Yearly Archives: 2020

SI-FMF21 FMCW Radar Silo Level Sensor

Posted on by

Silo Level Sensor is specially used for level measurement of solid material silos (including fine ore silos). Perfect Solutions for Silo Level Monitoring and Control.

SI-FMF21 FMCW Radar Silo Level Sensor

SI-FMF21 FMCW Radar Silo Level Sensor adopts 120GHz FM continuous wave technology, 10GHz sweep bandwidth, and has electromagnetic characteristics in the terahertz band. It has the ability to penetrate materials with small dielectric constant. In a strong adhesion and strong dust environment, the measurement is stable without interference and does not require any purge device. The measuring distance can reach 150 meters. Perfect solutions in continuous level measurement and remote inventory management systems.Like the storage of powders & bulk solids in bins, silos, vessels, etc.

Sino-Inst offers a variety of FMCW Radar Silo Level Sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Radar Level Sensors

Features of SI-FMF21 FMCW Radar Silo Level Sensor

  • The 120GHz frequency modulated continuous wave radar level meter only needs 80ms to complete a complete measurement and calculation process for a distance of 100m. This allows the system to have more time and resources to deal with all kinds of things in meter level applications. For example: probability evaluation/prediction/credibility analysis/input/output/communication, etc.
  • The PTFE lens antenna is fully enclosed and potted. It solves the structural treatment of the antenna near-field radiation suppression. This makes it have good directional performance. The beam angle is controlled within 1 degree. The manufacturing process difference of batch products , The deviation may be about ±0.3 degrees.
  • The 120GHz frequency modulated radar level gauge is especially suitable for high temperature, high pressure or high dust, and multiple agitated spaces. It meets many measurement requirements that require a large range and high precision.
  • Evaporation and dust will not affect the measurement;
  • Level measurement of corrosive liquid, no contact, no corrosion-stable measurement;
  • Liquid level measurement of foam and strong dust;

Specifications of SI-FMF21 FMCW Radar Silo Level Sensor

Measuring medium:Liquid
Measuring range:0.3m~150m 
Process connection:Flange≥DN80
Process temperature:-40～110℃
Process pressure:-0.1～0.3 MPa
Accuracy:±5mm         
Protection level:IP67
Frequency Range:123GHz
power supply:Two-wire system (DC24V)/four-wire system (DC12V~24V)/four-wire system (AC220V)
Explosion-proof grade:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Housing:Aluminum/plastic/stainless steel
Signal output:Two-wire system 4…20mA/HART protocol Four-wire system 4…20mA/RS485 Mod bus

Radar Silo Level Sensor Applicaitons

Radar Silo Level Sensor is suitable for high temperature and high-pressure reactor, super large storage tank, and still tube measurement.

Radar Silo Level Sensor is suitable for high-precision metrological measurement and perspective measurement.

Radar Silo Level Sensor is suitable for extremely harsh working conditions such as strong dust and steam, and storage tanks with special processes such as stirring and heating rods.

  • Chemical industry
  • Torpedo car
  • Liquefied petroleum gas
  • Coal
  • Food and grains
  • Bulk materials
  • Cement
  • Coke

Extended reading: GWR Solid Level Sensor-for Cement silo-Ash powder measure

Solutions for Silo Level Monitoring and Control

Cement Silo Level Indicator

Cement industry material process storage level detection. Including clinker warehouse, raw meal homogenization warehouse, raw material mixing warehouse, limestone storage warehouse, raw coal warehouse and cement mixing warehouse, etc.

The cement silo (tank) is not a simple silo. It also contains many auxiliary devices. Such as arch breaking device, dust collector, level gauge, pressure safety valve and so on.
Today, I will mainly explain to you: the main functions and characteristics of the cement silo (tank) level sensor:

Extended reading: Radar level sensor for solids – Dust solid level measurement

First, the cement silo (tank) liquid level sensor is a sensor used to detect the height change of the material in the container. It can continuously detect the height, volume and other values ​​of the material, and transmit the relevant information to the computer or display instrument.

Secondly, the cement tank liquid level sensor is mainly used to automatically detect and control the limit material level of various materials (such as powder, granules or blocks). Different types of material straightening machines can meet the requirements of different working conditions.

Furthermore, in the concrete mixing equipment, the cement tank is a closed storage device. The user cannot intuitively understand the amount of powder in it, and a liquid level sensor is needed at this time.
The liquid level sensor in the cement tank can accurately record the position of the material in the cement tank for easy management.

Lime Silo Level Sensor

As a multifunctional product, lime is not only used to purify raw materials, but also often used to clean and neutralize waste water from sugar beets. The resulting by-products are also useful because it contains a mixture of lime and organic residues. They are usually reused as soil additives and conditioners in agriculture and are rich in organic matter.

Most sugar processing plants have their own lime kilns, which require good high-purity limestone to burn. This “high calcium” limestone is converted into quicklime in a lime kiln at a temperature of 900°C. In order to obtain the milk of lime, the “calcined” lime is mixed into the water. In this process, accurate and reliable level measurement can ensure consistent production.

The processing area must have a high level of safety. Because lime is harmful, especially irritating to the skin and eyes. All outer surfaces of the radar level gauge are of plastic or stainless steel construction, with a fully enclosed PTFE antenna system. This means that in this highly alkaline environment, the sensor will have minimal corrosion and a longer service life.

Extended reading: Radar Level Meter for Corrosive Liquids

Featured Silo Level Monitoring Systems

SI-FMF11 FMCW Radar Level Transmitter 120GHz
SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor
SI-FMF13 FMCW Radar Water Level Sensor
SI-FMF15 FMCW Radar High Temperature Level Sensor
Portable Ultrasonic Liquid Level Indicator
ULT-100A Ultrasonic Level Transducer
SI-U02 Multi-Point Liquid Level Float Switch
LD series Rigid Probe Magnetostrictive Level Transmitter

FAQ

What is an ultrasonic level sensor?

Ultrasonic Level Sensing is a low-cost liquid level measurement technology. Ultrasonic Level Sensing sensors and transmitters are used for tank or river level measurement. Ultrasonic Level Sensing does not need to contact the medium, can be continuously measured at, low cost. Therefore, Ultrasonic Level Sensing is very popular among users. Ultrasonic liquid level sensors are available in general and intrinsically safe types. Output 4~20mA standard signal or output the measurement result to the secondary meter through RS-485. Meets the system’s automatic control.

Which sensor is used to detect water level?

The Water level sensor mainly has contact type and non-contact type. Different water level sensors have different working principles.
1. The first type is contact. Including single flange static pressure / double flange differential pressure liquid level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, input type liquid level transmitter, electric inner float level transmission Devices, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, service level transmitters, etc.
2. The second type is non-contact. Divided into an ultrasonic liquid level transmitter, radar liquid level transmitter, etc.

What is the radar level measurement range?

When selecting radar, there is often a misconception that the selected range should be greater than the height of the tank.
In fact, the range marked on the radar maybe its range. The selection also depends on the characteristics of the container, such as the surface of the storage tank is stable or corrugated, and even stirring. The actual material level that the radar level gauge of the same model can measure under different conditions is very different. E+H’s FMR-23lE radar has a range of 20m, but it can measure 20m for liquids on a smooth surface. If it is used on a buffer tank without stirring and ripples, it can only measure 10m. When it is used to measure the material level with stirring of more than ten meters, the low material level is often not measured. This is actually the selection range is not enough, the problem is solved after increasing the range. Similarly, the dielectric constant of the medium is also easy to be ignored, and attention should be paid to the medium with a small dielectric constant.

Request a Quote

Please enable JavaScript in your browser to submit the form

Bimetallic Thermometer—-WSS Series

Posted on by

Bimetallic thermometer is a kind of field testing instrument for measuring low and medium temperature. It is used especially in industry.

It can directly measure the temperature of the liquid, vapor and gas within -80℃~+500℃ in a variety of production processes. The bimetallic thermometer is made of a metal sheet which is made into a ring and bend shape. When one end is heated and expanded, it will lead to the rotation of the pointer and the working instrument will show the temperature value of the thermal electric potential.

Sino-Inst offers a variety of bimetallic thermometer for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Temperature Measurement

How Does a Bimetallic Thermometer Work?

The working principle of bimetallic thermometer depends on the two fundamental properties of the metal.The metal has the property of thermal expansion, i.e., the metal expand and contract concerning the temperature.The temperature coefficient of all the metal is not same. The expansion or contraction of metals is different at the same temperature.

What Is WSS Series Bimetallic Thermometer And Its Uses?

WSS series bimetallic thermometer is an on-site detection instrument for measuring low and medium temperature. The bimetal thermometer can directly measure the temperature of liquid, steam and gaseous media in the range of -80℃～+500℃ in various production processes.

What Is The Meaning Of Bimetallic?

They are made up of bimetallic strips formed by joining two different metals having different thermal expansion coefficients. Basically, bimetallic strip is a mechanical element which can sense temperature and transform it into a mechanical displacement. This mechanical action from the bimetallic strip can be used to activate a switching mechanism for getting electronic output. Also it can be attached to the pointer of a measuring instrument or a position indicator. Various techniques such as riveting, bolting, fastening can be used to bond two layers of diverse metals in a bimetallic strip. However the most commonly used method is welding. Since two metals are employed to construct a bimetallic strip, hence they are named so.

Read more about Thermometer

Characteristics

  1. It can display the temperature on-site, which is intuitive and convenient;
  2. It is safe and reliable with long service life;
  3. With a variety of structural forms, which can meet different requirements.

Main Technical Parameters

  • 1.Product implementation standard:JB/T8803-1998
  • 2.Nominal diameter of dial：60,100,150
  • 3.Precision grade：（1.0）,1.5
  • 4.Thermal response time：≤40s
  • 5.Protection level：IP55
  • 6.Angle adjustment error Angle adjustment error should not more than 10% of the range
  • 7. Return difference: the return difference of the thermometer should not be more than the absolute value of the error limitation.
  • 8. Repeatability: the repeatability of the thermometer should be no greater than 1/2 of the absolute value of the basic error limitation.

Classification

According to the connection direction of the bimetal thermometer dial and the protective tube, the bimetal thermometer can be divided into four types: axial type, radial type, 135°direction type and universal type.

