Float Level Switches Certified for Safety Instrumented Systems

April 4, 2012
Emerson Process Management announces that selected models of its Mobrey Horizontal Magnetic Float Level Switches have been certified in accordance with IEC61508 to attain (Safety Integrity Level) SIL 1 for a single device and SIL 2 for a pair of devices.

Following successful third-party evaluation by the global organization Exida, Mobrey Horizontal Magnetic Float Level Switches have the required Failure Modes, Effects and Diagnostic Analysis (FMEDA) report. The models assessed and certified are typically used in the oil and gas, power, refining and chemical industries for high and low liquid level alarm, overfill alarm and pump control duties.

The use of certified devices provides a measure of quality and reliability, making it much easier to design and implement a safety system in process applications that must comply with the IEC 61508/61511 functional safety standard. There are also versions with marine approvals and ATEX certifications for use in hazardous areas.
Mobrey switches provide reliable level switching in most liquids through a magnetically coupled design that enables reliable operation even when operating in extremes of pressure and temperature, according to the company. Measurements are unaffected by changes in process temperature, dielectric or the presence of vapors, and there is a wide range of flanges, floats and switching outputs to suit all types of liquid level application. A snap-action mechanism ensures a clean make or break of the switch contacts, and there is the option of a hermetically sealed switch mechanism to eliminate freezing and corrosion of contacts and all moving parts.
For more details and to download a copy of the FMEDA Report and the Functional Safety Manual which includes a list of the models covered by the certification, visit http://www.mobrey.com and click on "Safety" under Product Quick Links.

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