INSTALLATION NOTES :-
1. The AFA 500 must be positioned where it can " see " the room pressure of
the laboratory.The back connection spigot of the sensor is designed to accept
a 25mm ( 1” ) OD tube which should be connected to the inner
chamber of the fume hood. (This tube and fittings is known as the " vent kit " )
The
ideal position
for the end of the 25mm ( 1” ) tube for most fume hoods is
6” back from the sash glass and 2” higher than the maximum sash opening
height through the inner side wall.
2. If possible mount the sensor on the front of the fume hood and use a short
length of tube. Tube lengths of more than 30” or smaller diameter will restrict
the airflow through the sensor. This will lead to too much sensitivity being
required to calibrate the unit which can lead to some instability of the reading
or incorrect readings at low velocities.
4. The sensor should not be mounted in a position were it is subject to drafts
from the laboratory air input or ventilation system.
14
