This document introduces the features and characteristics of the GMD20/D CO2 sensor, including the working principle, installation method, and electrical connection.
This manual introduces the Vaisala GMD20/D carbon‑monoxide (CO) transmitter, which uses the CARBOCAP® sensor technology. It describes the device’s low‑maintenance design, recommended five‑year calibration interval, and typical applications in HVAC and other indoor installations.
The guide covers step‑by‑step installation, electrical connections, power‑supply requirements, LED status indicators, and troubleshooting. It also includes technical specifications such as measurement range, accuracy, environmental limits, power consumption, and mechanical data, as well as optional accessories and warranty information.
| Response time | 1 minute |
|---|---|
| Short‑term humidity range | 0‑100 % RH |
| Weight (GMD20/D) | 170 g |
| IP rating | IP65 |
The recommended calibration interval is five years under normal indoor conditions.