TDR, also known as guided Microwave or guided Radar) and offers an excellent alternative to conventional level measurements. The NGM enables precise and reliable continuous level measurement and point level detection in almost all liquids and bulk materials. This innovative device has almost no installation restrictions - it can be mounted in small tanks, tall and narrow nozzles and it measures precisely even with difficult tank geometries or close to interfering structures.
NGM uses TDR Technology: low-energy, high frequency electromagnetic impulses, generated by the sensor´s circuitry, are propagated along the probe which is immersed in the liquid to be measured. When these impulses hit the surface of the liquid, part of the impulse energy is reflected back up the probe to the circuitry which then calculates the fluid level from the time difference between the impulses sent and the impulses reflected. The sensor can output the analysed level as a continuous measurement reading through its analogue output, or it can convert the values into a freely adjustable switching output signal.
The NGM is a 4-wire unit with sufficient power to measure evidently fast and reliable. The NGM measures up to 70 times per second, a 2- wire unit in contrast only once a second. This means, that the NGM generates many folds more measuring data each second, which can then be used for a reliable evaluation of level signal. The NGM offers a standard reaction time of 0,5s and can detect level changes of up to 1000 mm/s without any problems.
NGM is suitable for a variety of level measurement applications including those that involve:
- Unstable process conditions - Changes in viscosity, density, or acidity do not affect accuracy.
- Agitated surfaces - Boiling surfaces, dust, foam, and vapour do not affect device performance. TDR
also works with recirculating fluids, propeller mixers, and aeration tanks.
- High temperatures and pressures - NGM performs well in temperatures up to +250 °C and can
withstand pressures up to 40 bar.
- Fine powders and sticky fluids - NGM works with vacuum tanks filled with used cooking oil as well
as tanks holding paint, latex, animal fat, soybean oil, sawdust, carbon black, titanium tetrachloride,
slat, and grain.
- Hazardous area ATEX cerification (in preparation)
- Factory settings may be configured via HART® Modem
