Radar Level Gauge for Automatic Strorage Tank Level Measurement

Radar level gauge is a non-contact level measuring instrument with microwave technolog. No displacement and no transmission parts. Radar level gauge is the perfect choice for non-contact measurement of liquid or material storage tank. Radar level gauges with unique features are an important part of the tank monitoring and control system. Radar level gauge and ultrasonic level transmitter are similar in structure.

  • Application:Solid material, Strong dust, easy to crystallize, condensation occasion
  • Measuring Range:80 meters
  • Process Connection:Thread, Universal Flange
  • Process Temperature:-40℃~130℃(Standard type);-40℃~250℃(High temperature type)
  • Process Pressure:-0.1 ~ 0.3 MPa
  • Measurement Accuracy: ±15mm
  • Protection Grade:IP67
  • Frequency Range: 26GHz
SIRD-904 Radar Level Gauge with Parabolic Antenna

Sino-Inst offers a variety of Radar Level Gauge with Parabolic Antenna for level measurement. If you have any questions, please contact our sales engineers.

Features of SIRD-904 Radar Level Gauge with Parabolic Antenna

Radar Level Gauge with Parabolic Antenna can produce narrow beam width and directivity. When there are many interferences in the tank wall, it can be measured well. It is not affected by false echoes of interferences such as steps.

The parabolic antenna is suitable for liquid and solid applications. Because of the largest diameter, the radar beam is the narrowest and can be used for extremely long measurement distances. The parabola is also the most insensitive antenna type to pollution.

It can be used in applications where antenna condensation is severe, such as asphalt and liquid sulfur.

SIRD-904 Radar Level Gauge with Parabolic Antenna uses a transmission frequency of up to 26GHz. It has:

  • The beam angle is small (minimum 5 degrees). The energy is concentrated. It has stronger anti-interference ability. It greatly improves the measurement accuracy and reliability;
  • The antenna size is small. It is easy to install and add dust cover and other antenna protection devices;
  • The measurement blind area is smaller. Good results can also be obtained for small tank measurement;
  • The wavelength is shorter. It is more suitable for the level measurement of small particles.
  • It adopts advanced microprocessor and unique EchoDiscovery echo processing technology.
  • It adopts pulse working mode. Radar level gauge has very low transmitting power. It can be installed in various metal and non-metal containers, and it has no harm to human body and the environment.

Specifications of SIRD-904 Radar Level Gauge

Application:Solid materials, strong dust, easy to crystallize, and condensation
Measuring Range:80 meters
Process Connection:Thread, universal flange
Process  Temperature:-40~130℃(standard type) / -40~250℃(high temperature type)
Process Pressure:-0.1~0.3MPa
Accuracy:±15mm
Protection Grade:IP67
Frequency Range:26GHz
Supply:Two-wire system (DC24V) / Four-wire system (DC24V/AC220V)
Signal Output:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Outer Covering:Aluminum Single Chamber / Aluminum Dual Chamber / Plastic / Stainless Steel Single Chamber
Explosion-proof Grade:4…20mA/HART (two-wire/four-wire) / RS485 Mod bus
Antenna Materialstainless steel

Radar level gauge working principle

Radar level gauge antenna microwave pulse is narrow, the downward transmission antenna. Microwave exposure to the medium surface is reflected back again by the antenna system receives. Sends the signal to the electronic circuit automatically converted into level signals. Because the microwave propagation speed, electromagnetic wave to reach the target and the reflected back to the receiver this time is almost instantaneous.

Datum measurement:  Screw thread bottom or the sealing surface of the flange.

Note: Make sure the radar level meter the highest level cannot enter the measuring blind area (Figure D shown below).

  • A    Range set
  • B    Low adjustment
  • C    High
  • D    Blind area

Radar Level Gauge Applications

Radar liquid level can be divided according to the antenna form and can be divided into: cone antenna, parabolic antenna, rod antenna.

The cone antenna is suitable for installation on the top of the tank or on the still-pipe. Suitable for applications with large measuring range.

The parabolic antenna is suitable for both liquid and solid measurement applications. Because it has the largest diameter, it has the narrowest radar beam.

The parabolic antenna is also the antenna type that is least sensitive to pollution. Which can be used for extremely long-distance measurement . It can be used in applications with harsh antenna bonding fluids such as asphalt and liquid sulfur.

The rod antenna is small in size, and only the PTFE material is exposed to the atmosphere of the storage tank. Rod antennas are suitable for measurement applications with sanitary requirements or corrosive chemical materials.

For the measurement-level high-precision radar level gauge, the frequency modulated continuous wave type is adopted. Except for fuel oil, asphalt and other storage tanks with high viscosity and easy condensation. Which use parabolic antennas, other storage tanks use cone antennas.

The inner floating roof tank is designed with a wave guide to achieve accurate measurement of the liquid level of the storage tank. And set up a local indicator on the ground to display the liquid level value. It is convenient for on-site operators to inspect.

Radar Tank Gauging System

Liquid level measurement system based on fieldbus of radar level gauge.

The radar level gauge provides 4-20mA output signal superimposed with HART, and also provides a digital field bus transmission method.

In the tank area measurement system, the tank area measurement signal is transmitted to the control system through the field bus of the radar level gauge.

The field bus can transmit multiple process parameters at the same time, which greatly simplifies the connection line and reduces the cost.

And at the same time of the transmission process, the identifier of the instrument and simple diagnostic information can also be transmitted together.

The field bus is bidirectional, so it is possible to calibrate, adjust and operate the field intelligent instrument in the control room. It can even predict the failure before it occurs.

