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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
29
6.4 Diagnostic Menu
By pressing the mute and mode buttons together for 1 second, the diagnostic menu is entered,
indicated by the display of two rows of dashes ‘= = =’. Releasing both buttons will allow the
diagnostic menu to cycle automatically through the menu, pausing at each function. Pressing
the mute button at this time will display the value behind each function for as long as the mute
button is held.
6.4.1 Diagnostic Menu for Software Versions 5.45 & 5.70
Display Description
TC Temperature Compensation (TC) algorithm
‘---‘ = 0.0
°C of chamber compensation. ( CSP = 37.0 °C)
‘Lo ’ = 1.5 °C of chamber compensation. ( CSP = 38.5 °C )
‘Hi ’ = 3.0 °C of chamber compensation. ( CSP = 40.0 °C )
To change the TC value the press the Mute and Mode buttons together for 1
second. The humidifier will confirm the change with a double-beep.
CSP Chamber set point, in 0.1 °C resolution e.g.: 37.0
Cdc
Chamber Duty Cycle (
%)
HP Heater Plate Temperature (1 °C)
Flo Gas Flow Rate (0.1 LPM)
“---“ = Unknown Flow (flow measurement not started)
FLr Gas Flow Rate Range:
“---“ = Unknown Flow (flow measurement not started)
“no” = No flow
“Lo” = Low flow, ( < 3 LPM )
“In” = Intermediate flow, ( 2 to 17 LPM )
“Hi” = High flow, ( > 14 LPM )
“ -“ = Ventilated flow detected
OFF
Offset temperature difference between the chamber and airway set temperatures
(0.1
°C)
ASP
Airway temperature set point (0.1
°C)
Adc Airway Duty Cycle (%)
LAS
Last Humidifier Alarm State, the display will blank, and the humidifier’s last alarm
will be shown on the indicators. To clear LAS, press and hold the mute and mode
buttons for 1 second. The humidifier will beep when LAS has been cleared.
LFS
Last Humidifiers Fault State, refer to section 6.3. To clear LFS, press and hold the
mute and mode buttons for 1 second. The humidifier will beep when LFS has been
cleared.
SoF Software version
End
Press the mute button to cycle to the start of the menu, or the diagnostic menu will
automatically exit after 6 seconds