Continuous Level Measurement

The TDR-3000 provides continuous, non-mechanical level measurement, utilizing guided wave radar technology. The TDR-3000 is particularly suited for measuring the level of solids, granules, and powders, as well as a wide range of liquids. For many applications, the TDR-3000 is an economical and superior alternative to capacitance, ultrasonic, and plumb bob technologies.

The TDR-3000 two-wire guided microwave level transmitter uses the TDR (Time Domain Reflectometry) principle. The instrument sends low power nanosecond-wide pulses along an electrically conductive rod, cable, or coaxial probe with a known propagation speed (the speed of light). As the pulse reaches the surface of the medium (altered dielectric constant Ԑr), a part of it is reflected back to the electronic module. The efficiency of the reflected signal depends on the dielectric constant (Ԑr) difference of the mediums. The reflected pulse is detected as an electrical voltage signal and is then processed by the electronics. Level distance is directly proportional to the flight time of the pulse. The measured level data is converted to 4-20 mA current and HART signals and is displayed on the LCD display. From the level data, further derived measuring values can be calculated such as volume and mass. The TDR-3000 is unaffected by the other properties of the medium as well as that of the space above it.

Specification Sheets:

Technical Specification

Operating Power24 VDC (18 to 36 VDC)
Process Temperature-22° to 194° F (-30° to 90° C)
Operating Pressure-14 to 232 psi
AccuracyCable length < 33 ft. (10 m); accuracy is ± 0.75” (20 mm) Accuracy: Cable length > 33 ft. (10 m); accuracy is ± 0.20% of length Dielectric Constant: > 2.1
Output4-20mA, HART® Communication
Flexible ProbeMax of 98.5 ft (30 m)
Process Connection1½” NPT
Probe MaterialsFlexible 316 SS Cable

Product Details


The TDR-3000 guided wave radar can be used in almost any material or environment. It is insensitive to changes in the material, such as the dielectric constant, and any changes to the vessel such as humidity, temperature or turbulence.


This bin level sensor can be installed in new or existing vessels easily. It can even be installed while a tank is in service so there is no additional cost or hassle associated with emptying and filling the tank. The level switch is programmed at the factory to meet the tank's specific measurements.

Technology: Guided Wave Radar
Applications: Measures bulk solids or liquids, radar signal is guided along steel cable


Specification Sheets: