3.7 US/CAN (MET) safety certification information
This chapter contains the safety certification information (for example, specific conditions of
use) related to the HMT370EX Series Ex certification in the US/CAN (MET certification).
The Vaisala document code of the US/CAN (MET) certification version of HMT370EX
Installation and Safety Guide is M212707EN.
A printed version of the M212707EN installation and safety guide is delivered with the
transmitter in US/CAN (MET) certification deliveries, and the document is also available on the
HMT370EX product page www.vaisala.com/HMT370EX.
3.7.1 Using HMT370EX Series transmitters in hazardous
locations
Protected installation using galvanic isolators or Zener barriers is
mandatory in a hazardous environment.
WARNING!
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.
HMT370EX does not include a galvanic isolator or a Zener barrier. They can be ordered as
optional accessories from Vaisala.
HMT370EX series transmitters have been designed for use in
hazardous locations as specified by the product classification. The personnel
installing, using, or maintaining HMT370EX transmitters are responsible for
determining the appropriate protection concept for the specific application
HMT370EX is used in, and that the hazardous area classification of the device
meets the requirements of the application.
WARNING!
If the equipment is used in a manner not specified by Vaisala, the
protection provided by the equipment may be impaired.
WARNING!
HMT370EX series transmitters are certified for use in hazardous areas as defined by the
following classifications:
HMT370EX User Guide M212305EN-B
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