Labconco AirGard 335 User guide

OWNER’S MANUAL

AirGard® 335

Fume Hood Monitor

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 Rela y 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

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
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.

— 5.25 (L) x 3.0 (W) x 5/8 (D)

— 3.0 (L) x 2.0 (W) x 0.5 (D)

TABLE OF CONTENTS

Section 1 Introduction

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

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

Section 2 Installation

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

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

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

Section 3 Calibration

Overview .................................................................... 10

Low Alarm Setup ........................................................ 14

Section 4 Normal Operation

Power Up Sequence.................................................... 15

Run Mode................................................................... 15

Monitor Test............................................................... 16

Horn............................................................................ 16

Viewing Alarm Set Points........................................... 17

Changing Alarm Set Points......................................... 17

High Alarm Disable.................................................... 18

Emergency Purge........................................................ 18

Section 5 Parameter Configuration

General........................................................................19

Configuration Parameters...........................................20

CAL — Calibration .....................................................21

P01 — Digits Enabled/Disabled..................................21

P02 — Unit of Measure...............................................21

P03 — Temporary Horn Disable Timer.......................22

P04 — Caution-to-Alarm Transition Delay Timer......23

P05 — Alarm-to-Caution Transition Delay Timer......24

P06 — Low Alarm Caution Offset..............................25

P07 — Dis Input..........................................................26

P08 — Alarm Input .....................................................28

P09 — Relay Output 1.................................................31

P10 — Relay Output 2.................................................33

P11 — High Alarm Relay Disable...............................35

P12 — Night Setback Low Alarm...............................36

dEF — Reset Configuration Parameters to Factory

Default Settings........................................................37

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Section 6 Troubleshooting and Service

Error Codes................................................................. 38

Troubleshooting Guide...............................................39

Service Requests......................................................... 40

Section 7 Mounting Template............................................................ 41

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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 openi ng 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
measuring the air vel ocity 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.

®

335 continuously monitors fume hood face velocity by

Visual Indicators

— An electronic bargraph 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 your Alnor
reseller.

3

Component Identification

(

4

Status LEDs

red, yellow and green)

Down Button

Analog Bargraph

Air Inlet

Mounting

Screw

Mounting Screw

Up Button

Colored Bands

Digital Display

Emergency
Purge Button

Test/Reset
Button

Figure 1 — Front View of Instrument

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5

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 Bargraph Electronic bargraph expands/contracts

through colored zones as t he 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 calibratio n 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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Communications

Port

Flow Tube

Communications Port For factory use only.
Flow Tube Connects the flexible air hose attached to the

Terminal Block Accepts 14-24 AWG wires. See the

Power Jack A suitable AC/DC power supply is supplied

Terminal Block

Power Jack

Figure 2—Rear View of Instrument

fume hood side wall.

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

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 x 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 x

50.8 mm) hole necessary to clear the rear 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.

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

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5. Drill one 9/16 inch (14 mm) diameter hole in the size 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 rear 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 monito r through a power jack
located on the rear 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 front

cover for power requirements.
Terminal Block — The monitor has a seven-pin screw terminal block

connector protruding from the rear 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:

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 ni ght setback. T he
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.

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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. T he 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 non­energized 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 non­energized 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.

Installation Wiring Diagram

This diagram is provided to illustrate the field connections.

DIS INPUT

12

Recommended
External
Switch
Ratings:

5V DC
@0.5mA Max.

ALRM INPUT

J1

TERMINAL
BLOCK

1 2

RELAY 1 CONNECTIONS (NO)

INPUT COMMON

Internal
Relays 1 & 2 are rated for:

RELAY 2 CONNECTIONS (NC)

Use 14 - 24 AWG wire

1A @30V DC

0.5A @25V AC

12

34567

J3

POWER
JACK

2.1mm barrel jack
Use a 9 to 30 V AC/DC
200mA Max. Class 2 power supply

Figure 3 – Field Wiring Diagram

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SECTION 3

Calibration

Overview

IMPORTANT: Calibration procedures are for a constant volume
hood. If you have a VAV hood, call Alnor for the calibration
procedure.

The fume hood monitor must be calibrated before first use and checked
annually thereafter. The calib ration is stored in the non-volatile 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 includ e the

Alnor 9870 or Alnor 8570.

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

rear of the monitor and the power supply should be plugged into an

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appropriate live electrical outlet. The monitor 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.

3. While the monitor warms up, use a calibrated thermo-anemometer

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.

4. Move the sash back to the true full open position (i.e., the point

where the low flow face velocity traverse was conducted).

5. 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.

6. 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).

7. Press the Test/Reset button once the desired value is displayed and

step away from the face of the fume hood. The monitor will count
down 5 seconds (shown on the display) and then take readings for
20 seconds ( again shown as a countdown display). This completes
the Lo calibration; Hi will then be displayed for two seconds.

