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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
19
4.4.5 Water Out Indicator
This indicates that there is insufficient water in the humidification chamber.
The humidifier measures the amount of power used to obtain the chamber
temperature. If a lower than expected amount of power is used, a 'water out'
alarm is generated. It may take 15 minutes or longer to generate an alarm
especially if there is a disturbance (change in flow).
This alarm can be cancelled by pressing the mute button. If however the water
out condition remains, the humidifier will alarm again.
4.5 Operational Alarms
These alarms are generated if problems occur with the operation of the humidifier.
4.5.1 Temperature Indicator
This alarm will occur if the displayed temperature is too high, or if the delivered
temperature (Invasive mode only) has been low for a period of time.
High temperature:
The humidifier will immediately alarm if at any time the displayed temperature
exceeds 41 °C, or if the airway temperature exceeds 43 °C. If either of these
high temperature alarms occur, the humidifier will immediately shut down the
heater wire and heater plate.
Low Temperature:
The low temperature warning (visual only) and alarm (visual and audible) are
active only when the humidifier is in Invasive mode. Both are disabled during
warm-up conditions. The warning alerts the user that low temperature is being
delivered to the patient. The alarm alerts the user that a low level has been
delivered to an Invasive patient for too long.
The low temperature warning and alarm operate by monitoring the displayed
temperature. If the displayed temperature is below 35.5 °C for 25 seconds, the
temperature indicator will light, and act as a warning to the user. If the
temperature remains below this level for too long, then a Temperature Alarm is
activated. The time taken for the humidifier to alarm is dependent on how far
below the 35.5 °C threshold the displayed temperature is. Figure 4.3 shows the
relationship between temperature, a temperature warning and the time before a
temperature alarm: