TSI/Alnor 405-D User manual

Fume Hood Monitor

Alnor® AirGard® 405

Owner’s Manual

P/N 116159093, Rev. 12
May 2022

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iii

LIMITATION OF WARRANTY AND LIABILITY

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.

(effective April 2014)

(For country-specific terms and conditions outside of the USA,)
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:

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
mal-function is discovered, please contact your nearest sales office or representative,

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1

TABLE OF CONTENTS

General Description ......................................................... 2

Setup .................................................................................. 4

Installation ......................................................................... 6

General ........................................................................... 6

Tools Required ................................................................ 6

Procedure ........................................................................ 7

Calibration ......................................................................... 9

Equipment ....................................................................... 9

Procedure ........................................................................ 9

Step by Step Operation .................................................. 11

Alarm Acknowledgment ................................................ 11

Alarm Test ..................................................................... 11

Horn Disable (from keypad) .......................................... 11

Appendix A:

Maintenance & Troubleshooting .................................. 12

Maintenance .................................................................. 12

Troubleshooting ............................................................ 12

Service Policy ................................................................. 13

Ship To .......................................................................... 13

Specifications ................................................................. 14

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2

1

2

3

4

5

6

1

Figure 1:

Front view of instrument

General Description

The AirGard® 405 monitor is
designed to continuously monitor
airflow through fume hoods. This
permanently installed device
provides both visual and audible
alarms to alert you of abnormal
airflow conditions after the
instrument is calibrated for the
particular installation. A green
indicator on the front of the monitor
indicates normal flow conditions.
When flow conditions lower than
the setpoint are encountered, a red
indicator is activated along with an
audible horn. A test button is
provided at the front of the monitor
to allow you to check the operation
of the alarm. See Table 1 for a
description of each key function
located on the front of the monitor.

N O T I C E

For proper operation of the instrument, you must install and
calibrate the AirGard® 405 monitor. The entire manual
should be read first before proceeding with the actual
installation and calibration of the instrument.

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3

1. MOUNTING
SCREWS

Two screws secure the monitor to the
back plate which is then secured to
the fume hood.

2. AIR INLET

A portion of the air coming into the
hood passes through the air inlet and
across the flow sensors.

3. SETPOINT
ADJUST

This potentiometer is used to set low
flow alarm setpoint.

4. NORMAL FLOW
INDICATOR

This green indicator is illuminated
when air flow is greater than the
setpoint.

5. ALARM
INDICATOR

This red indicator is illuminated
approximately six seconds after
airflow is less than the setpoint.

6. TEST/RESET
BUTTON

If no alarm condition is present this
button will cause the red indicator to
be illuminated and will also cause the
horn to sound. If an alarm is present,
this button will silence the alarm.

Table 1: Description of features on front of monitor

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Setup

The AirGard® 405 fume hood
monitor contains several
configuration options. Two
connectors provide access to
remote control devices and
firmware configuration jumpers.
Observe the back of the
monitor. Locate the two
connectors at the left-center of
the printed circuit board marked
J3 and JP1. J3 is a polarized
header for connection to a
remote horn disable switch and
a set of single-pole single-throw
(SPST) relay contacts. JP1 is a
four-pole double-row header in
which shorting jumpers may be
inserted to configure firmware
options. Figure 2 illustrates
these connectors.

Poles 1 and 2 of J3 are the relay
contacts. Refer to specification section to determine the
relay contact ratings before making connections to the relay.
The relay contacts may be used to trigger a remote alarm
device. The default configuration of the contacts are
Normally Closed (NC) during normal airflow and Normally
Open (NO) during low-flow alarm conditions.

Poles 3 and 4 of J3 may be connected to a remote single­pole single-throw (SPST) switch to silence the horn. Closing
the switch will silence the horn only during an alarm
condition. Opening the switch restores the horn during an
alarm condition. It is recommended that this feature be used
to disable the horn for night-time operation or fume hood
exhaust motor shut-down periods.

Refer to the Step-by-Step Operation section for the Horn
Disable from keypad feature.

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Pole 1 of JP1 is used to select the relay configuration.
Without the jumper installed, the relay is Normally Closed
(NC) during normal airflow and Normally Open (NO)
during an alarm condition. Installing a shorting jumper
across pole 1 will cause the relay to be Normally Open
(NO) during normal airflow and Normally Closed (NC)
during an alarm condition. Install this jumper only when
the monitor is powered down. Insertion or removal of this
jumper while the monitor is powered up will not have any
effect on the relay configuration.

Pole 2 of JP1 is used to select the alarm-to-normal transition
delay option. Without the jumper installed, the transition
period from alarm to normal occurs in less than one second.
Installing a shorting jumper across pole 2 enables a nominal
five second delay before the alarm clears. Install this jumper
only when the monitor is powered down. Insertion or
removal of this jumper while the monitor is powered up will
not have any effect on the delay configuration.

