© 2021 All rights reserved. Data subject to change without notice.
37
Rev. E | 2021.03
LPT - Operation Manual
To achieve calibration, the user must go through the following steps:
Step 1
:
Indic
ate what concentration of span gas used to fl ow over the sensor by putting Jumper-1 into gas
position (GAS1, GAS2 or GAS3).
GAS
SENSOR
SENSOR
RANGE
JUMPER-1
SETTING
SPAN GAS
CONCENTRATION LEVEL
VOLTAGE
READING
O
2
0 - 25% vol
GAS3
23.0% vol
3.68 VDC
GAS2
20.9% vol
3.34 VDC
GAS1
19.0% vol
3.04 VDC
The gas level for each jumper position can also be determined by placing Jumper-1 into one of
the GAS positions and Jumper-2 into the OVER position. This will cause the LPT to output the
corresponding signal on both the current loop and the voltage test points.
If the service person is confi dent of the air quality and is careful (do not exhale in the direction of
the Oxygen sensor vent on the LPT being serviced while span adjusting), Oxygen (ambient air) in
the breathing environment can be used as a fairly accurate source of span gas for jumper position
GAS2. However, a cylinder of Oxygen 20.9% volume is suggested.
Step 2
:
Attach the regulator to a cylinder of span gas. (If ambient conditions are being used, skip to Step 5.)
Step 3
:
Insert the calibration adapter plug into the sensor opening in the front of the enclosure door. Use
