D12
EX-IR
Gas Transmitter with IR Smart Sensor
Dec 2019 ( 85-0004 Rev A)
55
General Trouble
The table below lists troubles for which no message is displayed.
Table 15. General Trouble
Trouble Messages
Table 16 describes the trouble messages and lists the corrective action codes, which are listed below.
Table 16. Trouble Messages
Trouble
Description
Corrective Action(s)
Gas Signal Err
The analog-to-digital converter channel assigned
to the sensor’s gas
concentration output signal
has failed, or is out of range.
1-3,4,6,8
LCD Busy Error
The LCD driver chip cannot recover from an
internal error.
1-3,9,7,8
SPI/I2C Bus Error
An internal CPU bus has faulted.
1-3,7,9
Tmp. Signal Err
The analog-to-digital converter channel assigned
to the sensor’s temperature output signal has
failed, or is out of range.
1-3,4,6,8
Sensor (-)Range
The sensor has drifted -20% range (below zero).
See
Zero calibrate the sensor
4,6,8
Sensor Removed
The sensor cannot be detected.
2-4,6,8
Sensor NVM Err
One or more configuration settings in the sensor
memory do not pass checksum test.
4,6,8
Sensor Config
One or more sensor configuration settings are
outside of their expected range.
4
Generator NVM
The generator’s non
-volatile memory is corrupt.
5,6,8
Problem
Corrective Action
Transmitter won’t
start.
1.
At power on, transmitters powered in 3-wire or 4-wire mode demand 2 times the normal
amount of supply current. If the supply is not sized properly, transmitters may not power on,
or may produce a fault in the external power supply. If this is suspected, try starting
transmitters one at a time.
2.
Check that each transmitter has at least 12VDC between pins 5(+) and 6(-) of TB1 on its
Power Supply board. This is more easily done using
temporary
lead wires from the connector.
Gas reading
unstable, drifting.
Ground loops are a common cause of unstable readings, and may represent a dangerous
condition. A ground loop occurs most often when a drain wire, cable shield, DC supply (-), or any
other wire makes contact to two or more transmitter housings, remote sensor housings, receivers,
power supplies, or metal cable conduits. Metal housings must be bonded to earth ground for
safety, and any difference in earth potential between the two points will cause current to flow in
the wire or shield. This current might th
en cause errors in the transmitter’s high
-gain analog input,
or possibly exceed the rating of the conductor.
