vaisala GMW20 User Guide
User’s Guide
www.vaisala.com
Vaisala CARBOCAP® Carbon Dioxide
Transmitter Series
GMW20
M210196EN-B
User’s Guide _____________________________________________________ GMW20
User’s Guide _____________________________________________________ GMW20
Table of Contents
Basics of the GMW20 Series ................................................ 2
Mounting...................................................................................... 2
Electrical Connections............................................................4
Power Supply Requirements................................................ 5
Technical Data ........................................................................... 7
Relays and Other Accessories............................................. 8
Dimensions (in Millimeters)................................................... 9
1
User’s Guide _____________________________________________________ GMW20
Basics of the GMW20 Series
Vaisala’s GMW20 series transmitters use silicon based
CARBOCAP
properties. The series consist of the following transmitter types:
GMW21 and display version GMW21D (80x108.5x35) mm
GMW22 and display version GMW22D (80x80x35) mm
sensor with excellent stability and reliability
The GMW20 series transmitter is calibrated as shipped from the
factory. In benign environments the recommended calibration
interval is five years. In case adjustment is needed, contact
Vaisala Service or local Vaisala representative.
The reading of the GMW20 can be checked and adjusted with
the serial com adapter 19040GM and the calibration software
available from www.vaisala.com. The checking in the field can
also be done with calibration gas and a multimeter.
Mounting
1. The GMW20 is shipped ready for installation onto a
standard wallbox or onto a surface mounting.
2. Drill a hole in the surface where the transmitter will be
mounted , then pull the wiring through the drilled hole.
3. Open the transmitter cover by pushing forward and
turning a screwdriver head in the slot located at the
bottom between the cover and the back plate.
4. Remove the printed circuit board (PCB) by pressing
upwards with a screwdriver (see Figure 1 on page 3).
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