What Is Radar Type Level Transmitter?

The Radar Type Level Transmitter is a kind of instrument that measures the liquid level in the container by microwave. The Radar Type Level Transmitter provides reliable non-contact, maintenance-free continuous measurement of liquids in metal tanks or containers. Not affected by pressure, vacuum or temperature.

Excellent performance under harsh measurement conditions such as flammable, explosive, highly corrosive, high temperature, and viscous. Ideal for corrosive liquids, viscous liquids, slurries, or other applications where direct contact with the medium is not desired. Especially suitable for the measurement of large vertical tanks and spherical tanks. Low dielectric properties allow operation in liquids with a dielectric constant of 2 or greater. It can be used in almost every occasion.

Non-Contact Radar Type Level Transmitters

Features of Radar Type Level Transmitters

  1. Radar Type Level Transmitter can measure liquid and solid media. For example: crude oil, slurry, raw coal, pulverized coal, volatile liquids, etc.;
  2. Can be measured in vacuum can measure all media with a dielectric constant> 1.2. Measuring range up to 150m;
  3. The power supply and output signal pass a two-core cable (loop circuit), using 4…20mA output or digital signal output;
  4. Non-contact measurement and installation are convenient and extremely stable materials are used. It is accurate and reliable with a resolution of up to 1mm;
  5. Not affected by noise, steam, dust, vacuum and other working conditions;
  6. Not subject to changes in medium density and temperature. Process pressure can reach 400bar, medium temperature can reach -200℃ to 800℃;
  7. There are various installation methods to choose from: Top installation. Side installation. Bypass pipe installation. And waveguide installation;
  8. Debugging can be selected in many ways: Using programming module debugging , equal to an analytical processing instrument. SOFT software debugging. HART handheld programmer debugging. Debugging is convenient and fast.

Advantages of radar level measurement

  • Measurement is not affected by temperature, pressure or dust
  • User-friendly adjustment saves time
  • Non-contact, continuous level measurement over larger ranges
  • Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
  • Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
  • Simple mounting and push-button calibration

Radar Level Transmitters Specifications

– 120GHz

SeriesSI-FMF11 FMCW Radar Level Transmitter 120GHz
SI-FMF11
SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor
SI-FMF12
SI-FMF13 FMCW Radar Water Level Sensor
SI-FMF13
SI-FMF15 FMCW Radar High Temperature Level Sensor
SI-FMF15
SI-FMF21 FMCW Radar Silo Level Sensor
SI-FMF21
Applicable medium:LiquidLiquidLiquidLiquidSolid
Measuring range:0.05m~30m0.05m~35m0.1m~100m0.1m~35m0.3m~150m
Antenna:32mm lens antenna42mm lens antenna78mm lens antenna78mm lens antenna78mm lens antenna + purging (or without purging)
Accuracy:±2mm±2mm±2mm (range below 35m)
±5mm (range between 35m-100m)
±2mm±5mm
Medium temperature:-40~80℃-40~110℃-40~110℃-40~200℃-40~110℃
Medium pressure:-0.1~0.3 MPa-0.1~1.6MPa-0.1~0.3MPa-0.1~2.5MPa-0.1~0.3MPa
Signal output:Two-wire system/4…20mA/HART protocol
Four-wire system 4…20mA/ RS485 Modbus
Two-wire system/4…20mA/HART protocol
Four-wire system 4…20mA/ RS485 Modbus
Two-wire system/4…20mA/HART protocol
Four-wire system 4…20mA/ RS485 Modbus
Two-wire system/4…20mA/HART protocol
Four-wire system 4…20mA/ RS485 Modbus
Two-wire system/4…20mA/HART protocol
Four-wire system 4…20mA/ RS485 Modbus
Power supply:Two-wire system/DC24V
Four-wire system/DC12~24V
Four-wire system/AC220V
Two-wire system/DC24V
Four-wire system/DC12~24V
Four-wire system/AC220V
Two-wire system/DC24V
Four-wire system/DC12~24V
Four-wire system/AC220V
Two-wire system/DC24V
Four-wire system/DC12~24V
Four-wire system/AC220V
Two-wire system/DC24V
Four-wire system/DC12~24V
Four-wire system/AC220V
Shell:Aluminum/plastic/stainless steelAluminum/plastic/stainless steelAluminum/plastic/stainless steelAluminum /Plastic /Stainless steelAluminum/plastic/stainless steel
Process connection:G1½A / 1½NPT thread / flange ≥DN50G2A thread/flange≥DN65Flange ≥DN80Flange ≥DN80Flange ≥DN80

