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© 2021 All rights reserved. Data subject to change without notice.
LPT - Operation Manual
Rev. E | 2021.03
It is also suggested that when calibrating a Chlorine sensor, you use a chlorine gas generator due
to the instability of Chlorine gas in a cylinder and the fact that it is diffi cult to get accurate readings
from that source.
8.2 Calibrating the Internal Sensor
NOTE:
If you are calibrating an Oxygen sensor, refer to Section
8.3 Calibrating an Oxygen Sensor.
The calibration procedure within the LPT is jumper automated (there are no potentiometers to
adjust). Monitoring the calibration with a volt meter is optional, but suggested. The range of
0 - 4.0 VDC is equal to the full measurement range of the sensor. e.g. CO sensor has a standard
measurement range of 0 - 200 ppm. Therefore, 4.0 VDC = 200 ppm.
NOTE:
If an inappropriate concentration of span gas is applied during calibration, calibration may
succeed but it does not mean the equipment has been calibrated properly. CETCI is not responsible
for improperly calibrated transmitters. Follow the manual instructions carefully.
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
CO
0 - 200 ppm
GAS3
200 ppm
4.00 VDC
GAS2
100 ppm
2.00 VDC
GAS1
50 ppm
1.00 VDC
