Alnor AirGard 405, Owner'S Manual

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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 

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Figure 1: 

Front view of instrument 

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