  1. Axial bimetal thermometer: The pointer plate is connected vertically to the protection tube.
  2. Radial type bimetal thermometer: The pointer disc is connected in parallel with the protection tube.
  3. 135°direction bimetallic thermometer: the pointer disc and the protection tube are connected at 135°.
  4. Universal bimetal thermometer: The connection angle between the pointer plate and the protective tube can be adjusted arbitrarily.
135°type

WSS-420 WSS-520 WSS-421 WSS-521 WSS-422 WSS-522 WSS-432 WSS-532 WSS-424 WSS-524 WSS-425 WSS-525 WSS-526

Axial type

WSS-300 WSS-400 WSS-500 WSS-301 WSS-401 WSS-501 WSS-302 WSS-402 WSS-502 WSS-303 WSS-403 WSS-503 WSS-304 WSS-404 WSS-504 WSS-305 WSS-405 WSS-505 WSS-306 WSS-406 WSS-506

Radial type

WSS-310 WSS-410 WSS-510 WSS-311 WSS-411 WSS-511 WSS-312 WSS-412 WSS-512 WSS-313 WSS-413 WSS-513 WSS-314 WSS-414 WSS-514 WSS-315 WSS-415 WSS-515 WSS-316 WSS-416 WSS-516

Universal type

WSS-480 WSS-580 WSS-481 WSS-581 WSS-482 WSS-582 WSS-483 WSS-583 WSS-484 WSS-584 WSS-485 WSS-585 WSS-586 WSS-486

Installation Requirements

For the installation of bimetal thermometers, attention should be paid to accurate temperature measurement, safety and reliability, and convenient maintenance, and does not affect equipment operation and production operations. The above requirements must be met. When selecting the installation position and insertion depth of the thermal resistance, the following should be paid attention to A few points:

(1) In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measurement point should be selected reasonably and try to avoid installing thermal resistance near the dead corner of the valve, elbow, pipeline and equipment.

(2) The thermal resistance with protective sleeve has heat transfer and heat dissipation loss. In order to reduce the measurement error, the thermocouple and thermal resistance should have sufficient insertion depth:

  • a. For the thermal resistance measuring the temperature of the fluid in the center of the pipeline, the measuring end should generally be inserted into the center of the pipeline (vertical installation or inclined installation). If the pipe diameter of the tested fluid is 200 mm, the insertion depth of the thermal resistance should be 100 mm;
  • b. For temperature measurement of high-temperature, high-pressure and high-speed fluids (such as main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, the shallow insertion method of the protective tube or the hot sleeve type can be adopted Thermal resistance. For shallow plug-in thermal resistance protection sleeves, the depth of insertion into the main steam pipe should not be less than 75mm; the standard insertion depth of thermal-jacket thermal resistance is 100mm;
  • c. If you need to measure the temperature of the flue gas in the flue, even though the flue diameter is 4m, the thermal resistance insertion depth is 1m;
  • d. When the insertion depth of the measuring original exceeds 1m, it should be installed vertically as much as possible, or a support frame and protective sleeve should be installed.

Request a Quote

Please enable JavaScript in your browser to submit the form

What Is Thermal Resistance

Posted on by

What Is Thermal Resistance?

Thermal resistance is one of the most commonly used temperature detectors in medium and low temperature regions.

Thermal resistance thermometry is based on the characteristic that the resistance value of metal conductors increases with temperature. Its main features are high measurement accuracy and stable performance.

Among them, the measurement accuracy of platinum thermal resistance is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard benchmark.

Thermal resistances are mostly made of pure metal materials. The most widely used are platinum and copper. In addition, materials such as nickel, manganese and rhodium have been used to manufacture thermal resistances.

There are many types of temperature-sensing materials commonly used in metal thermal resistors, and platinum wire is the most commonly used.

In addition to platinum wire, metal thermal resistance materials for industrial measurement include copper, nickel, iron, iron-nickel, etc.

RFQ Thermal Resistance

Features of Thermal Resistance

  • Stable physical and chemical properties, high measurement accuracy, corrosion resistance and long service life.
  • The temperature coefficient of resistance should be large, that is, the sensitivity should be high.
  • The resistivity should be high to make the thermal resistance smaller and reduce the time constant of temperature measurement.
  • The heat capacity should be small, so that the thermal inertia of the resistor body is small and the response is more sensitive.
  • Good linearity, that is, the relationship between resistance and temperature is linear or a smooth curve.
  • It is easy to process, inexpensive, and reduces manufacturing costs.
  • Good reproducibility, easy for mass production and parts interchange.

Measuring Principle of Thermal Resistance

The temperature measurement principle of thermal resistance is different from that of thermocouple in that thermal resistance measures temperature based on the thermal effect of resistance. That is, the resistance of the resistor body changes with temperature.

Therefore, as long as the resistance change of the temperature-sensing thermal resistance is measured. temperature can be measured. There are mainly two types of metal thermistors and semiconductor thermistors.

The resistance value and temperature of a metal thermal resistor can generally be expressed by the following approximate relationship.
That is, Rt=Rt0[1+α(t-t0)]

where:
Rt is the resistance value at temperature t;
Rt0 is the corresponding resistance value at temperature t0 (usually t0=0℃);
α is the temperature coefficient.

The relationship between the resistance value and temperature of the semiconductor thermistor is: Rt=AeB/t

where Rt is the resistance value when the temperature is t;
A and B are constants that depend on the structure of the semiconductor material.

In comparison, the thermistor has a larger temperature coefficient. The resistance value at room temperature is higher (usually in the thousands of ohms). But the interchangeability is poor and the nonlinearity is serious. The temperature measurement range is only about -50~300℃. It is widely used in temperature detection and control for home appliances and automobiles.

Learn more: Thermal resistance From Wikipedia

Common Types of Thermal Resistance

Platinum thermal resistance is characterized by high measurement accuracy. Good stability and reliable performance.

However, in reducing media, especially at high temperature, it is easily stained and brittle by the steam reduced from the oxide. And change the relationship between resistance and temperature.

In order to overcome the above shortcomings, the thermal resistance core should be installed in a protective sleeve.

Copper thermal resistance is commonly used in industry to measure the temperature in the range of -5O℃～+15O℃.

Copper is easy to purify and is much cheaper than platinum. The temperature coefficient of resistance is large and the relationship is linear. Therefore, when making a thermal resistance with a certain resistance value, compared with platinum, if the length of the resistance wire is the same, the copper resistance wire is very thin, and the mechanical strength is reduced. If the wire diameter is the same, the length will increase many times and the volume will increase.

In addition, copper is easily oxidized above 100°C and has poor corrosion resistance, so the working temperature does not exceed 150°C.

Nickel thermal resistance has a large temperature coefficient and a higher sensitivity than platinum and copper. It is often used to measure temperatures in the range of -60°C to +180°C.

Due to the complicated manufacturing process of nickel thermal resistance, it is difficult to obtain nickel wires with the same α. Therefore, its measurement accuracy is lower than that of platinum thermal resistance. The graduation numbers of standardized thermal resistances currently stipulated in my country are Ni100, Ni300, and Ni500.

The semiconductor spot thermometer is a thermistor made of metal oxides such as manganese, nickel, copper and iron as the temperature measuring element. Its shapes are bead-shaped, round, washer-shaped and sheet-shaped. Commonly used are 61 type bead and miniature bead semiconductor thermistors.

The difference from general thermal resistance is that it has a negative temperature coefficient of resistance. As the temperature increases, the resistance decreases. The range of change is also large, and the temperature coefficient of resistance α reaches -2 to -7%. It is 10 to 100 times larger than metal thermal resistance. Therefore, display instruments with lower accuracy can be used.

Thermal Resistance vs Thermal Conductivity

Thermal conductivity, also known as “thermal conductivity”. [1] is a measure of the thermal conductivity of a material. The symbol is λ or K.
It refers to the heat transferred through the unit horizontal cross-sectional area per unit time when the vertical downward gradient of the temperature is 1°C/m.

Its specific definition is: take two parallel planes with a distance of 1 meter and an area of 1 square meter inside the object perpendicular to the direction of heat conduction. If the temperature difference between the two planes is 1K, it will be conducted from one plane to another within 1 second. The amount of heat is specified as the thermal conductivity of the substance. Its unit is: watt · m-1 · Kai-1 (W · m-1 · K-1).

If there is no heat loss, for a block material with parallel opposite sides, there is
E/t=λA(θ2-θ1)/ι

In the formula, E is the energy transferred in the time t. A is the cross-sectional area. ι is the length. θ2 and θ1 are the temperatures of the two sections, respectively.

In general there are:
dE/dt=-λAdθ/dι

Thermal Resistance Example Problems

TroubleshootingReasonMethod of exclusion
The displayed value of the instrument is lower than the actual value or the displayed value is unstableThere are metal shavings, dust in the protection tube, dirt between the terminals and short circuit of the thermal resistance (water droplets, etc.)Remove metal chips, clean dust, water droplets, etc., find short-circuit points, strengthen insulation, etc.
Display value infinityThe thermal resistance or the lead wire is disconnected and the connection terminal is loosened, etc.Replace the resistor body, or weld and tighten the wiring screws, etc.
There is a change in the relationship between resistance and temperatureThe platinum resistance wire material is corroded and deterioratedReplace the thermal resistance
The display value of the meter is zero or has a negative valueThe thermal resistance wiring is wrong, the thermal resistance is short-circuited, or the cable is short-circuitedCorrect wiring, find short circuit, strengthen insulation, replace resistor body or cable

Temperature Range And Tolerance Level

GraduationTolerance levelWire wound element effective temperaturerangeMembrane element effective temperaturerangeRange of temperature measurement
Pt100AA-50~2500~150±（0.1+0.0017丨t丨 ）
Pt100A-100~450-30~300±（0.15+0.002丨t丨 ）
Pt100B-196~600-50~500±（0.3+0.005丨t丨 ）
Pt100C-196~600-50~600±（0.6+0.01丨t丨 ）
Pt100–-50~150—±（0.3+0.006丨t丨 ）
t = temperature Absolute value,units for C

Thermal Resistance With No-fixed Device

WZP-120 WZP -120 2 WZP-120G WZP -120G 2 WZP-121 WZP -121 2 WZP- 121G WZP -121G 2 WZP- 130 WZP -130 2 WZP- 130G WZP -130G 2 WZP- 131 WZP -131 2 WZP- 131G WZP -131G 2 WZC-120G WZC-120 WZC-130 WZC-130G WZC-121 WZC-121G WZC-131 WZC-131G

1) Model 120 and 121 are anti-spring type with the protective grade being IP65; Model 130 and 131 are waterproof type with the protective grade grade being IP55. 2) Protective tube material is 1Cr18Ni9Ti and the rest of the material is ordered according to the agreement.

