Emerson awarded overfill protection status for its
Mobrey® Squing 2 vibrating short-fork level sensor.
Level sensor now meets the overfill protection
requirements of the German WHG Institute
concerning water protection laws.
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. ³The demand for this approval originated in Germany, where
it is a legal requirement to use accredited equipment,² says Kevin
Cullen, product manager, Mobrey Measurement. ³However, 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.²

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. 

For more information on this type of product, click here...

May 2006
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