Installation In Hazardous Locations; Us And Canadian Requirements; European Requirements; Category 1 (Zone 0) - Vaisala HUMICAP HMT360 SERIES User Manual

User's Guide ______________________________________________________________________
NOTE
NOTE
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
Canada (CSA): Wiring for intrinsically safe operation is shown in
Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page

European Requirements

CATEGORY 1 (Zone 0)

HMT360 has to be connected to Exia-certified associated apparatus
with galvanic isolation, gas group IIB or IIC.
If both analog outputs are in use, the Ch 1 (-) and Ch 2 (-) must be short
circuited (see Figure 18 on page

CATEGORY 2 or 3 (Zone 1 or 2)

HMT360 has to be connected either to a Zener barrier or galvanic
isolator
If both analog outputs are in use with a galvanic isolator, the Ch 1 (-)
and Ch 2 (-) must be short circuited (see
Figure 16 on page 39
galvanic isolators and Zener barrier connections (only Ch 1 connected).
41).
Figure 18 on page
and Figure 17 on page 40
87.
41).
present examples of
89.