Welch-allyn LC101 CO2 Module - User Manual Manual de usuario Pagina 48
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LC101 CO
2
Module OEM Implementation Manual
Page 48 Confidential Welch Allyn OEM Technologies
Pneumatic Events
Pneumatic events which may occur include
• total inlet occlusion
• partial inlet occlusion
• total exhaust occlusion
• partial exhaust occlusion
• barometric pressure out of range
• unexpected reverse flow
• unexpected forward flow
Total Inlet Occlusion
A total blockage in some region of the inlet tubing, or a total inlet occlusion, is typically caused by
a kinked or occluded sample line, a fully saturated watertrap or an occluded secondary shutoff
pellet. In the event that this condition occurs, the Pneumatic System ramps up the pump speed to
achieve a high clearing vacuum (HCV) for 5 seconds. If the occlusion is cleared by this action,
the pump returns to normal operation.
If the occlusion is not cleared after 5 seconds, the Module automatically reverts to a hold, or low
clearing vacuum (LCV) state, for up to 15 minutes. During this condition, the Module responds to
status requests with a <Sxx17> Watertrap or Cannula Occlusion response. If the occlusion is not
removed after 15 minutes of LCV, the Module reverts to the standby mode and a new
measurement of auto run mode command must be issued to start CO
2
waveform and breath data
packet transmission.
NOTE Inducing a total inlet occlusion can be useful to check for internal pneumatic leaks.
When the Module goes into the LCV state, typical pump operation remains relatively
stable in holding the vacuum.
NOTE However, if there are leaks within the overall system, the pump ramps up and cycles
often to maintain LCV. The Module may possibly toggle between the normal and inlet
occluded state depending on the magnitude of the leak. A specific connection may also
be tested by blocking specific locations in the pneumatics.
Partial Inlet Occlusion
A partial blockage of the inlet tubing, or partial inlet occlusion, is typically caused by a partially
occluded sample line. In the event that this condition occurs, the Pneumatic System ramps up
the pump speed sufficiently to sustain the set flow rate. The Module responds to status requests
with a <Sxx00> Status OK response.
- LC101 CO 1
- Functional Description 7
- Terminology 8
- Measuring Principle 8
- Measurement Calculation 9
- Measurement Compensation 10
- Hardware Components 11
- Sidestream Components 13
- LC101 Module Interface 15
- Watertrap Switch Connection 16
- Watertrap Receiver 16
- Watertrap Receiver Switch 17
- Exhaust Tubing 17
- LC101 Calibration 19
- Zero Calibration Procedure 20
- Section 3 - LC101 Calibration 21
- Troubleshooting 24
- Host/Module Communications 25
- Packet Structure 26
- Host Commands 27
- Simple Commands 28
- Configuration Commands 29
- C-Cap EEPROM Memory Map 32
- Status Responses 34
- Mode Command Responses 35
- Simple Command Responses 36
- Example: 38
- Calibration Command Responses 40
- Software Protocol 41
- Status Message Code Table 44
- Code (hex) Suggested Message 44
- Fault OFF OFF NO 46
- Standby OFF OFF NO 46
- Measurement ON ON YES 46
- Autorun ON ON YES 46
- Pneumatic Operation 47
- Pneumatic Events 48
- Total Exhaust Occlusion 49
- Partial Exhaust Occlusion 49
- Barometric Out Of Range 49
- Unexpected Reverse Flow 49
- Internal Disconnects 50
- Pump Failure 51
- Regulatory 53
- Electromagnetic Interference 54
- Compliance Testing Summary 54
- ISO 9918 and EN 864 54
- Software Procedures 55
- Percent CO 56
- Calculation 56
- Seq Host Module Description 58
- CCITT/CRC Code Calculation 60
- Software Upgrade 61
- EEPROM Memory Map 63
- Error Messages & Recovery 65
- Advisories 66
- Too Large 67
- Calibration Advisories 68
- Soft Faults 69
- Sensor Faults 70
- System Faults 72
- Welch Allyn OEM Technologies 75
- Part Numbers and Accessories 75
- Technologies 76
- Specifications 77
- Appendix E - Specifications 79
- (Ref. 000.10100.UOO Rev. 0) 79
- Developer’s Kit 83
- Software Installation 84
- Initial Setup 84
- Appendix F - CO 85
- Menu Options Description 86
- 50 mmHg 6% 88
- 75 mmHg 10% 88
- 100 mmHg 14% 88
- Glossary 91
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