Manual

12
IM 12D06D05-01E
Figure 3-9a. Dimensions
It is necessary to use screening/shielding on
the output signal cables. Terminal 63 is used to
connect the shielding.
3-6. Wiring the sensor
3-6-1. General precautions
The sensor cable transmits low voltage, high
frequency signals and should be installed
separately from any high voltage, high cur rent
and/or power switching cables. This is to avoid
any unintentional cross talk or other kind of
interference of the conductivity meas ure ment.
3-6-2. Connecting the sensor cable to the
converter
1. To access terminals remove the front cov-
eroftheEXAxtISC450Gbyreleasingthe
4captivescrews.
2. Loosenthecableglandandpullthecable
in the connection compartment.
3. The sensor leads are numbered and the
leads must be connected to the ter mi nals
with the corresponding number, re fer to
Fig.3-4:thetemperaturecompensator
with 11/12
- the drive coil with 15/16
- the receive coil with 13/17
 Terminal14isforconnectionoftheshield.
4. ScrewthecableglandtighttoensureIP66
(NEMA4X)environmentalprotection.An
optional protection hose (flexible con duit)
is available for additional me chan i cal pro-
tec tion of the sensor cable.
3-6-3. Installation of the sensor
TheModelISC40isa“doughnut”shapedsen-
sor. Preferably, the process will flow through
the hole of the donut with the temperature com-
pensatorup-stream.Forminimalobstructionof
the flow and for accurate measurement without
the need for calibration of the cell constant, the
process will flow freely around the doughnut,
allowingaminimumdistanceof25mm(1”)
between doughnut and process piping (d).
The sensor is provided with a gasket and
retainingnut.Thisallows“bulkheadmounting”
in tank wall or standard flange through a hole of
27mm(1.1”)diameter(A).Theinsertionis125
mm under the flange.
Two flats are provided with wrench size 20 mm
(0.8”)toalloweasymountingandalignmentof
the sensor. The model identification on one flat
alignswiththe“up-stream”positionofthesen-
sor.ForOn-linemountingadaptersareavail-
ableforstandard2”processconnection(Gas
thread,NPT,ANSI-flange,DIN-flange).
Forby-passmeasurementflowfittingsare
available in polyporpylene, polyvinylidene flour-
ideandStainlessSteel.
Formeasurementsinopenductsorvesselsan
immersionfittinginCPVCorStainlessSteelis
available.
Foreasywiringthesensormustbelocated
within5m(15”)fromtheconverterusingthe
integral sensor cabling.