Vaisala GMW20 - Handbuch (Seite 4)

User’s Guide_____________________________________________________ GMW20
2
Basics of the GMW20
Series
Vaisala’s GMW20 series transmitters use silicon based
CARBOCAP

sensor with excellent stability and reliability
properties. The series consist of the following transmitter types:
GMW21 and display version GMW21D (80x108.5x35) mm
GMW22 and display version GMW22D (80x80x35) mm
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).