_________________________________________________________________________________
Vaisala _________________________________________________________________________ 64
APPENDIX 3: WIRING FOR INTRINSICALLY
SAFE OPERATION
, CSA
Replaced
by
Drawn
Review
Appr
Design
Replaces
Scale
id
Title
Arch
no
Serial
Sheet
doc no
Cooperator`s
Dwg no
Re
NOTE:
1. Each channel must be supplied through separate
shielded cables.
2. When using galvanic separators CH1- and CH2-
must be short circuited with an external wire.
3. When using transmitter in Class I, Division 2 the
main switch shall not be operated or the unit shall not
be disconnected unless power has been switched off,
or area is known to be non hazardous.
4. Use only conduit connection in Division 2.
5. Substitution on components may impair intrinsic
safety or suitability for Division 2.
6. Only intrinsically safe installation is allowed in Class II
and Class III environments.
7. Intrinsically safe barrier ground must
be less than 1 ohm.
8. Maximum safe area voltage is 250V.
p
HMT360-series transmitters are approved for use in
Division 1 and 2, Class I, Groups A, B, C, and D.
Division 1, and 2, Class II, Group G and coal dust.
Division 1, and 2, Class III.
Vaisala Oyj
Vanhanurmijärventie 21
Vantaa
Finland
Installation
Drawing
DRW213478
HAZARDOUS AREA
SAFE AREA
HMT360 connection board
-Ch1+
-Ch2+
Load Ch2
Vmax=28VDC
Vmax=28VDC
Load Ch1
KKe 2002-08-21
HMT360-series transmitters shall be used with
following probes:
Probe HMP361 with 116mm lenght pipe.
Probe HMP363 with 2, 5 or 10 m lenght cable.
Probe HMP364 with 2, 5 or 10 m lenght cable.
Probe HMP365 with 2, 5 or 10 m lenght cable.
Probe HMP368 with 2, 5 or 10 m lenght cable.
The material for associated cable is FEP
(Tetrafluoropropylene).
To avoid static discharge shall the cable cover wit
conductive material.
HMT360-series transmitters shall be used with
following zener barrier or galvanic separator types:
Manufacturer: Type:
R. Stahl 9001/51-280-091-14
R. Stahl
9002/13-280-093-00
R. Stahl
9303/11-22-11
MTL
MTL7206
MTL
MTL5044
Cable parameters shall be less than 60pF/ft (197pF/m)
and 0.2µH/ft (0.67µH/m). The maximum cable lenght
is 2000ft (600m).
Max cable lenght 2000ft (600m)
A