Using the characteristics of data transmission based on the fieldbus of the radar level gauge, a level measurement system is constructed for the tank farm.

A radar level gauge is used for level measurement.
It communicates with the radar communication unit installed in the control room through the field bus.

Then the radar communication unit communicates with the control system through the RS-485 bus. While transmitting the liquid level of each storage tank, the temperature, pressure, density and other detection signals are accurately transmitted to the control system through the radar level gauge for concentration. Monitoring.

Realize the measurement of the entire tank area.

The fieldbus transmission mode of radar level gauge has the following advantages in project implementation:

  1. The use of fieldbus network. It solves the problem of centralized detection of distributed oil storage tanks. It is convenient for networked management. It makes the system more practical, stable and reliable.
  2. Digital transmission method. It can transmit multiple process variables at the same time. It greatly simplifies the signal connection line. It saves a lot of cables, protective sleeves, trough boxes, bridges and threading boxes and other corresponding auxiliary materials. It greatly reduces the cost .
  3. The wiring is simple. If you need to add field instruments, you only need to connect to the original network in parallel. There is no need to lay it in the cabinet room. It saves cables and reduces investment. It also reduces the workload of design and installation.
  4. Project implementation is more convenient. The project period is short. The workload is greatly reduced. The maintenance and installation costs are reduced.

Radar level measurement

Radar level measurement refers to the operation method of using radar as the core technology to measure the liquid level value.

Radar level measurement is a radar level gauge based on the principle of time domain reflection (TDR).
The electromagnetic pulse of the radar level gauge propagates along the steel cable or probe at the speed of light.

When encountering the surface of the measured medium. Part of the pulse of the radar level gauge is reflected to form an echo and returns to the pulse transmitter along the same path.

The distance between the transmitting device and the surface of the measured medium is proportional to the propagation time of the pulse between them. The height of the liquid level is calculated.

Regarding the price of radar level gauge. Everyone must first know that the price of radar level gauges is generally high. At least under the same measurement parameters. Radar level gauges are more expensive than ultrasonic level transmitters.

However, the price of the radar level gauge is also telling the user its value. After all, you get what you pay for.

Of course. As a manufacturer of radar level gauges. Sino-Inst is committed to providing you with the best price radar level gauge.

Here, we provide you with a price list of radar level gauges. for reference only.

If you need to purchase radar level gauges, please contact our sales engineers to confirm the price.

Radar level gauge price list
ModelUnit price (USD/pc)Medium
Radar level gauge1038 Liquid, gas
Radar level gauge1292 Liquid, solid
Radar level gauge1292 Liquid, solid
Guided wave radar level gauge923 Liquid, gas
High frequency radar level meter1385 Liquid, solid
Guided wave radar level gauge831 Liquid, solid
Anticorrosion radar level gauge1038 Liquid, gas
Rod radar level gauge923 Liquid, solid
Rod guided wave radar level gauge831 Liquid, solid
Cable guided wave radar level gauge831 Liquid, solid

Difference 1. The measuring range is different

Ultrasonic liquid level measurement range: 0-50 meters;

The radar level gauge can measure all media with a dielectric constant >1.2 in vacuum. The measuring range can reach 70 meters.

Difference 2: Different emission materials

The ultrasonic level gauge emits sound waves from the sensor (transducer). After being reflected by the liquid surface, it is received by the same sensor or ultrasonic receiver;

Very short microwave pulses with very low energy emitted by the radar level gauge are transmitted and received through the antenna system. Radar waves travel at the speed of light.

Parabolic antenna

The parabolic antenna is suitable for both liquid and solid applications. As it has the largest diameter it has the most narrow radar beam and can be used for extremely long measuring distances. The parabolic is also the antenna type most insensitive to contamination. It can be used in applications with severe antenna condensation like asphalt and liquid sulphur.

The Rosemount 5900S antennas have a drip-off design which for some versions also include inclined polished PTFE surfaces. Condensation on the antenna is minimized, and the radar signal remains strong. This results in maintenance free operation, high accuracy and reliability.

There is always a suitable antenna for every tank type, tank opening and application:

  • Parabolic
  • Horn
  • Still-pipe array
  • LPG/LNG

Information Sources: https://www.emerson.com/documents/automation/product-data-sheet-rosemount-5900s-radar-level-gauge-en-104522.pdf

SIRD-904 Radar Level Gauge with Parabolic Antenna is a cheap alternative to Rosemount 5900S. If you have any technical questions, please contact our sales engineers.

Radar Antenna Types, please refer to:

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FAQ

How a radar level gauge works?

The radar level gauge antenna emits narrow microwave pulses. Downward transmission via the antenna. After the microwave touches the surface of the measured medium, it is reflected back and received by the antenna system again. The signal transmitted to the electronic circuit is automatically converted into a level signal. Because microwaves travel so fast, the time it takes for electromagnetic waves to reach the target and return to the receiver by reflection is almost instantaneous.

How do you calibrate radar type level transmitter?

Set up the guided wave radar level transmitter,
HART communicator, power supply,
and the multimeter as below (see below calibration setup Diagram).
Check the configuration of the lower range value (0% level, 4 mA) and high range value (100% level, 20 mA). Make sure that the inputted data is as per the datasheet.
For example, the lower range value is 10 inch and the high range value is 35 inch (both of it are measured from the bottom of level transmitter probe)
Fill the level transmitter chamber with water up to the 0% level. Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 0% level through HART communicator.
Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 4 mA.
Fill the level transmitter chamber with water up to the 100% level. Read the level measurement in the transmitter LCD (or in the HART communicator). Set this condition as 100% level through HART communicator.
Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on the multimeter) is 20 mA.

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