WSPC USER INTERFACE MANUAL SECTION 7
64
P2 PRESSURE TRANSDUCER CALIBRATION
The Line pressure transducer input measurement is
assigned to analog input AI4 at the controller. This
pressure transducer measures the output line
pressure at the compressor main header. Over time,
the pressure transducer may vary slightly producing
an inaccurate reading at the controller. Periodically
and prior to operating multiple controllers in a
sequence, the controller should be calibrated to
reflect the same pressure measurement as that
measured at the Line transducer location. The
calibration should be performed when the system is
at a stable pressure with minimal load on the output
lines. Use the following steps to calibrate the WS
Controller Line pressure reading (refer to Figure 7-
11):
1. Measure the parameter (Line pressure) at
the sensor (transducer) location using an
independent certified gauge.
2. At the WSPC interface, observe the Line
pressure reading in the “Compressor Status
Bar.” Compare this reading with the mea-
surement at the transducer location.
3. If the measurement on the external gauge at
the transducer does not match the discharge
pressure reading at the PC, click on the
“Admin” tab to access the Administrator
Adjustments display.
4. Under the category “Analog Signal Zero
Trims,” highlight the values in the analog
sensor field labeled AI4 (Line pressure
input).
5. Enter the value necessary to increase or
decrease the Discharge reading at the PC to
equal the measurement at the transducer.
The calibration variance limits are –7.5 to
+7.6.
6. Press “Enter” or click the mouse outside of
the entry field to attach the variance value.
The variance value will be added to or sub-
tracted from each measurement received by
the controller. The value change can be
immediately observed at the controller and at
the PC.
Figure 7-13: Administrator Adjustments
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