– 80 GHz

SeriesLM78x0LM78x1LM78x2
Applicable medium:For normal solid applicationFor liquid applicationFor large range solid application
Measuring range:0.3 m ~ 60m0.08m~30m0.6m ~ 120m
Antenna:Lens antenna/
anti-corrosive antenna /
flange isolated by quartz
Lens antenna/
anti-corrosive antenna /
flange isolated by quartz
Lens antenna/
anti-corrosive antenna /
flange isolated by quartz
Accuracy:±1mm±1mm±1mm
Medium temperature:T0:-40~85℃;
T1:-40~200℃;
T2:-40~500℃;
T3:-40~1000℃
T0:-40~85℃;
T1:-40~200℃;
T2:-40~500℃;
T3:-40~1000℃
T0:-40~85℃;
T1:-40~200℃;
T2:-40~500℃;
T3:-40~1000℃
Medium pressure:-0.1~2MPa-0.1~2MPa-0.1~2MPa
Signal output:4 ~ 20mA or RS-4854 ~ 20mA or RS-4854 ~ 20mA or RS-485
Power supply:15~28VDC15~28VDC15~28VDC
Shell:Aluminum alloy, stainless steelAluminum alloy, stainless steelAluminum alloy, stainless steel
Process connection:Thread or flangeThread or flangeThread or flange

– 26 GHz

SeriesSIRD-901 SIRD-902 SIRD-902T SIRD-903 SIRD-904 SIRD-905 SIRD-906 SIRD-908 SIRD-909
Applicable medium:All kinds of corrosive liquidSlightly corrosive liquidCorrosive liquids, vapors, volatile liquidsSolid material, Strong dust
easy to crystallize, condensation occasion
Solid material, Strong dust,
easy to crystallize, condensation occasion
Solid particles, PowderHygienic liquid storage,
Corrosive container
Rivers, Lakes, ShoalRivers, Lakes, Shoal
Measuring range:
10 meters
30 meters20 meters70 meters80 meters30 meters20 meters30 meters70 meters
Antenna:Sealing horn / PTEEHorn Antenna Φ46mm/ Horn Antenna Φ76mm /Horn Antenna Φ96mm / Special CustomInternal tapered rod antenna PVDF / 78mm
Internal tapered rod antenna PFA / 78mm
Horn Antenna Φ76mm / Φ96mm / Φ121mm/Special CustomParabolic antenna Φ196mm /Φ242mmHorn Antenna Φ76mm / Φ96mm / Φ121mm/Special CustomViton / (-40~130) ℃Horn antenna with 76mm/ 96mmHorn antenna with 76mm/ 96mm/ special custom
Accuracy:± 5mm± 3mm±3mm±15mm±15mm±15mm± 3mm± 3mm± 10mm
Medium temperature:-40℃~130℃-40℃~130℃(Standard type)
-40℃~250℃(High-temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High-temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High-temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High-temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High-temperature type)
-40℃ ~ 130℃-40℃ ~ 100℃40℃ ~ 100℃
Medium pressure:-0.1~0.3 MPa-0.1 ~ 4.0 MPa-0.1~2.0 MPa-0.1~4.0 MPa (Flat flange)
-0.1~0.3MPa (Universal flange)
-0.1 ~ 0.3 MPa-0.1 ~ 4.0 MPa (Flat flange)
-0.1 ~ 0.3 MPa (Universal Flange)
-0.1~4.0 MPaNormal-pressure Normal-pressure
Signal output:4… 20mA /HART (2-wire / 4-wire)
RS485/ Modbus
4… 20mA /HART(2-wire / 4-wire)
RS485/ Modbus
4… 20mA /HART(2-wire / 4-wire)
RS485/ Modbus
4… 20mA /HART (2-wire / 4-wire)
RS485/ Modbus
4… 20mA / HART (2-wire / 4-wire )
RS485/ Modbus
4… 20mA /HART (2-wire / 4-wire )
RS485/ Modbus
4… 20mA/HART (2-wire / 4-wire )
RS485/ Modbus
RS485 / Modbus ( 6~24V DC)
4~20mA / Hart Two-wire ( 24V DC)
RS485 / Modbus ( 6~24V DC)
4~20mA / Hart Two wire ( 24V DC)
Power supply:2-wire(DC24V)/ 4-wire(DC24V /AC220V)2-wire(DC24V)/ 4-wire(DC24V /AC220V)2-wire(DC24V)/ 4-wire(DC24V /AC220V )2-wire(DC24V)/ 4-wire(DC24V /AC220V)2-wire(DC24V)/ 4-wire(DC24V /AC220V)2-wire(DC24V)/ 4-wire(DC24V /AC220V)2-wire(DC24V)/ 4-wire(DC24V /AC220V)(6 – 24V) DC  / Four-wire
24V DC / Two wire
(6 – 24V) DC  / Four-wire
24V DC / Two wire
Shell:Aluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic /Single chamberAluminum / Plastic / Single chamber
Process connection:Thread, Flange Thread, FlangeFlangeUniversal FlangeThread, Universal FlangeThread, FlangeFlange Thread G1½ A″ /Frame /Flange Thread G1½ A″ /Frame /Flange

