The transmitter body enclosure must not be opened in an explosion
hazardous area, unless a safe work permit has been issued in accordance with
the standard IEC 60079-14. Either remove the transmitter from the hazardous
area before opening the enclosure, or ensure that an IEC 60079-14 compliant
safe work procedure has been implemented in the hazardous area.
CAUTION!
Use an intrinsically safe multimeter that won't cause the intrinsically safe input parameters
listed in Table 19 (page 42) to be exceeded when it is connected in series (current
measurement) or parallel (voltage measurement) to the associated apparatus.
Using the service port
The service port (see Figure 12 (page 42)) must only be used in a safe area. Either remove the
transmitter from the hazardous area or ensure that a safe work procedure has been
implemented in the hazardous area. Only use the Vaisala accessory PC connection cable with
the service port.
Maintenance
The probe (includes probe body and head) can be detached and replaced by the user. The
probe head filter (see Figure 11 (page 40)) is also user-replaceable. For other maintenance
requirements, contact Vaisala.
The probe can be detached and changed when HMT370EX is
powered. Any other live maintenance, including changing the probe head filter,
is not allowed.
CAUTION!
3.6 US (FM) 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 (Factory Mutual (FM)
certification).
The Vaisala document code of the US (FM) certification version of HMT370EX Installation and
Safety Guide is M212733EN.
A printed version of the M212733EN installation and safety guide is delivered with the
transmitter in US (FM) certification deliveries, and the document is also available on the
HMT370EX product page www.vaisala.com/HMT370EX.
3.6.1 Using HMT370EX Series transmitters in hazardous
locations
Protected installation using galvanic isolators or Zener barriers is
mandatory in a hazardous environment.
WARNING!
Chapter 3 – HMT370EX regional safety certification information
43
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