Appendix I – Additional Options
WARNING – These options should be changed only under direction from trained DOD service personnel.
Contact DOD for more information.
I.1 Pressure Check Disable Mode
(Default: OFF)
Useful for extreme conditions where the pressure at the sample point varies often. When enabled this option
will change the operation of the flow system in the CL1/CL2 as follows:
• Positive pressure into the system is ignored.
• Slight negative pressure will not cause flow fluctuation warnings.
• Flow fluctuation at the inlet is allowed if the negative pressure does not exceed the capability of the
pump to draw a valid sample pressure.
• ‘PRES’ is displayed on the screen during analysis when enabled. Note - ‘PRES’ displays only when an
SD card is inserted, the optics are clean, and the concentration is below full scale.
The flow into the system should be manually verified periodically when this mode is enabled
WARNING – Use caution when Pressure check disable mode is enabled as positive pressure may introduce
toxic gas into the system when the gate opens. In addition, displayed gas concentrations may not be
accurate when the flow level is not within normal limits of the CL1/CL2.
I.2 Optics Auto Calibration
(Default: ON)
When enabled the CL1/CL2 automatically adjusts the optics as needed during each tape advance and
displays a warning when the optics are dirty.
Disabling this option may cause HIGH BACKGROUND errors and require manual adjustment of the optics.
I.3 Maintenance Relay
(Option 2-600-211)
When option 2-600-211 is included the CL1/CL2 contains an extra relay which will trigger during three
maintenance fault conditions:
1. Tape Days Low Fault – Less than 3 days of ChemLogic tape remaining.
2. Optic Dirty Fault – The optics system needs to be cleaned.
3. SD Card Fault – The system cannot write to the SD storage card.
With this option there are 3 extra terminal blocks included inside the CL1/CL2 which are labeled “Q”,”R”, and
“S” as shown in figure I.3.1 below.
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