– 6 GHz

Series
SIRD-801
SIRD-802SIRD-803SIRD-804 SIRD-805 SIRD-806
Applicable medium:Liquid, slightly corrosive liquidLiquid, especially for corrosive liquidLiquid, especially with pressure and Volatile LiquidSolid particles or block material,
And it is not suitable for solid powder
Liquid, especially suitable for low dielectric constant, sticky, with mixing liquidSolid, especially suitable for high temperature conditions
Measuring range:20m20m35m35m20m15m
Antenna:The Rod Antenna ( PP/PTFE )The Rod Antenna (PTFE)The Horn AntennaThe Horn AntennaThe Horn AntennaThe Horn Antenna
Accuracy:±10mm± 10mm± 10mm± 20mm± 10mm± 20mm
Medium temperature:(-40 ~ 130) ℃-40℃~130℃(Standard type)
-40℃~180℃(High temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High temperature type)
-40℃~130℃(Standard type)
-40℃~250℃(High temperature type)
(-40 ~ 400) ℃
Medium pressure:(-0.1 ~ 0.3) MPa(-0.1 ~ 1.6) MPa(-0.1 ~ 4) MPa(-0.1 ~ 0.3) MPa(-0.1 ~ 4) MPa(-0.1 ~ 0.3) MPa
Signal output:(4 ~ 20) mA/HART(4 ~ 20) mA/HART(4 ~ 20) mA/HART(4 ~ 20) mA/HART(4 ~ 20) mA/HART(4 ~ 20) mA/HART
Power supply:Two-wire (DC24V)
Four-wire(DC24V / AC220V)
Two-wire (DC24V)
Four-wire(DC24V/AC220V)
Two-wire (DC24V)
Four-wire(DC24V/AC220V)
Two-wire (DC24V)
Four-wire(DC24V/AC220V)
Two-wire (DC24V)
Four-wire(DC24V/AC220V)
Two-wire (DC24V)
Four-wire(DC24V/AC220V)
Shell: Aluminum /Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steelAluminum / Plastic / Stainless steel
Process connection:Flange (optional) / ThreadWith PTFE plate flangeFlange (optional) / ThreadUniversal joint flangeFlangeFlange

Industrial applications of Radar Type Level Transmitters

Radar level sensors have a very wide range of applications. Almost all media can be measured. This is something other types of meters can only look up to.

It can measure not only spherical tanks and horizontal tanks, but also the liquid level measurement of cylindrical tanks, cylindrical cone tanks, etc.

In terms of tank function, the liquid level in storage tanks, buffer tanks, microwave tubes, and bypass pipes can be measured.

As far as the measured medium is concerned, liquid, particle, slurry, etc. can be measured.

  1. Steel industry

Production processes:
Coal coking: coal preparation bunker, coke bunker, gas tank, coal tar and crude benzene tank
Sintering plant: sintered material mixing bin, cold return ore, pelletizing bin
Ironmaking plant: ironmaking intermediate warehouse, blast furnace material level, etc.

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
Volatile crystallization of tar and crude benzene;
High temperature and dust adhesion of blast furnace material level;

Selection application:
Solid measurement is mainly based on high-frequency pulse radar level meter.
Guided wave radar level meter can be used for crude benzene and coal tar.

