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June 1, 2001

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Continuous-Level Radar Transmitter Uses Twinaxial Probe

June, 2001

Materials Handling:

Continuous-Level Radar Transmitter Uses Twinaxial Probe

0601pn-4.jpgBindicator's newRadar Pulse Tracker is a continuous-level radar transmitter suitable for levelmeasurement in solids, powders and liquids. It uses twinaxial transmission andvariable gain amplification, which is said to increase signal-to-noise ratio andcompensate for loss in signal strength.

This results in 'superior' sensitivity and increased reliability in levelmeasurement of materials with low dielectric constants of 1.5 at distances up to60 ft.

The company says the twinaxial probe is better than a single-conductor probe inthat a significant amount of electrical noise is picked up by thesingle-conductor probe and transmitted to system electronics along with thereflected pulse energy. This problem can be particularly acute when the materiallevel is at the far end of the transmission line probe, at which losses of thetransmitted and reflected signals can be significant as compared with theamplitude of the noise signals.

With the twinaxial probe, the pulse is transmitted down each conductor so anynoise picked up by the probe conductors will be equal at the input to thedifferential amplifier and can be cancelled by subtraction of one input from theother. And the use of the variable gain amplifier helps compensate for the lossin signal strength due to increasing distance between the electronics and thematerial surface.

When the microprocessor-based timing circuit is monitoring sections for thetwinaxial probe near the top of the vessel, gain of the amplifier is relativelylow. When portions of the probe near the bottom of the vessel are beingmonitored, the gain of the amplifier is relatively high.

Bindicator has priced these probes between $1300 and $2500 depending on length.

Bindicator Level Instrumentation
Spartanburg, SC Circle 101

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