Product category:
Hazardous area interfaces, Enclosures
News Release from: Impress Sensors and Systems | Subject: SIL2 approved instruments
Edited by the Processingtalk Editorial
Team on 06 November 2007
Temp, pressure and level switches + SIL2
approval
Impress Sensors and Systems is offering a range of temperature limiters/controllers, pressure transmitters, submersible probes and level control switches, with SIL2 approval for hazardous environments
The new range, supplied by Impress Sensors and Systems, a specialist manufacturer and distributor of sensors, instrumentation and complete system packages, based in Aldermaston, Berkshire - is targeted at safety and hazardous area applications, including process manufacturers, chemicals, oil and gas, nuclear power and Atomic Weapons establishments The devices are also suitable for medical device applications
This article was originally published on Processingtalk on 25 Nov 2004 at 8.00am (UK)
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DP switch, display and transmitter
The DMD 341 differential pressure device offers differential pressure measurement combined with a DP sensor, 4 digit display, up to 2 switch outputs and an analogue output
Electronic pressure switch is fully configurable
Microprocessor based switching electronics offer standard pressure switch functions plus advantages of fully programmability, options of 1 or 2 switch points with LEDs plus a 1-5V 3-wire output
The process industry demands the highest degree of safety and reliability these days.
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.
Further reading
X-act pressure transmitter will set new standards!
The x-act pressure transmitter from Impress Sensors and Systems has been designed for use in the process, food and dairy, pharmaceutical and petrochemical industries
DS400 Multifunctional pressure transmitter/display
The DS400 pressure transmitter and display incorporates an award-winning, stainless steel globe housing, 2 PNP switch contacts and is designed to be ATEX approved for use in a hazardous area!
SIL means risk reduction to a tolerable level.
The required safety level of a process plant is classified in accordance with the international IEC 61 511 standard and depends on the risk constituted by a plant.
The IEC 61 508 standard describes the requirements of electrical, electronic and programmable electronic devices used in such plants.
Both standards sub-divide plants and devices into 4 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:.
* Extent of possible damage.
* Frequency of persons present in hazardous areas.
* Possibility of damage prevention.
* 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.
For more information on the Impress Sensors range of SIL2-certified pressure, temperature and level control switches, contact the sales department at Impress Sensors and Systems or visit the website.
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