  1. Coal industry

Production link: raw coal bunker, pulverized coal bunker, coal gangue storage level, coal washing pool.
Working condition characteristics: typical solid material measurement, strong dust, low dielectric constant. Long range.
Selection and application: high-frequency pulse radar level meter is mainly used.

  1. Cement industry

Production link: raw material warehouse, raw material homogenization warehouse, clinker warehouse, finished product warehouse, fly ash warehouse, raw coal warehouse, gypsum warehouse, cement slag warehouse
Working condition characteristics: Typical solid material measurement, strong dust, low dielectric constant, long range.
Selection application: High-frequency pulse radar level meter is mainly used.

  1. Power industry thermal power, hydropower, biological power generation

Production processes:
(thermal power) raw coal and pulverized coal silo, circulating water pool, low and high water level, limestone powder silo, ash hopper material level, ash silo, slag silo, desulfurization tower liquid level

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
Low water level, high temperature and high pressure;
Desulfurization tower liquid level foam, water vapor, crystallization, spray interference, side loading

Selection application:
The measurement of solid materials is mainly based on high-frequency pulse radar level meters.
High and low water level application of guided wave radar;
The low frequency radar level gauge is commonly used in the desulfurization tower liquid level;

  1. Non-ferrous metallurgy industry – aluminum, nickel, zinc, and titanium industries

Production processes:
(Aluminum production) slurry tank, dissolution tank, flash tank, post-dissolution tank, flocculation tank, settling tank, decomposition tank, alumina powder silo.

Working characteristics:
Various chemical reaction environments have high temperature, strong water vapor, stirring or corrosion factors

Selection application:
For the influence of high temperature water vapor, refer to factors such as corrosion, measuring range, stirring, and hanging material;
Choose between guided wave radar or low frequency radar level gauge.
High-frequency radar level gauges are still preferred for solids measurements.

  1. Water conservancy industry

Applications: Hydrological monitoring, flood control alarm, farmland irrigation

Characteristics of working conditions: The signal transmission is far away, the power supply voltage is low, and the installation position is affected by the embankment and dam. The radar wave with small beam angle is preferred.

Selection application: choose high-frequency radar level gauge with MODBUS protocol

  1. Food and pharmaceutical industry

Production processes:
Edible oil tank, soybean meal storage tank

Working characteristics:
Simple tank environment, or with precision requirements, antenna hygiene requirements in the pharmaceutical and food industries

Selection application:
The high-frequency radar level meter is preferred for the measurement environment with high precision;
If there are hygienic requirements, an antenna with a sealed material that meets hygienic conditions should be selected;

  1. Industrial petrochemical, coal chemical

Production processes:
Petrochemical: crude oil depot, gasoline tank, diesel tank, natural gas tank, etc.
Coal coke chemical industry: refer to the coal industry
Calcium carbide chemical industry: coal bunker, calcium carbide bunker, etc.

Working characteristics:
Solid material measurement, strong dust, low dielectric constant, long range.
The measurement environment of various oil depots is simple and may have accuracy requirements
There is pressure in the natural gas spherical tank, and the dielectric constant is small
There is oscillating interference echo in gas tank measurement
Various chemical reactor conditions are different

Selection application:
The measurement of solid materials is mainly based on high-frequency pulse radar level meters.
For various oil depots with precision requirements, high-frequency radar is preferred for spherical tanks;
Gas cabinets that are prone to oscillating interference signals also have limited selection of high-frequency radars;
The chemical reactor is selected according to the actual conditions and parameters;

  1. Environmental protection and water treatment industry

Processing link:
Water collecting well, coarse grid, fine grid, biochemical reaction pool, mud flushing pool, sludge pool, well dissolving medicine pool.

Working characteristics:
Except for ultra-long-range and narrow spaces such as water collection wells, other environments are relatively simple.

Selection application:
The water collecting well can choose guided wave radar or high-frequency radar level gauge according to the range requirements. Generally, ultrasonic level gauges are more commonly used in simple environments.