Fixed Screw Type Thermal Resistance

WZP-220 WZP -220 2 WZP-220G WZP -220G 2 WZP-221 WZP -221 2 WZP- 221G WZP -221G 2 WZP- 230 WZP -230 2 WZP- 230G WZP -230G 2 WZP- 231 WZP -231 2 WZP- 231G WZP -231G 2 WZC-220 WZC-220G WZC-230 WZC-230G WZC-221 WZC-221G WZC-231 WZC-231G

1) Model 220 and 221 are anti-spraying type with the waterproof grade being IP65. model 230 and 231 are waterproof type with the protective grade being IP55. 2) Protective tube material is 1Cr18Ni9Ti and the rest of the material is ordered according to the agreement. 3) Nominal pressure is ≤4.0MPa.

Related Blogs

Guide for Digital Fuel Flow Meter

Digital Fuel Flow Meter is a flow meter dedicated to measuring fuel, diesel, gasoline, and petroleum. Digital Fuel Flow Meter generally has a digital display or signal output. Such as…

The Myth of Ceramic Pressure Sensor

What is a ceramic pressure sensor? Ceramic pressure sensors are sensor diaphragms made of ceramic alumina (Al2O3). Ceramic is a material with high elasticity, corrosion resistance, wear resistance, impact, and…

Water Flow Measurement for Pipes and Open Channels

Water flow measurement is common in both industry and life. You may often hear about the use of electromagnetic flowmeters to measure wastewater. The clamp-on ultrasonic flowmeter measures large water…

Sino-Inst, Manufacuturer for Thermal Resistances, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermal Resistances, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Request a Quote

Please enable JavaScript in your browser to submit the form

SI-FMF15 FMCW Radar for High Temperature Level Sensor

Posted on by

High temperature level sensor is based on FMCW Radar to measure high temperature liquid. Non-contact measurement. The temperature is as high as 240°C. IP67 protection. rs485 output.

High Temperature Level Sensor is also called high temperature molten salt level sensor. Use continuous frequency modulation wave radar to measure. SI-FMF15 FMCW Radar High Temperature Level Sensor is manufactured based on the principle of linear frequency adjustment-radar working. It can ensure the accurate and stable liquid level measurement of the radar in high temperature, high pressure, strong corrosion, strong dust and other environments. High temperature type 240℃, special customization can reach 1200℃.

Sino-Inst offers a variety of FMCW Radar High Temperature Level Sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Radar Level Sensors

Features of SI-FMF15 FMCW Radar High Temperature Level Sensor

  1. Measurement accuracy
    The measurement accuracy of the terahertz frequency-modulated continuous wave radar level meter is ±1mm. Reliable and high-precision measurement. It really reduces the workload of field operators.
  2. Launch angle
    Radar wave emission angle <2°. Even in extremely complex installation environment, it can measure the material level stably and accurately.
  3. Measuring range
    The measurement range of the terahertz FM radar level meter is 0.08m-150m. It has a very small blind area and a large measurement range. It can meet most measurement occasions.
  4. Penetration
    The terahertz frequency-modulated continuous wave radar level gauge is extremely penetrating. According to the dielectric constant of the crystalline medium, it can penetrate the crystalline layer of up to 100mm.
  5. High temperature conditions
    The terahertz FM radar level meter has good penetration performance. For high temperature occasions, thermal insulation accessories such as ceramic or quartz glass can be added to the front end of the antenna. With the special environment learning function, it can measure high temperature liquids.
  6. Strong corrosiveness
    It has good penetration performance. For strong corrosion occasions, the front end of the antenna can be equipped with PTFE or PFA anti-corrosion sheath. And the maximum thickness of 30mm fluoroplastic can be added. It has good pressure resistance while anti-corrosion.
  7. Foam products
    It has good penetration performance. Therefore, it can penetrate the foam up to 1000mm for liquid level measurement. The terahertz frequency modulation radar level gauge can also measure the foam itself.
  8. Sensitivity
    It has three adjustable sensitivity. When high sensitivity is selected, the radar response time is less than 1S.

Specifications of SI-FMF15 FMCW Radar High Temperature Level Sensor

Measuring medium:Liquid
Measuring range:0.1m~120m
Process connection:Flange≥DN80
Process temperature:Standard model -60~130℃;
high temperature model -60~240℃;
special customization -60~1200℃
Process pressure:-0.1～2.5 MPa
Accuracy:±2mm         
Protection level:IP67
Frequency Range:123GHz
power supply:Two-wire system (DC24V)/four-wire system (DC12V~24V)/four-wire system (AC220V)
Explosion-proof grade:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Housing:Aluminum/plastic/stainless steel
Signal output:Two-wire system 4…20mA/HART protocol Four-wire system 4…20mA/RS485 Mod bus

Extended reading: What is Modbus Protocol?

SI-FMF15 FMCW Radar Level Sensor Applicable Medium

  • Level measurement of solids (powders, granules, blocks);
  • Level measurement of plastic particles with low dielectric constant;
  • Liquid level measurement. Reactor liquid level. Large steam level. Foam product level. Crystalline product level. Ultra-high temperature product level. Ultra high pressure product level. Hygienic product level.

Extended reading: Dam water level measurement

Advantages of FM Radar Level Meter

FMCW radar level meter is suitable for various complex working conditions. It can also ensure measurement stability and accuracy in high temperature and high dust environments.

  • Not affected by atmospheric precipitation;
  • Ambient temperature from -60℃;
  • from outside the storage tank;
  • The inner antenna of the terahertz FM continuous wave radar level meter is heated and protected by a fluoroplastic lens
  • The measurement beam is narrow. Easy installation and stable measurement;
  • Level measurement accuracy;
  • Not limited by the temperature in the container;
  • Evaporation and dust do not affect the measurement;
  • Boiling liquid level measurement;
  • Corrosive liquid level measurement. No contact, no corrosion;

FMCW Radar Working Principle

In the early years, a non-contact frequency-modulated continuous wave radar level meter produced by a company in the United States used FMCW technology to perform more accurate level measurement for more complex occasions. This FMCW technology has caused a global sensation. It has made more researchers devote themselves to FMCW technology. FMCW here is frequency modulated continuous wave.

This FMCW radar technology uses a high frequency sweep signal typically 8.5 to 9.9 GHz. The radar signal is sent from one end of the antenna and is received by the receiver after time t. The frequency difference Δf between the transmitting and receiving is converted into the level of the measured medium by the Fourier transform method.

However, with the development of the times and the efforts of scientific researchers, the continuous waves of 26GHz, 28GHz, 80GHz and 120GHz have been derived from the FM continuous wave radar level gauge.

FM continuous wave radar level meter is a general-purpose instrument for measuring coal, cement, grain, alumina, limestone, chemical raw materials and other materials. It is widely used in cement, chemical, environmental protection, electric power, food and other industries.

The 120GHz radar level meter is especially suitable for high temperature, high pressure or high dust, and multi-stirring environments. It meets many measurement requirements that require a large range and high precision.

Terahertz FM CW radar level meter mainly uses triangular FM continuous wave. After the transmitted signal is scattered by the target, it is accepted by the antenna. The delay time τ=2R/c. Among them, R is the distance from the target to the antenna, and c is the propagation speed of the electromagnetic wave. .

When the detection target is stationary, the distance calculation formula is R=(cT/4B)×fb, where T is the period of the triangular wave, and B is the frequency modulation bandwidth.

From the formula R=(cT/4B)×fb, it can be obtained that the frequency fb of the beat frequency signal has a linear relationship with the distance R. Therefore, the key to the ranging system is to measure the frequency of the beat frequency signal.

Under certain conditions of bandwidth B and period T, the distance R can be calculated as long as the frequency fb is obtained. Therefore, the accuracy of frequency measurement directly affects the accuracy of distance measurement.

The difference frequency signal is usually sampled by A/D and then calculated by FFT to obtain the discrete spectrum of N points. Then fb is obtained by the peak frequency of the spectrum. Because the discrete spectrum will have a frequency domain sampling interval △f=fs/N.

In the formula, fs is the sampling frequency, and N is the number of sampling points.

The discrete spectrum sampling obtained by FFT generally cannot collect the peak point of signal frequency. That is, the integer multiple of the frequency interval does not coincide with the peak point, which causes the result of FFT analysis to be inconsistent with the actual frequency, resulting in frequency estimation error.

Extended Reading: Case: High Temperature Radar Level Transmitter for Melted Salt-Solar Photovoltaic Power Station

Level Measurement with FMCW Radar in Steam and High Temperature

When the measured medium is heated, or stored products with relevant physical and chemical properties (acids, alkalis, alcohols, etc.), there may be vapor accumulation in the upper space of the measured medium.

There are various vapors in the air in the space between the level gauge and the medium. It will not affect the accuracy and stability of the measurement. The FM continuous wave radar level gauge has this characteristic.

Level measurement by means of ultrasonic or optical (laser) means is a very unstable and inaccurate method. Because the speed of sound propagation depends on the composition of the atmosphere through which it passes. Direct optical visibility is required for measurement by laser means.

Level Sensors for High Temperature Applications

SIRD-705 GWR Level Sensor for High Temperature & High Pressure

The high temperature and high pressure guided wave radar level sensor is specially designed for high temperature and high pressure occasions. The product is mainly used for liquid level measurement on various boiler drums. Has high safety and accuracy. The highest rated pressure reaches 40MPa. The highest rated temperature reaches 400℃. It is suitable for high and low pressure heaters, condensers and deaerators in thermal power plants. As well as for liquid level measurement under high temperature, high pressure, vacuum and other steam conditions.

SMT3151TR Hydrostatic level transmitter-Rod Type

Hydrostatic level transmitter is also called hydrostatic level gauge. The rod-type Hydrostatic level transmitter utilizes the linear relationship between liquid height, density, and pressure. The change of the level is converted into a linear 4-20mADC standard signal output. Suitable for tank level measurement. Flange or threaded installation. Can withstand high temperatures up to 450 ℃.

