Filter
Top Products
MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
13
4.1.2 Non-Heater Wire Operation (Software version 7.23 only)
Figure 4.2 Typical Non-Heater Wire Humidifier Setup
In this application the MR850 maintains the airway temperature at the desired set point
(invasive 37 °C or non-invasive 31 °C) by heating the chamber of water through the heater
plate. As the gas cools considerably down the unheated circuit, a water trap circuit must be
used to collect the resulting condensate.
Activating Non-Heater Wire Operation
Refer also to the diagnostic menu in section 6.4.
1 Turn on the humidifier with NO heated circuit connected, and mute the heater wire alarm.
2 Access the diagnostic menu by pressing the mute and mode buttons together for 1 second,
the display should show two rows of dashes ‘= = =’. Releasing both buttons will allow the
diagnostic menu to cycle automatically.
3 Allow the menu to cycle through to “cct” – the circuit identification. Press mute to access
this function.
4 To enable non-heated operation, press both mute and mode buttons simultaneously for 1
second, the humidifier will beep twice and the temperature display will show “nhh”.
Release both buttons. The humidifier is now configured for non-heated circuits. This
setting will be remembered each time the humidifier is turned on.
Deactivating Non-Heater Wire Operation
The simplest way to de-activate non heater wire operation is to connect a heated breathing
circuit. Alternatively it can be de-activated the same way that non-heated circuit operation was
activated (see above).
4.1.3 Stand-by Operation
If the humidifier detects a problem with its setup or operation it will alarm. Depending on the
severity of the alarm condition, the humidifier will either remove all power from the heating
systems, or enter stand-by. The humidifier will also enter stand-by if the gas flow through the
breathing circuit has stopped.
Temperature Probe
RT134 Breathing Circuit
Ventilator/Gas Supply
MR850 Humidifier
MR290
Chamber
Chamber
Probe
Airway Probe
Water trap