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© 2021 All rights reserved. Data subject to change without notice.
LPT - Operation Manual
Rev. E | 2021.03
Step 2
:
Attach regulator to cylinder of zero air, insert calibration adapter into the sensor opening in the
front of the enclosure door, and open regulator valve fully allowing zero air to fl ow over sensor for
one minute.
Use a slight twisting motion as you gently push the calibration adapter into the sensor opening. If
the calibration adapter is hard to insert, moisten the O-ring seal slightly then try re-inserting it.
If the optional splash guard is installed, slide the Cal Clip around the splash guard and attach the
tubing to the nozzle on the Cal Clip.
Step 3
:
Move the Jumper-2 on J2 to position “CAL”.
Step 4
:
If this level (possible residual gas) is too high, the internal LED will fl ash with a short OFF time
and long ON time. This indicates that an override is needed. To override, move the Jumper-1 to
the OVER position. If Jumper-1 is not moved to the OVER position in 30 seconds, the zeroing will
be cancelled and will return to normal mode. After using the OVER position, Jumper-1 should be
returned to the gas selection position (GAS1, GAS2 or GAS3).
Step 5
:
Once zeroed, the internal LED will fi rst fl ash 8 times, and then repeatedly fl ash 4 times and then
pause with the LED off . This indicates that it is time to fl ow the gas.
If the digital multi-meter leads are attached to test points TP-1 and TP-2, the voltage should be 0.0
VDC.
