Labconco Guardian 500 Airflow Monitor - Manual

Labconco Instruction Sheet 3909501, Rev. B, ECO F597 1 of 6
LABCONCO CORPORATION 8811 Prospect Ave, Kansas City, MO 64132
(816) 333-8811, Fax (816) 363-0130, (800) 821-5525
Guardian™ 500 Airflow Monitor Kit No 3944700 or 3944701
The Guardian 500 Airflow Monitor is designed to continuously monitor airflow through
enclosures and fume hoods. This permanently installed device provides both visual and audible
alarms to alert the user of abnormal airflow conditions. A green light on the front of the monitor
indicates normal flow conditions. When flow conditions lower than the set point are encountered,
a flashing red light is activated along with an audible alarm. To temporarily mute the audible
alarm, press and release the test/reset button. The Guardian 500 Airflow Monitor has a built-in
sensor, 3 relay inputs and 1 relay output. The relay inputs can be configured for night setback,
external alarm, and sash high alarm. The night setback features disables the alarm. The relay
output is configured for Low Air Alarm.
Component Identification
1. Air Inlet A portion of the air coming into the enclosure passes through the air
inlet and across the flow sensors.
2. Normal Flow Indicator This green light indicates normal flow conditions.
3. Alarm Indicator This red light is activated approximately 10-30 seconds after the low
flow set point is reached. Low flow set points are 10-20 fpm below
normal flow.
4. Mute Button If no alarm is present, this button will cause the red lamp to light and
the audible alarm to sound. If an alarm is present, the button will
silence the audible alarm.
5. Adjustment for Alarm Set
Point This potentiometer is used to set the low flow indicators for the
alarm. It is adjusted with a small screwdriver.
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3
1
4
5
Figure 1
Component Identification