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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
3.2.4 CHAMBER TEMP HIGH ALARM
This alarm will activate if:
• The temperature of gas leaving the humidification chamber outlet is more than 4 °C higher than the chamber set
temperature for more than 20 minutes. (The chamber set temperature is the sum of the Temperature Control
setting and the Chamber Control setting).
• The temperature of the gas leaving the humidification chamber outlet exceeds the chamber set temperature by
10 °C or more.
This alarm causes the heater circuits to switch off and the ‘Chamber Temp High’ amber LED indicator to start flashing.
The audio alarm (which can be muted) is also enabled. This alarm remains active until the high temperature condition is
cleared.
3.2.5 CHAMBER TEMP LOW ALARM ACTIVATION
For Chamber Set Temperature < 35 °C For Chamber Set Temperature ≥≥ 35 °C
The temperature of gas leaving the humidification
chamber outlet is less than 4 °C lower than the
chamber set temperature for more than 20 minutes.
The temperature of gas leaving the humidification
chamber outlet is less than 31 °C for more than 20
minutes.
The Chamber Temp Low alarm amber LED will begin to flash and the audio alarm is enabled. This alarm remains active
until the low temperature condition is cleared. Pushing the mute button will silence the Audio alarm.
3.2.6 SET LOW WARNING
Version 1.0 and Version 2.0 Software
This alarm will activate if the chamber set temperature is below 31.0 °C. In this case the Set Low amber LED will
immediately be enabled and remain on, until such time as the chamber set temperature is adjusted above 31.0 °C. There is
no audible alarm.
Version 3.0 Software
This alarm will activate if either the chamber set temperature or Temperature Control setting is below 34.0 °C.
In these cases the Set Low amber LED will immediately be enabled and remain on, until such time as the set airway or
chamber set temperature is adjusted above 34.0 °C. There is no audible alarm.
3.3 TEMPERATURE ALARMS IN NON HEATER WIRE MODE (INCLUDES MR480)
3.3.1 HEATER WIRE ALARM
This indicates that a heater wire has been connected when the non heater wire mode has been selected (Heater Wire
‘On’ LED is off). In this case the Heater Wire alarm LED will be flashing, the audio alarm begins and the heaterplate is
switched off.
3.3.2 AIRWAY TEMPERATURE HIGH ALARM
The red Airway Temp High LED will flash and an audible alarm will sound if the gas temperature being delivered to the
patient is 41 °C or higher. Power to the heaterplate is immediately shut off.
3.3.3 AIRWAY TEMPERATURE LOW ALARM
The red Airway Temp Low LED will flash and an audible alarm will sound if the gas temperature being delivered to the
patient is 29.5 °C or less.
The audio alarm is not enabled for 30 seconds after the low temperature LED begins flashing.