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Emerson awarded overfill protection status for its Mobrey Squing 2 vibrating short-fork level sensor

23 May 2006

Emerson Process Management has announced that its Mobrey Squing 2 level sensor has been issued overfill protection by the Federal Institute for Construction Technology (DIBt). The popular vibrating short-fork sensor, which gives reliable point level measurement, now meets the overfill protection requirements of the German WHG Institute concerning water protection laws. As a result it is authorised for use in tanks in applications such as chemical, petrochemical and pharmaceutical where overflow presents a risk of harm to the environment and contamination to the water supply.

Using piezo-crystal technology, Squing 2 is designed to resonate constantly at its natural frequency. When the fork comes in to contact with a liquid, the natural frequency is dampened, changing the electrical output signal. An alarm is then raised to the operator who can take the appropriate action.

“The demand for this approval originated in Germany, where it is a legal requirement to use accredited equipment,” says Kevin Cullen, product manager, Mobrey Measurement. “However, we are starting to see a demand from customers operating in other European countries. The approval process required an inspector to visit our facility in Slough and witness our in-house testing. We passed first time which confirms our testing and reliability is to the highest quality.”

The Mobrey sensor is available with a choice of threads and flanges, and features a visible heart-beat LED which flashes continuously to give perpetual indication of state, and constant confirmation that the sensor is operational. Warnings of a fault within the sensor or its circuitry are indicated by a change in flash rate. An LED off state indicates a power supply or similar fault. Also incorporated into the design is a magnetic test point to allow quick checking of the switch and associated system.

It is suitable for any liquid with a specific gravity less than 2.0 (approx 2000 kg/m3) and a viscosity up to 10000 centiPoise, and it can operate in temperatures up to 150C, and in pressures between vacuum and 100 bar. The forks extend only 50mm to allow easy installation into a tank or a pipe. Squing 2 is available as an intrinsically safe option, has no moving parts, and requires no maintenance.

Squing 2 is available in a plastic or stainless steel housing for resistance to corrosion and chemical attack for level measurement in aggressive chemical and petrochemical environments. The stainless steel housing is ATEX Flameproof, FM Explosion-proof and safe area approved, and the Hastelloy sensor is ideal for detection of hostile liquids such as bleaches, chlorines, acids, fluorides and fuel oils.

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