Sensors suit dangerous environments
An
Impress Sensors and Systems product story
Edited by the Engineeringtalk editorial team
Nov 6, 2007
Impress Sensors and Systems' temperature limiters/controllers, pressure transmitters, screw-in transmitters, submersible probes and level control switches suit hazardous area applications.
Impress Sensors and Systems is offering a range of temperature limiters/controllers, pressure transmitters, screw-in transmitters, submersible probes and level control switches, all with SIL2 (Safety Integrity Level 2) approval for hazardous environments.
The range is targeted at safety and hazardous area applications, including process manufacturers, chemicals, oil and gas, nuclear and atomic weapons establishments.
The devices are also suitable for medical device applications.
The process industry demands the highest degree of safety and reliability.
The current Safety Integrity Level (SIL) international safety standard provides suppliers and users with a common framework on which to design products and systems for safety-related applications.
The standard also provides a more scientific, numerical approach to specifying and designing safety systems, enabling the nature of the risk to be quantified.
The required safety level of a process plant is classified in accordance with the international IEC61511 standard and depends on the risk constituted by a plant.
The IEC61508 standard describes the requirements of electrical, electronic and programmable electronic devices used in such plants.
Both standards subdivide plants and devices into four safety levels, from SIL1 for low risks, to SIL4 for very high risks.
The allocation to these safety levels is based on the use of a risk graph and depends on the extent of possible damage; the frequency of persons being present in hazardous areas; the possibility of damage prevention; and the probability of an unwanted event occurring.
The standards also describe the type of risk assessment and procedures for integrating certain safety functions into sensors and plants.
Generally, the significant hazards for equipment and any associated control system have to be identified by the specifiers or developers via a hazard analysis.
The analysis identifies whether functional safety is necessary to ensure adequate protection against each significant hazard.
Examples within safety related systems for mechanical engineering include auxiliary disconnected systems; fire detector and gas warning systems; monitoring of turbines; safety interlock and auxiliary disconnected systems for machines; devices for medical applications; and remote monitoring based on network, handling and programming of procedural constructions.
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