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(with finger slightly removed) to obtain a 10% sample. Keep finger on syringe until
testing. For other concentrations adjust syringe volume settings accordingly.
Users can calibrate the system by pressing the Cal icon in the lower left corner of the
test screen. The four steps of calibration are outlined below.
1. Calibration Pre-Cal Purge
2. Cal – Insert probe into sample and press Cal
3. Calibration Test
4. Calibration Post-Test Purge – Remove Probe
In step 1 the pump runs per the Cal Pre-Purge Time to ensure the test line is helium
free and ready for calibration. Next the following text is displayed, "Cal – Insert probe
into sample and press Cal". During the Cal Test Time the user insets their probe into
the known gas sample mix and software monitors the signal to find the max helium
reading.
After the Cal Test timer is complete the user removes the probe from the gas sample
mix and the pump purges any residual gas from the test line, if the new Cal factor was
within the minimum and maximum CF limit then the calibration was successful
otherwise calibration fail will be displayed.
LHCT03D & LHCT03D-R Operations and Maintenance Manual
6 OPERATING PROCEDURES
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