About Us

The Functional Safety SIG (FS-SIG) is a special interest group within the Institute responsible for promoting the awareness and understanding of safety-related topics associated with measurement and control.  The FS-SIG is the body that represents the Institute in reviewing any safety-related submissions that it receives.

The FS-SIG Executive Committee organises conferences, workshops and seminars and we publish articles in the Institute’s journals together with issuing FS-SIG Briefing Notes. We invite or co-opt our membership from a wide spectrum of end users, regulators, vendors, contractors and consultants, so that we may represent a broad range of interests in safety-related matters.  Many FS-SIG Executive members also belong to other professional bodies and this promotes an exchange of views and information throughout the discipline.

Our main focus is the safety-related UK and European Regulations, in particular, IEC 61508 and the associated sector-specific standards.  All of these areas continue to develop and represent significant challenges for guidance and understanding.

We often review and comment on draft HSE and other publications and welcome this opportunity to add value.

InstMC members can join the FS-SIG by Clicking 'MyInstMC' on the InstMC homepage and login to your account. Select 'Manage Personal Details' and under Special Interest Groups, click the 'Edit Special Interest Groups' button. Click 'Join' Functional Safety to become a member.

You can get in touch with the FS-SIG by writing to Functional Safety SIG Chairman c/o the Institute, or by contacting us by email at.

Registered Functional Safety Engineer

If you are an experienced engineer working in the functional safety discipline, the InstMC Registered Functional Safety Engineer qualification could be the right choice for you. 

For more details click here!

To view the register of InstMC Registered Functional Safety Engineers click here!

Technical and Briefing Notes

The FS-SIG promotes Functional Safety articles and training in a variety of ways:

  • Seminars and Workshops

  • Papers and articles in appropriate journals

  • FS-SIG Briefing Notes


Currently, the FS-SIG Briefing Notes are posted to the InstMC FS-SIG LinkedIn forum.

This is a private group maintained as a SIG member benefit with exclusive initial access to material published through this channel.  To be eligible to join the LinkedIn group you must first join the FS-SIG itself as detailed above.


To access the Briefing Notes on LinkedIn click here!

Briefing Notes:

SIL Certification

Human Factors & LOPA

Proof Test Principles

Proof Test Coverage


Published Articles:

Functional Safety Coming of Age – Precision 2019 Issue No. 12 – click here!






Functional Safety 2016 – Conference and Exhibition – 8th/9th November 2016

Functional Safety 2017 – Conference and Exhibition 21st/22nd November 2017 click here!

Functional Safety 2018 – “Hints, Tips & Pitfalls” – 21st November 2018

HazardEx 2020 – Workshop - 27th February 2020 - “What will be in 61511 Ed3"

Meet the SIG's - 7th July 2021

FS-SIG Executive Committee

Harvey T. Dearden

Independent consulting engineer active in the process sector. Associate Engineering Director with HTS Engineering Group Ltd. Developer of SISSuite software toolset. Author of ‘Functional Safety In Practice’ and ‘Professional Engineering Practice’.

David R. Ransome

Retired consulting engineer Ex. Chairman and Director with P & I Design Ltd. Specialising in Functional Safety, previous member of many safety committees and work-groups. TuV Rheinland Functional Safety Expert and Registered Functional Safety Engineer.

Coin Easton

Independant Safety Consultant in the process and machinery sector. TuV Rheinland Senior Functional Safety Expert and CASS Registered Functional Safety Assessor at Prosalus Limited.

Steve Kriescher

An experienced instrument engineer specialising in functional safety in the process industry sector. Engineering Director at ICS Ltd.

David Green

Chartered Engineer with extensive on-site engineering experience in upper tier COMAH facilities, for more than 20 years. A qualified Funtional Safety & Machinery Safety Engineer with cross industry, full safety lifecycle experience in on-site and consultancy roles. Represents the InstMC on the Machinery Safety BSi committee MCE/3.