This safety guide provides information on safety requirements and installation instructions for Vaisala transmitter HMT360, including safety barriers, 2-wire connection and sensor cable installation.
This guide explains the safety requirements for installing the HMT360 transmitter in hazardous (ATEX) areas. It details the need for intrinsically safe power supplies or safety barriers, which are not supplied with the unit but can be ordered from Vaisala.
The document also covers the 2‑wire connection (CH1 for humidity, CH2 for temperature), wiring examples, cable shielding requirements, and compliance with EU ATEX Directive 94/9/EC, including temperature and pressure limits and the EEx ia IIC T4 marking. This manual is written in German.