Overview of the working principle of radar level gauge:

Launch-reflection-reception is the basic working principle of radar level gauges.

The antenna of the radar sensor emits an electromagnetic wave signal in the form of a beam, and the emitted wave is reflected on the surface of the measured material, and the reflected echo signal is still received by the antenna. Each point in the transmitted and reflected beams is collected using ultrasonic sampling. After the signal is processed by the intelligent processor, the distance between the medium and the probe is obtained, and the terminal display is sent for display, alarm, and operation.

The running time of the radar pulse signal from transmitting to receiving is proportional to the distance D from the probe to the surface of the medium, ie:


In the formula, the time interval from the launch to the reception of the t-pulse v-waveform propagation speed is known from the slot distance E, so the distance L of the actual material level is:


In the formula, the reference point of E is the bottom of the process connection. During the transmission time interval, the antenna system is used as a receiving device. The instrument analyzes and processes echo signals with a runtime of less than one billionth of a second, and analyzes and processes the echoes in a very short time.

Radar sensors use special time-interval adjustment techniques to amplify and locate echo signals per second and then perform analysis and processing. Therefore, the radar sensor can accurately and accurately analyze and process these amplified echo signals within 0.1 s, without spending much time analyzing the frequency.

Radar Level Meter Application:

1. Installation Notes (1) The antenna is parallel to the wall of the measurement slot, which is conducive to the microwave transmission.

(2) The installation position should be more than 30cm away from the slot wall so as not to mistake the false signal on the slot wall as an echo signal.

(3) Try to avoid interference sources such as cutting area and stirrer so that there is no fixed object in the beam range and the signal reliability is improved.

(4) The takeover diameter should be less than or equal to the shield length (100mm or 250mm).

Radar level meter features:

The biggest feature of radar level gauges is their remarkable performance under harsh conditions. Both toxic and corrosive media, as well as solid, liquid and dusty, pulpy media, can be measured. In terms of measurement, it has the following characteristics:

1. Continuous and accurate measurement due to the characteristics of electromagnetic waves, not affected by the environment. Therefore, its measurement applications are quite extensive. The probe of the radar level gauge has no contact with the surface of the medium and is a non-contact measurement. It can accurately and quickly measure different media. The probe is hardly affected by temperature, pressure, gas, etc. (only 0.018% at 500°C and 0.8% at 50bar).

2. The function of suppressing interference echoes. For example, the interference echo caused by joints in the beam range and the interference echo caused by feeding or discharging noise can be automatically suppressed by the internal fuzzy logic control.

3. Accurate and safe energy-saving Radar level gauge can be measured under vacuum and pressure, and it is accurate, safe, and reliable. It can be used without restrictions and is suitable for various occasions. The chemical and mechanical properties of materials used in radar level gauges are quite stable, and the materials can be recycled, which is highly environmentally friendly.

4, without maintenance and can be strong microwave almost no interference, and measurement media are not in direct contact, can be applied to various occasions, such as vacuum measurement, level measurement or material level measurement. Due to the use of advanced materials, it is extremely durable for extremely complex chemical and physical conditions. It can provide accurate and long-term stable analog or digital level signals.

5, easy maintenance, simple operation The radar level gauge has a fault alarm and self-diagnosis function. According to the error code indicated by the operation display module, the fault is analyzed, and the fault is determined and eliminated in time, so that the maintenance calibration is more convenient and accurate, and the normal operation of the instrument is ensured.

6, a wide range of applications, almost all the media can be measured from the shape of the tank body, the radar level gauge can be measured on the level of the spherical tank, horizontal tank, cylindrical tank, cylindrical vertebral body tank; from the tank Functionally speaking, it is possible to measure the liquid level in storage tanks, buffer tanks, microwave tubes, and bypass tubes; from the measured medium, liquids, granules, slurry, etc. can be measured.

Guiding System

Fishplate for Elevator Guide Rail,Elevator Guide Shoe,Guide Rail Joint Plate

Shanghai Mengtenali Drive Equipment Co.,Ltd , http://www.monadrive.com