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Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual

P. 29

Version 2.0, Updated: October 29, 2020
Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

1

Zener Barriers, safe area

2

Sensors, Zone 0

3

4 mm

2

individual bonding wires

4

Individual bonding

Figure 14: Individual bonding of sensors to their Zener diode barriers

5.4.3.3.

Multi-drop bonding configuration

A third option, which is a hybrid of the preceding two variants, makes use of a mixture of local
grounding rails for both the Zener diode barriers and the sensors, that connect sensor and
electronics locales in large distributed apparatus, such as multi-station rotogravure presses.
Each sensor and/or Zener diode barrier is connected to a common grounding rail that runs from

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Summary of Contents for SRD

Page 1: ...s Installation of Intrinsically Safe Sensors Manual Applicable to Rheonics Sensor Types SRV SRD SRV FPC SRD FPC Certified ATEX and IECEx Viscometers and Density Meters Product SR Sensors ATEX and IECEx certified Rev 2 0 October 2020 ...

Page 2: ...64 5472 Website https rheonics com Support Portal https support rheonics com Sales E Mail info rheonics com Support E Mail support rheonics com rheonics COPYRIGHT RHEONICS 2020 No part of this publication may be copied or distributed transmitted transcribed stored in a retrieval system or translated into any human or computer language in any form or by any means electronic mechanical manual or oth...

Page 3: ... rating of the sensors according to T class 10 3 2 4 Pressure rating of the sensors 11 3 2 5 Damage protection 11 4 Safe use of ATEX approved equipment 13 4 1 Notes on Safe Use of the ATEX Approved Equipment 13 4 2 Mounting Commissioning and Operation 13 5 Electrical Installation 13 5 1 Cabling 14 5 2 Zener diode barriers 18 5 3 Installation diagrams 20 5 4 Equipotential bonding 25 5 4 1 Bonding g...

Page 4: ...6 Figure 13 Several sensors grounded to common grounding point Star topology 28 Figure 14 Individual bonding of sensors to their Zener diode barriers 29 Figure 15 Hybrid or multi drop bonding 30 Tables Table 1 EX relevant electrical specification for SRV SRD sensors 10 Table 2 Temperatures for gas ignition classes 10 Table 3 Sensor cable specifications 18 Table 4 Transducer coil circuit Zener diod...

Page 5: ...SRD sensors measure in addition fluid density as well as true dynamic and kinematic viscosity Each sensor has a symmetric torsional resonator as its sensitive element The effect of the fluid in which it is immersed on its resonant response its resonant frequency and damping is measured and interpreted by the electronics unit with which it is supplied Both of these devices hereafter referred to col...

Page 6: ...sociated 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 5 1 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 installa...

Page 7: ... proprietary information 3 EX label description Old label New label 1 CE mark Notified body TÜV Rheinland 2 ATEX Marking 3 Explosion classification 4 IECEx certificate number with appended X 5 ATEX certificate number with appended X 6 Sensor 7 Identification Number 8 Sensor Manufacturer 9 See below for Tx and X conditions for explosion classification and certificates Figure 1 Example of sensor lab...

Page 8: ...s Rheonics confidential and proprietary information 1 Intrinsically safe 2 Safe for gas groups IIA IIB and IIC 3 Ignition temperature classes that define ambient fluid temperature range as given in table below 4 Equipment protection level very high Figure 2 IECEx Explosion classification description 1 ATEX Mark 2 Non mining equipment 3 Category 1 Zone 0 4 For gases Figure 3 ATEX marking descriptio...

Page 9: ...occur in normal operation occasionally Zone 2 Area in which an explosive gas atmosphereis not likely to occur in normal operation and if it does occur is likely to do so only infrequently and will exist for a short period only Zone 21 Place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally Zone 22 Place in which a...

Page 10: ...he sensors are specified together with the ambient operational temperature for each class where Ta is the lesser of the process fluid temperature and the ambient temperature surrounding the portion of the sensor outside of the process fluid In typical applications the fluid temperature will be equal to or greater than the ambient temperature so it will determine the temperature class The symbol Tx...

