Обзор

Introduction

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 Milltronics offers a choice of models to meet the specific needs of your application.

SITRANS Probe LR is a 2-wire loop powered compact radar level transmitter for level/volume monitoring of liquids and slurries in storage and simple process vessels,

SITRANS LR 200 is a 2-wire loop powered pulse radar level transmitter for liquid bulk storage or process vessels.

SITRANS LR 300 is a four-wire pulse radar level transmitter for measurement of liquds and slurries in process vessels and extreme or hazardous process conditions.

SITRANS LR 400 is a long-range FMCW radar level transmitter for solids and liquids storage. It is ideal for measuring through extreme dust or low dielectric liquids.

Auto False-Echo Suppression

SITRANS LR instruments offer the unique advantage of patented Sonic Intelligence signal processing technology. This in-depth knowledge and experience is built into the software’s advanced algorithms to provide intelligent processing of echo profiles. The result is repeatable, fast, and reliable measurement.

A special feature of SITRANS radar devices is Auto False-Echo Suppression, an echo-processing technique that automatically detects and suppresses false echoes from vessel obstructions. You can implement this feature using two parameters on the local interface or SIMATIC PDM communicating over HART or PROFIBUS PA.

Область применения

Radar Application Data Sheet

Способ действия

Principle of Operation

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 Milltronics offers pulse radar transmitters (SITRANS Probe LR, SITRANS LR 200, SITRANS LR 300) and an FMCW (Frequency Modulated Continuous Wave) radar transmitter (SITRANS LR 400).

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.

Radar operation

Технические данные

Radar Selection Guide

 Handheld Programmer Selection Guide