Radar Level Meter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction Features Specifications Model Selection Application Installation

Introduction

80GHz FMCW radar products (also known as millimeter wave radar), because it uses the millimeter wave band with a higher frequency than Ku-band radar, has important applications in remote target detection, strong smoke and dust environment, remote imaging, multi-spectral imaging, etc., and can detect smaller targets than microwave radar and achieve more accurate positioning. With higher resolution and greater confidentiality.

What is millimeter wave electromagnetic wave: Usually 30-300GHz frequency domain (wavelength of 1~10 mm) electromagnetic wave called millimeter wave, it is located in the wavelength range of microwave and far infrared wave overlapping, thus both the characteristics of two wave spectra.

It is also possible to study the composition of substances or to conduct quality control by analyzing their characteristic spectra.

As an 80GHz band radar for industrial measurement, it has high precision, non-contact level and liquid level measurement, and has incomparable advantages over other ordinary microwave pulse radars and guided wave radars. With extremely narrow beam and penetration capability, it can adapt to ultra-complex working conditions without weakening the measurement performance.

Features

1.Small antenna size,easy for installation;

2.Non-contact level measurement, no wearing,no pollution.

3.Medium with bubble/corrosive/steam,all work well.

4.The shorter wavelength,the better reflection of solid surface inclination.

5.Small beam angle,makes energy concentrated,enhances the echo ability,avoid interference.

6.High signal-to-noise ratio,the level fluctuation state can obtain better performance.

7.High frequency,the best choice of solid & low dielectric constant measurement.

Specifications

Frequency	76GHz ~ 81GHz, 5GHz FMCW bandwidth
Measuring range	x0: 0.3 m ~ 60m x1: 0.08m~30m x2: 0.6m ~ 120m
Measurement accuracy	±1mm
Beam angle	3°/6°
Minimum measured dielectric constant	>=2
Power	15~28VDC
Communication	2x: MODBUS 3x: HART/Series
Signal output	2x: 4 ~ 20mA or RS-485 3x: 4~20mA
Fault output	3.8mA, 4mA, 20mA, 21mA, hold
Field operation / programming	128 × 64 dot matrix display / 4 buttons PC software Bluetooth
humidity	≤95%RH
Enclosure	Aluminum alloy, stainless steel
Antenna type	Lens antenna/anti-corrosive antenna / flange isolated by quartz
Process temperature	T0:-40~85ºC; T1:-40~200ºC; T2:-40~500ºC; T3:-40~1000ºC
Process pressure	-0.1~2MPa
Product Size	Ø100*270mm
Cable entry	M20*1.5
Recommended cables	AWG18 or 0.75mm²
Protection class	IP67
Explosion-proof grade	ExdiaIICT6
Installation method	Thread or flange

Model Selection

01 Measure the medium, temperature, whether there is corrosion

02 Process pressure range

03 Measuring range

04 Working power supply

05 Signal output, communication

06 Whether to explosion-proof

07 Installation mode

08 Precision class

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

Installation Requirement

1. Installed at 1/4 or 1/6 of the diameter away from tank wall.

2. The top plane of the conical tank can be installed in the middle of the tank top, It is guaranteed to measure to the bottom of the cone.

3. When there is a stock in tank, the antenna should be vertically aligned with the material surface. If the material level is uneven, level meter installation direction must be adjusted by universal flange. The angle of the horn makes the horn aim at hte material surface as much as possible. (Because the inclined solid surface will cause echo attention, Even the problem of signal loss)

4. Stir
When there is stirring in the tank, keep the meter away from the stirrer if necessary. After installation, "false echo learning" should be carried out under agitation, In order to aliminate the false echo effect generated by the stirring, the installation should use wave guide pipe.

5. False echo storage
When there is a stirring blade in the tank that interferes with the radar measurement, if the stirring blade cannot be avoided, a false return is required. Wave storage eliminates interference signals generated by false waves. If you want to get the normal level echo, the false echo storage can store the echo signal between the envelope curve in the figure below, the storage is defined as a false signal, and a normal livel echo signal isn obtained.

6. Guide wave pipe installation
Use guide wave pipe installation (guide wave pipe or by-pass pipe), can avoid obstacles and foam influence. Due to feeding, mixing or other process handlings in container, it will generate foam on the surface so signal will be attenuate. If bubbles caused measurement errors, should install the sensor in the guide wave pipe, oruse guided wave radar level meter. Measurement inside the guide wave pipe, the guide wave minimum diameter is 50mm. In the connection guide wave pipe, should avoid big cracks and welding. In addition, carry out "virtual False echo learning".

7. Design requirement for guide wave pipe

1)Metal material, smooth inside the tube;

2)Preferably stretched or longitudinal welded stainless steel pipe;

3)The weld must be as flat as possible and coaxial with the hole;

4)While using pre-welded flanges or extending the sleeves and using a ball valve, the transition pipe must be aligned on the inside and fix after accurate matching;

5)The gap on the transition pipe is <=0.1mm;

6)Do not weld along the pipe wall. The inner wall of the guide wave pipe must remain flat and smooth. If user accidentally weld the inside, you should remove the uneven places and weld bead. Otherwise it will cause serious interference echo, so as to bring convenience to the attachment of the medium;

7)Guide wave pipe must reach at least the desired minimum filling height because the measurement can only be carried out in the tube;

8)Aperture <= 5mm, any number single side or full pass;

9)The antenna diameter of the sensor should be as consistent as possible with the inner diameter of the pipe;

10)The diameter should be consistent thoughout the length;

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