Page 11: ...surrounding equipment permits it If there is insufficient space to install the impact shield the sensor must be protected from mechanical impact as from falling objects by the surrounding equipment In all cases it is the responsibility of the installer to ensure that the sensor cannot be impacted by falling objects or other sources of mechanical impact The shield is installed by sliding the end of...

Page 12: ...ots in protective sleeve exclude any fluid borne particles larger than 8 mm diameter 2 Protective shield 3 Impact shield Figure 4 SRV sensor with protective sleeve and impact shield mounted 1 Impact shield 2 Impact shield must be installed so that slot in shield is facing down Figure 5 End view of SRV showing orientation of slot in impact shield ATTENTION These parameters and conditions must be ad...

Page 13: ...operated and maintained according to the instructions in this and the specific product operating manual Persons handling installing or commissioning this equipment must be authorized and suitably qualified The manual must be read understood and the instructions must be followed Modifications and repairs to the device are only permissible when they are expressly approved in this manual 5 Electrical...

Page 14: ...ut external sensor Please consult Rheonics for more information regarding accuracy Zener diode barrier selection o Using Zener diode barriers recommended in this manual o Using alternative Zener diode barriers that meet the specifications given in this manual Equipotential bonding method selection o Using cable shield for equipotential bonding o Using separate bonding conductor Different schemes p...

Page 15: ...zerland Rheonics Rheonics confidential and proprietary information 1 1 Transducer coil 2 2 Transducer coil 3 3 No connect 4 4 No connect 5 5 No connect 6 6 No connect 7 7 No connect 8 8 No connect 9 Signal assignment version without Pt1000 M12 connector front view Figure 6 Pinout of M12 connector with no Pt1000 installed For a connection with 4 wires the pinout is shown in Fig 7 below ...

Page 16: ...itzerland Rheonics Rheonics confidential and proprietary information 1 1 Transducer coil 2 2 Transducer coil 3 3 No connect 4 4 No connect 5 5 Pt1000 Sens 6 6 Pt1000 Sens 7 7 Pt1000 I 8 8 Pt1000 I 9 Signal assignment Pt1000 4 wire version M12 connector front view Figure 7 Pinout of M12 connector with 4 wire Pt1000 connection For a connection with 3 wires the pinout in Fig 8 is used ...

Page 17: ...t 4 4 No connect 5 5 Pt1000 Sens 6 6 Pt1000 Gnd 7 7 Pt1000 I 8 8 No connect 9 Signal assignment Pt1000 3 wire version M12 connector front view Figure 8 Pinout of M12 connector with 3 wire Pt1000 connection In addition the M12 connector must be rated at IP54 or higher Detailed pinout and connection diagrams are given in section 5 3 below The cable and connector selected must be rated for at least t...

Page 18: ...rriers Each SRV SRD must be connected to its electronics unit through Zener diode barriers as appropriate to the installation There are several different connection options depending on whether or not the SRV SRD has a built in Pt1000 and if so how the Pt1000 is connected 4 or 3 wire connection The diagrams in section below show these options In addition to the proper connection the Zener diode ba...

Page 19: ...wo channels of the Zener diode barriers The Zener diode barriers must be located outside of the hazardous zone or in a zone allowed by the manufacturer s specification They must be properly grounded Commercial Zener diode barriers that fulfill these specifications are For transducer coil circuit Pepperl Fuchs Z757 Table 6 Specification of commercial Zener diode barrier suitable for transducer coil...

Page 20: ... reliable grounding point It is the responsibility of the installer to ensure that the Zener diode barriers are properly and reliably grounded according to the manufacturer s specifications In the event that more than one sensor is used in a system the decision of how to bond the sensors to a grounding point depends on the layout of the system One of the configurations shown in section 5 4 3 below...

Page 21: ... M12 cable connector pins are routed to the proper Zener diode barrier terminals regardless of the actual conductor colors In the following wiring diagrams Figs 9 11 there are three types of ground connections labeled G1 G2 and G3 For the Zener diode barriers G2 is the default grounding connection usually provided by the manufacturer as a grounding clamp that grips the DIN rail on which the Zener ...

