
CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION
VAISALA __________________________________________________________________________ 5
Led light indicators and optional display
The GMT220 series transmitter has as a 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.
• The red LEVEL LEDS are lit if the relay setting is reached e.g CO
2
concentration is over predefined limit. If the relays are not in use,
the
LEVEL LEDs indicating CO
2
concentration are dark.
The transmitter is also available with an optional back lit LCD
display, which outputs the CO
2
volume concentration in unit of
percentage or ppm depending on the measurement range of the probe.
Blinking led lights and Er-codes in the display indicate operation
errors (see Chapter 5, Error messages).
Figure 3. LED light indicators and optional display.
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