Hazardous Area
X-STREAM O
2
Transmitter
5-4
Instruction Manual
IM-106-910C, Rev. 1.0
November 2009
IDENTIFYING AND
CORRECTING FAULT
INDICATIONS
There are two types of alarms; recoverable and non recoverable. If an
existing alarm is recoverable, the alarm-active indication will disappear when
the alarm condition no longer exists. If an alarm is not recoverable, the alarm
indication will continue to be displayed after the cause of the alarm condition
is corrected. Loop power to the transmitter must be cycled to clear a
non-recoverable alarm.
For a Hazardous Area X-STREAM O
2
Transmitter without an optional Xi
Enhanced Interface, alarm messages are accessed via the HART/AMS
communication menu. A listing of the alarm/fault messages and the related
fault status descriptions are shown in Table 5-1.
For a Hazardous Area X-STREAM O
2
Transmitter with the optional Xi
Enhanced Interface, alarm messages are displayed on the Xi interface
display window when the alarm status display is accessed via the Xi interface
menu. A listing of the alarm/fault messages and the related fault status
descriptions are shown in Table 5-2.
The following are five general fault symptoms:
1. The system does not respond to changes in the oxygen concentration.
2. The system responds to oxygen changes but does not give the correct
indication.
3. The system does not give an acceptable indication of the value of the
oxygen test gas being applied during calibration.
4. The probe takes longer than normal to return to flue gas value after the
calibration gas is turned off.
5. The probe heater temperature is unstable.
Fault conditions that give no fault indication and that allow the probe to pass
calibration are listed and discussed after Tables 5-1 and 5-2.
Table 5-1. Diagnostic/Unit Alarm Fault Definitions - Transmitter without Xi Enhanced Interface
Message
Status
Self Clearing
NV Mem Fail
A checksum error was detected in the nonvolatile memory configuration data when the unit was
turned on.
No
Factory Mode
On transmitter board, SW1, position 1 is set to "ON". This setting should only be used in the
factory.
No
Board Temp Hi
The transmitter electronic board temperature reading is above 126°C.
No
O2 Sensor Open
The cell impedance voltage is reading less than -1.1 VDC indicating the O2 sensor wires may be
disconnected or the O2 sensor junction may be open.
Yes
O2 TC Open
The O
2
cell heater thermocouple voltage is reading more than the hardware configured threshold
voltage. This indicates the thermocouple wires may be disconnected or the thermocouple junction
may be open.
Yes
O2 Temp Low
The heater temperature is below the minimum temperature. The predefined low temperature
threshold is the 726°C.
Yes
O2 Temp High
The heater temperature is above the predefined temperature threshold of 750°C.
Yes
O2 T/C Shorted
The O
2
sensor heater temperature thermocouple voltage is shorted.
Yes
O2 T/C Reversed
The O
2
sensor heater temperature thermocouple voltage is reading a negative voltage indicating
the thermocouple wire connections may be reversed.
Yes
CPU Voltage Low
The transmitter CPU voltage is less than 2.7 V indicating the CPU voltage is too low.
Yes
CPU Voltage High
The transmitter CPU voltage is more than 3.3 V indicating the CPU voltage is too high.
Yes
Htr Voltage Low
The heater voltage for the O
2
cell heater is below 35 volts.
Yes
Htr Voltage High
The heater voltage for the O
2
cell heater is above 264 volts.
Yes
Содержание Rosemount X-STREAM O2 Transmitter
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