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© 2022 All rights reserved. Data subject to change without notice.
LPT-M - Operation Manual
Rev. B | 2022.03
Default setpoints are as follows:
SENSOR GAS TYPE
LOW ALARM
MID
ALARM
HIGH
ALARM
Carbon Monoxide (CO)
25 ppm
50 ppm
100 ppm
Nitrogen Dioxide (NO
2
)
0.7 ppm
1.0 ppm
1.5 ppm
Combustibles (catalytic)
10% LEL
15% LEL
20% LEL
6.11.4 Setting Hysteresis
Hysteresis is the difference between the ON point and OFF point of the alarm.
You can set a hysteresis value that will be common for all alarm setpoints on
that channel. For example, if the alarm is set to come on at 100 ppm and the
hysteresis is set for 5 ppm, the alarm will not turn off until the gas is below 95
ppm. This prevents the alarm from chattering on and off repetitively if the gas
fluctuates just above and just below 100 ppm.
In the Sensor Configuration Menu (passcode 3032), press either ARROW key
to scroll through the menu and select the channel for which you are setting the
hysteresis value. Scroll through the menu options to SP Diff and press ENTER
to select.
Use the ARROW keys to increase or decrease the number. Press ENTER to
move to the next digit and again to save and Exit the screen.