  1. Semiconductor industry

Production link: silicon micropowder warehouse
Working condition characteristics: very low dielectric constant, strong dust
Selection application: high frequency radar level meter

Radar Type Level Transmitters Applications

  • Liquids with foam, gases (CO2,methane) and other fumes
  • Highly corrosive liquids such as acids and solvents
  • High temperature applications up to 350F such as asphalt
  • Slurries
  • Acids, Caustics and Solvents
  • Vacuum applications
  • Diesel crude oil
  • Sanitary applications
  • Oil-water interface monitoring and detection

Extended reading: Hydrostatic Level Measurement

Ordering Information

When ordering Radar Type Level Transmitters, we need to consider the following factors:

  1. Application medium and measuring range:
    The physical properties of the liquid medium to be measured have a great influence on the measurement range. Liquids are usually divided into four categories: A, B, C, and D.

Class A: non-conductive liquid, the dielectric constant is less than 1.4, which has a great influence on the measurement distance, and the measurement range is
The circumference is small. such as propane.

Class B: non-conductive liquid, the dielectric constant is about 1.9~4, which has a great influence on the measurement distance.
The volume range is medium. Such as gasoline, oil, etc.

Class C: The dielectric constant is about 4~10, which has little influence on the measurement distance and has a large measurement range. like
Concentrated acid, organic solvent vinegar, ethanol, acetone, oil-water mixture, etc.

Class D: conductive liquid, dielectric constant > 10, little influence on the measurement distance, the most measuring range
big. Such as aqueous solution, diluted acid and alkali, etc. ·

When the liquid surface of the tank is smooth. The measurement range of Class A liquid is 5m. For Class B fluids
The volume measurement range is 10m. Class C liquid 15m. Class D liquids can reach 20m. When the liquid level fluctuates, the corresponding measurement range should be appropriately reduced.

  1. Process temperature and process pressure
    Radar Type Level Transmitters are suitable for high temperature and high pressure measurement. However, the temperature and pressure of the tank need to be clearly confirmed.
  2. Antenna style
    The radar level gauge consists of electronic components, waveguide connectors, mounting flanges and antennas.
    The shape of the antenna determines the thin focus and sensitivity. Therefore, the choice of antenna is particularly important.

3.1 Flare Antenna
The horn antenna is suitable for most occasions and has the advantages of good focusing, stable physical and chemical properties, durability and firmness. But it is not suitable for the measurement of corrosive media.

3.2 Rod Antenna
Rod antennas are chemically stable, easy to clean and insensitive to condensation. Suitable for corrosive media.

3.3 Under-the-flange antenna
The flange-mounted antenna is mainly used for the measurement of strong corrosive media.

3.4 Parabolic Antenna
The parabolic antenna has good focusing and is not affected by heating steam, and is especially suitable for in-tank measurement of large containers with heating steam, such as the measurement of residual oil, asphalt, etc., and the measurement range can reach 40m.

3.5 Antenna with stilling pipe or bypass pipe
Install a casing for the antenna. The casing is equivalent to a wire that transmits radar signals. It is suitable for occasions where the surface of the medium fluctuates greatly or the dielectric constant is small.

  1. Display and output signal requirements.
    Our Radar Type Level Transmitters are generally configured with local digital displays. A split display can also be configured if required by the customer.
    Support 4-20mA, 485 and other signal output.
  2. Installation method and installation size.
    Radar Type Level Transmitters support flanged, threaded, bracket mounts. When ordering Radar Type Level Transmitter, customers need to confirm the size with the manufacturer in advance.
  3. Special requirements.
    For example, anti-corrosion, explosion-proof, sanitary and so on.

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

Radar Level Measurement and guide wave radar level measurement
Radar Level Measurement and guide wave radar level measurement Image source: https://instrumentationtools.com/radar-level-measurement/

Very short microwave pulses with very low energy are transmitted and received through the antenna system. The radar wave runs at the speed of light. The operating time can be converted into level signals by electronic components. A special time extension method can ensure stable and accurate measurement in a very short time.

Electromagnetic waves propagate in the air at the speed of light. The distance between the radar level gauge and the surface of the material can be expressed by the following formula:   

D = (1/2)*CT

In the formula:

D ———the distance between the radar level gauge and the surface of the material;   

C ———Speed of light   

T ———Pulse time.

Then the liquid level is:   L = E-D

In the formula:

L — liquid level;   

E ———The total height of the tank;   

D ———Air height.

Even in the presence of false reflections, the new micro-processing technology and the unique ECHOFOX- software can accurately analyze the level echo. By inputting the size of the container, the distance value can be converted into a signal proportional to the level. The instrument can be debugged with empty positions.

