Using the service port
The service port (see Figure 10 (page 37)) 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 9 (page 34)) 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!
3.5 Korea safety certification information
This chapter contains the safety certification information (for example, specific conditions of
use) related to the HMT370EX Series Ex certification in Korea.
The Vaisala document code of the multilingual (English and Korean) Korea certification (KCs)
version of HMT370EX Installation and Safety Guide is M212717EN.
A printed version of the M212717EN installation and safety guide is delivered with the
transmitter in Japanese certification deliveries, and the document is also available on the
HMT370EX product page www.vaisala.com/HMT370EX.
3.5.1 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 User Guide M212305EN-B
38
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