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.

8.1Humidifier 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)

8.1.1Entering 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.

8.1.2Humidifier 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

44 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)