AFA4000/E VAV Airflow Controller / p.154
8.5.4 Volume (sash position sensor)
The Volume function is used to provide a volumetric 0-10 Vdc output relative to the fume
cupboard extract volume using a sash position sensor. It can only be used on a bench-type fume
cupboard with a single vertical sash.
Figure 72: Typical connection diagram
The sash position sensor is fitted with a mounting bracket that can be fitted in four different
orientations to enable the sensor draw wire to be correctly aligned.
1. Offer up the sensor to determine the best fixing position on the fume cupboard framework.
For best results, the sensor draw wire should run straight out of the sensor housing, in line
with the cable housing extension. In cases where the wire has run at an angle to the sensor,
make sure the angle is as small as possible so the wire does not rub on any part of the sensor
body including the cable housing extension
2. Mark the fixing holes in the framework and attach the sensor. The fixing bracket has two
0.37 mm (0.015") diameter fixing holes.
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