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DC-ITD-CL4andCL8MAN01.A
www.dodtec.com
NOV 2018
815-788-5200
CL4 & CL8 Manual
1.4 Electrical Connections
“Knockout panels” for external electrical connections are provided on the top or right side of the
CL4/CL8.
The covers are exchangeable to provide top or right-side flexibility.
1.5 Theory of operation
The system draws sample flow simultaneously from all four/eight points. Part of the sample flow is diverted
across the ChemLogic Tape. The ChemLogic 4/8 uses an advanced optical detection system to measure the
light level reflected from the ChemLogic tape. As the target gas is detected, the color of the of the ChemLogic
tape changes. This color change results in a loss of reflected light across the ChemLogic tape. This loss of
reflected light is detected by the advanced optics system in the ChemLogic 4/8. The ChemLogic 4/8 will then
report an appropriate gas concentration reading and/or a gas alarm.
1.6 Time Weighted Average (TWA)
During analysis the CL4/CL8 stores the TWA information every 8 hour
s* (referred to as a ‘cycle’). The
system retains the 5 most recent cycles in memory and will save all cycles to the CUSB Memory Stick
–
if
installed. The number of cycles capable of being stored on the USB Memory Stick is only limited by the size
of the USB Memory Stick.
*NOTE:
If analysis is stopped by the operator or due to any other factor (critical
service fault, power interruption, etc.), the TWA information is saved as a
separate cycle regardless of how much time has elapsed since the cycle started.
