Alnor AirGard 405 User manual

Model 405 AirGard®
Fume Hood Monitor
OWNER’S MANUAL

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 and material for a period of
twenty four (24) months, or the length of time specified in operator's manual, from the date of
shipment to the customer. This limited warranty is subject to the following exclusions:
a. Batteries and certain other components when indicated in specifications are warranted for
a period of 90 days from the date of shipment to the customer.
b. With respect to any repair services rendered, Seller warrants that the parts repaired or
replaced will be free from defects in workmanship and material, under normal use, for a
period of 90 days from the date of shipment to the customer.
c. Seller does not provide any warranty on finished goods manufactured by others. Only the
original manufacturer's warranty applies.
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 other products or equipment by the Buyer. 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 DESIGNATED LOCATION 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 and all users are deemed to have accepted the terms of 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 or modified
nor may any of its terms be waived except by a writing signed by an authorized
representative of Seller
Service Policy
Knowing that inoperative or defective instruments are as detrimental to Alnor 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
Alnor’s Customer Service department at [phone] (USA) and (1) 651-490-2811
(International).

1
1
TABLE OF CONTENTS
General Description ......................................................................2
Setup...............................................................................................3
Installation .....................................................................................5
General ........................................................................................5
Tools Required ............................................................................5
Procedure.....................................................................................6
Calibration.....................................................................................7
Equipment....................................................................................7
Procedure.....................................................................................7
Step by Step Operation.................................................................9
Alarm Acknowledgment..............................................................9
Alarm Test ...................................................................................9
Horn Disable (from keypad)........................................................9
Appendix A:
Maintenance & Troubleshooting ...............................................10
Service Policy...............................................................................11
Ship To ......................................................................................11

2
2
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.
Note: 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.
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
1
Figure 1:
Front view of instrument
5
4
1
2
6
3

3
3
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 single-pole 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.

4
4
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.
Note: 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.

5
5
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.
WARNING
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 ¼” blade widths
5. Carbide hole saw, adjustable
6. 7⁄8” (0.875”) hole saw
7. ¾” (0.750”) hole saw
8. Eye protection
Note: 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.
WARNING
Older hoods may contain asbestos. Always take special
precautions when dealing with this material.
Figure 3:
Front view of fascia
Figure 3:
Front view of fascia

6
6
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).
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 self-tapping
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.
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.

7
7
Calibration
Field calibration must be performed since each hood installation is
unique.
WARNING
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.
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.
Figure 5:
Typical installation

8
8
WARNING
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.

9
9
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.

10
10
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.
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.

11
11
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 all service requests. If any malfunction is
discovered, please contact your nearest sales office or representative, or
call TSI’s Customer Service department at [phone] (U.S. and
Canada only).
Ship to:
TSI Incorporated
Alnor Products
500 Cardigan Road
Shoreview, MN 55126 USA
Toll-Free [phone]
Telephone [phone]
Fax [phone]
Email: [email protected]
www.alnor.com

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 (0.23kg)
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 ± 1.0VDC or 9.0 ± 0.5VAC
Nominal Input Current 0.12ADC @ 12VDC input
Transformer Specification 120VAC ± 10%. 60 Hz input
9VAC nominal output. 0.50A
max.
Relay Contacts 1.2A @ 200VDC max.
Monitor with 24V Input Module
(Factory Installed)
Nominal Input Voltage 22.0 ± 4.0VDC or 24.0 ± 6.0VAC
Nominal Input Current 0.12ADC @ 22.0VDC input

TSI Incorporated
Alnor Products
500 Cardigan Road
Shoreview, MN 55126 USA
Toll-Free [phone]
Telephone [phone] February 2003
Fax [phone] Printed in USA
Email: [email protected] Part No. 116-159-093 Rev. 8
www.alnor.com © Copyright 1997–2003 TSI Incorporated