XZR200 User’s Manual
14
97337 Issue 4, July 2018
GOOD MEASUREMENT PRACTICE
5
GOOD MEASUREMENT PRACTICE
There are no user-serviceable parts in the XZR200. In the event of a repair or warranty
case, please return the unit, suitably packaged with a decontamination certi
fi
cate, to
Michell's Service Department.
5.1 Error
Conditions
If the oxygen sensor is damaged, the XZR200 will highlight this by blinking the CYCLE
output (pin 4) and green LED in 3 short blinks, 1 long blink pattern or continuously OFF.
An error code is also displayed on the RS232 output and the analog outputs will go to
4mA and 0 V.
5.2
Sensor Operating Tips
To get the best performance from the XZR200 analyzer it is important that the oxygen
probe is installed and maintained in the correct manner. The following are useful sensor
operating tips and list of gases & materials that must be avoided to ensure a long sensor
life.
5.2.1 Operating the Sensor in Aggressive Humid Environments
When operating the sensor in warm, humid environments it is important the sensor
remains at a higher temperature than its surroundings, especially if there are corrosive
components in the measurement gas. During operation this is not a problem due to the
700°C (1292°F) generated by the heater. However, when the sensor or application is
being powered down, the sensor heater must be the last thing to be turned off after the
temperature of the surroundings have suitably cooled. Ideally the sensor should be left
powered at all times in very humid environments.
Failure to adhere to the above will result in condensation forming on the heater and
sensing cell (as these will be the
fi
rst components to cool due to their connections to the
outside world). When the sensor is re-powered the condensation will evaporate, leaving
behind corrosive salts which very quickly destroy the heater and cell as illustrated
below. Note how the sensor’s external metalwork looks completely normal.
Figure 7
Sensor Damage
Summary of Contents for XZR200
Page 1: ...XZR200 Oxygen Analyzer User s Manual 97337 Issue 4 July 2018 ...
Page 24: ...XZR200 User s Manual Michell Instruments 17 CALIBRATION Appendix A Technical Specifications ...
Page 27: ...XZR200 User s Manual 20 97337 Issue 4 July 2018 APPENDIX B Appendix B Theory of Operation ...
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Page 36: ...http www michell com ...