User's Guide _______________________________________________________________________
12 ___________________________________________________________________ M211659EN-C
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the GMW90 series transmitters.
Introduction to GMW90 Series
GMW90 series transmitters are wall-mount transmitters for building
automation applications. All GMW90 series transmitters measure carbon
dioxide (CO
2
) and temperature (T), and some models also include
humidity measurement. The CO
2
measurement is based on a new
generation CARBOCAP
®
sensor, which uses a novel, silicon-based
microchip emitter instead of an incandescent light bulb.
All transmitter models in the series share the following common features:
- Detachable mounting base for easy installation and wiring.
- Display (visible or hidden behind the cover).
- Sliding cover for accessing maintenance functions.
- Adjustment trimmers.
- DIP switches for most common configuration tasks.
- RS-485 line for temporary service use with hand-held MI70 indicator
or PC.
1310-036
Figure 1 GMW90 with Visible Display and Indicator LEDs
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