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 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, and are ideal 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. Mobrey Horizontal Magnetic Float Level Switches provide robust and reliable level switching in most liquids. The magnetically coupled design enables reliable operation even when operating in extremes of pressure and temperature. 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.
There are no glands or linkages that could cause leaks, or springs that require maintenance. The 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. Other options include versions with marine approvals and ATEX certifications for use in hazardous areas.