This document introduces Vaisala CARBOCAP® Co2 module GMM112 and converter GMW115, which are compact CO2 modules and CO2 converters for air conditioning systems. The CO2 measurement range is 0-2000 ppm, and it has various electrical connection options.
This manual provides the installation and operating guidance for the Vaisala GMW115 CO₂ converter and GMM112 module used in HVAC systems. It includes wiring diagrams, dimensions, mounting procedures, and details on the analog and serial interfaces.
The document also describes the serial communication options (RS232 default, optional RS485), command set, technical specifications such as measurement range, accuracy, power requirements, and warranty information, as well as service and calibration contacts. This manual is written in Japanese.
| Measurement range | 0–2000 ppm CO₂ |
|---|---|
| Accuracy | ±2.5 % of range + 3 % of reading |
| Long‑term stability | <100 ppm CO₂ over 2 years |
| Response time | 1 min |
| Temperature dependence | -0.35 %/°C |
| Pressure dependence | +0.15 %/hPa |
| Power consumption | <2 W |
| Analog output | 0–10 V, 4–20 mA |
| Serial interface | RS‑485, 2‑wire, non‑isolated |
| Recommended external load (current) | <500 µA |
| Recommended external load (voltage) | >1 kΩ |
| Mass (GMM112) | 34 g |
| Mass (GMW115) | 105 g |
| Warranty | 1 year under normal use |
The GMM112 measures CO₂ from 0 to 2000 ppm.
The device supports RS‑232 (default) and optional RS‑485 interfaces.
Use an RC termination consisting of a 1 nF capacitor and a 100 Ω resistor at each end of the bus.