Critical Environment Technologies LPT-M, Руководство по эксплуатации

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62 © 2020 All rights reserved. Data subject to change without notice.
LPT-M - Operation Manual Rev. B | 2020.11
Step 2
Apply the correct Null gas for the type of sensor installed, for a minimum of 2 minutes.
Step 3
Attach a volt meter to TP1 and TP2. Using the POT RN1 potentiometer (located on the left underside
of the ESH-A board), adjust the voltage to read 0.40 VDC. Verify that the voltage output from digital
multi-meter leads attached to test points TP1 and TP2 on the LPT-M is reading 0.0 VDC (a Zero and
Span Calibration of the LPT-M will be required if this is not the case).
Step 4
Return the jumpers to their original positions and close the ESH-A.
Step 5
On the LPT-M, in the Sensor Confi guration Menu (passcode 3032), press either ARROW key to scroll
through the menu and select the channel the ESH-A has been assigned to.
Follow the instructions
in Section 8.2 Calibrating the Internal Sensor(s) with the exception of applying the gas to the
ESH-A sensor opening instead of the LPT-M sensor opening.
7.5 Calibrating an Oxygen Sensor
When calibrating an Oxygen sensor, the process is reversed. A Span Calibration must be done fi rst,
then a Zero Calibration. The Zero Calibration is done using a cylinder of 99.9% Nitrogen (N
2
) gas.
Step 1
In the Sensor Confi guration Menu (passcode 3032), press either ARROW key to scroll through the
menu and select the channel with the Oxygen sensor you want to calibrate. Press ENTER and use
the ARROW key to scroll to Calibrate Span.
Set the span calibration gas level. It is important to make sure that the span gas level value matches
the calibration gas concentration you are using to calibrate the sensor.