Welch Allyn Duet CO2 Module - User Manual - Manual (Page 79)

Duet CO
2
Module OEM Implementation Manual
Welch Allyn OEM Technologies Confidential Page 79
Sensor Faults
CO
2
sensor faults are conditions that result in shutting down the sensor. A CO
2
sensor shutdown stops
the chopper motor and turns off the lamp, the heater in mainstream operation and the pump in
sidestream operation
To clear a sensor fault Implement one of the following.
• A mainstream sensor disconnect and reconnect if mainstream operation.
• A software reset followed by a new host command. If the module does not accept the command, a
hard reset is required.
• A hard reset by holding the receive data line in a break condition for 10 msec to 500 msec. A hard
reset forces the microprocessor to enter the boot mode once the condition is released. On power
up, the microprocessor is held in reset for about 100 msec after the supply voltage rises above 4.5
V.
Sensor faults are listed in the following table.
Status
Message Code Definition Possible Causes
14 CO
2
sensor signal very low • obstructed airway adapter
• airway adapter windows not clean
• CO
2
sensor windows not clean
• faulty airway adapter/CO
2
sensor
50 CO
2
sensor disconnect • loose sensor connector
• faulty sensor
• faulty Nicolay receptacle/flex circuit
51 CO
2
sensor manufacturer ID
mismatch
• another company’s sensor
• faulty sensor EEPROM
60 CO
2
sensor EEPROM error in
revision #
• incompatible/invalid sensor EEPROM
revision #
• faulty sensor EEPROM
61 CO
2
sensor EEPROM error in
checksum
• invalid sensor EEPROM checksum
• faulty sensor EEPROM
65 CO
2
Sensor EEPROM error in
read or write operation
• invalid read/write to sensor EEPROM
• faulty sensor EEPROM
66 CO
2
sensor EEPROM error in
CRC code
• invalid sensor EEPROM CRC code
• faulty sensor EEPROM
70 CO
2
sensor temperature too
high
• sensor exposure to excessive heat source
• faulty sensor
71 CO
2
sensor temperature too
low
• sensor exposure to excessive cold source
• faulty sensor
72 CO
2
sensor warm up error • faulty sensor
73 CO
2
sensor heater output error • faulty sensor
78 CO
2
sensor motor speed out of
range
• faulty sensor or sensor cable
79 CO
2
sensor motor start error • faulty sensor or sensor cable
7B CO
2
sensor signal unable to
synchronize
• faulty sensor or sensor cable
7E CO
2
sensor IR source error • faulty sensor