Fisher & Paykel MR730 User Manual

57

Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001

3 

Connect the Heater Wire cable to the humidifier.

4 

If a gas supply is used, set to 5- 10 l/minute, if no gas supply used, the breathing tube should be supported
from the patient end so that it drops vertically over its entire length to the top of the chamber.

1

Turn the humidifier on, ensure the heater wire LED is on for a MR720 or MR730.

2

Adjust set temperature to 36.0 ± 0.1 °C and Chamber Control to 0.

3

NOTE: At low ambient temperatures (below 22 °C) a low temperature alarm may occur, if this occurs, press mute
and restart the test , the breathing circuit will eventually warm up and the humidifier will start controlling.

4

Check after 30 minutes:

Digital display is 36.0 ± 0.3 °C
Chamber outlet temperature is 36.0 ± 2.0 °C

If the unit is alarming or has not reached 36 ± 0.3 °C, press the mute button if necessary and leave for a further
15 minutes.

5

Then check the following in ‘Engineering Mode’ (see appendix A2):

set

36 ± 0.1 °C

offset

0

Edc

≥

 0

Cdc

≥

 0

hp

≥

 36 °C

5 

If unit passes this test it is controlling correctly and can be put back in use.

6 

Set up a non heated breathing circuit, see typical setup below:

Setup Notes:

♦

Patient delivery tubing can be single use or reusable.

♦

A gas supply of 2 – 10 l/minute to the chamber is recommended, if no gas supply is used, then the breathing circuit
must be 22mm diameter to ensure adequate airflow.

♦

Use a dual airway temperature sensor, such as 900MR560.

♦

  Use a Fisher and Paykel  humidification chamber, such as a MR200 series, filled with cold water to maximum level (not

a MR290).