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VAISALA _________________________________________________________________________ 5 
List of Figures 
Figure 1  GMW90 with Visible Display and Indicator LEDs .................... 12 
Figure 2  Transmitter Parts - Outside ...................................................... 15 
Figure 3  Opening the Transmitter........................................................... 16 
Figure 4  Transmitter Parts – Inside ........................................................ 17 
Figure 5  Decorative Cover ...................................................................... 18 
Figure 6  DIP Switch Settings of Analog Output Models ......................... 20 
Figure 7  DIP Switch Settings of Digital Output Models .......................... 22 
Figure 8  Example of Transmitter Addressing ......................................... 23 
Figure 9  Selecting Transmitter Location ................................................. 24 
Figure 10  Installing the Mounting Base .................................................... 25 
Figure 11  Wiring from Behind (Recommended) ....................................... 26 
Figure 12  Wiring from Above .................................................................... 26 
Figure 13  Wiring GMW93R/RA ................................................................ 27 
Figure 14  Alternate Wiring for GMW93R/RA ............................................ 27 
Figure 15  Wiring GMW93 ......................................................................... 27 
Figure 16  Wiring GMW94R ...................................................................... 28 
Figure 17  Wiring GMW94 ......................................................................... 28 
Figure 18  Wiring GMW95 ......................................................................... 29 
Figure 19  Several Transmitters on Same RS-485 Line............................ 29 
Figure 20  Connecting a Common AC Power Supply ............................... 30 
Figure 21  GMW95R Startup Screens ....................................................... 31 
Figure 22  Measurement Screen – Normal Operation .............................. 32 
Figure 23  Measurement Screen – Problem With Humidity  
Measurement ........................................................................... 32
 
Figure 24  PuTTY Terminal Application..................................................... 36 
Figure 25  Effect of Pressure on CO
2
 Reading.......................................... 66 
Figure 26  Trimmer Centering Screen ....................................................... 67 
Figure 27  Adjustment Screen ................................................................... 67 
Figure 28  Disconnecting the GM10 Module ............................................. 70 
Figure 29  Foam Pipe Inside GMW90 ....................................................... 71 
Figure 30  Replacing the HTM10 Module .................................................. 72 
Figure 31  DIP Switch Factory Reset (GMW93/94) ................................... 77 
Figure 32  DIP Switch Factory Reset (GMW95) ........................................ 77 
Figure 33  GMW90 Series Dimensions ..................................................... 83 
Figure 34  Dimensions of the Mounting Base ........................................... 83