Ultrasonic level switch

The Echotel Model 962 Ultrasonic Level Switches by Magnetrol offers two setpoints on the same transducer, a tip sensitive lower gap and a unique flow-through upper gap. This dual-gap design allows the unit to be used for low and high level alarm, high and high/high level alarm, low and low/low level alarm, or for pump control in an auto fill/empty mode.

By using the pulsed ultrasonic wave technology, the 962 is less sensitive to buildup, aeration, foam and turbulence. Response time is less than 0.5 seconds. It features adjustable time delay (up to 45 seconds) and a test button for the output signal. Other LEDs indicate proper operation and malfunction conditions; identification of the malfunction and a separate error signal are also standard. Another major advantage is that the Model 962 is not sensitive to density or liquid change and therefore does not require any calibration. Depending on the transducer the device can be used with nearly every type of liquid (maximum viscosity of 10.000cP) in a temperature range between -80 up to 165°C and pressures ranging from vacuum up to 130 bar.

The 962 is available loop-powered with a mA output or AC/DC line-powered with integrated relays. It is designed for use in ATEX intrinsically safe as well as explosion proof areas. Its construction conforms to the Pressure Equipment Directive (PED), and, with a Safe Failure Fraction higher than 90% the Model 962 can easily be integrated in SIL 1, 2 or 3 loops.