Welch Allyn Duet CO2 Module - User Manual - Manual (Page 76)

Duet CO
2
Module OEM Implementation Manual
Page 76 Confidential Welch Allyn OEM Technologies
Status
Message Code
(hex) Definition Possible Causes
14 signal very low • obstructed airway adapter
• airway adapter windows not clean
• CO
2
sensor windows not clean
• faulty airway adapter/CO
2
sensor
15 barometric pressure offset too
large • faulty barometric transducer
19 dark phase signal noisy • electrical interference
faulty sensor
1A open phase signal saturated • faulty sensor
27 calculation error • CO
2
or breath measurement calculation
error
10h, Warm Up in Progress (mainstream only)
Status is requested during the primary stage of mainstream sensor warm up. It is not an
indication of failure but an indication that the mainstream sensor is working to achieve
operating temperature. During the preliminary warm up phase, the mainstream sensor
reaches the “near final” temperature and progresses to the start up phase of operation. Once
start up conditions are met, the mainstream sensor returns to complete the warm up phase.
This code is sent only during the preliminary warm up phase.
11h, CO
2
Sensor Start up in Progress
Status is requested during the mainstream or sidestream CO
2
sensor chopper motor start. It is
not an indication of failure but an indication that the chopper motor is in the start up phase.
Once operating speed is reached and the sync signal is captured, the mainstream or
sidestream CO
2
sensor automatically progresses to the next phase of operation.
13h, Signal Low
IR detector voltage measured during the reference gas cell phase of the chopper wheel
rotation is less than the lower signal limit. CO
2
waveform and breath data packets are available
despite the advisory. Host may want to disregard this level and only report the next level, or
advisory (refer to 14h).
Action (mainstream)
• Clear airway adapter of obstructions by removing the airway adapter from the
ventilator circuit. Rinse with water and air dry.
• Clean CO
2
sensor housing windows.
• Make sure the CO
2
sensor is completely seated on the airway adapter and that the
sensor is in the upright position on the circuit.
• Replace the airway adapter.
• If available, replace the CO
2
sensor.
Action (sidestream)
Verify system not exposed to excessive contamination.