High Temperature Float Switch

Float level sensor can be widely used for continuous measurement of the liquid level (boundary level): High temperature. High pressure. Viscous, dirty media. Asphalt, wax-containing oil products and flammable, explosive, corrosive media.

Float level sensor (float switch) is one type continuous level sensor for industrial level measurement. Float level sensor has a magnetic float that rises and falls as liquid level changes. The movement of the float creates a magnetic field. Through the magnetic coupling effect, the internal resistance of the sensor changes linearly. The resistance change is converted into a standard current signal of 4 ~ 20mA by an intelligent converter. The percentage of the liquid level, 4 ~ 20mA current and liquid level value, can be displayed on site. Applications like: water tank, fuel tank, level measurement and level control. Vertical, horizontal, and side mounted, all can be satisfied.

SI-U01 Float Level Sensor

Intelligent Solutions for High Temperature and Pressure

SI-512H High Temperature Pressure Sensor
SI-PT series Melt Pressure Sensors/Transducers – High Temperature
SI2088 High Temperature Pressure Transmitter/Transducer
SI-706 Combined Pressure and Temperature Sensor-Dual function
SI-702S Ultra High pressure transducer
SI-702 High Pressure Sensor
SI-SBW Field Mounted HART Temperature Transmitter
SI-WZP series RTD Temperature Transmitter

Related Blogs

Magnetic Level Gauge/Indicator

What is a magnetic type level gauge? A magnetic Level Gauge is also called a magnetic level indicator. Magnetic Level…

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

A wide variety of FMCW Radar High Temperature Level Sensors options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of FMCW Radar High Temperature Level measurement instrumentation, located in China.

Request a Quote

Please enable JavaScript in your browser to submit the form

Miniature Thermocouples–Smaller Than Armored Thermocouples

Posted on by

Miniature thermocouples are smaller than armored thermocouples. It has more advantages, such as: bending, high pressure resistance, fast thermal response time, sturdiness and durability, etc.

Miniature thermocouples are the same as armored thermocouples and assembled thermocouples. As a sensor for measuring temperature. They are usually used in conjunction with display instruments, recorders and electronic regulators. At the same time, miniature thermocouples can also be used as assembly thermocouples. Temperature sensing element. Temperature probes for applications with tight space requirements, limited access or other considerations. Typical miniature thermocouple applications include analytical instrumentation and medical devices.It is an indispensable temperature-measuring device in textile, tape and other industries.

It can directly measure the temperature of liquid, steam and gas medium and solid surface in the range of 0℃～600℃ in various production processes. are especially suitable for temperature measurement and control in narrow and bending places. Widely used in chemical, chemical fiber and pharmaceutical industries

Sino-Inst offers a variety of miniature thermocouple . If you have any questions, please contact our sales engineers.

CONTACT US
MORE PRODUCTS

Technical Parameters

  • Accuracy level: I or II [plus or minus 1.5 degrees below 375° is the first level standard. Plus or minus 2.5 degrees is the secondary standard]
  • Nominal diameter: Φ1 Φ0.5 Φ0.35 [generally the smallest outer diameter]

The Main Technical Parameters Of Miniature Thermocouples

  • Models and Specifications Accuracy grade: I or II
  • Nominal diameter: Φ1
  • Bending radius: R≥5D
  • Nominal pressure: normal pressure

About Temperature

The Celsius Temperature Scale (°C) Stipulates:

Under standard atmospheric pressure, the melting point of ice is 0°C, the boiling point of water is 100°C, and the middle is divided into 100 equal parts, each divided into 1°C, the symbol is °C.

The Fahrenheit Temperature Scale (℉) Stipulates:

Under standard atmospheric pressure, the melting point of ice is 32 degrees, the boiling point of water is 212 degrees, and the middle is divided into 180 equal parts, and each equal part is 1 degree Fahrenheit. The symbol is ℉.

The Thermodynamic Temperature Scale (symbol T)

The thermodynamic temperature scale (symbol T) is also called the Kelvin temperature scale (symbol K), or absolute temperature scale, which stipulates that the temperature when the molecular motion stops is absolute zero.

Principle Of Operation

In 1821, the German physicist Thomas Johann Seebeck discovered that when different metals are joined at the ends and there is a temperature difference between the joints, a magnetic field is observed. At the time, Seebeck referred to this consequence as thermo-magnetism. The magnetic field he observed was later shown to be due to thermo-electric current. In practical use, the voltage generated at a single junction of two different types of wire is what is of interest as this can be used to measure temperature at very high and low temperatures. The magnitude of the voltage depends on the types of wire being used. Generally, the voltage is in the microvolt range and care must be taken to obtain a usable measurement. Although very little current flows, power can be generated by a single thermocouple junction. Power generation using multiple thermocouples, as in a thermopile, is common.

Thermocouple from Wikipedia.

Model And Specifications Of Miniature Thermocouples

ModelGraduationRange of temperature measurement  ℃Thermal response timeMaterial for protective tube
WRE-203SE-40~250＜5S1Cr18Ni9Ti
WRE-204SE-40~250＜8S1Cr18Ni9Ti
WRE-205SE-40~250＜10S1Cr18Ni9Ti
WZP-203SPt100A -30-300       B -50-500＜5S1Cr18Ni9Ti
WZP-205SPt101A -30-300       B -50-500＜8S1Cr18Ni9Ti
WZP-206SPt102A -30-300       B -50-500＜10S1Cr18Ni9Ti

Extended reading:  Tri Clamp Sanitary Thermometers

Miniature Thermocouple Connectors

Standard and miniature connectors are used with thermocouples, extension wires and compensation cables. No false thermal EMFs are created in the connection. Uncompensated miniature copper connectors are also available.

All contacts are polarized. to ensure proper connection. And these connectors are fully compatible with RS thermocouples and thermocouple wiring products of the same type.

Uses: Suitable for thermocouple and RTD connectors.
Suitable for fine wire and mineral insulated cables.

Material
a) Thermoplastic (200℃)
b) Thermosetting (350℃)
C) Ceramic (650℃)

About Sheathed thermocouple: Sheathed thermocouple can directly measure the temperature of liquid, steam and gaseous media and solid surfaces in the range of 0℃～1200℃ in various production processes. Sheathed thermocouples are usually used along with display instruments, recording instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface in a variety of production processes within the range of 0 ~1300℃.

SI-WSS Back Connect Bimetal Thermometer
Stable And Reliable Sheathed Thermocouple
SI-WSS Adjustable Angle Bimetal Thermometer
SI-SBW Field Mounted HART Temperature Transmitter

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

Related Blog

Standard Platinum Rhodium Thermocouple

Standard Platinum Rhodium Thermocouple-Platinum Thermocouple Standard Platinum Rhodium Thermocouple is a temperature measurement standard device produced by our company. There…

RTD vs Thermocouple

RTD vs Thermocouple- What is the difference? What are they used for? Both RTDs and thermocouples are sensors used to…

Furnace thermocouple Topics

How does a furnace thermocouple work? In industrial furnaces, armored thermocouples are often used as Furnace thermocouples. The thermocouple body…

Type k thermocouple chart

A thermocouple chart is a practical tool for the electronic query of temperature index. It is used by technicians who…

Mechanical Water Flow Meters

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working…

Sino-Inst, Manufacuturer for Thermocouples, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermocouples, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Request a Quote

Please enable JavaScript in your browser to submit the form

SI-FMF13 FMCW Radar Water Level Sensor

Posted on by

Radar Water Level Sensor for Non-contact water level measurement. Two-wire system 4…20mA/HART protocol; four-wire system 4…20mA/RS485 Mod bus. Explosion-proof Exia ⅡC T6 Ga / Exd IIC T6 Gb.

Radar Water Level Sensor for Non-contact water level measurement. SI-FMF13 FMCW Radar Water Level Sensor is the ideal solution for measuring the water level in tank, dams, ponds, rivers, etc. The measuring range is up to 100 meters. IP67waterproof. Frequency modulated continuous wave radar level sensors antenna has been further optimized. The new and fast microprocessor can perform higher rate signal processing.

Sino-Inst offers a variety of FMCW Radar Water Level Sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Radar Level Sensors

Features of SI-FMF13 FMCW Radar Water Level Sensor

  • 120GHz (ISM standard band) distance detector based on the working principle of radar.
  • FMCW planar microstrip radar non-contact detection. Stable working all-weather.
  • The measurement error is less than ±1cm.
  • Radar antenna style: 11º×11º. Good directivity, low transmission loss.
  • Standard data communication interface (RS-232/RS-485) can be set.
  • Low power consumption, waterproof and lightning protection design. Suitable for various outdoor environments.
  • Small appearance. Easy to install and easy to maintain.

Specifications of SI-FMF13 FMCW Radar Water Level Sensor

Measuring medium:Liquid
Measuring range:0.1m~100m
Process connection:Flange≥DN80
Process temperature:-40～110℃
Process pressure:-0.1～0.3 MPa
Accuracy:±5mm (range between 35m-100m)
±2mm (range under 35m)
Protection level:IP67
Frequency Range:123GHz
power supply:Two-wire system (DC24V)/
four-wire system (DC12V~24V)/four-wire system (AC220V)
Explosion-proof grade:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Housing:Aluminum/plastic/stainless steel
Signal output:Two-wire system 4…20mA/HART protocol Four-wire system 4…20mA/RS485 Mod bus

Lake Water Level Sensor

Radar water level sensor monitors the water level of rivers, lakes, tidal water reservoirs and reservoirs.

Solution requirements:

The radar water level sensor monitors the water level of rivers, lakes, tidal water reservoirs and reservoirs. It is suitable for installation and use in areas that are not convenient for wiring due to corrosion, pollution, and flood-related water level collection.

Transmit a short microwave pulse, and then measure the elapsed time between pulse transmission and return. The running time of a few meters is measured in units of nanometers. Therefore, a special time conversion program is required to accurately measure these short time periods.

The elapsed time measurement is used to calculate the distance between the sensor and the target (for example, water, grain, slurry). The distance value can then be used to determine the depth of the medium.

