Labconco Protector Demonstration Hoods 3945021 - Manual (Page 28)

Chapter 6: Maintaining Your Protector Demonstration Hood
Product Service 1-800-522-7658 24
Annually
• Have the hood validated by a qualified certification technician. See
Validating the Hood in Chapter 3.
• All monthly activities.
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.
Guardian 500 Component Identification
See Figure 6-1 on the following page.
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.