FMCW radar level

The Pegasus range of two-wire, loop-powered, non-contact level transmitters from Solartron Mobrey brings the advanced technique of frequency modulated continuous wave (FMCW) radar to a wider process market.

Available with both rod and horn antennae to suit a wide range of applications, Pegasus has an operating range of 30m and is supplied in intrinsically safe (IS) and explosion-proof designs as standard.

Taking its 24V dc power off a standard two-wire twisted pair loop, the 4-20mA Hart compatible transmitter can be controlled from anywhere on the loop.

Data can be accessed through a PC, a Palm PDA or a series of wall and panel mounted units.

Unlike pulsed radar transmitters, the FMCW antenna emits a continuous linear microwave signal that is closely controlled to ramp between 5.55GHz and 6.40GHz over a fixed time period, towards a liquid level surface below.

Instead of time-of-flight measurements, the instrument monitors the difference in frequency between transmit and echo signals, which gives a measurement of the distance to the surface of the liquid.