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HMT370EX User Guide
Region
FM (US)
MET (US/CAN)
UKEX (UK)
3.2 ATEX/IECEx safety certification information
This chapter contains the safety certification information (for example, specific conditions of
use) related to the ATEX (EU) and IECEx (international) certifications.
The Vaisala document code of the multilingual (EN, DE, FR, NL, ES, PT, IT, HU, CS, PL, FI, ET, SV,
NO, DA) ATEX and IECEx version of HMT370EX Installation and Safety Guide is M212306EN.
A printed version of the M212306EN installation and safety guide is delivered with the
transmitter in ATEX/IECEx deliveries, and the document is also available on the HMT370EX
product page www.vaisala.com/HMT370EX.
3.2.1 Using HMT370EX Series transmitters in hazardous
locations
WARNING!
mandatory in a hazardous environment.
In hazardous environments, always connect the transmitters via galvanic isolators or Zener
barriers. A galvanic isolator or Zener barrier must also be used when the transmitter and probe
body are in a safe area, but the probe head is installed in a hazardous environment. For wiring
information, see the galvanic isolator and Zener barrier wiring diagrams included in this
document.
20
Protected installation using galvanic isolators or Zener barriers is
Ex classification
Class I, Zone 0, AEx ia IIC T4 Ga
Zone 20, AEx ia IIIC T85°C Da
IS Class I, Division 1, Groups A, B, C, and D T4
IS Class II, III, Division 1, Groups E, F, and G T85°C
Class I, Zone 0, AEx ia IIC T4 Ga
Class II, Zone 20, AEx ia IIIC T 85°C Da
Class I, Division 1, Groups A, B, C, and D T4
Class II, Division 1, Groups E, F, and G T 85 °C
Ex ia IIC T4 Ga
Ex ia IIIC T 85 °C Da
II 1 G Ex ia IIC T4 Ga
II 1 D Ex ia IIIC T200 85 °C Da
−40 °C ≤ Tamb ≤ +60 °C
CML 21UKEX2316X
M212305EN-B
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