Chapter 5 Troubleshoot; No Response To Oxygen Concentration Change When Heater Is Cold And Thermocouple Mv Output Is Less Than Setpoint; No Response To Oxygen Concentration Change When Heater Is Hot And Thermocouple Mv Output Is At Setpoint ±0.2 Mv - Emerson Rosemount Oxymitter DR Reference Manual

Reference Manual
00809-0100-4880
5 Troubleshoot
WARNING
Failure to install covers and ground leads could result in serious injury or death.
Install all protective equipment covers and safety ground leads after troubleshooting.
5.1 No response to oxygen concentration change
when heater is cold and thermocouple mV
output is less than setpoint
Potential cause
Thermocouple failure
Recommended actions
1. Check thermcouple continuity.
2. Replace thermocouple or return probe to Rosemount
Potential cause
Heater failure
Recommended actions
1. Check heater cold resistance.
2. Replace heater or return to Rosemount.
Potential cause
Electronics failure
Recommended actions
1. Triac O/P to heater.
2. Check electronics package.
5.2 No response to oxygen concentration change
when heater is hot and thermocouple mV
output is at setpoint ±0.2 mV
Potential cause
Recorder failure
Rosemount Oxymitter DR
It should be 67 to 77 ohm.
Troubleshoot
October 2019
™
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67