Radar Type Level Transmitters have the advantages of high precision, long life, low maintenance, high performance and so on. Widely used in the industry. Continuous measurement can be performed in harsh environments such as high temperature, high pressure, steam, vacuum and high dust. However, different models of Radar Type Level Transmitters are selected in different environments, and the antennas used are also different.

  1. Rod antenna

Insulated rod antennas are usually made of polymer materials such as polytetrafluoroethylene and polypropylene. Good corrosion resistance. Can be used in strong acid, alkali and other media.

However, the microwave emission angle is relatively large (about 30°), and there are many side lobes. For the case where the structure of the tank is more complicated. There will be more interference echoes. The signal-to-noise ratio is small and the precision is low.

But easy to clean. It is often used to measure tanks and corrosive media with good operating conditions, large diameters, and small measuring ranges.

If the measured medium is volatile and condensed, it is better to choose a rod antenna or a water drop antenna.

  1. Flare antenna

At the same frequency, the larger the diameter of the horn, the smaller the emission angle. If it is a high frequency radar level gauge, the emission angle is smaller and the accuracy is higher.

Most economical radar level gauges use microwave frequencies of 5.8GHz or 6.3GHz. Its emission angle is large, and it is easy to generate interference echoes on the container wall or internal components.

Although the horn antenna increases can reduce the emission angle. But the volume increases and the installation is inconvenient. And the improvement is limited.

Using high-frequency radar, the launch angle can reach 8°. This enables high measurement accuracy even when measuring the level of long and narrow tanks.

If it is used in a large-range measurement site, choose a radar level meter with a large horn antenna. Small horn antennas are suitable for small containers.

If the fluidity of the measured medium is poor and there is a phenomenon of hanging material, then choose a horn or a rod radar level gauge.

  1. Parabolic antenna

This is a new type of antenna that has been introduced recently, and is mostly used in radars that transmit at high frequencies. Because its emission angle is only 7°. Ideal for measuring precise targets and measuring around obstacles.

But its antenna size is large. If the X-band is used, the diameter is up to Φ454mm, and the opening size should be larger than 500mm, which is not very convenient for installation and use.

  1. Plane antenna

The planar antenna adopts planar array technology. That is, a multi-point emission source. Compared with a single-point emission source, it is measured on a plane. rather than a definite point.

With the corresponding electronic circuit, the measurement accuracy of the radar level gauge can reach ±1mm. It can be used for precision metering of storage tanks. Mainly used for metrology-grade radar level gauges. Planar antennas are suitable for a variety of working conditions.

Extended Reading: FMCW Radar for High Temperature Level Sensor

  1. Sleeve antenna

When the dielectric constant is small (1.6~3) or the liquid surface produces continuous eddy current or the device in the container causes false reflection, this type of instrument should be selected.

The casing has a focusing effect on the radar wave, and the antenna is installed in the still-pipe or bypass pipe.

The inner diameter of the casing has an effect on the propagation time of the radar wave. Therefore, when setting the parameters, the parameters of the inner diameter of the casing should be set. Compensation for in-travel time.

In addition, this type of antenna requires that the measured medium has good fluidity and is not easy to hang.

If the container under test has a stirring paddle. And the radius of rotation of the blade is almost equal to the diameter of the tank. Then the echo of the radar level gauge will be seriously disturbed. At this time, the still-pipe radar level gauge is used.

  1. Guided wave radar antenna

Sending and receiving electromagnetic waves through guided metal or cables is a contact measurement.

Because it has little effect on dust, steam, and the adhesion medium on the probe. Therefore, it is more widely used in solid material level and liquid level measurement with small dielectric constant.

The dual-cable guided wave radar level gauge uses the change of measuring capacitance to measure the level of the liquid level. The medium between the two electrodes is the liquid and the gas above it. Suitable for level measurement of corrosive and high pressure media.

Fundamentally solve the influence of temperature, humidity, pressure, material conductivity and other factors on the measurement process. Therefore, it has extremely high anti-interference and reliability.

Coaxial tube radar level gauge is a guided wave radar level gauge equipped with a coaxial tube probe. It is used for liquid level measurement and control of liquids with low dielectric constant or surface fluctuations. Such as

If the dielectric constant of the measured material is too low, the general type of radar level meter is not suitable.

