This document is the user manual for the Vaisala MMT330 humidity and temperature transmitter. The transmitter is designed for measuring humidity and temperature in oil, and it offers high accuracy and reliability.
This manual describes the Vaisala MMT330 transmitter, a humidity and temperature sensor designed for oil in paper machines, transformers and other high‑pressure oil applications. It includes safety considerations, product overview, and optional probe options.
Key sections cover mechanical mounting (wall, DIN‑rail, pole kits), electrical wiring (24 VCA supply, grounding, analog and relay outputs), communication interfaces (LAN, WLAN, RS‑422/485), software configuration (display/keyboard, serial commands, web interface), calibration of humidity and temperature, and periodic maintenance procedures. This manual is written in French.