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Instruction Manual
IB-106-300NH Rev. 4.3
May 2005
6-2 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
Table 6-1. IFT Status Codes
Off Heater power has been turned OFF by the electronics. The display shows 0% O
2
. Several con-
ditions may cause the OFF status:
1. The cell heater temperature is below -50°C. The thermocouple wires may be reversed.
2. The cell temperature is more than 70°C above the set point. The heater is out of control.
The triac module may have failed.
3. The cell heater thermocouple voltage has remained within +1.5 mV for more that 4 minutes.
The thermocouple may be shorted.
4. The AD590 voltage is below 50.0 mV (50K or -223°C). The AD590 is not connected.
5. The AD590 voltage is above 363 mV (363K or 90°C). If HPS is used with IFT, then IFT in-
terconnect board has JM1 in position connecting two AD590s in parallel.
PrbEr The probe is disconnected or cold, or leads are reversed.
HtrEr There is a fault within the heater system. The heater temperature is more than +25°C from the
set point. When the unit is first turned ON, HtrEr is normal. The heater may take 0.5 to 1.0
hours to warm up.
InCal The system is currently undergoing calibration. If Output Tracks is set to YES, the output will
show changing O
2
values. If Output Tracks is set to NO, the output will hold the pre-calibration
value.
LowO
2
The measured O
2
value is below the low O
2
alarm limit. The problem may be in the probe or the
process.
HiO
2
The measured O
2
value is above the high O
2
alarm limit. The problem may be in the probe or
the process.
NoGas Test gas pressure is too low. Pressure switches are set to trigger this alarm at 12 to 16 psig (83
to 110 kPa gage). Test gas regulators are usually set at 20 to 25 psig (138 to 172 kPa gage).
Possible causes are:
1. At least one test gas pressure switch is open.
2. A test gas cylinder is empty.
3. There is an MPS or piping failure.
4. If MPS is not connected, CALRET and NOGAS signals should be jumpered on the intercon-
nect board.
CalEr An error occurred during the last calibration. The error may be one of the following:
1. The new calculated slope value is outside the range 34.5 to 57.6 mV/decade.
2. The new calculated constant value is outside the range +20.0 to -20.0 mV.
3. The test gas pressure switch opened during calibration.
Ensure that the proper test gases are being used, and that the gas flows are set properly. Refer
to Appendix D for additional MPS troubleshooting information.
ResHi The resistance calculated during the last good calibration was greater than the High Resistance
Alarm limit set in the calibration setup. The resistance limit may be set wrong, or there is a
problem with the probe.
Ok Operation appears to be normal.
(blank
screen)
A possible failure within the IFT. Check the LED on the microprocessor board to help isolate
problems. See IFT Problem in the troubleshooting tables.