4
3.1.1.1 Effects of contaminants on toxic gas sensors
16
3.1.1.2 Biosystems “CO Plus” dual purpose carbon monoxide / hydrogen sulfide sensor 17
3.1.1.2.1 Relative response of the “CO Plus” sensor to CO and H
2
S gases
17
3.2
Fresh air "zero" calibration............................................................. 18
3.3
Functional (bump) test................................................................... 18
3.4
Auto-calibration.............................................................................. 18
3.4.1 Fresh air "zero" auto-calibration sequence....................................................... 19
3.4.1.1 Reading “Too High” or “Too Low” for zero adjust
19
3.4.2 “Span” auto-calibration sequence..................................................................... 20
3.5
Manual calibration procedure ........................................................ 20
3.5.1 “Forced” fresh air "zero" through keypad buttons ............................................. 20
Chapter 4
Advanced Functions
23
4.1
Setting alarm levels ....................................................................... 23
4.1.1 Alarm adjustment sequence.............................................................................. 23
4.1.2 “Alarm Latch” command .................................................................................... 24
4.1.3 Restoring the factory default alarm settings...................................................... 24
4.2
Re-setting the calibration gas concentration ................................. 25
4.3
Setting the security beep interval................................................... 26
Chapter 5
Trouble Shooting and Repair
27
5.1
Replacing Toxi Plus sensor ........................................................... 27
5.2
Troubleshooting............................................................................. 27
5.2.1 Unit will not turn on ........................................................................................... 27
5.2.2 Unit will not turn off ........................................................................................... 27
5.2.3 Sensor readings unstable ................................................................................. 27
5.2.4 Display is blank................................................................................................. 27
5.2.5 No audible alarm............................................................................................... 28
5.2.6 Keypad buttons don't work................................................................................ 28
5.2.7 Can’t make a “One Button” auto zero adjustment (“Too High” or “Too Low” for zero
adjust) 28
5.4
Returning your Toxi Plus to Biosystems for service or repair........ 28
Appendices
29
Appendix A
Toxic gas measurement - Ceilings, TWAs and STELs........ 29
Appendix B
How to determine where your alarms should be set ............ 31
Appendix C
How to calibrate your Toxi Plus in contaminated air ............ 32
Appendix D
Suggested Calibration Gases .............................................. 32
Appendix E
Cross Sensitivity Data .......................................................... 33
Appendix F
Toxi Plus sensor ranges....................................................... 33
Appendix G: Biosystems Standard Warranty Gas Detection Products ........ 34
