Siemens 125-5033 - Manual (Page 16)

Fume Hood Controller Owner's Manual
8 Siemens Building Technologies, Inc.
Low Speed Electronic Actuation
Alternately, when speed of response is not an issue, slower speed electronic actuation may
be used. This can be used when the change-of-state between High and Low can take place
in 15 seconds or more.
Low Speed Actuator (GMA13x).
Pneumatic Actuation
The pneumatic actuator is connected to an exhaust flow control device in the fume hood
exhaust duct. The standard pneumatic actuator (Figure 8) used with the Fume Hood
Controller is the No. 3 unit. The No. 3 actuator is used because of its small size and quick
response time. The actuator has a deep drawn aluminum housing, a rubber diaphragm, and
a spring return rated at 8 to 13 psi. Pneumatic actuation requires two components, the
actuator and the transducer (AO-P module).
WARNING:
Due to the design, parameters and the response times required by the
Fume Hood Controller, the No. 3 actuator always must be replaced
with the same part or a Siemens Building Technologies, Inc. approved
equivalent. Any modifications that are not approved may affect the
safety and performance of the Fume Hood Controller.