Pole 3 of JP1 is used to permanently silence the horn. Note
that this pole is a parallel connection to poles 3 and 4 of J3.
Inserting the shorting jumper will silence the horn during an
alarm condition. It is recommended that this feature be used
to permanently disable the horn if the relay contacts are to
be used to trigger an alternate horn.

Pole 4 of JP1 is used to select either a horn disable or an
alarm input configuration. Inserting a shorting jumper
activates the alarm input option. The switch should have
normally open contacts and be connected to poles 3 and 4
of J3. Switch closure will activate the fume hood
monitor alarm.

N O T I C E

By selecting this option, the horn disable configuration
described previously is not possible. A shorting jumper
cannot be inserted across both poles 3 and 4 of JP1 or a
continuous alarm will occur.

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Figure 3:

Front view of fascia

Installation

General

Installation of the
AirGard® 405 monitor
requires several holes
to be drilled in the fume
hood using the back
plate as a template.

To monitor face velocity,
the air outlet port at the
back of the AirGard® 405
is connected to the
sidewall inside the fume
hood as shown in
figure 4. A flexible hose
is used to attach the air
outlet port to the interior
of the hood using a side
wall adapter. Polarity of
power terminal block is
as follows: 1 is Positive,
2 is Negative.

W A R N I N G

When using tools, ALWAYS wear proper eye
protection. Also, all necessary precautions
must be observed when installing or making
repairs in the vicinity of electrical equipment.

Tools Required

1. Electric drill

2. Drill bit size #37 (0.104”)

3. Phillips head screwdriver

4. Flat head screwdriver with 1/8” and 1/4" blade widths

5. Carbide hole saw, adjustable

6. 7/8” (0.875”) hole saw

7. 3/4” (0.750”) hole saw

8. Eye protection

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N O T I C E

If the monitor is to be installed in a hood with Hardiboard™
fiber-cement side panels or similar material, use special drill
bits designed for glass and other hard, abrasive materials.

W A R N I N G

Older hoods may contain asbestos. ALWAYS
take special precautions when dealing with
this material.

Figure 4:

Back view of fascia

Procedure

Step 1: Detach the back plate from

the monitor.

Step 2: Use the back plate
(figure 3) as a template to drill two
holes, 0.104" diameter, to secure
the back plate to the fume hood.

Step 3: Use the back plate as a
template to drill one hole, 0.75"
diameter, for airflow from the
monitor to the fume hood.

Step 4: If the power cable is routed
through the face of the fume hood,
use the back plate as template to
drill one hole, 0.875" diameter, to
route the power cable from the back
of the hood to the front. The power
cable can also be routed from the
front of the monitor, in which case
this hole is not needed.

Step 5: Drill a 0.515" hole in the side wall of the fume hood
approximately 6" behind the sash and even with its bottom
when fully open. Insert the side wall adapter from the inside
of the hood and lock with the lock ring (figure 4).

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Step 6: Connect the supplied air hose between the sidewall
adapter (figure 4) and the flow tube through the back plate
orifice (figure 3). Secure hose firmly and cut to length as
necessary to prevent accidental kinks and bends which can
affect calibration.

Step 7: Mount back plate to fume hood with the two self­tapping screws provided and assemble snap bushing into
wiring hole (if used).

Step 8: Connect the power cable (figure 3) to the terminal
block. The power cable is shown routed from the back of the
fume hood but may be also routed from the front side. If
using DC power terminals, 1 is Positive, 2 is Negative.

Step 9: Secure the monitor to the back plate using a screw
on the top and a screw at the bottom (figure 1). If front power
cable routing is used, be careful to place the cable into the
notch provided in the bottom of the front cover before
securing the screws.

Step 10: Plug the power supply to a power source.

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Calibration

Field calibration must be performed since each hood
installation is unique.

W A R N I N G

Calibration of this instrument should only 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 the
AirGard® 405 monitor must be completely
aware of the regulations and guidelines
specific to their application.

Equipment

1. Calibrated thermoanemometer
(TSI® Model 8575, APM360 or
equivalent).

2. Small screwdriver with a 1/8"
wide flat tip.

Procedure

Step 1: Double check installation

to ascertain that the AirGard 405
monitor, power supply and any
ancillary parts are properly
installed.

Step 2: Allow 20 minutes for the
monitor to warm up.

Step 3: Determine the low flow setpoint. This is the value of
where the monitor will first indicate a low flow condition. The
red indicator will be illuminated for this value. Refer to
facility’s Industrial Hygiene Officer for the proper setpoint.
For this example, assume the indicator is to be illuminated
when the flow is 70 fpm.

Figure 5:

Typical installation

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Step 4: Adjust fume hood airflow to the low flow setpoint (as
described in Step 3). One method to lower the face velocity
of the hood is to close the volume damper (if available) in
the ductwork.

