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PRICE FUME HOOD CONTROLLER - Manual
AIR VOLUME CONTROL VALVE
INSTALLATION INSTRUCTIONS
SP300 Calibration Curves - RDV
Calibration Equation
VP
- differential
pressure
at sensor,
inches w.g.
Q
- air flow
rate, cfm
at standard
density.
K
- calibration
constant
Unit Size
K
4
340
5
426
6
468
7
673
8
890
9
1155
10
1487
12
2141
14
3045
16
4074
( )
K
2
VP = Q
Notes:
1. Gauge taps are normally supplied
with the pneumatic controls to allow
field measurement of the differential
pressure at the sensor with a
manometer, magnahelic or other
measuring device.
If the terminal velocity controls utilize
a flow-through transducer, a proper
velocity pressure reading will NOT
be read at the gauge taps and the
calibration curves CANNOT be used
for field measurement. The flow-
through transducer operates on the
principle of mass flow rather than
pressure differential.
Controls utilizing a dead-ended
pressure transducer will allow field
measurement with the gauge taps
and calibration curves provided.
2. Setting flow limits for a differential
pressure of less than 0.02 inches
in NOT recommended. Stability
and accuracy of flow limits may not
be acceptable due to low velocity
pressure signal. Performance will
vary depending on the terminal unit
controls provided.
3. For field calibration of air flow limits
refer to the control contractors
documentation.