Extended reading: Radar Non Contact Water Level Sensor

Technical Support:

Pulse radar level transmitters provide water level measurement based on directly measuring the running time of microwave pulses transmitted to and reflected from the surface of the river being measured. Using rs485 two-wire signal transmission, power supply and low power consumption are safe for outdoor use.

RS485 interface can be connected with 485 line, insert 4g sim card in dtu. 232 to usb to connect to the computer. Open the configuration tool and set the server address and port in the dtu configuration tool.

The server port monitors to receive the data, and it can be analyzed according to the sensor protocol. If the platform is developed to the modbus standard, the sensor also supports modbus. The whole analysis process will be simpler.

Realize remote monitoring and management of liquid level and water level outdoors. Both dtu and sensor industrial-grade outdoor design can be powered by solar energy. Therefore, radar water level gauges can be used in some of the most challenging water level applications.

Advantages:

  • dtu rs485 bus access. Multi-device access, support rs232 interface;
  • Strong compatibility. Can be connected to five-parameter water quality equipment. Multiple sensors use one gateway;
  • Installed on the shore of the water area, on the measuring frame or “extension arm”. Adjust the mounting bracket according to the terrain;
  • The installation is simple and the price is low. No need for expensive installation procedures;
  • Low power consumption power supply enables the equipment to operate independently in the most remote areas;
  • Non-contact measurement principle. Not damaged by silt accumulation or debris;
  • Wireless transmission, avoid the trouble of pulling cables. Install and use, remotely unattended;
  • High-level industrial requirements for the appearance of the iron shell. Application in hazardous areas and harsh environments;

Extended reading: Capacitive water level sensor

More Water Level Sensors

Sino-Inst offers a variety of water level sensors for a wide range of conditions. Our sensors are ideally suited for monitoring water levels in streams, dams, and reservoirs. Our water level sensor products include:

SI-151 Hydrostatic Level Sensor
SI-PCM261 Submersible Pressure Transducer
SI-PCM260 Deep Well Water Level Sensor
SI-FMF11 FMCW Radar Level Transmitter 120GHz
SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor
LR series Integral flange Magnetostrictive level sensor
LT series Digital Display Magnetostrictive liquid level sensor
Differential pressure(DP) level transmitter
ULT-100A Ultrasonic Level Transducer
ULT-200 Ultrasonic Level Detector
Portable Ultrasonic Liquid Level Indicator

Sino-Inst offers over 10 FMCW Radar Water Level Sensor for level measurement. About 50% of these are float liquid level meters, 40% is the Solid level sensors.

A wide variety of FMCW Radar Water Level Sensor options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of FMCW Radar Water Level Sensor instrumentation, located in China.

Request a Quote

SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor

Posted on by

Frequency modulated continuous wave radar also known as FMCW radar. Frequency modulated continuous wave radar level sensors antenna has been further optimized. The new and fast microprocessor can perform higher rate signal processing.

Frequency modulated continuous wave radar refers to continuous wave radar whose transmitting frequency is modulated by a specific signal. Radar is divided into two categories: pulse radar and continuous wave radar according to the type of transmitted signal. The signal emitted by Frequency Modulated Continuous Wave Radar can be single-frequency continuous wave (CW) or frequency-modulated continuous wave (FMCW). FMCW radar can be used for both range measurement and Speed ​​measurement, and the advantages in short-distance measurement are increasingly obvious.

Sino-Inst offers a variety of Frequency modulated continuous wave radar for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Radar Level Sensors

Features of FMCW Radar Level Sensor

  • 120GHz-130GHz FM wave radar. Terahertz radar used in industrial measurement field
  • 10GHz ultra-large FM scanning frequency width. Wide application range
  • 320*240dot TFT color LCD display. Easy to operate and friendly interface
  • Support standard HART, MODBUS, PROFIBUS bus protocol
  • Support multiple operation and configuration methods such as PC setting software, mobile phone APP, LCD keyboard module, tank side meter, etc.
  • 24VDC, 220VAC two power supply models
  • Simple installation structure. Adapt to various installation forms on site

Specifications of SI-FMF12 FMCW Radar Level Sensor

Measuring medium:Liquid
Measuring range:0.05m~35m
Process connection:G2A thread/flange≥DN65
Process temperature:-40～110℃
Process pressure:-0.1～1.6 MPa
Accuracy:±2mm
Protection level:IP67
Frequency Range:IP67
power supply:Two-wire system (DC24V)/four-wire system (DC12V~24V)/four-wire system (AC220V)
Explosion-proof grade:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Housing:Aluminum/plastic/stainless steel
Signal output:Two-wire system 4…20mA/HART protocol Four-wire system 4…20mA/RS485 Mod bus

Extended Reading: Influence of Dielectric Constant on Liquid Level Measurement | Radar-Guided Wave Radar Level Meter

Frequency modulated continuous wave radar pros

120GHz-130GHz FM wave FMCW radar product (also called THz terahertz radar).
It uses a higher frequency THz band than Ku-band radar.

It has important applications in remote target detection, strong smoke and dust environment, long-distance imaging, multi-spectral imaging, etc. And can detect smaller targets than microwave radar and achieve more precise positioning. With higher resolution and stronger confidentiality.

What are terahertz (THz) electromagnetic waves?

It refers to electromagnetic waves and electromagnetic radiation with electromagnetic wave frequency between 100GHz ~ 10,000GHz (10THz).

This band is the area that humans have the least understanding and application development so far. Terahertz lies between mid-infrared and microwave on the electromagnetic spectrum, and represents the transition stage from quantum mechanism transmission theoretical physics to classical mechanism transmission theoretical physics.

1THz(=1000GHz) The wavelength of electromagnetic wave is 300um (0.3mm is about the diameter of human hair)

Difference between CW radar and FMCW radar

Radars are divided into pulse radars and continuous wave radars according to the types of transmitted signals. Conventional pulse radar emits periodic high-frequency pulses. Continuous wave radar emits continuous wave signals.

The signal emitted by continuous wave radar can be single frequency continuous wave (CW) or frequency modulated continuous wave (FMCW). There are also many ways of frequency modulation. The common ones are triangle wave, sawtooth wave, code modulation or noise frequency modulation.

Among them, the single-frequency continuous wave radar (CW) can only be used for speed measurement, not distance measurement. The FMCW radar can measure both range and speed, and its advantages in short-range measurement are becoming increasingly obvious.

From Wikipedia, we can learn more about Continuous-wave radar.

Frequency Modulated Continuous Wave Radar Working Principle

FM wave radar level sensor and distance formula:

Among them: C speed of light; fd Doppler frequency shift; fu triangle rising edge difference frequency; f0 FM initial frequency; T signal period; B signal bandwidth

The distance resolution depends on the frequency resolution of the DFT operation (Frequency Resolution). The frequency resolution of the DFT Fres is equal to:

①

T is the corresponding sampling time of the non-zero sampling value used for the DFT operation. If you use FFT + zero padding method to calculate the spectrum. T is the time corresponding to the sampled value of the non-zero-filled point.

The distance corresponding to the frequency resolution Fres is the range resolution Sres of the radar. Then, how to calculate the range resolution of the FMCW radar?

B: Frequency modulation width, unit Hz

T: Actual frequency modulation, in seconds

C: Speed of light, 3*10^8 meters/second

S: the distance between the radar and the object, meters

V: Frequency modulation speed, Hz/sec

t: wave propagation time, sec

V=BW/T  ②

t= 2S/C   ③

Assume that T is sampling during the entire frequency modulation period. And all sampling points are used for DFT calculation. According to ④ and ①,

which is

This is the calculation formula for the minimum range resolution that FMCW can obtain when the frequency modulation bandwidth is determined.

In actual use, the sampling time will be slightly shorter than the actual frequency modulation T. That is, Fres will be larger in value. So Sres will also become larger in value.

FMCW vs Pulse radar

VEGAPULS has a good explanation video about PULSE and FMCW technology | Radar level measurement. Let’s take a look together.

Video source: https://www.youtube.com/watch?v=eAngy1B1FP

Pulse Radar

Pulse radar is a precision tracking radar. Each time it emits a pulse, the antenna can form several beams at the same time, and compare the amplitude and phase of the echo signal of each beam.

When the target is located on the antenna axis, the amplitude and phase of the echo signal of each beam are equal, and the signal difference is zero.

When the target is not on the antenna axis, the amplitude and phase of the echo signals of each beam are not equal, resulting in signal difference.

Drive the antenna to the target until the antenna axis is aligned with the target, so that the high and low angle and azimuth angle of the target can be measured.

The sum of the signals received by each beam can measure the distance of the target. In order to realize the measurement and tracking of the target.

FMCW

FM continuous wave radar refers to a continuous wave radar whose transmitting frequency is modulated by a specific signal, such as weather radar.

FM continuous wave radar obtains the distance information of the target by comparing the difference between the frequency of the echo signal at any time and the frequency of the transmitted signal at that time.

The distance is proportional to the frequency difference between the two. The radial velocity and distance of the target can be obtained by processing the measured frequency difference between the two.

Compared with other range and speed measurement radars, the structure of FM continuous wave radar is simpler.

FMCW radar has rich technical experience, low transmit power peak required, easy modulation, low cost, and simple signal processing, so it is a commonly used radar system in automotive radars.

LFMCW radar, i.e., the carrier signal frequency changes linearly with time.

FAQ

What is frequency modulated continuous wave?

FM continuous wave radar refers to a continuous wave radar whose transmitting frequency is modulated by a specific signal.
The principle of frequency modulated continuous wave (FMCW) radar is to send a continuous signal with a certain bandwidth and linear change in frequency, and then perform fast Fourier transform on the received continuous signal.
The time difference between the two signals is calculated by the frequency difference between the sending and receiving signals. Finally, like the pulse wave radar level meter, the corresponding distance value is obtained from the time difference.
FMCW radar can obtain very high accuracy, and its accuracy mainly depends on the linearity and temperature drift of the voltage controlled oscillator.

What does continuous wave mean?

A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, typically a sine wave, that for mathematical analysis is considered to be of infinite duration.

What does Fmcw stand for?

FMCW is short for Frequency Modulated Continuous Wave.

Sino-Inst offers over 10 FMCW Radar Level Transmitters for level measurement. About 50% of these are float liquid level meters, 40% is the Solid level sensors.

A wide variety of FMCW Radar Level Transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of FMCW Radar Level Transmitters instrumentation, located in China.

