AFA4000/E VAV Airflow Controller / p.168
9.1.1 PIR sensor
The Personnel Sensor is a Passive Infra-Red (PIR) occupancy detector that detects the presence
or absence of the fume cupboard operator. It is used to change the control set point whenever
the fume cupboard is unoccupied.
On power up, the Personnel Sensor detects the reflection characteristics of the environment
within its field of view and stores this information as reference background data. The sensor
then re-detects the background every three minutes, so that if a stationary object, such as a
stool, is left in the field it will become part of the background and ignored by the sensor.
Refer to the manufacturer's data sheet or separate PIR specification sheet for installation
details.
9.2 Optional input function - temperature sensor
The AFA4000/E can be fitted with a temperature sensor. The sensor displays the fume cupboard
temperature and can produces high and low temperature alarms. The temperature display can
be hidden or shown with the airflow velocity display.
High and Low temperature alarms can be set with relay outputs.
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