Rheonics | Switzerland | U.S.A.
SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual
P. 14
Version 2.0, Updated: October 29, 2020
Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland
©Rheonics. Rheonics confidential and proprietary information.
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Selection / identification of wiring scheme depending on intended Pt1000 temperature sensor
connection
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Sensor with 4-wire Pt1000 connection
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3 Zener diode barriers required
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Highest accuracy
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Uses standard sensor
o
Sensor with 3-wire Pt1000 connection
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2 Zener diode barriers required
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Lower accuracy than 4-wire Pt1000 connection
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Uses standard sensor
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May require temperature calibration for best accuracy
o
Sensor with no Pt1000 sensor
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1 Zener diode barrier required
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Uses special sensor with no Pt1000 installed
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Temperature may be measured with external temperature sensor
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Possibility of temperature estimation without external sensor. Please consult
Rheonics for more information regarding accuracy.
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Zener diode barrier selection
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Using Zener diode barriers recommended in this manual
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Using alternative Zener diode barriers that meet the specifications given in this manual.
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Equipotential bonding method selection
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Using cable shield for equipotential bonding
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Using separate bonding conductor
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Different schemes possible depending on requirements of system layout
5.1.
Cabling
The SRV/SRD sensor is connected to its associated Zener diode barriers by means of a cable that
has an 8 pole M12 connector on the sensor end. The end that connects to the Zener diode
barrier must be provided with crimped conductor-end sleeves, which are held by screw clamps
on the Zener diode barriers. Appropriate cabling must conform to the following specifications:
Electrical connections to the M12 connector depend on the presence or absence of the Pt1000,
and in its presence, whether a 3-wire or a 4-wire connection has been selected. For a
connection with no Pt1000, the pins are assigned as in Fig. 6:
