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 will not cause the intrinsically safe input parameters
listed in Table 25 (page 54) 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 17 (page 54)) 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 16 (page 52)) 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!
3.8 UK (UKEX) 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 UK (UKEX certification).
The Vaisala document code of the UK (UKEX) certification version of HMT370EX Installation
and Safety Guide is M212752EN.
A printed version of the M212752EN installation and safety guide is delivered with the
transmitter in UK (UKEX) certification deliveries, and the document is also available on the
HMT370EX product page www.vaisala.com/HMT370EX.
3.8.1 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
55
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