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# Category : Safety Instrumented System (SIS)

A Safety Instrumented System (SIS) is engineered to perform “specific control functions” to failsafe or maintain safe operation of a process when unacceptable or dangerous conditions occur.

## Applying Probability Laws to a Safety Instrumented System

The relatively simple concepts of AND and OR Boolean functions become surprisingly complicated when applying them to real-life measures of component reliability, mainly because reliability is measured in multiple ways....

## Safety Instrumented System Probability

While the term “probability” may evoke images of imprecision, probability is in fact an exact mathematical concept: the ratio a specific outcome to total possible outcomes where 1 (100%) represents...

## Process Safety and Instrumentation

Here we discuss about instrumentation related to industrial process safety. Instrumentation safety may be broadly divided into two categories: how instruments themselves may pose a safety hazard (electrical signals possibly...

## SIS Example : Nuclear Reactor Controls

Nuclear fission is a process by which the nuclei of specific types of atoms (most notably uranium-235 and plutonium-239) undergo spontaneous disintegration upon the absorption of an extra neutron, with...

## SIS – Safety Instrumented System Example

A Safety instrumented system (SIS) consists of an engineered set of hardware and software controls which are especially used on critical process systems. SIS – Safety Instrumented System Example Examples...

## Functional Safety Questions & Answers

Functional Safety Questions & Answers : SIS as an “instrumented system used to implement one or more safety instrumented functions. Functional Safety Questions & Answers What is PHA ? Process...

## S84 / IEC 61511 Standard for Safety Instrumented Systems

IEC 61511 is a technical standard which sets out practices in the engineering of systems that ensure the safety of an industrial process through the use of instrumentation. Such systems...

## Difference between Availability, Reliability & SIL

We often come across the above terms, and others, when we are talking about equipment and systems. All of them relate in some way to how well something will perform...

## Safety Instrumented System Module Failure

The international standard IEC/EN 61508 has been widely accepted as the basis for the specification, design and operation of safety instrumented systems (SIS). As the basic standard, IEC/EN 61508 uses...

## Safety Instrumented System Interview Questions and Answers

Read the following Safety Instrumented System Interview Questions and Answers useful for interview preparation. Safety Instrumented Systems must be independent from all other control systems that control the same equipment in...

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