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CO₂ Transmitter Series GM20

CO₂ Transmitter Series GM20
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GMD20 Series Carbon Dioxide Transmitters For Demand Controlled Ventilation Applications Features • Versatile transmitters • Reliable measurement with sensor inside the duct • Incorporates Vaisala CARBOCAP® sensor - the silicon-based NDIR sensor • Excellent long-term stability • Negligible temperature dependence • Ease of installation The duct mounted Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMD20 is specially designed for demand controlled ventilation (DCV). The transmitters are easy to install and require no maintenance. The recommended calibration interval is five years. Vaisala CARBOCAP® Technology The GMD20 series transmitters use the silicon-based Vaisala CARBOCAP® sensor. The simple structure and reference measurement capabilities make this single-beam, dual-wavelength NDIR sensor extremely stable and reliable. The temperature and flow dependencies of the sensor are negligible. In addition, the measurement accuracy is not affected by dust, water vapor, and most chemicals. Versatile Transmitters The GMD20 series transmitters can be used independently, or incorporated into building energy management systems. The series consists of duct mount units GMD20 and GMD20D. Version D is equipped with a display. The compact sensor head design of the duct units fits inside the ventilation duct, eliminating the risk of leaking gaskets and measurement errors. In addition to the standard 0 ... 20 mA, 4 ... 20 mA, and 0 ... 10 V outputs, there are two other options: one LonWorks® interface and a relay output. The relay output is standard with the display units. Improve Indoor Air at Minimal Energy Costs The use of GMD20 series transmitters ensures the best possible control of air quality and results in considerable savings in energy consumption, maintenance, and recalibration costs.

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Measurement Performance Spare Parts and Accessories Carbon Dioxide Measurement range Accuracy (including repeatability, nonlinearity and calibration uncertainty) Long-term stability Response time (63 %) Warm-up time 0 ... 2000 ppm (Nominal; can be calibrated for other ranges: 0 ... 5000 ppm, 0 ... 10 000 ppm, 0 ... 20 000 ppm) ± (2 % of range + 2 % of reading) < ±5 % of range / 5 years 1 minute 1 minute, 15 minutes full specifications Display and relay option for GMD20 GMI21 Relay output option GMR20 LonWorks® module with CO2 signal GML20 (not available when display option is added) Serial...

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