Note: Increasing the signal average value in software (see Settings Window; Options; Filter in
Section 3) can help reduce fluctuations in readings.
Alarm LEDs can be viewed on the top panel of the LI-840A. Terminals 3 and 5 on the terminal
strip are also connected to the High and Low alarms, respectively. This is useful for connecting
an audible alarm, for example, or a relay switch to operate another device that will raise or lower
the CO
2
concentration to the desired level. The schematic diagram below shows how the high
alarm could be connected to a relay switch that triggers an exhaust fan in a greenhouse envir-
onment. These relays could also be used to trigger devices such as automatic dialers, alarms,
pumps, and valves in industrial and other environments.
2-5Section 2. Power On
Section 2
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