CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION
VAISALA __________________________________________________________________________ 5
Led light indicators and optional display
The GMT220 series transmitter has as standard three LED light
indicators on the cover plate: operation, level 1 and level 2 (see Figure
3). The green operation LED is lit as the power is connected. If the
relays are used, the lit red LED indicates excess of corresponding relay
trigger point e.g. CO
2
concentration is over predefined limit. In
normal conditions, the LEDs indicating CO
2
concentration are dark.
The transmitter is also available with an optional back lit LCD
display, which outputs the CO
2
concentration as either percentage or
ppm depending on the measurement range of the probe.
Figure 3 LED light indicators and optional display
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