Intrinsic safety barriers – Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A User Manual
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APPENDIX II
INTRINSIC SAFETY BARRIERS
Model 1036E and 1036F Electrostatic Fieldmeter Probes meet Factory Mutual Research Corporation
requirements for Class I, Division 1, Groups C and D hazardous locations when installed in accordance with the
appropriate Monroe Electronics, Inc. control drawings included in this manual. Approved safety barriers must be
used as shown in the drawings to comply.
Copies of the Factory Mutual Research Corporation report 1Q3A9.AX specific to these probes are available on
request from Monroe Electronics, Inc.
Two manufacturers of IS barriers are currently approved:
MTL, Incorporated
and
R. Stahl, Inc.
8576 Wellington Road
9001 Knight Road
PO Box 1690
Houston, TX 77054
Manassas, VA 22110-1690
www.rstahl.com
www.mtl-inst.com
(800) 782-4357
Tel. (703) 361-0111
(713) 792-9300
Fax. (703) 368-1029
Fax. (713) 797-0105
Barrier requirements and recommended enclosures are shown in the tables below:
Number of
Channels
1
2
4
6
8
10
12
14
16
Number of Barriers
MTL 765
2
4
8
12
16
20
24
28
32
MTL 766
2
4
8
12
16
20
24
28
32
Recommended Enclosures
MT 5
1
MT 12
1
MT 24
1
1
2
2
MT 32
1
2
2
Table 3 — MTL
NOTES for MTL Systems:
Enclosures include barrier mounting hardware, tagging strips, etc. Labeled wiring ducts are included with MT
32.
Listed enclosures are glass-filled polycarbonate with transparent lids. They are impact resistant, flame
retardant and dustproof to IEC529:IP65.
MTL will install barriers at no charge if supplied with position (sequence) information.
"Internals" (everything that normally goes in an enclosure but no enclosure) are available.
Number of
Channels
1
2
4
6
8
10
12
14
16
Number of Barriers
9002/77-150-300-00
2
4
8
12
16
20
24
28
32
9002/22-240-160-00
2
4
8
12
16
20
24
28
32
Recommended Enclosures
S 806 NF-12
1
1
S 1412 NF-25
1
1
S 1412 NF-50
1
1
1
S24H20BLP-80
1
1
Table 4 - R. Stahl