RHEONICS SRV Manuale utente

ATEX and IECEx Certified Sensors

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

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 2

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

GLOBAL SUPPORT

For Support, visit: https://support.rheonics.com

EUROPE HEADQUARTERS

Rheonics GmbH

Klosterstrasse. 19

8406 Winterthur Switzerland

Tel: +41 (0)52 511 32 00

US HEADQUARTERS

Rheonics, Inc.

3 Sugar Creek Center Blvd, Ste 100

Sugar Land, TX 77478

United States of America

Tel: +1 713 364 5472

Website: https://rheonics.com

Support Portal: https://support.rheonics.com

Sales E-Mail: info@rheonics.com

Support E-Mail: supp[email protected]om

rheonics

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 otherwise, or disclosed to third parties without the

express written permission of Rheonics. The information contained in this manual is subject

to change without notice.

TRADEMARKS

Rheonics is a trademark of Rheonics, Inc. Other product and company names listed in this

manual are trademarks or trade names of their respective manufacturers.

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 3

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

Contents

1. Purpose of this manual ........................................................................................................................................5

2. Description of the sensors and general installation considerations ..................................................................5

3. EX label description:.............................................................................................................................................7

3.1. General note on Category of protection and operating zone......................................................................9

3.2. Description of “X” conditions: operating conditions not described on the label, but that are necessary in

order to maintain intrinsic safety..............................................................................................................................9

3.2.1. Area classification & Gas Grouping .....................................................................................................9

3.2.2. Electrical parameters relevant to intrinsic safety..............................................................................10

3.2.3. Temperature 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/grounding conductor ..........................................................................................................25

5.4.2. Bonding to the sensor .......................................................................................................................26

5.4.3. Bonding configurations .....................................................................................................................27

6. Maintenance ...........................................................................................................................................................31

6.1. External Maintenance ......................................................................................................................................31

6.2. Sensor Maintenance.........................................................................................................................................31

6.3. Internal Maintenance.......................................................................................................................................31

7. Returning Equipment to the factory ......................................................................................................................31

8. Intrinsic safety certificates......................................................................................................................................32

9. Revisions and approvals .........................................................................................................................................32

English version of this manual is the only approved version from Rheonics and

installers should refer to it to confirm the correctness of information. In case of

any questions contact your local partner or Rheonics support.

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 4

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

Figures

Figure 1: Example of sensor labels identifying the markings ....................................................................... 7

Figure 2: IECEx Explosion classification description...................................................................................... 8

Figure 3: ATEX marking description..............................................................................................................8

Figure 4: SRV sensor with protective sleeve and impact shield mounted..................................................12

Figure 5: End view of SRV showing orientation of slot in impact shield..................................................... 12

Figure 6: Pinout of M12 connector with no Pt1000 installed.....................................................................15

Figure 7: Pinout of M12 connector with 4-wire Pt1000 connection ..........................................................16

Figure 8: Pinout of M12 connector with 3-wire Pt1000 connection ..........................................................17

Figure 9: Variant 1 - Wiring diagram with Pt1000 installed, 4-wire Pt1000 connection ............................22

Figure 10: Variant 2 - Wiring diagram with no Pt1000 installed.................................................................23

Figure 11: Variant 3 - Wiring diagram with Pt1000 installed, 3-wire Pt1000 connection ..........................24

Figure 12: Installation of grounding tab on SRV/SRD sensor......................................................................26

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 diode barrier specifications............................................................ 18

Table 5: Pt1000 circuit(s) Zener diode barrier specifications .....................................................................19

Table 6: Specification of commercial Zener diode barrier suitable for transducer coil circuit ..................19

Table 7: Specification of commercial Zener diode barrier suitable for Pt1000 circuit(s) ........................... 19

Introduction

The operational conditions cited in this manual are essential to and pertain only to the maintenance

of intrinsic safety of the device. Operational conditions required for achieving the specified

measurement accuracy and operational factors not relevant to operation in explosive atmospheres

are given in the configuration data sheet supplied with the sensor. Please refer to the sensor

configuration data sheet before installing and operating the sensor.

This is a certified ATEX document. Changes must be approved by the Rheonics

EX Authorized Personnel.

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 5

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

ATTENTION: Installation in hazardous environment locations shall be

made in accordance with IECEx 60079-14 and other applicable codes

and standards.

1. Purpose of this manual

This manual contains information to enable the safe installation and operation of Rheonics SRV, SRV-

FPC, SRD and SRD-FPC sensors in areas that potentially contain explosive atmospheres. The manual is an

adjunct to the operation and configuration manual provided with the particular sensor to be installed. It

applies only to Rheonics SRV, SRV-FPC, SRD and SRD-FPC sensors labelled with the hexagonal ATEX

mark:

All other versions of Rheonics SRV/SRD sensors should NOT be considered safe to use in areas with

potential presence of explosive atmospheres.

