GMD20 CO2 transmitter uses a new CARBOCAP sensor technology with superior stability and repeatability. The transmitter can be directly installed in the duct and can optionally be equipped with an electromagnetic valve output and LonWorks interface.
The GMD20 series CO₂ transmitter uses Vaisala's CARBOCAPS sensor technology for high stability and repeatability, suitable for ventilation control and other applications. The manual provides guidance on duct mounting, electrical connections, and optional relay or LonWorks interfaces.
Key sections include installation steps, power supply requirements, wiring diagrams, technical specifications, and service/maintenance recommendations, including yearly calibration and safety warnings. This manual is written in Japanese.
| Measurement range | 0‑2 000 ppm CO, 0‑5 000 ppm CO₂, 0‑10 000 ppm CO₂, 0‑20 000 ppm CO₂ |
|---|---|
| Resolution (analog output) | 0.596 %FS |
| Response time (63 % rise) | 1 min |
| Operating temperature range | -5 °C to +45 °C |
| Operating humidity range | 0‑85 % RH |
| Analog output options | 0‑20 mA or 4‑20 mA, 0‑10 V |
| Current output max | 500 µA |
| Voltage output min | 1 kΩ |
| Relay contact rating | 50 V 0.5 A |
| Power consumption | < 2.5 W average |
| Storage temperature range | -20 °C to +70 °C |
| Weight | 140 g (typical) / 170 g (max) |
Calibration is recommended once a year under normal operating conditions.
The device is designed for a nominal 24 V AC or DC supply, with acceptable ranges of 18‑30 V DC or 20‑26 V AC.
The transmitter can output either 0‑20 mA (or 4‑20 mA) current or 0‑10 V analog voltage.
Contact Vaisala’s after‑sales group or the authorized dealer for assistance.