GE Druck TRX-II, User Manual

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K319 Issue 2 EN-41
Englis
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range of the sensor. In general a dead weight tester is
recommended.
Calibration is performed at zero, 50% and full span only. Best
straight line fit is established by the polynomial factors as entered
during installation.
Plug the sensor in the calibrator and switch the unit on. Wait 15
minutes to allow the unit to stabilize. Press # and EXE
simultaneously to open the setup menu. Select Pressure Sensors
and press EXE. Select Calibration and press EXE. Select the
applicable sensor and press EXE. Expose the sensor to atmospheric
pressure and press EXE again to perform the zero calibration. Apply
the pressure for full range calibration. Dial on the TRX-II the total
weight stacked on the tester or the standard pressure calibrator
reading. Press EXE again. Do the same for half range calibration.
Verify the pressure reading on your next screen.
If calibration polynomials are entered for the negative range, this has
to be calibrated using the same procedure as for the positive range.
Press EXE to open the calibration date screen. Fill out the calibration
date questions and press EXE. Verify the date and press EXE again
to return to the sensor selection menu. Press CE to leave the
calibration mode.
Cleaning the pressure chamber
Use a water hand soap solution or a compatible solvent and flush the
pressure chamber. Do not use needles or other mechanical tools as
you may damage the isolation diaphragms.
Fault Finding Procedures
Opening and closing the calibrator housing
Remove the batteries and disconnect the unit from other equipment.
Take the four T/C wire screws out and release all visible Philips head
screws at the back and inside the battery compartment. Lift gently
the housing upper half off and put it aside.
To close the calibrator housing in reverse order the following must be
considered:
1.
Put the three printed circuit board spacers in place. Upper hand
and lower hand spacers have brass wire guide tubes; make sure
they fit into the mV terminals correctly.
2. Check the "battery type" selector switch position before turning
the unit on.
Fault location procedures
When the TRX-II does not work or does not work at all, it is
recommended to return the unit to one of the Druck Service Centres
or to your local distributor after you have checked the following;
Most of the problems associated with portable instruments are
usually related to power supply defects, blown fuses or displaced
connectors.
If the unit does not work at all:
1. When normally line powered, change to battery operation to
check the line adaptor.