Hazardous Area Oxymitter DR
Instruction Manual
SECTION 5
TROUBLESHOOTING
Install all protective equipment covers and safety ground leads after trouble- shooting. Failure to install covers and ground leads could result in serious injury or death.
5-1 OVERVIEW
Troubleshooting for the oxygen analyzer system is broken down to the main component level. In addition to the information in this section, instruc- tion bulletins for individual models also discuss troubleshooting.
For Models 218, 225, and 132 (analog), refer to
For Model 218A, refer to
For Model TC200, refer to
For Model 132 (digital), refer to
For Yokogawa (YEW) ZA8C Converter, refer to original converter documentation.
5-2 PROBE TROUBLESHOOTING
a.Probe Faults
Listed below are the five symptoms of probe failure.
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 accept-
able indication of the value of the oxy- gen test gas being applied during cali-
bration.5
4.The probe takes a long time to return to flue gas value after the calibration gas is turned off.
5.The probe heater temperature is un- stable.
b.Symptoms
Table
Table
SYMPTOM | CHECK | FAULT | REMEDY |
|
|
|
|
1. No response to oxy- |
|
|
|
gen concentration |
|
|
|
change when: |
|
|
|
Heater is cold and | Thermocouple continuity | Thermocouple failure | Replace thermocouple |
TC mV output is less |
|
| or return probe to |
than setpoint |
|
| Rosemount. |
| Cold heater resistance | Heater failure | Replace heater or return |
| |||
| should be 67 ohm to |
| probe to Rosemount. |
| 77 ohm |
|
|
| Triac O/P to heater | Failure of electronics | Check electronics pack- |
|
|
| age. |
Rosemount Analytical Inc. A Division of Emerson Process Management | Troubleshooting |
