Ampcontrol Gasguard 65-6551-CH4 Series, Руководство пользователя

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Ampcontrol Pty Ltd
– ABN 28 000 915 542
GASGUARD CH4 GAS SENSOR USER MANUAL
GSB076 Version 6
– March/2019
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version Page 20 of 25
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6.2.2 Corrective Maintenance
During maintenance and subsequent recalibration, it is important to ensure that appropriate steps are
taken to prevent the sensor output signal from initiating a fault, warn or alarm condition, or
inappropriately driving an equipment control function. Consult the relevant equipment user manuals for
specific details on how to isolate alarms and functions.
There are only two active replaceable units in the sensor system, the Amplifier Electronics PCB and the
gas sensor. Therefore, fault isolation is limited to the following possible faults and remedies.
Table 4: Corrective Maintenance
– Possible Faults
Fault Rectification
4-20mA output not
functioning
a) Verify all connections are correct and are not damaged or
disconnected.
b) Verify that the fault does not lie with connected equipment such
as controllers etc.
c) Verify the supply voltage applied to the Amplifier PCB is within
specification.
d) Check for loose plug and terminal connections.
e) If the above checks indicate no faults, replace the Amplifier
electronics PCB.
Sensor cannot be
Spanned or Zeroed
a) Check the supply voltage to the sensor is within specification.
b) Check for loose plug and terminal connections.
c) Verify the calibration gas being used is of the correct type and is
within its expiry date
d) Verify that the gas entry ports are free from obstruction by water
or debris.
e) If the above is correct and the problem persists, replace the
sensor
f) If the sensor still cannot be Spanned or Zeroed, replace the
Amplifier PCB.
Erratic Output
a) Check that voltage and polarity applied to the Amplifier PCB is
correct. Also, check that there are no severe voltage swings,
indicating an intermittent fault in the field wiring or control unit.
b) Check for loose plug and terminal connections.
c) If the above is correct and the problem persists, replace the
sensor.
d) If the output is still erratic, replace the Amplifier PCB.
6.3 Disposal
ENVIRO The electronic equipment discussed in this manual must not be
treated as general waste . By ensuring that this product is disposed of
correctly you will be helping to prevent potentially negative
consequences for the environment which could otherwise be caused by
incorrect waste handling of this product.