3.3 Sample Tubing
Sample tubing connects to the CL1/CL2 through the inlet on the bottom of the unit. (see Figure 3.2). Sample
tubing must be FEP 1/4 OD x 1/8 ID (150 ft max length – 6” for diisocyanates) which may be purchased from
DOD Technologies, INC (See Appendix A).
Figure 3.2
Fully depress the sample tube into fitting past the O-Ring when attaching. To detach the tube, push on the
collet and pull the tubing out.
IMPORTANT: Sample tubing used with the CL1/CL2 must be 1/4” OD x 1/8” ID FEP. Use of any other tubing
may damage the CL1/CL2 and/or cause inaccurate gas concentration readings.
3.3.1 End of Line Particulate Filters
An end of line particulate filter must be used on all gasses except Diisocyanates to prevent loss of
concentration. Filters require regular maintenance – see chapter 6.
End of line particulate filters may be purchased from DOD technologies (see appendix A)
IMPORTANT: The CL1/CL2 requires filtration to prevent dust accumulation in tubing and internal damage to
the unit. Dust that collects in the tubing or the internal system may cause sample loss and inaccurate gas
concentration readings.
3.4 Exhaust Tubing
The exhaust line must be ¼”OD x 3/16” ID tubing with a maximum length of 25ft. Polyethylene is
recommended although polypropylene or Teflon may also be used. Exhaust tubing may be purchased from
DOD technologies (see appendix A)
3.5 A/C Power
A 6ft power cord is included – DO NOT use extension cords with the CL1/CL2. Longer cords are available
from most electrical supply stores.
3.6 Output Wiring
The output relays for Alarm Level 1 and System Fault are rated at 6 amp maximum.
The 4-20ma output is adjustable within the CL1/CL2 to increase precision. When not in analysis the CL1/CL2
will output the 2ma calibrated value. There is a maximum of 500-ohm load impedance on the 4-20ma circuit.
See Appendix B for a listing of output module connections.
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