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Troubleshooting
Electrical Interference
This sensor has been designed to be highly resistant
to EMI/RFI using multiple stages of filtering and
protection. However, in extreme environments, some
noise pickup can occur directly through the sensor.
Insure that the bare shield wire of the instrument cable
is properly connected at the readout unit. See Figure
10, Note 2 for AirScanTMiR meter test points.
Figure 33. Troubleshooting
AirScan iR - Industrial
Sensor On-board Diagnostic System
It is possible to have the mA output fail during normal
run mode. In some instances a mA output circuit
that is incorrectly setup can supply 4 mA to the
load reasonably well; however, an incorrect circuit
arrangement could not be capable of driving 20 mA
to the load when required. Therefore, the system will
place a fault condition out on the mA loop output and
flash the "mA fault" LED indicating the output wiring is
not correct or load resistance is too high.
To properly ensure the load is correct, during the 20
mA or (high) 4/20 mA integrity test, the output circuit
dynamic range is tested to its fullest extent. If the mA
fault LED blinks during this test, the load resistance is
too high or power supply voltage is too low.
In the case of a mA Failure during Run mode, the "mA
fault" LED will blink Fast.
In the case of a mA failure during the mA output test,
the "mA fault" LED will also blink Fast. See figure at
the top of the next page.
21
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