A safety instrumented system uses sensors to monitor and remediate equipment. It is generally safer than relying on humans, but can be expensive. Experienced professionals are needed to read SIS values as sensors may not detect all risks.
A safety instrumented system is a system in which the system, or its equipment, is monitored and remediated based on the use of monitors and sensors. When the sensors in a safety instrumented system detect something wrong with the equipment, the equipment is usually fixed right away or taken out of service until it can be repaired. While this approach is highly accurate and generally safe, monitoring equipment can be expensive. People who have experience with a particular machine tend to run SIS sensors, because the sensors may not detect everything.
When a safety instrumented system method is used, there must be many sensors and equipment to control a machine. These sensors can determine many different details about the car and largely depend on what the car itself can do. For example, these sensors can determine how much power a car is generating, its airflow, and software integrity, among other things. Each machine will have different acceptable safety limits, and when these limits are violated, it is normally best not to use the machine.
After the Safety Instrumented System’s sensors detect a problem that puts the machine and its operators at risk, the machine is usually repaired immediately. These problems are not normally immediate risks and it may be possible to continue using the machine for a little longer, but this increases the safety risk and is considered irresponsible. If the machine cannot be repaired immediately, whether due to lack of workers or parts, it will normally be put out of service until repairs have been made.
The safety instrumented system approach is generally safer than simply trusting humans to check for errors, but one problem with SIS adoption is the use of expensive sensors. These sensors are essential to SIS, but cost so much, as of 2011, that many small businesses cannot afford them. At the same time, they tend to reduce costs after installation, usually because fewer routine repairs are required.
While anyone can be used to read SIS values, this task is normally only assigned to experienced professionals who understand how the machine works. This is because, while SIS sensors can determine almost any security risk, they are not always 100% accurate and there is a possibility that there is a security risk that the sensors cannot determine. Because of this, the human operator and the sensors work together to determine the risk and when repairs are needed.
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