Page 22: ...6 Winterthur Switzerland Rheonics Rheonics confidential and proprietary information 1 M12 cable connector female rear view 2 Sensor M12 connector male front view 3 Ground tab optional A Safe Zone B Intrinsically safe cable C Hazardous Zone Figure 9 Variant 1 Wiring diagram with Pt1000 installed 4 wire Pt1000 connection 1 2 5 4 7 8 1 2 5 4 7 8 757 041 1 2 4 5 7 8 0 041 ...

Page 23: ...strasse 19 8406 Winterthur Switzerland Rheonics Rheonics confidential and proprietary information 1 M12 cable connector female rear view 2 Sensor M12 connector male front view 3 Ground tab optional A Safe Zone B Intrinsically safe cable C Hazardous Zone Figure 10 Variant 2 Wiring diagram with no Pt1000 installed 1 2 5 4 7 8 1 2 5 4 7 8 757 1 2 4 5 7 8 0 ...

Page 24: ...06 Winterthur Switzerland Rheonics Rheonics confidential and proprietary information 1 M12 cable connector female rear view 2 Sensor M12 connector male front view 3 Ground tab optional A Safe Zone B Intrinsically safe cable C Hazardous Zone Figure 11 Variant 3 Wiring diagram with Pt1000 installed 3 wire Pt1000 connection 1 2 5 4 7 8 757 1 2 4 5 7 8 0 041 1 2 5 4 7 8 ...

Page 25: ... must be firmly bonded to the shell of the M12 connector used for the sensor connection Follow connector manufacturer s installation instructions 1 4 The cable shield must be securely connected to the grounding terminal of its associated Zener diode barrier 2 If a cable other than the recommended type is used the installer must ensure that its shield cross sectional area is at least 2 5mm2 If this...

Page 26: ... connector shell the hardened spring fingers of the lock washer dig into the shell slightly providing both a electrical bond and a solid mechanical connection The bonding wire which must have a minimum cross sectional area of 4mm2 is then connected to the bonding tab by means of a screw a nut and two toothed lock washers The crown lock washer leaves sufficient space for normal installation of the ...

Page 27: ...onal area is used then no additional configuration of the equipotential bonding must be performed If the shield cross sectional area is insufficient or cannot be verified then one of the following methods may be selected Three different scenarios are possible each of which ensures adequate electrical bonding The particular scheme that is used depends on the overall sensor setup as well as the pref...

Page 28: ...ints at printing press 7 Common grounding points at printing press 8 Star connected bonding Figure 13 Several sensors grounded to common grounding point Star topology 5 4 3 2 Individual bonding conductors A second method which may be more convenient in situations when the safe zone is close to the sensor installation area is to use an individual bonding wire of at least 4mm2 cross section connecti...

Page 29: ...bonding wires 4 Individual bonding Figure 14 Individual bonding of sensors to their Zener diode barriers 5 4 3 3 Multi drop bonding configuration A third option which is a hybrid of the preceding two variants makes use of a mixture of local grounding rails for both the Zener diode barriers and the sensors that connect sensor and electronics locales in large distributed apparatus such as multi stat...

Page 30: ...of at least 4mm2 cross sectional area while the common ground rail must have a cross sectional area of at least 6mm2 This arrangement is shown schematically in the following diagram 1 Zener Barriers safe area 2 Sensors Zone 0 3 4 mm2 individual bonding wires 4 4 mm2 individual bonding wires 5 Grounding rail minimum 6mm2 cross section 6 Multi drop bonding Figure 15 Hybrid or multi drop bonding In a...

Page 31: ...e components inside the electronic compartment 7 Returning Equipment to the factory Instructions for Returning Your Instrument for Service The following information will help you return your instrument to Rheonics and will ensure that your order is processed promptly To request details contact your local Rheonics distributor or contact one of our offices directly Please follow these easy steps to ...

Page 32: ... IECEx Certificate 9 Revisions and approvals Version Nature of changes Approvals Date 1 0 Original version S Kumar J Goodbread 22 06 2020 2 0 1 Minor edits in the existing sections 2 Update of address and addition of revisions table 3 Inclusion of the following sections Safe Use of ATEX approved equipment Maintenance and procedures of return of equipment S Kumar J Goodbread 29 10 2020 For latest c...

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