W A R N I N G

This method is only used as a temporary
condition to set the low flow point. Make
sure airflow is restored to proper level after
calibration.

Step 5: Using a properly calibrated thermoanemometer,
determine the velocity through the face of the hood by taking
a detailed velocity traverse. Divide the face area of the hood
into equal partitions. One reading per square foot of face
area is recommended for an accurate traverse. Compute the
average velocity for this area. For this example, assume that
the traverse resulted in an average velocity of 70 fpm.

Step 6: If the red indicator is illuminated, slowly turn the
adjustment screw counterclockwise until the green indicator
illuminates. If the green indicator is illuminated, slowly turn
the adjustment screw clockwise until the red indicator
illuminates; now slowly turn the adjustment screw
counterclockwise until the green indicator illuminates. It is
important that these adjustments be done in small
increments, at intervals of about ten seconds each, to allow
for the delayed reaction of the alarm.

Step 7: Restore fume hood airflow to a normal level.

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Step-By-Step Operation

Alarm Acknowledgment

The horn and red indicator will turn on approximately six
seconds after an alarm condition is detected. To mute the
horn, press and release the TEST/RESET button. Note that
after an alarm condition has been detected, the red indicator
will stay on. The horn will remain muted until airflow is
restored to normal levels.

Alarm Test

When no alarm condition is present, the alarm can be tested
by pressing the TEST/RESET button. While the button is
pressed, the indicator and horn will be activated.

Horn Disable (from keypad)

Under any operating condition, the horn may be disabled by
pressing the keypad for more than 5 seconds. The monitor
will continue to drive the appropriate LEDs at a flash rate of
2 pulses per second. The horn will stay in the disabled mode
until either of the following two conditions occur:

• a single, momentary press of the keypad

• power to the monitor goes off and then back on.

The relay output will still be active with its contacts closed or
open depending on the current flow conditions.

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APPENDIX A: Maintenance & Troubleshooting

Maintenance

The outside of the AirGard® 405 monitor may be wiped clean
with mild soap (dish washing detergent) and water on a
damp cloth to remove finger marks, oils or residue. DO NOT
use abrasives or solvents. DO NOT immerse the monitor or
allow liquids to enter the case. Dry the monitor thoroughly
after cleaning.

Troubleshooting

Symptom

Check

NO INDICATORS

Power supply not plugged into AC
supply. Plug in power supply.
Power supply cable not properly
terminated into terminal block.

NO AUDIBLE ALARM

Horn has been silenced using the
TEST/RESET button. Alarm
condition must clear before horn
may be re-activated. J3 poles 3
and 4 may be closed. Pole 3 of
JP1 may have shorting jumper
unintentionally installed. If
permanent horn silence is not
desired, disconnect power, remove
pole 3 shorting jumper and
reconnect power.

WRONG ALARM
SETPOINT

Potentiometer was not properly
adjusted. Repeat calibration steps
outlined in Calibration section.

CONTINUOUS
ALARM

Blower speed has changed. Adjust
if required. Check calibration using
traverse technique. Recalibrate
monitor as instructed in Calibration

section of manual if required.

Shunts are in both positions 3 and
4 of JP1. See Setup section.

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Symptom

Check

HORN SILENCE WILL
NOT STAY ON

An alarm condition must be
continuously present before the
horn can be silenced. If flow
conditions fluctuate near the alarm
setpoint, the alarm will
automatically reset itself. Action
should be taken to bring fumehood
airflow to proper condition, or
recalibrate the alarm setpoint.

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14

AIRGARD® 405 MONITOR SPECIFICATIONS

Instrument Dimensions 6.05" high x 3.15" wide x 1.8"

deep (15.4 x 8.0 x 4.6 cm)

Instrument Weight 8 oz (0.23 kg)

Shipping Weight 1 lb. 8 oz (0.68 kg)

Green Indicator 0.75" x 0.5" (1.9 x 1.3 cm)

Red Indicator 0.75" x 0.5" (1.9 x 1.3 cm)

Audible Horn 85 dB @ 4" (10 cm)

Alarm Setpoint Set point 80 fpm recommended

Operating Temperature 55°F to 86°F (13°C to 30°C), 5%

to 95% RH, non-condensing

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

5% to 95% RH, non-condensing

Nominal Input Voltage 12.0 ± 1.0 VDC or 9.0 ± 0.5 VAC

Nominal Input Current 0.12ADC @ 12 VDC input

Transformer Specification 120 VAC ± 10%. 60 Hz input

9 VAC nominal output.

0.50A max.

Relay Contacts 1.2A @ 200 VDC max.

Monitor with 24V Input Module

(Factory Installed)

Nominal Input Voltage 22.0 ± 4.0 VDC or 24.0 ±

6.0 VAC

Nominal Input Current 0.12 ADC @ 22.0 VDC input

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