Welch Allyn LC101 CO2 Module - User Manual - Manual (Page 50)

LC101 CO
2
Module OEM Implementation Manual
Page 50 Confidential Welch Allyn OEM Technologies
Unexpected Forward Flow
This condition occurs when the pneumatic input is connected to a positive pressure source, or
flow source. The flow control circuitry checks the Pneumatic System for this condition prior to
turning ON the pump. If a positive pressure exists on the exhaust prior to the pump starting, the
Module reverts to the fault mode. During this condition, the pump is not operational and the
Module responds to status requests with Unexpected Forward Flow.
Internal Disconnects
Internal disconnects which may occur include
• watertrap receptacle
• sensor inlet/outlet
• flow control circuitry
• pump inlet
• pump exhaust
Watertrap Receptacle
If a pneumatic connection at the watertrap receptacle is loose or has failed, the transmission of
CO
2
waveform and breath data packets is halted. The Module does not report this fault to the
host but clears the breath data based on the default specified in the No Breath Timeout
command.
Sensor Inlet/Outlet
If a pneumatic connection at the sensor inlet or outlet is loose or has failed, the transmission of
CO
2
waveform and breath data packets is halted. The Module does not report this fault to the
host but clears the breath data based on the default specified in the No Breath Timeout
command.
Flow Control Circuitry
If a pneumatic connection in the flow control circuitry is loose or has failed, transmission of CO
2
waveform and breath data packets is halted. Pump operation may be unstable due to the lack of
flow control feedback. The Module reverts to fault mode and may respond to status requests by
issuing a number of different fault codes.
Pump Inlet
If the pneumatic connection at the pump inlet is loose or has failed, transmission of CO
2
waveform and breath data packets is halted. The set flow rate cannot be achieved since the
pump is disconnected. The Module reverts to the fault mode and responds to status requests
with an Exhaust Occlusion response.