© 2022 All rights reserved. Data subject to change without notice.
55
Rev. B | 2022.03
LPT-M - Operation Manual
6.12 Enable / Disable Channels
This setting allows you to enable or disable the channel(s). If a channel with a
viable sensor is disabled, the gas readings gathered by that channel will not be
used to control the relays and/or alarms.
In the Sensor Configuration Menu (passcode 3032), press either ARROW key to
scroll through the menu and select the channel you want to disable.
Press ENTER and use the ARROW key to scroll to the Enable screen. Use the
ENTER key to choose ON or OFF. Use the ARROW key to move on to the next
menu item and ENTER to Exit.
7 CALIBRATION
7.1 Calibration Specifications
7.1.1 Gas
Calibration span gases should have at least ± 5% accuracy and have a current
date stamp. Gas generators should have a current dated cell installed. Service
personnel should flow zero emissions air or 20.9% volume O
2
(scrubbed of
hydrocarbons) before attempting to null adjust toxic gas sensors. In some
cases nitrogen (N
2
) can be substituted for zero air when null adjusting
electrochemical sensors. Contact CETCI for clarification.
Every LPT-M transmitter is calibrated in a chamber by true diffusion method
prior to leaving our facility. This method more closely emulates actual “real
world” conditions. Field calibration using gas cylinder, regulator and hose
