Siemens 125-5033 - Manual (Page 17)

Product Overview
Siemens Building Technologies, Inc. 9
Figure 8. Pneumatic Actuator.
Analog Output-Pneumatic (AO-P) Module
The Analog Output-Pneumatic (AO-P) Module is an electric-to-pneumatic interface between
the Fume Hood Controller and the pneumatic actuator. The AO-P Module translates electrical
signals from the Fume Hood Controller into pneumatic signals that command the actuator.
The AO-P Module consists of two industrial grade solenoids that supply or bleed air to the
actuator by using a pulse modulation technique. See Figure 9. Minimum air supply to the AO-
P Module is 18 psi and the maximum is 30 psi. The valves are rated for 24 Vac.
5.00" (127.0mm)
3.70"
(94.0mm)
SUPPL
Y
COMMON EXHA
UST
SUPPLY
S
(SUPPL
Y)
18-30 PSI
R
(A
CTU
A
T
OR)
EXHAUST
FUM0240R1
Figure 9. AO-P Module.