MTL Instruments TP48, TP32, TP24-7, SLP Operating Manual
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SAFETY MANUAL
Instrument Signal Connections
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Surge Protection Devices
SD Series, SD07/16/32/55 all versions and SDRTD, SD150X, SD275X.
SLP07D, SLP16D, SLP32D. IOP Series, all versions. TP Series, TP24/7, TP-32, TP-48.
IEC 61508:2010
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IEC 61508:2010
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IEC 61508:2010
FUNCTIONAL SAFETY MANAGEMENT
These products are able to be used within a Safety
System conforming to the requirements of IEC
61508:2010 or IEC 61511. The products are not Safety
Elements but may be used to protect instrument loops
designed to achieve Safety Integrity Level of up to SIL3.
MTL is a certified Functional Safety Management company meeting the requirements of IEC61508 Part1:2010 clause 6.
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CONTENTS
1 INTRODUCTION 3
1.1 Application and function 3
1.2 Variant Description 3
2 SYSTEM CONFIGURATION 5
2.1.1 Input/Output Characteristics 5
2.1.2 Associated System Components 5
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IEC 61508:2010
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IEC 61508:2010
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IEC 61508:2010
3 SELECTION OF PRODUCT AND IMPLICATIONS 6
4 ASSESSMENT FOR USE IN FUNCTIONAL
SAFETY APPLICATIONS 6
4.1 EMC 8
4.2 Environmental 8
5 INSTALLATION 8
6 MAINTENANCE 8
7 APPENDICES 9
This manual supports the application of the products in functional safety related loops. It must be used in
conjunction with other supporting documents to achieve correct installation, commissioning and operation.
Specifically, the data sheet, instruction manual and applicable certificates for the particular product should be
consulted, all of which are available on the MTL web site.
In the interest of further technical developments, we reserve the right to make design changes.
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1 INTRODUCTION
1.1 Application and function
The products concerned in this manual are ‘Surge Protection’ devices which can be located in safe or hazardous areas
of a process plant to guard against the direct and indirect effects of lightning, or other transient overvoltage, on the
instrumentation and power signals. They are also designed and tested according to IEC 61643-21 (Low voltage surge
protective devices) for use in signal and communication loops.
The location, or mounting, of the surge protection device is a key parameter when considering the operation of the device
and the consequences of breakdown or failure upon the operation of the signal loop to which it is connected.
The TP family of products are designed to protect field-mounted equipment, such as process measurement transmitters
for level, flow, pressure, etc, by fixing directly into the cabling conduit entries of the housing. The SD, SLP and IOP Series
are mounted on DIN rail in a cabinet or enclosure to protect the measuring and control equipment that is usually located
in a control or equipment room.
Each module provides a hybrid surge protection circuit for one or two instrument loops. The devices are passive and
consume no loop current in normal operation.
There are no configuration switches or operator controls to be set on the modules – they perform a fixed function, related
to the model selected, and can be considered as wiring components that pass the process signals without alteration.
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SURGE PROTECTORS SERIES
Note: The information given in this manual is intended to assist in the selection and application of surge protection
devices for instrumentation signals that are being used to provide functional safety according to the latest IEC 61508
and IEC 61511 standards.
Within the context of these standards the surge protection devices themselves do not perform a defined safety function
and thus a full assessment for functional safety to IEC 61508 would not be relevant. The products are regarded as wiring
components, providing connection and termination for the electrical signals, with the key concern being the reliability of
the signal transfer through the device.
See Appendix B where this position is affirmed by a notified certification body.
1.2 Variant Description
Functionally the surge protection devices are essentially the same, within a given Series, but the modules differ in the
maximum signal voltage they will conduct in normal operation.
The TP items become an integral part of the field transmitter and the SD/SLP/IOP models are selected to suit the specific
requirements for protection of one or more process loops.
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Typical internal construction of the devices is shown in the following diagrams:
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Figure 1 IOP Series surge protection arrangement, Figure 2 IOP Series surge protection arrangement, (dual channel)
(single channel)
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Figure 3 SD Series surge protection arrangement, (typical)
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Figure 4 TP Series surge protection arrangement, (Parallel)
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