User manual VAISALA GMD-W20 DATASHEET 1

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VAISALA GMD-W20 DATASHEET (375 ko)

Manual abstract: user guide VAISALA GMD-W20DATASHEET 1

Detailed instructions for use are in the User's Guide.

 [. . . ] Box 26,  FI-00421 Helsinki,  FINLAND Tel: +358 9 894 91 Fax: +358 9 8949 2485 Email: industrialsales@vaisala. com www. vaisala. com/GM20

GMD/W20 Series Carbon Dioxide Transmitters for Demand Controlled Ventilation Applications
Features/Benefits

· · · · · ·

Versatile transmitters Duct and wall mount models Incorporates Vaisala CARBOCAP® Sensor - the silicon-based NDIR sensor Excellent long-term stability Negligible temperature dependence Ease of installation

The GMD/W20 series transmitters are designed for use in ventilation-related applications. 

The duct mounted Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMD20 and wall mounted GMW20 are specially designed for Demand Controlled Ventilation (DCV). They are easy to install and require no maintenance.  [. . . ] The simple structure and reference measurement capabilities make this Single-Beam,  DualWavelength NDIR sensor extremely stable and reliable. The temperature and flow dependences of the sensor are negligible. In addition,  the measurement accuracy is not affected by dust,  water vapor and most chemicals. 

Temperature option
The GMA20T temperature module,  an option with the GMW21 wall mount unit,  combines both CO2 and temperature measurement into one transmitter. 10 V corresponding to a temperature range of 0 . . . +122 °F). 

96

Vaisala Instruments Catalog 2009
Ref. A

GMD/W20

CARBON DIOXIDE

Technical Data
Performance
Carbon dioxide measurement Measurement range 0 . . . 2000 ppm (nominal; can be calibrated for other ranges: 0 . . . 20, 000 ppm) Accuracy (including repeatability,  non-linearity and calibration uncertainty) ± (2 % of range + 2% of reading) Long-term stability <±5 % of range / 5 years Response time (63%) 1 minute Warm-up time 1 minute,  15 minutes full specifications Temperature measurement (optional with GMW21) Output signal 0 . . . 10V Corresponding measurement range 0 . . . +122 °F) Accuracy at +25 °C ±0. 5 °C (0. 9 °F) Warm up time 30 min Temperature sensor Semiconductor IC

Dimensions

Dimensions in mm GMD20 and GMD20D

Inputs and outputs
Outputs Optional outputs

42

Resolution of analog outputs Recommended external load: current output max.  [. . . ] Specifications subject to change without prior notice. ©Vaisala Oyj

Vaisala Instruments Catalog 2009
Ref.  [. . . ]

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