Re-Calibrating The Pressure Transducer - Arjohuntleigh FLOWTRON UNIVERSAL Service Manual

Testing
8

Re-calibrating the Pressure Transducer

Note: This procedure is carried out without opening the pump case.
8.1 Prepare the calibration test equipment (Refer to Page 6, Section 6).
8.2 Make sure that no calibration test equipment or other garments are connected to either pump
hose set assembly.
8.3 Initialise the pump (Refer to Page 1, Section 1).
8.4 Connect the right hose set assembly on the pump to the garment connector on the test
equipment (Refer to Figure 21).
Note: The calibration test equipment must only be connected to the right hose set assembly.
Do not connect anything to the left hose set assembly.
8.5 Press the "hidden" Service button on the membrane panel (Refer to Page 5, Section 4) to
access the service screen on the LCD display (Refer to Figure 25).
8.6 Using the Down and Up buttons below the LCD display (Refer to Page 5, Section 4), scroll
down the list of options to Calibrate PT, and select it using the
A new list of options will appear (Refer to Figure 26).
8.7 Before continuing with the re-calibration procedure, refer to the two Calibration Data values on
the LCD display, and make a note of the Zero and Gain values (Refer to Figure 26).
Note: If the re-calibration procedure goes wrong, you can set the Zero and Gain values back to
their original values, and then start the re-calibration procedure again.
8.8 Make sure the external pressure meter shows zero pressure.
8.9 Check the value of the Output Pressure shown on the LCD display (Refer to Figure 26). It
should show zero pressure. If it does not show zero pressure, then adjust the zero calibration
factor of the pump as follows:
8.9.1 To increase the Output Pressure value, scroll through the list of options to Increase
Zero. Each time the
8.9.2 To decrease the Output Pressure value, scroll through the list of options to Decrease
Zero. Each time the
8.9.3 As these adjustments are being made to the Output Pressure value, the Zero value
on the Calibration Data will change (Refer to Figure 26).
Chap 4
Page 10
Figure 25 - LCD Display - Calibrate PT
Figure 26 - LCD Display - Calibration Data
button is pushed, the Output Pressure value will increase.
button is pushed, the Output Pressure value will decrease.
SER0009
Flowtron Universal Service Manual
button below the LCD display.
Output Pressure
Calibration Data
(Zero, Gain)
(typical values)
Issue 2
Sep 2009