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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
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8 Performance Testing
This section discusses the performance testing of the MR850 humidifier and also the MR850
temperature / flow probe. Performance testing is required as part of ongoing maintenance or
after servicing of the humidifier has been completed.
8.1 Humidifier Performance Testing
If the humidifier has been operating normally, but a performance check is required as part of the
maintenance schedule, it is recommended that the following tests are completed:
1. A humidifier Calibration Check (Section 8.1.2)
2. A humidifier Display Check (Section 8.1.3)
However, if there is a problem with the humidifier, or if the humidifier has recently been
serviced, then the following tests should be completed in addition to those outlined above.
3. A humidifier Voltage Calibration Check (only required if the MR850's PCBs or mains
transformer have been serviced or replaced). (Section 8.1.4)
4. A humidifier Warm-up and Control Check. (Section 8.1.5)
8.1.1 Entering the Service Menu
The MR850 humidifier has a special mode which enables the operator to verify correct
operation. To enter this mode, hold down the power button on the front of the humidifier then
apply mains power. The See-Manual indicator will light, and the humidifier will enter the service
menu. The service menu has six different tests:
Display Description Reference
-1- Calibration Probe #1 Check Section 8.1.2
-2- Calibration Probe #2 Check Section 8.1.2
-3- Voltage Calibration Check Section 8.1.4
-4- Temperature Probe Check Section 8.2.1
-5- Flow Check Section 8.2.2
-6- Display Test Section 8.1.3
End Service Menu Exit
Pushing the mute button while a number is displayed enters the relevant service test. When
'End' is displayed the user can press the mute button to cycle back to the start of the service
menu. If no button is pushed, the service menu will automatically exit after six seconds.
NOTE: All tests performed in the service menu will automatically exit after 30 minutes.
8.1.2 Humidifier Calibration Check
This section describes how to check the accuracy of the humidifier's temperature and flow
measurement electronics.
Equipment Required:
• MR850 Humidifier
• Reference Probe Set, Fisher & Paykel Healthcare part number: 900MR870