This manual introduces the GMT220 series CO2 converter's product overview, parts description, installation, electrical connection, maintenance, calibration and serial commands.
The GMT220 series CO₂ converter from Vaisala is a compact, NDIR‑based instrument for measuring carbon‑dioxide concentrations in industrial environments. It can be mounted on a wall or installed in a duct or chamber and offers optional LCD display and relay outputs.
The manual covers safety information, a description of the unit and its LEDs, step‑by‑step installation, electrical connections, probe replacement, serial command reference, and detailed technical data such as measurement range, accuracy, power consumption and environmental limits. This manual is written in Japanese.
| Accuracy (GMT222) | ±20 ppm CO₂ + 2 % of reading |
|---|---|
| Response time (63 %) | 30 s (GMT222) |
| Operating temperature range | ‑20 °C to +60 °C |
| Power consumption | < 4 W |
| Maximum mass (GMT222) | 300 g |
Connect a nominal 24 V supply to the “+” and “‑” terminals on the motherboard.