UHZ-517C80 is a double-system level instrument combined by UHZ517 magnetic level gauge and RF2000 intelligent guided wave radar level gauge. The field level (interface) indication and measure are separated with guided wave radar remote transmitter; this structure is very suitable for the high/low/ultra-low temperature, high pressure, wide range level local indication and DCS interlocking situation. The employed guided wave radar level gauge from USA Fox Instruments is applicable for complicated and extreme service condition; the radar signal is transmitted via guided wave rod, instead of air transmission, with stable output and high accuracy. Condensate water on guided wave rod has no influence on measuring performance, dielectric constant minimum value of measured medium can up to 1.4 (butane). Boiling, fluctuation, turbulence and even blade mixer conditions can not affect the measurement. Measuring data is not affected by the change of process conditions (temperature, pressure and density etc). It can quickly track liquid level.