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7. Starting, operation
Ensure that, particularly in the dust hazardous area, the cooling elements
will not be contaminated and that no dust can be deposited on them,
because otherwise the cooling effect cannot be guaranteed.
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Relation of medium temperature to ambient temperature
120
110
100
90
80
70
60
50
40
30
A
20
10
0
40
80
120
Model
IS-20-H
IS-2X-S /-F
Version
A
B
C
Cooling fin
-
2
3
Constant K
0.34
0.47
0.68
Calculation of max. temperature of
ambience:
T
= T
+ (T
- T
) / K
amb
med
B
med
10
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio
B
C
160
200
240
280
Temperature of medium (°C)
Calculation of cooling element:
T
= T
- (T
- T
) x K
D
B
med
med
amb
T
= Operation temperature of transmitter
B
5
T
= max. temperature of process medium
med
0.76
T
= max. temperature of ambience
amb
K
= Constant of cooling element
GB
7. Starting, operation
Electrical connection
Earth the housing, through the process connection, against electromagnetic
!
fields and electrostatic discharge.
Warning
„
Ground the cable screen at one end, preferably in the safe, thus non-Ex,
area (EN 60079-14). For devices with flying leads, the screen is connected
to the housing. The simultaneous connection of housing and cable screen
Warning
to ground is only permitted if ground loop problems between the screen
connection (e.g. at the power supply) and housing can be excluded
(see EN 60079-14).
Supply the pressure transmitter from an intrinsically safe current circuit (Ex ia).
„
Consider both the internal capacitance and inductance.
„
Cover flying leads with fine wires by an end splice (cable preparation).
„
The bayonet-connector is made of light metal, a material which is not permissible for
D
„
group I applications (mining).
Consider that cables for use in zones 1 and 2 must be checked with a test voltage
„
between conductor/earth, conductor/screen, screen/earth of more than 500V (AC).
320
Operate the pressure transmitter with a shielded cable and earth the shield at least
„
on one side of the cable, if the cable is longer than 30 m or if it is run outside of the
building.
Ingress protection per IEC 60529 (The ingress protection classes specified only apply
„
while the pressure transmitter is connected with female connectors that provide the
corresponding ingress protection).
„
Ensure that the cable diameter you select fits to the cable gland of the connector
Ensure that the cable gland of the mounted connector is positioned correctly and
that the sealings are available and undamaged. Tighten the threaded connection and
check the correct position of the sealings in order to ensure the ingress protection.
„
Please make sure that the ends of cables with flying leads do not allow any ingress of
moisture.
IS-2X
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio
GB
11
IS-2X
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