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GuaRdboX
Safety Manual for limit switch boxes series GP, GI and GD
Table of Contents
0 Introduction ...............................................................................................................................................................................1
1
Functional specification .................................................................................................................................................1
2 Configuration of the product................................................................................................................................. 2
3 Constraints of use ............................................................................................................................................................ 6
4 Failure modes and estimated failure rates .............................................................................................8
5 Periodic tests .......................................................................................................................................................................... 9
6 Periodic maintenance ....................................................................................................................................................... 9
7
Hardware fault tolerance ...................................................................................................................................... 9
8 Classification.......................................................................................................................................................................... 9
9 Mean repair time ................................................................................................................................................................... 9
10
Systematic Capability ................................................................................................................................................ 9
11
Troubleshooting ............................................................................................................................................................ 10
12
Certificate of conformity ....................................................................................................................................... 11
0 Introduction
Purpose of this Safety Manual, written in compliance with IEC 61508-2, Annex D, is to give all the necessary information to
the system integrator for a correct use of the product in Safety Instrumented Systems for SIL classified applications.
This Safety manual is related to limit switch boxes series GI, GD and GP and in particular to the models containing the types
of contacts indicated in the table shown on the product Conformity Certificate.
1
Functional specification
Guardbox Limit switch boxes are electromechanical devices ideal for monitoring the remote operation of industrial valves in
plants, designed and manufactured for demanding applications in extreme environments and where there are requested high
standards for safety and reliability products. The Guardbox devices are used to control the position of the valve and provide
high accuracy electrical feedback signal of valve status to plant control systems. Guardbox limit switch boxes are built to be
installed on valves or actuators which drive the process valves from closed to open position (Normal acting) or from open to
closed position (Reverse acting). Normal acting is considered full CW when the process valve is closed and CCW when the
process valve is open. Reverse acting is full CW when the process valve is open and CCW when the process valve is
closed. The Figure 1 below shows a valve on which other parts are mounted via bracket and coupling elements to provide
the desired valve control function such as the actuator, the electrical solenoid and the limit switch box in its different contact
configurations. The Limit switch box when used with Safety Function shall give an electrical signal when:
a)
the actuator starts to drive the emergency valve to its safe position, or
b)
the actuator reaches the safe position
The choice of the Safety Function is responsibility of the system integrator.
note !:
In both cases, the Safety Function shall correspond to the situation in which the switches pass from "operating
position" to "released position", i.e., the Limit Switch Box, when used with Safety Function, shall work in "De-Energize-To-
Trip" mode, and shall be configured in that way to perform the Safety Function.
The above Safety Function is realized when the cam arrives on the activation point of the sensor causing the contact
switching.
To guarantee the "De-Energize-To-Trip" operation, the customer connection shall be made on the NO contact/s.
The Limit Switch Box is intended to be a part of a Safety Instrumented System as defined per IEC 61508 and the achieved
SIL of the designed function must be verified by the system integrator.
Eisenbau s.r.l. a socio unico
Via T.A:Edison, 16 20090 Cusago (MI) Italy
Phone: +390293562116 Fax: +390293567735
Guardbox production unit: Via XXIV Maggio, 13
25017 - Sedena di Lonato (BS)
Phone: +390309131240 Fax: +390309130946
- SIL
www.eisenbau.it
SIL-SM-GBX_EN
www.guardbox-ex.com
rev.2
1
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Table of Contents
Related Manuals for Eisenbau GuaRdboX–SIL GP Series
Summary of Contents for Eisenbau GuaRdboX–SIL GP Series
-
Page 1: Table Of Contents
The Limit Switch Box is intended to be a part of a Safety Instrumented System as defined per IEC 61508 and the achieved SIL of the designed function must be verified by the system integrator. Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy... -
Page 2: Configuration Of The Product
VALVE OPEN VALVE CLOSED Figure 1. Limit switch box installation on actuator and valve represented in open and closed position Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 –... - Page 3 Figure 7: Configuration with N°2 Electromechanical SPDT switches Electromechanical DPDT switches Proxy magnetic switches Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 – Sedena di Lonato (BS) Phone: +390309131240 Fax: +390309130946 www.guardbox-ex.com...
- Page 4 This option only applies to dry contacts and in particular for Eisenbau to its types ES, ED (Electromechanical SDPT and DPDT), MS and MD (Magnetic proximity SPDT and DPDT).
- Page 5 Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy...
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Page 6: Constraints Of Use
-60 and +105°C are available on request. For temperature limits of sensors, reference is made to the values declared by manufacturer on the component datasheet, except for the P+F models NJ4-12GK-SN and SJ3,5-SN (corresponding to Eisenbau code PN54 and PN57), whose correct functionality down to -50°C has been tested and validated during SIL certification process. - Page 7 For the specific case of Pepperl+Fuchs proximity switch models SJ-3.5-SN and NJ4-12GK-SN, switch’s lower temperature working limit has been improved by Eisenbau and assessed by TÜV InterCert from -40 °C (P+F declared value) down to -50 °C performing the following tests: 1000000 cycling test at -50 °C checking the functionality during the test...
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Page 8: Failure Modes And Estimated Failure Rates
Performing of cycling test at low and high temperature § Evaluation of field feedback Eisenbau has an effective system to manage field feedbacks, including failure and root cause analysis. REMARKS: · The “line-monitoring” option is included in every limit switch boxes series, limited to switch option ES, ED, MS and MD. -
Page 9: Periodic Tests
Use the device according to the instructions of use and this Safety Manual · Use the device in the appropriate environment Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 –... -
Page 10: Troubleshooting
Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 – Sedena di Lonato (BS) Phone: +390309131240 Fax: +390309130946 www.guardbox-ex.com... -
Page 11: Certificate Of Conformity
SIL-SM-GBX_EN rev.2 Safety Manual for limit switch boxes series GP, GI and GD 12 Certificate of conformity Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 –... - Page 12 GuaRdboX SIL-SM-GBX_EN rev.2 Safety Manual for limit switch boxes series GP, GI and GD Eisenbau s.r.l. a socio unico Via T.A:Edison, 16 20090 Cusago (MI) Italy Phone: +390293562116 Fax: +390293567735 Guardbox production unit: Via XXIV Maggio, 13 25017 – Sedena di Lonato (BS) Phone: +390309131240 Fax: +390309130946 www.guardbox-ex.com...
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