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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
C.1.2 HIGH TEMPERATURE
Condition detected Possible cause F Action to take
Airway temperature high alarm
activated.
Sudden spurious increase in gas flow. Wait for temperature to fall below
threshold.
Heater wire too close to temperature
probe.
Use shorter heater wire or lengthen
inspiratory hose so that distance is
between 25 (1”) and 100 mm (4”), ideally
30 mm.
Possibly faulty EOH sensor on
temperature probe (low resistance).
Check probe, see § 6.4.
Chamber temperature high alarm
activated.
No water in chamber. Refill humidification chamber.
Possibly faulty TOP sensor on
temperature probe (low resistance).
Check probe, see § 6.4.
C.1.3 TEMPERATURE FLUCTUATING
Condition detected Possible cause FAction to take
High and low temperature
alarms.
Ventilation rate too low or too erratic
for proper humidifier temperature
control.
Ventilation rates below about 6 bpm or of
a highly erratic nature may affect the
stability of the temperature control.
Humidifier temperature control
influenced by external heating or
cooling such as air conditioner.
Shield breathing circuit from external
influence.
Temperature probes incorrectly
positioned.
Check temperature probe position in the
circuit.
Possibly faulty temperature probe
(Could be intermittent short or open
circuit).
Check probe, see Section 6.4.
(Wriggle probe to pick up intermittent
faults).
C.1.4 EXCESSIVE WATER IN CIRCUIT
Condition detected Possible cause FAction to take
Excessive water in inspiratory
circuit due to rainout.
If in non-heated wire mode, water trap
not at the lowest point of the circuit.
Reposition water trap.
If in heated wire mode, heater wire too
close to temperature probe.
Increase distance from heater wire to
temperature probe so that the distance is
between 25 (1”) and 100mm (4”), ideally
30mm.
Inspiratory circuit being cooled by air
conditioner.
Shield circuit from air conditioner or use
heater wire circuits.
Chamber control set too high Reduce setting.
Maximum permissible peak flow rate of
humidification chamber has been
exceeded.
Use correct chamber. Refer to the
operating instructions for the type of
chamber used.
Humidifier chamber tilted. Ensure chamber is level.
Possibly faulty temperature probe (low
resistance).
Check probe, see § 6.4
Inspiratory heater wire not connected
in a parallel wired dual circuit.
Connect inspiratory heater wire.