DOD CLPX - 1.4 Electrical; 1.5 Theory of Operation

C L P X
U S E R S G U I D E
D O D T E C H N O L O G I E S , I
N C
Rev 12.109 Page 3
1.4 Electrical
The unit is powered with a 6Volt rechargeable Lead Acid Battery. Use only the included charger to charge
the unit.
1.5 Theory of operation
During the analysis cycle the pump draws a measured sample of air through a chemically
impregnated “ChemLogic” paper tape. The ChemLogic tape reacts to the presence of the specific
contaminants by darkening from its original paper color. Light is bounced off the dark stain and
sensitive optics repeatedly measure the degree of change from the original color. The CLPX uses an
advanced optical detection system to measure the light level reflected from the ChemLogic tape. The
instrument calculates the change as the level of gas present in the sample. Extremely small
concentrations can be detected with this method. The instrument stores the gas level readings on the
MicroSD card for transfer to a computer for further analysis in standard comma separated values
(CSV) format.
If the calculated value indicates that the concentration has exceeded either the Low or High
ALARM set points, the instrument will sound an ALARM and flash the concentration level in the
backlit display. The CLPX automatically calculates the Short Term Exposure Limit (STEL) for the
selected gas and stores the readings in the internal data storage memory and to a MicroSD flash
memory card (if installed).
The ChemLogic paper tape is contained within a removable tape cassette. The CLPX monitor
automatically advances the roll to position a fresh segment of tape for gas sampling. Each cassette
is sealed into a protective package, and marked with expiration date and serial number. Cassette life
will vary depending the operational conditions and concentration levels of the gas being monitored.