Request a Quote

Please enable JavaScript in your browser to submit the form

SI-FMF11 FMCW Radar Level Transmitter 120GHz

Posted on by

FMCW Radar Level Transmitter with 120GHz fmcw, IP67 anti, can carry out 0.05m~30m Non-contact level measurement.

FMCW Radar Level Transmitter with 120G fmcw, IP67 anti, can carry out 0.05m~30m level measurement.
FMCW Radar Level Transmitter is based on the principle of FM continuous wave. FMCW refers to frequency modulated continuous wave. Use chirp high frequency signal.
120GHz FMCW Radar Level Transmitter, measuring distance up to 30 meters. The antenna is further optimized. The new and fast microprocessor can perform higher rate signal analysis and processing. The Radar Level Transmitter can be used for measuring high temperature and high pressure and other environmental liquids.

Sino-Inst offers a variety of FMCW Radar Level Transmitters for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Radar Level Sensors

Features of SI-FMF11 FMCW Radar Level Transmitter

  • Millimeter wave radar. The measurement accuracy is up to ±2mm. The minimum blind area for measurement is 0.05m.
  • The smaller antenna size satisfies the measurement of more working conditions.
  • Multiple lens antennas. Smaller launch angle. More concentrated energy. Stronger echo signal. Under the same working conditions, it has higher reliability than other radar products.
  • It has stronger penetrability. It can be used normally in the case of adhesion and condensation.
  • Larger dynamic signal range. The measurement of low-dielectric constant medium is more stable.
  • Multiple measurement modes. The radar response time in fast measurement mode is less than 1s.

Specifications of SI-FMF11 FMCW Radar Level Transmitter

Measuring medium:Liquid
Measuring range:0.05m~30m
Process connection:G1 ½A/1½NPT thread/flange≥DN50
Process temperature:-40～80℃
Process pressure:-0.1～0.3 MPa
Accuracy:±2mm
Protection level:IP67
Frequency Range:123GHz
power supply:Two-wire system (DC24V) / Four-wire system (DC12V~24V) / Four-wire system (AC220V)
Explosion-proof grade:Exia ⅡC T6 Ga / Exd IIC T6 Gb
Housing:Aluminum/plastic/stainless steel
Signal output:Two-wire system 4…20mA/HART protocol Four-wire system 4…20mA/RS485 Mod bus

FMCW Radar Level Transmitter 120GHz Applications

Solid measurement

  • Powder
  • Granule
  • Block
  • ※ Low dielectric constant plastic particles

Liquid measurement

FMCW

What does Fmcw stand for?

FMCW, namely Frequency Modulated Continuous Wave.

FMCW technology and pulse radar technology are two technologies used in high-precision radar ranging. The basic principle is that the transmitted wave is a high-frequency continuous wave. Its frequency changes with time according to the law of triangle wave.

FMCW (Frequency Modulated Continuous Wave), the received echo frequency and the transmitted frequency change law are the same, both are triangular waves. There is only a time difference. Using this tiny time difference, the target distance can be calculated.

Extended Reading: Case: High Temperature Radar Level Transmitter for Melted Salt-Solar Photovoltaic Power Station

FMCW Radar Level Transmitter Working Principle

FM wave radar level sensor and distance formula:

Among them: C speed of light; fd Doppler frequency shift; fu triangle rising edge difference frequency; f0 FM initial frequency; T signal period; B signal bandwidth

The distance resolution depends on the frequency resolution of the DFT operation (Frequency Resolution). The frequency resolution of the DFT Fres is equal to:

 

①

T is the corresponding sampling time of the non-zero sampling value used for the DFT operation. If you use FFT + zero padding method to calculate the spectrum. T is the time corresponding to the sampled value of the non-zero-filled point.

The distance corresponding to the frequency resolution Fres is the range resolution Sres of the radar. Then, how to calculate the range resolution of the FMCW radar?

B: Frequency modulation width, unit Hz

T: Actual frequency modulation, in seconds

C: Speed of light, 3*10^8 meters/second

S: the distance between the radar and the object, meters

V: Frequency modulation speed, Hz/sec

t: wave propagation time, sec

V=BW/T  ②

t= 2S/C   ③

Assume that T is sampling during the entire frequency modulation period. And all sampling points are used for DFT calculation. According to ④ and ①,

which is

This is the calculation formula for the minimum range resolution that FMCW can obtain when the frequency modulation bandwidth is determined.

In actual use, the sampling time will be slightly shorter than the actual frequency modulation T. That is, Fres will be larger in value. So Sres will also become larger in value.

LFMCW, FMCW and Pulse radar

Radar (Radio detecting and ranging) means radio search and ranging. It is a device that uses various radio positioning methods to detect and identify various targets, determine target coordinates and other information.

In modern military and production, the role of radar is increasingly showing its importance. Especially in the Second World War, the “British” air battle between the British Air Force and the Luftwaffe made the importance of radar very clear.

The radar is composed of antenna system, transmitting device, receiving device, anti-interference equipment, display, signal processor, power supply and so on. Among them, the antenna is one of the key technologies for radar to achieve large airspace, multi-function, and multi-target. The signal processor is one of the core components of the radar with multi-function capabilities.

There are many types of radars, which can be classified in many ways:
(1) According to the positioning method, it can be divided into: active radar, semi-active radar and passive radar.
(2) According to the installation location, it can be divided into: ground radar, shipborne radar, aviation radar, satellite radar, etc.
(3) According to the type of radiation, it can be divided into: pulse radar and continuous wave radar.
(4) According to the work, it can be divided into long wave bands: meter wave radar, decimeter wave radar, centimeter wave radar and other wave band radars.
(5) According to the purpose, it can be divided into: target detection radar, reconnaissance radar, weapon control radar, flight support radar, weather radar, navigation radar, etc.

Pulse Radar

Pulse radar is a precision tracking radar. Each time it emits a pulse, the antenna can form several beams at the same time, and compare the amplitude and phase of the echo signal of each beam.

When the target is located on the antenna axis, the amplitude and phase of the echo signal of each beam are equal, and the signal difference is zero.

When the target is not on the antenna axis, the amplitude and phase of the echo signals of each beam are not equal, resulting in signal difference.

Drive the antenna to the target until the antenna axis is aligned with the target, so that the high and low angle and azimuth angle of the target can be measured.

The sum of the signals received by each beam can measure the distance of the target. In order to realize the measurement and tracking of the target.

FMCW

FM continuous wave radar refers to a continuous wave radar whose transmitting frequency is modulated by a specific signal, such as weather radar.

FM continuous wave radar obtains the distance information of the target by comparing the difference between the frequency of the echo signal at any time and the frequency of the transmitted signal at that time.

The distance is proportional to the frequency difference between the two. The radial velocity and distance of the target can be obtained by processing the measured frequency difference between the two.

Compared with other range and speed measurement radars, the structure of FM continuous wave radar is simpler.

FMCW radar has rich technical experience, low transmit power peak required, easy modulation, low cost, and simple signal processing, so it is a commonly used radar system in automotive radars.

LFMCW radar, i.e., the carrier signal frequency changes linearly with time.

80G radar level sensor refers to frequency modulated continuous wave (FMCW) radar products working at 76-81GHz. It supports four-wire and two-wire applications. The large range of the product can reach 150m. The blind area can reach 8cm.

Because of its higher operating frequency and shorter wavelength, it is especially suitable for solid-state applications. It transmits and receives electromagnetic waves through a lens. It has unique advantages in high dust and harsh temperature environments (+200°C).

The main advantages of 80G high frequency radar level sensor are as follows:

  1. Based on self-developed CMOS millimeter-wave radio frequency chip. Realize a more compact radio frequency architecture. Higher signal-to-noise ratio and smaller blind area.
  2. Narrow 3° antenna beam angle. The interference in the installation environment has less influence on the instrument, and the installation is more convenient.
  3. The wavelength is shorter. It has better reflection characteristics on the solid surface. Therefore, there is no need to use a universal flange for aiming.
  4. Support remote debugging and remote upgrade. Reduce waiting time. Improve work efficiency.
  5. Support mobile phone Bluetooth debugging. It is convenient for on-site personnel to maintain work.
Alternative to VEGAPULS 64-80GHz FMCW Level Radar

VEGAPULS 64 is a radar sensor for continuous level measurement of liquids. VEGA is the world’s leading manufacturer of radar level sensors. 80GHz radar level gauge VEGAPULS 64 has excellent performance.

Following VEGA, Sino-Inst also launched radar level sensor operating at 76-81 GHz.

SIRD-905 Horn Antenna Radar Tank Level Sensor

The radar level sensor is divided according to the antenna type. There are the following types:
Cone antenna, parabolic antenna, horn antenna, long horn antenna.

The horn antenna adopts the working method of transmitting radar waves from a single point.
After the reflection of the horn surface, a divergent radar wave is formed. Usually used to measure the level of the vaulted tank that does not require a conduit. The measurement distance is smaller than that of a parabolic antenna.

Since the entire horn antenna extends into the tank, there is no big difference with the temperature in the tank. Therefore, there is basically no condensation on the antenna.

Guided wave radar level transmitter uses guided wave radar (GWR) technology. Based on the reflection of microwave on the surface medium. Through the probe, continuous level measurement of liquid and solid levels is completed.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Extended reading: guided wave radar level sensor advantages and disadvantages

Ultrasonic Level Sensing sensors and transmitters are used for continuous, non-contact level measurement.

Ultrasonic Level Sensing is a low-cost liquid level measurement technology. Ultrasonic Level Sensing sensors and transmitters are used for tank or river level measurement. Ultrasonic Level Sensing does not need to contact the medium, can be continuously measured, low cost. Therefore, Ultrasonic Level Sensing is very popular among users. Ultrasonic liquid level sensors are available in general and intrinsically safe types. Output 4~20mA standard signal or output the measurement result to the secondary meter through RS-485. Meets the system’s automatic control.