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12

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 Co des below.

8. Move the sash to the 12 inch (305 mm) open position (the point

where the high flow face velocity traverse was conducted).

9. 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).

10. Press the Test/Reset button once the desired value is displayed and

step away from the face of the fume hood. The monitor will count
down 5 seconds (shown on the display) and then take readings for
20 seconds ( again shown as a countdown display).

11. 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.

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.

Error Code Cause

ErL Airflow below the instrument’s measurement range.
ErH Airflow above the instrument ’ s measurement range.
Err Too much variation i n ai rflow.
Er2 Insufficient difference between the low and high calibration

points.

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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.

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 Alnor 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 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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14

Low Alarm Setup

The low alarm setpoint should be established before first use and
checked annually thereafter. T he 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

rear 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 Butt on and watching the number t hat
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 bargraph 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 holdi ng t he 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 indic ating 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 / R eset 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 hol ding the Up Butt on (High Alarm) or Down
Button (Low Alarm) for five seconds. When the button is first pushed,
the display will toggle between the current 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

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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 descrip tor 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

Alarm LED Status

Low alarm Red LED flashes
High alarm Green LED flashes
Night setback low alarm Yellow LED flashes

High Alarm Disable

The high alarm is ena bled/disabled through the Cha nging Alarm Set
Points procedure described above. To disable the high alarm, the high
alarm set point should be set to OFF. While scrolling t hrough 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 di sabled/enabled for the hi gh 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 c onfiguration menu sele ctions. 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:

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 Parameter

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

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Configuration menu after 1 minute has elapse d 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.

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

P04 — Caution-to-alarm

transition delay timer

P05 — Alarm-to-caution

transition delay timer
P06 — Low alarm caution offset 20 fpm
P07 — Night setback input CL.1 (night setback mode active

P08 — Alarm input CL.2 (sash over-ride, activates

P09 — Relay output 1 CL.1 (alarm output, contacts

P10 — Relay output 2 OP.2 (alarm output, contacts

P11 — High alarm relay OFF
P12 — Night setback low alarm OFF
dEF — Default reset Resets P01 – P12 parameters to

255 (infinite)

3 seconds

3 seconds

with contact closure)

with contact closure)

close with alarm)

open in alarm)

factory defaults

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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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

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.

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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 Do wn Butt ons to advance to another Co nfiguration
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 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:

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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 Do wn Butt ons to advance to another Co nfiguration
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 caution-to­alarm 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

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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 Do wn Butt ons to advance to another Co nfiguration
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 alarm-to­caution 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 Do wn Butt ons to advance to another Co nfiguration
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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

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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 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 remotel y via a contact closure.
It functions in the sa me manner as the Emergency Pur ge 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:

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

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 r ange 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 set back

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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 t he setting has been saved.

The monitor will return to the P07 Configuration menu selection. Press
the Up and Do wn Butt ons to advance to another Co nfiguration
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 remotel y via a contact closure.
It functions in the sa me manner as the Emergency Pur ge 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

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Emergency Purge. If this function is active, the following display will
appear under P08:

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 preceden ce
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. W hen
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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

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P09 — Relay Output 1

This relay output has contacts that are open in the non-energized 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:

Relay Function Setting Displayed Contact State

Not Used --.1 Always open
Alarm Output CL.1 with horn icon

and red LED

Alarm Output OP.1 with horn icon

and red LED

Caution Output CL.1 with horn icon

and yellow LED

Caution Output OP.1 with horn icon

and yellow LED

Emergency Purge
Output

Emergency Purge
Output

CL.1 with EMERG Closed when in

OP.1 with EMERG Open when in

Closed when in
alarm

Open when in alarm
or when power is
lost

Closed when in
caution or alarm

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

emergency purge

emergency purge or
power is lost

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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.

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.

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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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

P10 — Relay Output 2

This relay output has contacts that are closed in the non-energized 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:

Relay Function Setting Displayed Contact State

Not Used --.2 Always closed
Alarm Output CL.2 with horn icon

and red LED

Alarm Output OP.2 with horn icon

and red LED

Caution Output CL.2 with horn icon

and yellow LED

Caution Output OP.2 with horn icon

and yellow LED

Emergency Purge
Output

Emergency Purge
Output

CL.2 with EMERG Closed when in

OP.2 with EMERG Open when in

Closed when in
alarm or power is
lost

Open when in alarm

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

Open when in
caution or alarm

emergency purge or
when power is lost

emergency purge

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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.

NOTE: The red LED at the top of the instrument will light in
conjunction with two displays above when the Alarm Output
appear; the yellow LED will light when the Caution Output
appear.

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selections

selections

35

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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

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 Do wn Butt ons to advance to another Co nfiguration

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

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.

