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MR810 Technical Manual Revision C REF 185042601
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8.3.2 TEST PROCEDURE
1. Connect the MR810 as for normal operation (refer to § 3). Make sure the airway probe port is capped.
2. Check the thermometer for air bubbles in the red alcohol, and discard if any are present. Fully insert
the supplied thermometer into the chamber temperature probe port.
3. Adjust the gas source to 10 ± 2 L/mi n.
4. Turn on the MR810 and set to the Medium setting, and check that the heater-wire indicator is on.
5. Allow the humidifier to stabilise for at least one (1) hour.
6. Check the thermometer temperature reading is within the range 29 to 35 °C. If not, leave the MR810
for another half-hour then recheck. After rechecking, the unit fails the test if still outside the
temperature range. Consult § 5 (Troubleshooting).
7. Now remove the thermometer and cap the temperature probe port. Insert the thermometer fully into the
airway probe port.
8. After five (5) minutes note the thermometer temperature. If the temperature is within the range 29 to
35 °C, the unit passes the test. If not, leave the unit for half an hour then repeat the test. The unit fails
if it is still outside the specified temperature range. Consult § 5 (Troubleshoo ting).
8.4 NON HEATER-WIRE MODE PERFORMANCE CHECK
• Perform this check if the MR810 is used with non heater-wire circuits.
• The test should be conducted in an ambient temperature of 23 ± 2 °C with no drafts.
• Allow approximately 30 minutes to complete the test.
8.4.1 EQUIPMENT REQUIRED
1. MR810 humidifier to be tested.
2. MR250 chamber filled with water. (Note: the MR290 chamber is difficult to use for th is test because of
the floats).
3. Accurate glass thermometer (do not use the 900MR033 thermometer).
8.4.2 TEST PROCEDURE
1. Set up the humidifier with the MR250 chamber, filled with water to the maximum water level. This
test does not require the use of a breathing circuit, nor is a gas flow required.
2. Ensure that the heater-wire adaptor is not connected, and that the heater-wire indicator remains off.
3. Select the medium setting and wait for 30 minutes to allow the water temperature to stab ilise.
4. After 30 minutes stir the water in the chamber to mix it thoroughly. Record the water temperature
using an accurate thermometer. Make sure the thermometer is not resting on the chamber base when
taking the reading, as this will give an inaccurate measurement.
5. The thermometer must read between 55 and 60 °C. If it does not, recheck the temperature ten (10)
minutes later (stir the water before checking). The unit fails the test if the temperature is still outside
the limits. Consult § 5 (Troubleshooting ).