More Featured Radar Level Transmitter

SI-FMF11 FMCW Radar Level Transmitter 120GHz
SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor
SI-FMF13 FMCW Radar Water Level Sensor
SI-FMF15 FMCW Radar High-Temperature Level Sensor
SI-FMF21 FMCW Radar Silo Level Sensor
64-80GHz FMCW Level Radar
SIRD-901 Radar Corrosive Liquid Chemical Level Sensor
SIRD-902 Drop Antenna Radar Tank Level Sensor
SIRD-902T Microwave Radar Liquid Level Sensor
SIRD-903 26 GHz Radar level Sensor -Dust solid level measurement
SIRD-904 Radar Level Gauge with Parabolic Antenna
SIRD-906 Radar Sanitary Level Sensor

Frequently
Asked
Questions

Help Center

Radar level transmitter is an advanced non-contact measuring instrument. It is suitable for solid materials, process containers or strong dusts that are prone to crystallization and condensation. It has the advantages of low maintenance, high performance, high precision, high reliability and long service life.

It can adapt to harsh production environments such as high temperature, high pressure and steam. Even under extreme process conditions (pressure, temperature) and steam. Radar level measurement is also a safe solution.

Radar level transmitters can also be used in hygienic applications for non-contact level measurement.

Radar level transmitter versions can be used in different industries such as water/wastewater, food industry, life sciences or process industries.

Various antenna versions are available for various radar applications.

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.

The radar is calibrated before leaving the factory. The wall can be tested before installation. The measured distance matches the measured distance.

There is also a test method, which is to send the 4-20mA value in the programmer to see if it is consistent with the value in the control room. After the test is completed, it will return to the normal test state from the power off.

Different settings in various mines.
Such as water, set it to liquid in the settings. There is almost no need to set other parameters.
If it is powder, then set the solid, cutting speed, material change, etc.
Adjust the universal joint flange;

Sino-Inst offers over 10 FMCW Radar Level Transmitters for level measurement. About 50% of these are float liquid level meters, 40% is the Solid level sensors.

A wide variety of FMCW Radar Level Transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of FMCW Radar Level Transmitters instrumentation, located in China.

Request a Quote

Stable And Reliable Sheathed Thermocouple

Posted on by

Sheathed thermocouple have the advantages of bending, high pressure resistance, fast thermal response time and durability.

Sheathed thermocouple can directly measure the temperature of liquid, steam and gaseous media and solid surfaces in the range of 0℃～1200℃ in various production processes.

Sheathed thermocouples are usually used along with display instruments, recording instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface in a variety of production processes within the range of 0 ~1300℃.

Sino-Inst offers a variety of Sheathed Thermocouple . If you have any questions, please contact our sales engineers.

CONTACT US
MORE PRODUCTS

Advantages

  1. Less thermal response time,which can reduce the dynamic error.
  2. Flexible mounting for use.
  3. Wide measuring scope.
  4. High mechanical strength and good pressure resistance.

There are actually many techniques for using sheathed thermocouples.

  • It has bendable performance. The thermal resistance of the sheath can be bent in any direction . except for the head, so it is suitable for the temperature of the complicated structure and small equipment.
  • The sheathed thermocouple has good vibration and impact resistance. Therefore, its life is longer than ordinary thermal resistance.
  • The sheathed thermocouple has a long service life. Because the resistance body of the sheathed thermal resistance is maintained by the metal sleeve, the thermal resistance wire is not easily corroded by harmful media.
  • It is suitable for measuring in strong alkali and corrosive medium. with a temperature resistance of 250℃, and the fixed installation situation can also use the same PTFE fixed thread.
  • According to the measurement temperature range and side measurement object, select the appropriate thermal resistance model, specification and maintenance tube information.

What Is Sheathed Thermocouple?

Sheathed thermocouples consist of an outer metallic sheath, which contains the insulated internal leads, embedded within a high-density ceramic compound (mineral-insulated cable, also called MI cable). Sheathed thermocouples are bendable and may be bent to a minimum radius of five times the sheath diameter.

Learn more about Thermocouple from Wikipedia.

What Are The Types Of Sheathed Thermocouple?

Sheathed thermocouples have different types. Type J, K, T, & E are “Base Metal” thermocouples, the most common types of thermocouples. Type R, S, and B are “Noble Metal” thermocouples, which are used in high temperature applications (see thermocouple temperature ranges for details)

ModelGraduationRange of temperature
 measurement ℃ —–I		Tolerance value—-IRange of temperature
measurement ℃—II		Tolerance value—-II
WRNKK-40~+375±1.5℃-40~+333±2.5℃
WRNKK375~1000±0.004ltl333~1200±0.0075ltl
WRNKN-40~+375±1.5℃-40~+333±2.5℃
WRNKN375~1000±0.004ltl333~1200±0.0075ltl
WRNKE-40~+375±1.5℃-40~+333±2.5℃
WRNKE375~800±0.004ltl333~900±0.0075ltl
WRNKJ-40~+375±1.5℃-40~+333±2.5℃
WRNKJ375~750±0.004ltl333~750±0.0075ltl
WRNKT-40~+125±0.5℃’-40~133±1.0℃
WRNKT125~350±0.004ltl133~350±0.0075ltl
WRNKS0~+1100±1.0℃0~600±1.5℃
WRNKS1100~1600±[1+0.003(t-1100)]600~1600±0.0025ltl
WRNKR0~1000±1.0℃0~600±1.5℃
WRNKR1100~1600±[1+0.003(t-1100)]600~1600±0.0025ltl
WRNKB————600~1700±0.0025ltl
WRNKB———————

Extended reading:  Tri Clamp Sanitary Thermometers

Can You Overheat a Sheathed Thermocouple?

  • In terms of the sheath thermocouple, the environment temperature is 20 + 15℃, the relative humidity is not more than 80%, the test voltage is 500 + 50V(DC), the insulation resistance between electrode and outer sleeve≥1000MΩ.m.
  • That is to say, the insulation resistance for sample of 1m is 1000MΩ;
  • the insulation resistance for sample of 10m is 100MΩ.

Sheathed Thermocouple’s Working Principle

The electrode of sheath thermocouple are consisted by two different materials of conductor. When there is a temperature difference between the measuring end and the reference end, it will generate the thermal electric potential. The working instrument will show the corresponding temperature value of the thermal electric potential.

How Do You Identify A Sheathed Thermocouple?

If the flame ignites and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction. Before jumping to the conclusion that the thermocouple is at fault, look at the pilot flame.

More Featured Temperature Transmitters

SI-WSS Back Connect Bimetal Thermometer
SI-WSS Bottom Connect Bimetal Thermometer

Request a Quote

Please enable JavaScript in your browser to submit the form

External Ultrasonic Tank Level Sensor

Posted on by

The external ultrasonic tank level sensors is the first choice for measuring liquid level and material level on various industrial tanks.

The intelligent ultrasonic tank level sensor installs the ultrasonic probe directly under the tank when measuring. No need to open holes, easy to install. Does not affect on-site production. It can measure various toxic substances and pure liquids in high temperature and high pressure airtight containers. The instrument adopts explosion-proof design to meet explosion-proof requirements. The Internet of Things can be realized through GPRS and Wifi.

Sino-Inst offers a variety of  ultrasonic level meters for tank level measurement. If you have any questions, please contact our sales engineers.

Request a Quote
Ultrasonic level Meters

Features of External Ultrasonic Tank Level Sensor

  • The probe is external, no need to open a hole to the container under test.. Really realize non-contact measurement.
  • It is suitable for accurate measurement of the liquid level of toxic, volatile, flammable, explosive, and highly corrosive liquid media in various closed containers.
  • The instrument has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area.
  • The instrument has built-in ASIC (Intelligent Ultrasonic Special Hardware Integrated Circuit), which makes the instrument small in size, stable and reliable in measurement results. It can be suitable for all kinds of liquids and containers to be tested, and it is easy to install on site without complicated on-site calibration.
  • The instrument has built-in various calibration functions such as automatic temperature correction and automatic fixed distance calibration. The measurement results are more accurate and reliable.
  • The instrument has complete functions, with RS485 output, 4-20mA output, and switch output.
  • Multiple power supply methods available
  • Backup and restore configuration parameters
  • The analog output can be adjusted arbitrarily
  • With digital filtering and echo recognition functions
  • Fixed interference filtering function can be manually set
  • Support Bluetooth, GPRS communication, GPS satellite positioning, etc. (Order to buy)
  • Support custom serial data format
  • Support custom main display interface
  • Support MiniSD card data collection (order option)

Extended reading: The Secret of Ultrasonic Level Measurement

Technical Parameter of External Ultrasonic Tank Level Sensor

Range1m, 3m, 5m, 8m, 10m, 15m, 20m, 25m, 30m
Accuracy±1mm-±0.3%FS
different from the sensor, too thick tank wall, unstable pressure and temperature may affect accuracy
DisplayChinese and English large screen LCD, color screen TFT (optional)
Display resolution1MM
Output4～20mA (maximum load 350Ω), RS485, switch value, TF card, GPRS, GPS
Power supplyDC12-24V or AC220V
Shell materialcast aluminum
Protection levelIP65
Probe materialABS
Installation methoddirect magnetic adsorption or adhesive transfer sheet (ferromagnetic), then magnetic adsorption
Sensor outlet cablewith standard 10M (optional length, optional sensor cable sheath)
Dimensionshost 230X210X129/135X180X86
Electrical interface specificationM20X1.5
Diameter of threading hole5-15mm
MaterialCopper plating
Power inlet cable10m (optional length)
Ambient temperature of the host-20℃~+70℃
The ambient temperature of the ultrasonic probe-40℃～+100℃
Humidity15%～100% RH

Extended reading: Guide to Ultrasonic Level Transmitters

Application Industry:

  1. Pharmaceutical manufacturing industry: liquid level control of reaction liquid in pipelines and storage tanks, etc.
  2. Petrochemical industry: oil pipeline, internal liquid level control of storage tanks, etc.
  3. Food industry: liquid level detection and monitoring projects in brewing, beverage, milk production, storage tanks, pipelines, etc.

Read more about: 7 Level Senors for Tank Level Measurement

Application Conditions:

Media Purity

the liquid cannot be filled with dense bubbles. A large amount of solids, such as crystals, cannot be suspended in the liquid.The bottom of the container cannot deposit a large amount of sand and sediment.

Medium Viscosity

When the dynamic viscosity is less than 10mPaS, it is measured normally. When 10mPaS<dynamic viscosity<30mPaS, the range of the instrument may be reduced. It cannot be measured when the dynamic viscosity is >30mPaS.

note: As the temperature increases, the viscosity decreases, and most high-viscosity liquids are more affected by temperature. Therefore, pay attention to the effect of liquid temperature when measuring viscous liquids.

