Waters Prep Series Installation And Maintenance Manual page 126

A triangular (sawtooth) trace appears on the chart recorder if the test
succeeds.
3. Press ENTER to proceed to the next test.
IEEE-488 address test
This test verifies that the system is reading the current address. When the
test begins, the current address appears on the screen.
To perform an IEEE-488 address test:
1. Change the position of any IEEE-488 address DIP switch on the back of
the controller panel. The address shown on the screen will change.
2. Repeat step 1 for each DIP switch.
3. Press ENTER to proceed to the next test.
Pressure transducer calibration test
Accurate operation requires that the pressure transducer is correctly
calibrated to your system. The calibration procedure shows you how to adjust
transducer slightly. Do this if you experience high or low pressure shutdowns
to determine that the pressure transducer is causing your problem.
Turn the screw slowly, because the screen's response to the adjustment
Tip:
lags. A transducer output that falls below 0 psi can cause the screen to freeze.
If the screen seems frozen, turn the potentiometer to increase the pressure
value above 0 psi. The ideal setting is 6 to 24 psi.
To perform a pressure transducer calibration test:
1. Disconnect the column from the flow path by turning the Purge valve to
PUMP Purge.
2. Start the Prep system and go to the DIRECT screen.
3. Set the flow rate to 0.0 mL/min and observe the pressure reading on the
screen. The pressure value should be 0 psi.
The pressure value can read 0 psi even when the pressure
Tip:
transducer is not set properly, because the screen does not display
negative pressure.
4. Adjust the pressure transducer:
3-42 Troubleshooting, Testing, and Maintenance