Rheonics | Switzerland | U.S.A.
SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual
P. 6
Version 2.0, Updated: October 29, 2020
Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland
©Rheonics. Rheonics confidential and proprietary information.
Rheonics SR sensors are specified to maintain IP54 ingress protection under all operating conditions.
They are hermetically sealed in fully welded AISI 316L housings. Electrical connections are made through
a M12 connector whose contacts are hermetically sealed into a glass insulating disk.
The Zener diode barriers themselves must be situated either outside of any hazardous zone, or in the
zone specified by the manufacturers as safe for the barriers. The
Rheonics SR sensor’s electronics unit
must be situated outside the hazardous zone.
Suitable cabling to safely connect the Rheonics SR sensor to its associated Zener barrier(s) is to be
provided by the installer. The minimum specification for the cabling in order to ensure intrinsic safety is
given in section
Installation of Rheonics SR sensors must be performed by a qualified installer who is familiar with safe
installation practices for intrinsically safe equipment. In addition, the installer must be familiar with the
contents of this installation manual, to ensure that all conditions relevant to maintaining intrinsic safety
of the Rheonics SR sensors are met.
The following topics are covered in the next sections:
•
Description of the
label as it defines the safe operating parameters of the sensor
•
Discussion of limits on specific operating parameters of the Rheonics SR sensors not explicitly
listed on the label, but as indicated by the symbol “X” following the ATEX and IECEx certificate
numbers.
Specification of the Zener diode barrier(s) to ensure safe operation of the Rheonics SR sensors,
as well as specific recommendations for commercially available barriers for use with the
Rheonics SR sensors.
