Installation in hazardous locations, Us and canadian requirements, European requirements – Vaisala HMT360N User Manual
Page 38: Category 1 (zone 0), Category 2 or 3 (zone 1 or 2), Us and canadian requirements european requirements
User's Guide ______________________________________________________________________
36 __________________________________________________________________ M210744EN-C
Installation in Hazardous Locations
US and Canadian Requirements
USA (FM): Wiring for intrinsically safe operation is shown in
Appendix B, Wiring for Intrinsically Safe Operation, FM, on page 87
.
Canada (CSA): Wiring for intrinsically safe operation is shown in
Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page 89
.
European Requirements
CATEGORY 1 (Zone 0)
HMT360 has to be connected to Exia-certified associated apparatus
with galvanic isolation, gas group IIB or IIC.
CATEGORY 2 or 3 (Zone 1 or 2)
HMT360 has to be connected either to a Zener barrier or galvanic
isolator
Figure 16 on page 39
and
Figure 17 on page 40
present examples of
galvanic isolators and Zener barrier connections (only Ch 1 connected).
NOTE
If both analog outputs are in use, the Ch 1 (-) and Ch 2 (-) must be short
circuited (see
Figure 18 on page 41
).
NOTE
If both analog outputs are in use with a galvanic isolator, the Ch 1 (-)
and Ch 2 (-) must be short circuited (see
Figure 18 on page 41
).