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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:

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 Do wn Butt ons to advance to another Co nfiguration
Parameter. Press and hold the hold the Test/Reset button for 2 seconds
to exit the Configuration menu.

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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
Alnor for assistance.

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

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Troubleshooting Guide

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.

No audible alarm only when
display shows Hi.

Pulsed audible alarm. This indicates an external alarm. The

Nothing happens when the
Emergency Purge button is
pressed.

Alarm does not activate
immediately.

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

Monitor does not display the
expected air flows.

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

High alarm disabled. See “Changing
Alarm Set Points” section to enable.

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

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

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.

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.

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Problem Possible Cause /

Corrective Action

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

Monitor is flashing “diS.” The monitor is in night set back mode

Monitor keeps bouncing
back and forth between
adjacent zones.

The temporary disable timer is set to

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

and is disabled. See Configuration
Parameter P07.

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.

Service Requests

If you need assistance, please contact your Alnor reseller.

Ship to:

ALNOR INSTRUMENT COMPANY
7555 North Linder Avenue
Skokie, Illinois 60077 USA
Toll-Free [phone]
Telephone [phone]
Fax [phone]
Email: [e-mail]
www.alnor.com

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SECTION 7

Mounting Template

Mounting Holes
#6-20 Screws

41

LIMITATION OF WARRANTY AND LIABILITY

Seller warrants that this product, under normal use and service as described in the
operator's manual, shall be free from defects in workmanship a nd material for a peri od of
twenty four (24) months , or the length of tim e specified in operator's m anu al, fr om the d ate of
shipment to the customer. This limited warranty is subject to the following exclusions:

a. Batte ries and certain other compone nts whe n i ndicated in specifications are w arr ant ed fo r

a period of 90 days from the date of shipment to the c ustomer.

b. With respect to any repai r services rendered, Seller warrants tha t the parts repaired or

replaced will be free from defec ts in workmanship and materi al, under normal use, for a
period of 90 days from the date of shipment to the customer.

c. Seller does not provid e an y warra nty o n finis hed g oods m anuf acture d b y others. O nl y the

original manufactur er's wa rra nt y appl ie s.

d. Unless specifically authorized in a separate writing by Seller, Seller makes no warranty

with respect to, and shall have no liability in connection with, any goods which are
incorporated into oth er products or equipment by the Bu yer. All goods returned under
warranty shall be at the Buyer’s risk of loss, Seller’s factory prepaid, and will be returned
at Seller’s risk of loss, Buyer’s factory prepaid.

The foregoing is IN LIEU OF all other warranties and is subject to the conditions and
LIMITATIONS stated herein. NO OTHER EXPRESS OR IMPLIED WARRANTY OF
FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE.

THE EXCLUSIVE REMEDY OF THE USER OR PURCHASER, AND THE LIMIT OF THE
LIABILITY OF SELLER FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES IN
CONNECTION WITH THIS PRODUCT (INCLUDING CLAIMS BASED ON CONTRACT,
NEGLIGENCE, STRICT LIABILITY, OTHER TORT, OR OTHERWISE) SHALL BE THE
RETURN OF THE PRODUCT TO THE FACTORY OR DES IGNAT ED LOCAT ION AND THE
REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR
OR REPLACEMENT OF THE PRODUCT. IN NO EVENT SHALL SELLER BE LIABLE FOR
ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES. SELLER SHALL NOT BE
RESPONSIBLE FOR INSTALLATION, DISMANTLING, REASSEMBLY OR
REINSTALLATION COSTS OR CHARGES. NO ACTION, REGARDLESS OF FORM, MAY
BE BROUGHT AGAINST THE SELLER MORE THAN ONE YEAR AFTER THE CAUSE OF
ACTION HAS ACCRUED.

The purchaser a nd all u ser s a re d eemed to have acce pte d t he te rm s of this LIMITATION OF
WARRANTY AND L IABILIT Y, which contai ns th e com plete a nd e xclusive l imit ed w arrant y of
Seller. This LIMIT AT ION OF W ARR ANTY AND LIAB ILIT Y ma y not be am end ed or modifi ed
nor may any of its terms be waived except by a writing signed by an authorized
representative of Seller

Service Policy

Knowing that inope rative or def ective instr uments are as detriment al to Alnor as they are t o
our customers, our service policy is designed to give prompt attention to any problems. If any
malfunction is discove red, pleas e contact your nearest sales office or repr esentative , or call
Alnor’s Customer Service department at [phone] (USA) and (1)847-677-3500
(International).

ALNOR INSTRUMENT COMPANY
7555 North Linder Avenue
Skokie, Illinois 60077 USA
Toll-Free [phone] March 2001
Telephone [phone] Printed in USA
Fax [phone] Patent #4,982,605
Email: [e-mail] Part No. 116-159-255 Rev. 4
www.alnor.com © Copyright 2001 Alnor Instrument Company