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:
Table 26 HMT370EX series hazardous area classifications
Certification HMT370EX classification
IECEx
1)
/ ATEX
2)
II 1 G Ex ia IIC T4 Ga
II 1 D Ex ia IIIC T
200
85 °C Da
-40 °C ≤ T
amb
≤ +60 °C
UKEX (UK) 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
1) International certification
2) EU certification
The personnel installing, operating, and maintaining HMT370EX
transmitters must have the required competencies for working in the hazardous
location, as defined by the applicable standards.
CAUTION!
HMT370EX User Guide M212305EN-B
56
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