Carbon Monoxide Alarm User Manual
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6.2.5 Exiting the Datalogging Adjust mode 30
6.3 Downloading recorded data 30
6.3.1 Entering the Record Keeping Data Transfer mode 30
6.3.2 Downloading recorded data to the instrument screen 30
6.3.4 Downloading recorded data to a computer 31
6.3.5 Clearing data from PhD
2
memory after downloading to P.C. 31
6.3.6 Exiting the Record Keeping Data Transfer mode 32
Chapter 7 Trouble-shooting and repair -------------------------------------------------------------33
7.1 Changing PhD
2
sensors 33
7.1.1 Replacing toxic sensors 33
7.1.2 Replacing combustible gas sensors 33
7.1.3 Replacing oxygen sensors. 33
7.1.4 Adding, removing, or re-configuring sensors 33
7.2 Troubleshooting 33
7.2.1 Re-booting the microprocessor software 33
7.2.2 Re-initializing the PhD
2
. 33
7.2.3 Specific problems 34
7.2.3.1 Unit will not turn on 34
7.2.3.2 Problem: Unit will not turn off 34
7.2.3.3 Problem: LEL sensor readings unstable 34
7.2.3.4. Problem: Toxic sensor readings unstable or numbers flash instead of remaining steady 34
7.2.3.5 Problem: "X" appears under channel display for combustible gas 35
7.2.3.6. Problem: Unstable oxygen readings 35
7.2.3.7 Problem: Display is blank 35
7.2.3.8 Problem: No audible alarm 35
7.2.3.9 Problem: Function keypad (+,-, Cal, Alarm) doesn't work 35
7.3 Changing the PhD
2
microprocessor PROM chip 35
7.4 Replacing the internally housed (sealed lead acid) rechargeable battery 36
7.5 Returning your PhD
2
to Biosystems for service or repair 36
Appendices 37
Appendix A Toxic gas measurement - Ceilings, TWAs and STELs 37
1. Ceiling level: 37
2. Time Weighted Average (TWA): 37
3. Short Term Exposure Limits (STEL): 37
Appendix B How to determine where your alarms should be set 38
Appendix C How to calibrate your PhD
2
in contaminated air 41
Appendix D Suggested Calibration Gases 42
Appendix E PhD
2
Toxic Sensor Cross Sensitivity Data 43
Appendix F PhD
2
sensor ranges 44
Appendix G Calibration Frequency 45
Appendix H Biosystems Standard Warranty Gas Detection Products 46