Radar measurement technology is non-contacting and low maintenance. Because microwaves require no carrier medium, they are virtually unaffected by the process atmosphere (vapour, pressure, dust, or temperature extremes). Siemens offers a choice of models to meet the specific needs of your application.
SITRANS Probe LR
SITRANS Probe LR is a 2-wire, 6 GHz pulse radar level transmitter for continuous
monitoring of liquids and slurries in storage vessels with nominal pressure and
temperature, to a range of 20 m (66 ft).
SITRANS LR200
SITRANS LR200 is a 2-wire, 6 GHz pulse radar level transmitter for continuous monitoring
of liquids and slurries in storage and process vessels including high temperature and
pressure, to a range of 20 m (66 ft).
SITRANS LR250
SITRANS LR250 is a 2-wire, 25 GHz pulse radar level transmitter for continuous monitoring
of liquids and slurries in storage and process vessels including high temperature and
pressure, to a range of 20 m (66 ft). Ideal for small vessels and low dielectric
media.
SITRANS LR260
SITRANS LR260 is a 2-wire 25 GHz pulse radar level transmitter for continuous monitoring of solids in storage vessels including extreme levels of dust and high temperatures, to a range of 30 m (98.4 ft).
SITRANS LR400
SITRANS LR400 is a 4-wire, 24 GHz FMCW radar level transmitter for continuous monitoring
of liquids and slurries in storage and process vessels including high temperature and
high pressure, to a range of 50 m (164 ft). It is ideal for low dielectric media.
SITRANS LR460
SITRANS LR460 is a 4-wire, 24 GHz FMCW radar level transmitter with extremely high signal
to noise ratio and advanced signal processing for continuous monitoring of solids up to
100 m (328 ft). It is ideal for measurement in extreme dust.
Radar measurement technology measures the time of flight from the transmitted signal to the return signal. From this time, distance measurement and level are determined.
Unlike ultrasonic measurement, radar technology does not require a carrier medium and travels at the speed of light (300 000 000 m/s). Most industrial radar devices operate from 6 to 26 GHz.
Siemens offers pulse radar transmitters (SITRANS Probe LR, SITRANS LR200, SITRANS LR250, SITRANS LR300) and FMCW (Frequency Modulated Continuous Wave) radar transmitters (SITRANS LR400, SITRANS LR460).
Pulse radar emits a microwave pulse from the antenna at a fixed repetition rate that reflects off the interface between the two materials with different dielectric constants (the atmosphere and the material being monitored). The echo is detected by a receiver and the transmit time is used to calculate level.
Reflected echoes are digitally converted to an echo profile. The profile is analyzed to determine the distance from the material surface to the reference point on the instrument.
FMCW (Frequency Modulated Continuous Wave) radar devices send microwaves to the surface of the material. The wave frequency is modulated continuously. At the same time, the receiver is also receiving continuously and the difference in frequency between the transmitter and the receiver is directly proportional to the distance to the material.
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