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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
33
6.4.5 Diagnostic Menu for Software Version 7.22
Display Description
HC
Humidity Compensation (HC) algorithm
Note: HC is inactive while operating under non-heater wire control.
Invasive mode, compensation range is 0.0 to 5.0 °C ( CSP = 37.0 to 42 °C )
Non-Invasive mode, compensation range is 0.0 to 5.0 °C ( CSP = 31.0 to 36.0 °C )
By pressing the Mute and Mode buttons together for 1 second or pressing the Mute and Power buttons
together for 1 second the user can respectively move up or down through the settings listed below. The
humidifier will confirm the change with a double-beep.
‘5.0’ = +5.0 °C of chamber compensation
‘4.0’ = +4.0 °C of chamber compensation
‘3.0’ = +3.0 °C of chamber compensation
‘2.0’ = +2.0 °C of chamber compensation
‘1.0’ = +1.0 °C of chamber compensation
‘0.0’ = +0.0 °C of chamber compensation (NO compensation)
‘-A-‘ = Automatic humidity compensation mode: Invasive mode: 0 to 5 °C in 0.5 °C steps
Non-invasive mode: 0 to 5 °C in 1 °C steps
Cct
Connected breathing circuit identification:
“S“ = Standard inspiratory heater connected
“C” = Coaxial inspiratory heater connected
“E” = Expiratory heater connected
“---” = No heaters detected while under heater wire control
Non-Heater Wire Operation
To enable non heater wire operation, press and hold both the mute and mode buttons simultaneously for 1
second. The display will show ‘nhh’ and the humidifier will confirm with an audible beep. Ensure that no
heated breathing circuit is connected to the humidifier otherwise the humidifier won’t change operation.
To disable non-heater wire mode, repeat the above process or connect a heater breathing circuit.
CSP
Chamber set point, in 0.1 °C resolution eg: 37.0
Invasive mode range 35.5 to 42 °C.
Non-Invasive mode range 31.0 to 36.0 °C.
Cdc
Chamber Duty Cycle (%)
During selection of this menu and while a chamber probe out test is active the chamber probe indicator will
light.
CHP
Chamber Power / Flow ratio (W/LPM)
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, ( Stand-by )
“Lo” = Low flow, ( < 3 LPM )
“In” = Intermediate flow, ( 2 to 17 LPM )
“Hi” = High flow, ( > 13 LPM )
“ -“ = Ventilated flow detected
ASP
Airway temperature set point (0.1 °C)
Adc
Airway Duty Cycle (%)
During selection of this menu and while an airway probe out test is active the airway probe indicator will light.
H2O
Water out number, used to detect the presence of chamber water, calculated from, chamber power / (heater
plate temp. – chamber temp.).
During selection of this menu and while the water out number falls below a dry chamber threshold the water
out indicator will light.
LAS
Last 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 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.