Container Under Test

  1. Material: The container wall where the measuring probe is installed is required to be made of hard materials that can transmit signals well. Examples: carbon steel, stainless steel, various hard metals, glass steel, hard plastics, ceramics, glass, hard rubber and other materials or their composite materials. If the container wall where the measuring probe is installed is of multilayer material, the layers should be in close contact with no bubbles or gas interlayers. The inner and outer surfaces of the container wall should be flat. Examples: vulcanized hard rubber lining, stainless steel lining, titanium lining Floor.
  2. Wall thickness: 1-100mm
  3. Tank type: spherical tank, horizontal tank, vertical tank, etc.

Probe Installation Requirements:

  1. For iron containers, you can apply silicone grease to the working end of the probe and stick it directly to the bottom of the container with a magnetic suction cup; if the container shell is made of glass or other materials, you can use glue to fix the probe or use a bracket to fix it. The bottom of the container. The probe point must be on the same straight line as the measured distance.
  2. There are no obstructions such as coils directly above the probe;
  3. Keep away from the liquid inlet at the bottom of the tank to avoid the influence of the violent flow of the liquid on the measurement;
  4. Keep away from the position below the liquid inlet on the top of the tank to avoid the impact of the liquid inlet and the violent fluctuation of the liquid level to affect the measurement;
  5. It is higher than the liquid outlet or the sewage outlet to avoid the influence of long-term deposits on the bottom of the tank on the measurement. If the conditions are not met, measures should be taken to ensure that the bottom of the tank is regularly removed;
  6. When the liquid level measuring head is installed by magnetic or welding/adhesive fixing method, the installation surface size on the container wall should not be less than the round surface of Ф80, the surface roughness should reach 1.6, and the inclination should be less than 3°(bypass pipe exce

What Is External Ultrasonic Tank Level Sensor?

Ultrasonic level meter is a high-tech product that integrates ultrasound, electronics and software. The various indicators of the ultrasonic level meter have reached the advanced level of similar products in the world. and it is the first-choice instrument for measuring liquid level and material level on various industrial sites.

How Do External Ultrasonic Tank Level Sensors Work?

Install the ultrasonic probe directly below the outer wall of the container under test. No need to open holes, easy to install, and does not affect on-site production. It can accurately measure various toxic substances and various pure liquids in high temperature and high pressure airtight containers.The instrument has built-in ASIC (Intelligent Ultrasonic Special Hardware Integrated Circuit), which makes the instrument small in size, stable and reliable in measurement results, and can be suitable for various liquids and containers to be tested. It is easy to install on site and does not require complex on-site calibration.

The instrument has built-in various calibration functions such as automatic temperature correction and automatic fixed distance calibration to make the measurement results more accurate and reliable. The Internet of Things can be realized through GPRS and Wifi.

How Do You Mount An External Ultrasonic Tank Level Sensor?

The probe is installed externally, no need to open a hole in the container to be tested, and truly realize non-contact measurement.It is suitable for accurate measurement of the liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers.The instrument has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area.

What Are The Benefits?

  1. Safe : No valves, connecting pipes, joints, no leaks, no contact with the liquid and gas in the tank, very safe, when measuring toxic, corrosive, pressure, flammable, volatile, and easy to leak liquids
  2. Hygiene: liquid level detection and monitoring projects in brewing, beverages, milk production, storage tanks, pipelines, etc. do not come in contact with liquids and cause pollution.
  3. Convenient installation and maintenance: no fire or tank cleaning during installation and maintenance will not affect production.

Read more: Guide: Non-contact Ultrasonic Level Sensing transmitters

When measuring the External Ultrasonic Tank Level Sensor, install the ultrasonic probe directly under the outer wall (bottom) of the container under test. No need to open holes, easy to install, and does not affect on-site production. It can be used to treat various toxic substances in high temperature and high pressure airtight containers. Accurate measurement of a pure liquid.

The External Ultrasonic Tank Level Sensor adopts explosion-proof design to meet explosion-proof requirements. The probe is installed externally, no need to open a hole in the container to be tested, real non-contact measurement, suitable for accurate liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers measuring.

The External Ultrasonic Tank Level Sensor has no mechanical moving parts and has a long life. No corrosion, no pollution, wide use area. More about Top 5 Ultrasonic Level Sensor Applications.

In the design work, a reasonable and optimized External Ultrasonic Tank Level Sensor selection scheme was made according to each project. Judging from the production and application, the effect is very good.

1.Field application of butadiene

In a rubber project, it is necessary to measure the level of butadiene in the spherical tank. Butadiene is prone to self-polymerization to produce high molecular polymers, and the selection of ordinary liquid level meters is limited. According to the requirements of “Tank Area Automation System Design Regulations”, “Each pressure storage tank should be equipped with two sets of independent and different types of liquid level measuring instruments”. If the conventional contact liquid level gauge is selected for this project, butadiene is at the dead corner of the detection port The possibility of self-aggregation is very large, so the non-contact type should be given priority to the selection of the level gauge. Finally, a set of non-contact radar level gauges were installed on the top of the tank, and a set of External Ultrasonic Tank Level Sensors were installed on the bottom of the tank. After the field application, the externally attached ultrasonic level gauge measures accurately and the effect is very good.

2.Field application of liquid ammonia

In the design of a certain liquid ammonia spherical tank, the External Ultrasonic Tank Level Sensor also has a good application. The liquid ammonia in the storage tank is a colorless, pungent odor and toxic liquid, which is corrosive to a certain extent. Because the density of liquid ammonia is greatly affected by temperature, the differential pressure level gauge is not applicable in this project, and the external ultrasonic level gauge is finally used for detection.

3.Field application of high pressure storage tank

In a high-pressure hydrogenation plant, due to the unstable parameters of the original level gauge on the high-pressure storage tank, the owner wanted to add a level gauge to compare with it. However, the installation space of the high-pressure vessel was small on site, and the conditions for reopening were not available. After negotiation, it was decided to adopt an external ultrasonic level gauge, which not only avoided the economic loss caused by the shutdown of the device, but also prevented new pressure vessels. Increase the safety hazards of leakage points, simple installation, accurate and reliable, can be described as three birds with one stone.

4.Ultrasonic sensor for Oil/fuel level measurement

The External Ultrasonic Tank Level Sensor adopts explosion-proof design to meet explosion-proof requirements. The probe is installed externally, no need to open a hole in the container to be tested, real non-contact measurement, suitable for accurate liquid level of toxic, volatile, flammable, explosive, strong pressure, strong corrosive and other liquid media in various closed containers measuring. Therefore, the External Ultrasonic Tank Level Sensor is the best level measurement sensor for diesel, gasoline and other oil tanks. More about Diesel Fuel Level Sensor Types.

5. Other field applications

The External Ultrasonic Tank Level Sensor can be a good substitute for radar level gauges in some occasions where the dielectric constant is low, such as liquefied gas (dielectric constant <1.9) or the liquid surface contains a lot of bubbles and other radar level gauges are not suitable for use; For some highly corrosive acid and alkali storage tanks, such as liquid chlorine storage tanks, the External Ultrasonic Tank Level Sensor is also very useful.

External Ultrasonic Tank Level Sensor common available media include liquid chlorine, liquefied gas, liquid ammonia, ethylene, butadiene, gasoline, diesel, benzene, liquid bromine, hydrochloric acid, lye, nitric acid, methanol, vinyl chloride, hydrofluoric acid, ethylene Glycol, propane, naphtha, ethylene oxide, dimethyl ether.

Extended reading: ultrasonic level sensor for diesel tank

Can External Ultrasonic Tank Level Sensors Detect Water Level?

Ultrasonic liquid level sensor can be used for water level measurement. The principle of ultrasonic reflection used. According to the contact between the sound wave emitted by the pool ultrasonic liquid level gauge and the liquid surface. According to the length of time it reflects back. To measure the height of the liquid level in the tank.
Liquid level sensors are used in many sites to detect some conditions that require liquid level monitoring. It is well known that the liquid level of some sewage treatment tanks, the liquid level on the tank, the liquid level on the river channel and so on.

What is an ultrasonic level sensor?

Ultrasonic level sensor is a monitoring instrument for measuring liquid height, tank height, and material position.

Ultrasonic level sensor can adopt two-wire, three-wire or four-wire technology.

The two-wire system is: power supply and signal output are shared.
The three-wire system is: the power supply circuit and the signal output circuit are independent. When using DC 24v power supply, a 3-core cable can be used, and the negative terminal of the power supply and the negative terminal of the signal output share a core wire.
The four-wire system is: when using AC 220v power supply, or when using DC 24v power supply, when the power supply circuit and the signal output circuit are required to be completely isolated, a 4-core cable should be used.
DC or AC power supply, 4~20mADC, high and low switch output.

More about Ultrasonic Level Sensing Technology.

What are the different types of level sensors?

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

  • Capacitance Level Transmitters
  • Hydrostatic Level Transmitters
  • Magnetic Level Transmitters
  • Radar Fill Level Transmitters
  • Ultrasonic Level Transmitter
  • Guided Microwave Level Transmitters
  • Liquid Level Transmitters

Read More About: Explosion Proof Ultrasonic Level Sensors Operating Principle.

Related products and technologies

Portable Ultrasonic Liquid Level Indicator
HS-2000 Ultrasonic Tank Level Sensor-External Mounted
HS-ULC Ultrasonic Level Switch-External Mounted
HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller
ULT-100A Ultrasonic Level Transducer
ULT-100 Ultrasonic Level Indicator
ULT-200A Ultrasonic fuel tank level sensor
SIRD-804 Radar Solid Level Sensor
SI-U01 Float Level Sensor
SIRD-905 Horn Antenna Radar Tank Level Sensor

More Tank Level Measurement Solutions

Read more about: Ultrasonic Level Sensors for Liquids Applications

Sino-Inst offers over 10 External Ultrasonic Tank Level Sensors and transmitters for level measurement. About 50% of these are liquid level meters, 40% is the level switches.

A wide variety of External Ultrasonic Tank Level Sensors and transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of External Ultrasonic Tank Level Sensors and transmitters instrumentation, located in China.

Request a Quote

Please enable JavaScript in your browser to submit the form