Vaisala CARBOCAP GMW80 Series User Manual page 10

GMW80 Series User Guide M211748EN-G
The CO measurement is based on the Vaisala proprietary CARBOCAPâ sensor, which uses a
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novel, silicon-based microchip emitter instead of an incandescent light bulb. The internal
reference in the CO sensor guarantees the best stability and operation also in constantly
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occupied buildings without frequent readjustments.
CARBOCAPâ sensors give correct CO measurements immediately when powered on. As they
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have a built-in reference measurement, they do not need a lengthy learning phase before the
measured values are correct. Proper operation can be verified immediately after snapping on
the device cover.
All GMW80 series transmitters measure carbon dioxide (CO ) and temperature (T) with the
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exception of GMW87 and GMW88, which measure only CO . Certain models also include
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relative humidity (RH) measurement. Humidity measurement utilizes the Vaisala INTERCAPâ
sensor.
For measurements in more demanding conditions (for example, dusty or humid installation
locations), the GMW87 and GMW88 models provide an IP64-rated enclosure with a cable
gland. The GMW87 model can be accessed with the Modbus RTU protocol over an RS-485
interface. The communication settings for the protocol are entered with DIP switches on the
GMW87 component board.
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