5.1 cm) cutout

Operating Conditions 55° to 86°F (13° to 30°C),

Storage Temperature -40° to 150°F (-40° to 65°C),

Power Requirement 9 to 30 V AC/DC. Wall plug in power supply

The calibration and configurable parameters are stored in the non-volatile memory of

the instrument and are not lost when the monitor loses power.

icons. Electronic bargraph moves through colored
zones as the velocity changes.

per minute (fpm) or meters per second (m/s). User
selectable through menu.

measurements shown as Hi. Under range
measurements show as Lo.

zones.

Caution offset is configurable through menu.

0.5A at 125 VAC; form A relay.

be used to command the fume hood damper to
open fully until pressed again. Nominal switching
capacity 1A at 30 VDC, 0.5A at 125 VAC, form A
relay.

external alarm.

sash position switch has been tripped.

inches (13.3 x 7.6 x 1.6 cm);
Rear Enclosure — 3.0 (L) x 2.0 (W) x 0.5 (D)
inches (7.6 x 5.0 x 1.3 cm).

required on hood surface.

5% to 95% RH, non-condensing.

5% to 95% RH, non-condensing.

supplied for US and Canada.

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