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CONTENTS
PAGE
1 INTRODUCTION ........................................................................................................................... 1
2 INTRINSIC SAFETY REQUIREMENTS FOR EARTHING AND BONDING ............................................... 2
3 CERTIFICATION OF SURGE SUPPRESSORS ...................................................................................... 2
4 PROTECTION OF THE SENSOR AND TRANSMITTER ........................................................................ 3
5 PROTECTION OF THE GALVANIC ISOLATOR AND SAFE-AREA EQUIPMENT ....................................... 3
6 PROTECTION OF SUPPLIES AND SIGNALS FROM EXTERNAL SOURCES ............................................ 4
7 CONCLUSION ............................................................................................................................. 5
APPENDIX A .......................................................................................................................................... 5
APPENDIX B........................................................................................................................................... 5
Application Notes from Telematic
Telematic publish an increasing number of Application Notes providing easily understood information on various aspects of surge and
lightning protection. At the date of publication of this Application Note, the list included:–
TAN1001
Lightning surge protection for electronic equipment – a practical guide
A relatively brief and easy to understand introduction to the subject – an excellent starting point
TAN1002
Lightning and surge protection – basic principles
A more detailed account of the mechanism of lightning strikes and the measures needed to achieve an adequate level
of protection
TAN1003
Earthing guide for surge protection
A detailed analysis of the subject of earthing for surge suppression purposes, this is both an easily understood
exposition and a valuable reference document
TAN1004
Surge protection for intrinsically safe systems
A description of the best methods of combining surge suppression and intrinsically safe systems
TAN1005
Surge suppression for Zone 0 locations
A detailed analysis of this particular aspect of surge suppression in hazardous areas; complements TAN1004
TAN1006
Surge protection for weighing systems
Discusses, in some detail, the specific application of surge suppression to load-cell weighing systems
TAN1007
Surge protection for Local Area Networks
Discusses ways in which Local Area Networks can be damaged by lightning induced transients and how they can be
protected economically
About Telematic
Telematic Limited is a company with a well-established reputation for the design and manufacture of surge protection devices and with
considerable experience of successful installation practices. A consultancy service is available to advise customers on the selection and
location of devices for particular applications. If you have any specific enquiries, please contact Telematic directly at the address on the
back cover or contact your local MTL group company – whichever is most convenient.
Telematic is a member of the MTL Instruments group and is therefore in a unique position to make good use of Measurement Technology’s
leading position as a supplier of intrinsically safe interfaces to provide the best possible choices of equipment for hazardous-area applications.
The principal author of this publication is LC Towle, BSc, Chairman at Telematic Ltd, who acknowledges with thanks the comments of
colleagues and customers. If you have any comments (preferably constructive) on this document, please make them to the author so that the
document can be amended and made even more useful.