Extended Reading: Guided-wave radar (GWR) level transmitter working principle

Most of the time, people don’t think of using radar level sensors as level switches.
The output of radar liquid level sensor is mostly 4-20mA.
However, if the customer’s working conditions require output switching. It can also be customized.
For example, we can add a secondary gauge to the output of the radar level sensor. Convert the current signal into a digital signal.

Extended reading: Float Level Sensors – Single and Multipoint

Radar Type Level Transmitters can be used not only in various tanks. It can also be used in various storage tanks.

Radar Tank Level Measurement

Different storage tanks have different types of Radar Type Level Transmitters.

A spherical tank, also known as a spherical container, has a spherical shell.
This kind of storage tank is mainly used for the storage and transportation of various gases, liquids and liquefied gases. It is widely used in chemical, metallurgy, petroleum and other industries.

Vaulted tank, also known as vaulted storage tank. It refers to the steel container with the top of the storage tank in the shape of a spherical tank and the tank body in the shape of a cylinder.
This type of storage tank is widely used in the fluid industry, such as the most common type C liquids. In addition, refineries also commonly use vaulted tanks to store diesel fuel, fuel oil, and more.

Floating roof tank, also known as floating roof storage tank. It is divided into inner floating roof tank and outer floating roof tank.

An internal floating roof tank is a floating roof tank with a tank top inside. Its top is a combination of a floating roof and a vault. The inside is a floating roof and the outside is a vault.

The floating roof of an external floating roof tank is a floating roof. It floats on the surface of the liquid storage and floats up and down as the liquid flows in and out. In refineries, these two types of storage tanks are often seen.

Horizontal storage tank. It is mainly composed of tank body, accessories and brackets. It is mainly used in the petrochemical industry for the storage of reaction media, crude oil, petroleum products, etc.

Vertical storage tank. It is mainly composed of foundation, tank bottom, tank wall, tank top and accessories. It is often used as a large oil tank for the petroleum industry. If it is divided by the structure of the tank top, vertical storage tanks can be divided into internal floating roof tanks, external floating roof tanks and vaulted roof tanks.

There are not many types of common measurement tanks for Radar Type Level Transmitters. However, different companies will install some auxiliary equipment inside according to the needs of the work, such as the most common heating coils, agitators, and so on. Therefore, when installing the radar level gauge, not only should pay attention to the shape and size of the storage tank, but also pay special attention to the internal structure.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

More Featured Level Transmitters for Sale

Frequently
Asked
Questions

We have two kinds of radar level transmitters:

  • Noninvasive or Non-contact Systems
  • Invasive or Contact System

Extended reading: Hydrostatic Level Measurement

The radar transmitter uses a high-frequency oscillator as a microwave generator. The generator produces microwave
shoot down through the antenna. When microwaves encounter obstacles, some of them are reflected back. According to the time difference between the transmitted wave and the reflected wave (ie microwave pulse travel). to calculate the distance to the material surface.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

There are 7 main types of level transmitters that Sino-Instrument offers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

For more about: Types of Level Transmitters

Difference 1.
Different measuring ranges Ultrasonic liquid level measuring range: 0-50 meters;
The radar level gauge can measure all media with medium constant >1.2 in vacuum. The measuring range can reach 120 meters.

Difference 2.
The ultrasonic level gauge emits different substances by the sensor (transducer) to emit sound waves. After being reflected by the liquid surface, it is received by the same sensor or ultrasonic receiver.
The radar level gauge emits very short microwave pulses with very low energy, which are transmitted and received through the antenna system. The radar waves travel at the speed of light.

Difference 3.
Ultrasonic level gauges are widely used to measure the height of various liquid and solid materials.
Water and sewage treatment: pump room, water collection well, biochemical reaction tank, sedimentation tank, etc.;
Electric power, mining: mortar pool, coal slurry pool, water treatment, etc.
Radar level gauges can measure liquid and solid media.
For example: crude oil, slurry, raw coal, pulverized coal, volatile liquid, etc.

Extended reading: Ultrasonic liquid level sensors

About Non-Contacting Radar, Emerson also has a very comprehensive introduction. You can refer to this.

Sino-Inst offers over 10 Radar level transmitters for level measurement. About 50% of these are Radar level meters, 40% is the tank level sensor.

A wide variety of radar level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of radar level measurement instrumentation, located in China.

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