KROHNE BM 70 A_P EN - Manual (Page 67)

Installation and operating instructions BM 70 A/P Page: 67 11/00
10.3 Explosion proof acc. to ATEX
The instruments BM 70 A, BM 70 P and BM 700/702 are approved according to the new hazardous
area directives ATEX 100a (certificate: PTB 99 ATEX 2061X).
Instruments were divided up to the following Categories according to the operating range:
Probability of hazardous atmosphere Ex zone Device in
(G = gas/vapour/mist)
Always, long-term or frequent Zone 0 Device category 1G
Occasional Zone 1 Device category 2G
Not or seldom and then only short-term Zone 2 Device category 3G
The marking of the BM 70 x instrument depends on the converter and the flange system:
Converter with outputs
in Ex-e
Converter with outputs
in Ex-i
Flange system for zone 0 (1G) 1/2 G 1/2 G
Flange system for zone 1 (2G) 2 G (1)2 G
Means:
1/2 G Antenna system in zone 0 (1G), converter in zone 1 (2G)
2 G Converter as well as antenna system only in zone 1 (2G)
(1)2 G Converter and antenna system in zone 1 (2G), but intrinsically safe current loops can go
to/through zone 0 (1G)
The available flange systems for BM 70 A, BM 70 P and BM 700/702 are:
Construction Short term in
ATEX certificate
Device
category
Installation in
Ex zone
Horn antenna or Wave-Guide (with
Metaglass) V96 1G
2)
Zone 0
Wave-Stick with flange plate and
Metaglas WS 1C
1)
1G
2)
Zone 0
Wave-Stick with flange plate WS 1B 2G Zone 1
Wave-Stick without flange plate WS 2A or 2B 2G Zone 1
LP flange system
(horn antenna/Wave-Guide) Not in approval Non-Ex Non-Ex
Remarks:
1) For the Wave-Stick 1C (Zone 0) any electrostatic charging of the stick must be avoided in
operation (otherwise only Zone 1).
2) Zone 0 is only defined for "atmospheric conditions". Therefore in the ATEX certificate the
conditions T = -20...+60 °C and p = 0.8...1.1 bar are assigned to the 1G versions for installation in
Zone 0. This is not new, but now explicitly mentioned in the type test.