AFA4000/2
Airflow Monitor / p.39
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Objects are detected when infra-red light from the transmitter is not detected by the
receiver due to an obstruction in its path.
Figure 9: Sash Light Curtain Transmitter and Receiver
A separate Sash Light Curtain Control Box includes a sensitivity potentiometer that
allows the beam sensitivity adjusted to sense glass or other objects that are partially
transparent to infra-red light.
Figure 10: Sash Light Curtain Control Box
4.3.5
Under Sash sensor
The Under Sash Sensor is an alternative to the Sash Light Curtain which detects whether
the opening below the sash is clear from obstructions before the sash is closed.
A sensor on one side of the fume hood detects the reflection of a beam of light from a
self-adhesive strip of retro-reflective tape mounted on the opposite inside wall of the
fume hood.
Summary of Contents for AFA4000/2
Page 1: ...AFA4000 2 Airflow monitor Installation and operating manual Issue 1 ...
Page 50: ...AFA4000 2 Airflow Monitor p 50 Figure 21 AFA4000 2 typical connection diagram ...
Page 51: ...AFA4000 2 Airflow Monitor p 51 Figure 22 AFA4000 2 AS typical connection diagram ...
Page 52: ...AFA4000 2 Airflow Monitor p 52 5 4 Dimensions Figure 23 AFA4000 2 and AFA4000 2 AS dimensions ...
Page 53: ...AFA4000 2 Airflow Monitor p 53 Figure 24 SM7 airflow sensor dimensions ...
Page 90: ...AFA4000 2 Airflow Monitor p 90 6 10 Auto Sash System Control Box general wiring diagram ...
Page 127: ...AFA4000 2 Airflow Monitor p 127 ...
Page 140: ...AFA4000 2 Airflow Monitor p 140 Figure 69 Typical connection diagram ...
Page 144: ...AFA4000 2 Airflow Monitor p 144 Figure 70 Connection diagram with RS232 485 converter ...