2. Description of the sensors and general installation considerations

Rheonics SRV sensors are used to measure and control the viscosity of fluids, mainly under process

conditions. Rheonics 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 collectively as “SR” sensors, are delivered in a version that is

intrinsically safe. That means that as long as the sensors are installed and operated as specified in this

manual, they are incapable of igniting explosive atmospheres in which they operate, provided they are

operated within the envelope of parameters described in this manual.

Each Rheonics SR sensor is delivered paired with an electronics unit that both operates the sensor and

transmits its measurement values over one of a variety of interfaces. The electronics unit is not itself

intrinsically safe. When operating Rheonics SR sensors in a hazardous area, one or more Zener diode

barriers must be installed between the Rheonics SR sensor and its electronics unit. This barrier serves to

limit the amount of current and voltage available to the sensor in case of a fault in its electronics unit

and/or within the sensor itself. The specifications for the required barriers are given in section 5.2

below.

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 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 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.

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 7

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

3. EX label description:

Old label

New label

CE mark Notified body: TÜV Rheinland

ATEX Marking

Explosion classification

IECEx certificate number with appended “X”

ATEX certificate number with appended “X”

Sensor

Identification Number

Sensor Manufacturer

See below for “Tx” and “X” conditions for explosion - classification and certificates

Figure 1: Example of sensor labels identifying the markings

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 8

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

Intrinsically safe

Safe for gas groups IIA, IIB and IIC

Ignition temperature classes that define ambient/fluid temperature range, as

given in table below

Equipment protection level = very high

Figure 2: IECEx Explosion classification description

ATEX Mark

Non-mining equipment

Category 1 (Zone 0)

For gases

Figure 3: ATEX marking description

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 9

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

©Rheonics. Rheonics confidential and proprietary information.

3.1. General note on Category of protection and operating zone

3.2. Description of “X” conditions: operating conditions not described on the

label, but that are necessary in order to maintain intrinsic safety

Certain operating conditions must be met in order to ensure that the sensors and their

associated Zener diode barriers meet intrinsic safety criteria. These include:

•Electrical parameters

•Operating temperature ranges

•Safe hydrostatic pressure limits

•Maintenance of ingress protection

•Protection against mechanical impact

•Protection against solid materials transported by fluid being monitored

3.2.1. Area classification & Gas Grouping

Area classification

Zone 1

Area in which an explosive gas atmosphere is likely to occur in

normal operation occasionally

Zone 2

Area in which an explosive gas atmosphere is 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 an explosive atmosphere in the form of a cloud of

combustible dust in air is not likely to occur in normal operation but,

if it does, will persist for a short period only

Gas Grouping

Group IIA

Propane

Group IIB

Ethylene

Group IIC

Hydrogen and Acetylene

Although the sensors are specified for Category 1 (hazardous Zone 0), they may also be used

for Categories 2 and 3 (Zones 1 and 2). However, if the sensor has been used in a Category 3

(Zone 2) installation, it is no longer safe to use in categories 1 and 2 (Zones 0 and 1), because

of the risk that the sensor has been damaged. It is the responsibility of the installer and the

end user to ensure that any Rheonics SRV or SRD sensor that has been used in a Category 2

installation is not re-used for Category 1 or 2 installations.

Rheonics | Switzerland | U.S.A.

SRV, SRD, SRV-FPC, SRD-FPC Installation and Intrinsic Safety Manual P. 10

Version 2.0, Updated: October 29, 2020

Rheonics GmbH, Klosterstrasse 19, 8406 Winterthur, Switzerland

3.2.2.Electrical parameters relevant to intrinsic safety

Table 1: EX-relevant electrical specification for SRV/SRD sensors

Parameter

RTD (Pt1000) circuit

Transducer coil circuit

7.3V

5 mA

730mA

41 mW

1.3W

negligible

<44µH

The two circuits are considered independent because they are electrically isolated from one

another.

3.2.3.Temperature rating of the sensors according to T class

The following temperature class table shows the range of ignition temperature classes for which

the 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” refers to the corresponding symbol on the sensor EX

label. It refers to the temperature classes listed on the following Table 2. However, the user

must be aware that these temperatures only show the limits for safe operation of the sensor in

different explosive atmospheres. The actual temperature range over which the sensor will

function accurately and without functional damage is shown on the individual configuration data

sheet provided with each sensor.

Table 2: Temperatures for gas ignition classes

(T class)

-

-

-

-85°C

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