HART HK51, Руководство по эксплуатации

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7. Troubleshooting of transmitter maintenance
7.1 Instrument maintenance
7.1.1 Soft maintenance
The HART smart transmitter is a smart product with parameters open to the
user. Users can adjust zero point, set range, set damping, and even recalibrate
according to the actual situation. When core parameters are modified or
confusing, it will cause a soft fault. In this case, please refer to the previous
section for debugging and return to normal operation.
When the actual situation needs to be re-zeroed, please remove the case cover,
adjust with buttons, or use software to debug directly. The specific adjustment
method is carried out according to to the above-mentioned button operation
description and software debugging method.
7.1.2 Hard maintenance
Generally speaking, the sensor components, main circuit board and display head
are not repairable on site. Hardware maintenance of the user is limited to circuit
connection inspection, transmitter cleaning, replacement, and block terminal
inspection.
◆ Inspection of process sensor body
Note the following:
(1) Remove the transmitter from operating points before disassembling the
sensor body.
(2) Temperature and pressure circulation experiments shall be performed after
reassembly to ensure accuracy of the transmitter.
(3) Remove four bolts to disassemble the pressure chamber.
(4) Clean the isolation diaphragm with a soft cloth or a mild detergent and rinse
with water.
(5) To facilitate installation, the pressure chamber and fittings can be rotated or
mounted reversely.
◆ Block terminal inspection
Unscrew the rear cover to expose the terminal block. Unscrew the two
positioning screws and remove the terminal cover to expose the board. Check if
the wiring board connection is correct and reliable. It is mainly concentrated on
assembly of the feedthru capacitor and the test diode.
7.2 Troubleshooting
In the case of a transmitter failure, the following steps can help identify cause of
the problem. It also helps determine if it is necessary to remove for repair. These
materials help diagnose and repair the three basic symptoms of the problem.
Firstly handle conditions that are most easily checked for each symptom. Please
contact our service center if it is difficult to repair.
Monocrystalline Silicon High Stability Transmitter