Vaisala HMT360 - Manual (Page 57)

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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.
Wiring diagram for intrinsically safe operation of the HMT360-series humidity
and temperature transmitter.
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 127mm long pipe.
Probe HMP362 with 2, 5 or 10 m length cable
Probe HMP363 with 2, 5 or 10 m length cable
Probe HMP364 with 2, 5 or 10 m length cable
Probe HMP365 with 2, 5 or 10 m length cable
Probe HMP367 with 2, 5 or 10 m length cable
Probe HMP368 with 2, 5 or 10 m length cable
The material for associated cable is FEP
(Tetrafluoropropylene) or for HMP363 also PUR
(Polyurethane) available.
To avoid static discharge shall the cable cover with
conductive material.
Vaisala offers following barrier and galvanic isolator types:
Manufacturer: Type: Vaisala code:
Barrier: R. Stahl 9001/51-280-091-141 210664
Isolator: R. Stahl 9160/13-11-11 212483
If other barrier or galvanic isolator types are used,
Vaisala or CSA do not take responsibility for the selected
barrier's or galvanic isolator's suitability!
Cable parameters shall be less than 60pF/ft (197pF/m)
and 0.2µH/ft (0.67µH/m). The maximum cable length
is 2000ft (600m).
Max cable length 2000ft (600m)
C
IML 2002-10-06
KKe 2002-10-06
DRW213478B
C Probe types and barrier/isolator info updated ECO212844 KKe 2006-06-20 RHA 2006-06-20 HJJ