Low-cost transmitter

29 November 2000

Solartron claims that its MRL 700 non-contact radar level transmitter delivers precision measurement based on frequency modulated continuous wave technology for a price normally associated with pulsed-technology instruments.

A time-of-flight level transmitter, MRL700, is installed inside the process tank above the product for continuous level measurement. MRL wet side is made from 316L stainless steel with a choice of PVC or PTFE antennae for wide chemical compatibility.

Accuracy is ensured by the use of FMCW technology. A continuous high frequency signal, which ramps from 9.5 to 10.5GHz, is transmitted by the instrument and reflected back from the surface of the liquid. The difference in frequency between the received and transmitted signal is a measure of the distance travelled. FMCW produces more data and therefore a higher accuracy measurement than pulse-based devices, which use short bursts of energy at lower frequencies.

MRL is said to be accurate to +/-3mm. It can be used in temperatures from -40 to 150°C, and in pressures from full vacuum to 30bar. Its measuring range is 0- 35mm

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