345 datasheet(3/8 Pages) MAGNETROL

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more dense, resulting in slower sound velocity. Since

measurement is directly dependent on sound speed, it is

necessary to compensate for temperature changes. All

Magnetrol’s transducers include a temperature compensa-

tion circuit which continuously monitors the temperature

at the sensor and compensates for variations over the full

temperature range of the transducer.

Ultrasonic non-contact devices are typically rated for

a maximum range in ideal conditions. But process condi-

tions can impact the maximum range of measurement.

These conditions include surface agitation, vapors and

steam, foam and air movement. A derating multiplier can

be computed to yield a new maximum range for optimum

performance. A lower frequency transducer, such as the

38 kHz model, provides increased power with a longer

wavelength to increase measurement range and improve

performance where steam, vapors or turbulence may be

present.

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The advantages of non-contact sensing are:

• No contact with corrosive, contaminating liquids.

• Accurate to within 0.25% of measured span.

• Continuous and multiple-point sensing available.

• No moving parts for reduced maintenance.

• Not affected by changes in liquid properties such as

specific gravity, dielectric shifts, pH, etc.

• Intrinsically safe, non-incendive and explosion proof

instruments are available.

Conditions limiting ultrasound’s effectiveness include:

• Surface foam that absorbs the ultrasonic signal.

• Vapors that significantly alter the speed of sound.

• Operating pressures exceeding 50 psig (3.45 bar).

• Temperatures exceeding +200° F (+93° C).

Echotel non-contact ultrasonic transmitters have been

engineered to meet the process requirements of major

industries including: Oil & Gas, Chemicals, Food &

Beverage, Power Generation, Pulp and Paper, Water

& Wastewater, Pharmaceutical, and Petrochemical.

Real World Applications

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