Level Measurement & Control


Loop-powered guided wave radar measures interface and level

April 2003 Level Measurement & Control

The Eclipse 707 is the first 'radar type' level measurement that is able to measure both the upper liquid level and the liquid-liquid level interface over a 2-wire loop powered connection.

Hydrocarbon condensate/water interfaces are typical applications for this user-friendly transmitter with no moving parts.

The 707 uses TDR (time domain reflectometry) technology, sending high frequency pulses down a wave-guide antenna (GWR probe). When the pulse reaches a liquid surface, part of the signal is reflected and level is accurately determined by means of a high-speed timing circuit. The remaining energy continues travelling down the probe until it reaches a higher dielectric liquid. This pulse will once more be reflected and measured by the timing circuit. By measuring the time of both reflections and the compensation of the speed of travel through the upper liquid layer, both upper liquid level and the liquid-liquid interface level can be accurately determined.

The device delivers a 4 to 20 mA output (per Namur NE 43) for the liquid interface level and via Hart a digital signal for both levels. Via a Hart module interface the unit can deliver multiple 4 to 20 mA and relays outputs.

Those familiar with the 705 series will find the same menu structure is used in the 707. This makes the new device user-friendly, even with a much more complex measuring algorithm.

With interface capability on board, Eclipse is now able to service a wide range of applications in the industry. These may range from high viscosity up to 10 000 cP, temperature up to 400°C, saturated steam applications up to 11 MPa boilers, high pressure up to 34,5 MPa, liquefied gases down to Er of 1,4 as well as extremely aggressive or ultra clean applications.

For more information contact NIC Instruments and Engineering, 011 786 3700, john@nicinst.co.za, www.nicinst.co.za





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