Vaisala HMT360Series Guide de l'utilisateur télécharger pdf (Page 38)

User’s Guide ______________________________________________________________________

36 ___________________________________________________________________ M010056EN-J

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 91.

Canada (CSA): Wiring for intrinsically safe operation is shown in

Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page 93.

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 17 on page 39 and Figure 18 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 19 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 19 on page 41).

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Vaisala HMT360Series Guide de l'utilisateur Page 38