Liquid Chemical Level Sensor is suitable for level measurement of corrosive chemicals. Pulse radar non-contact measurement. Antenna made of PTFE.

SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

Liquid Chemical Level Sensor works for level measure and monitor of corrosive liquids for Chemical Processing. The level measurement of corrosive chemicals places extremely high demands on the sensor. Downtime must be avoided. The radar liquid level sensor wrapped in PTFE is corrosion resistant and has a long service life. The sensor has both analog and digital outputs that comply with industry standards. SIRD-901 Radar Corrosive Liquid Chemical Level Sensor is a 26GHz pulse radar level transmitter. The measuring distance can reach 10 meters. The antenna has been further optimized and is suitable for the measurement of various corrosive liquids.

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

Features of SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

The SIRD90 series radar sensor is a 26G Hz radar level measuring instrument, with a maximum distance of up to 80 meters.

  • Non-Contact Measurement
  • Continuous Level Measurement
  • Pulse Radar Measurement Range 0.254 to 15.24m (10″ to 50′)
  • Simple Push-Button Calibration
  • High measurement accuracy
  • Measurement is not affected by temperature, pressure or dust
  • User-friendly adjustment saves time

Parameters of SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

Radar Level Transmitters
Radar Level Transmitters
Application:All kinds of corrosive liquid
Measuring Range:10 meters
Process Connection:Thread G1½″A / Thread 1½″ NPT /  Flange
Process  Temperature:-40℃~130℃
Process Pressure:-0.1~0.3 MPa
Accuracy:± 5mm
Protection Grade:IP67
Frequency Range:26GHz
Supply:2-wire(DC24V)/ 4-wire(DC24V /AC220V)
Signal Output:4… 20mA /HART (2-wire / 4-wire)RS485/ Modbus
Outer Covering:Aluminum / Plastic / Stainless steel
Explosion-proof Grade:ExiaⅡC T6 Ga/ Exd ⅡC T6 Gb
Antenna MaterialStainless Steel  /  PTFE

Applications of Radar Corrosive Liquid Chemical Level Sensor

application of radar level transmitter
Application of radar level transmitter
  • Solid materials;
  • Process vessels or strong dust are easy to crystallize;
  • Condensation occasions
  • Solid Particles
  • Dust
  • Slightly corrosive liquids
  • Various corrosive liquids
  • Hygienic liquid storage containers
  • Strong corrosive containers

Extended reading: Radar Non Contact Water Level Sensor

Corrosive Liquid Chemical Level Sensor in Chemical Processing

Generally, in chemical plants, you will encounter liquid level measurement such as petroleum storage tanks, chemical storage tanks, chemical storage tanks, sewage treatment plants, dosing tanks, seaside, and docks.

Used to measure corrosive media such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, and concentrated alkali.

When encountering these corrosive media, corrosive liquid level sensors are generally used. Use non-contact radar level sensors to measure corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid.

Following the introduction of Sino-Inst, we have to consider four major principles when choosing a level gauge to measure.

Corrosive Liquid Chemical Level Sensor in Chemical Processing
Corrosive Liquid Chemical Level Sensor in Chemical Processing

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

The first principle is to consider the principle of non-contact measurement and choose a non-contact liquid level sensor.

Because the probe of the liquid level sensor does not need to contact the medium. The principle of sensing band is used to obtain the current liquid level information. Such a liquid level sensor, for example, when measuring a level, a radar level gauge does not contact the measured medium, and the material used is tetrafluoroethylene. At the same time, it is a fully enclosed anticorrosive structure. Therefore, the effect is very good for liquid level measurement of viscous, corrosive, turbid and other liquids.

The second principle is to consider the convenience of installation.

Due to the uniqueness of the measurement of corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. It needs simple installation on site. It needs to be simple to open a hole in the tank.

Therefore, in the selection process of the level gauge, it is necessary to consider the characteristics of reliable work, easy installation, long service life, and maintenance-free.

The third principle is sensor selection.

When the radar level gauge measures corrosive media, the general manufacturer will choose the anti-corrosion type tetrafluoro material contact surface. Considering environmental factors, a physically sealed anti-corrosion probe should be selected for this occasion.

The fourth principle is the choice of the host part.

As the host part, good sealing is required. As long as there is a little medium leakage, it is possible to enter the inside of the level gauge from the housing or the wire inlet. As a result, the internal circuit board is corroded.

For corrosive gases in the environment, anticorrosive high frequency radar level gauges can be used to protect the service life of the host.

The above is Sino-Inst analyzes how to choose the level sensor for concentrated sulfuric acid and hydrochloric acid. If concentrated sulfuric acid and hydrochloric acid exceed a certain temperature range, steam or vaporization occurs. It is necessary to consider the actual situation on site and re-select the appropriate level sensor.

Extended reading: FMCW Radar Level Transmitter 120GHz

How does a Radar Corrosive Liquid Chemical Level Sensor work?

In radar level measurement, microwaves are transmitted by the antenna system of the radar sensor, to the measured product, reflected by the product surface, and received back by the antenna system.

The time from emission to reception of the signals is proportional to the level in the vessel. In continuous non-contact level measurement with radar, the sensor sends microwave signals towards the medium from above.

The surface of the medium reflects the signals back in the direction of the sensor. Using the received microwave signals, the sensor determines the distance to the product surface and calculates the level from it.

Liquids and solids are commonly measured with this measuring technique.

Featured Level Sensors for Chemical Processing

What is the difference between ultrasonic and radar level transmitters?

As the name implies, ultrasonic level sensors, operate by emitting a burst of sound waves in very rapid succession.

These sound waves hit the intended target, bounce back to the sensor, and travel at known speed (the speed of sound). We can calculate the time of flight and come up with a distance.

Radar, by contrast, works not with sound waves, but with electromagnetic waves.

This is the key difference.

Like ultrasonics, the waves bounce off of objects, and travel at a known speed (much faster than ultrasonic waves). But they react differently to certain materials.

There is a different set of variables that affects how well a radar sensor operates.

Unlike ultrasonic sensors, radar is much less affected by temperature, improving consistency and accuracy.

Radar is also well suited for specialty applications, such as working in a vacuum, or in higher pressures (as long as the housing can handle it).

An important factor is the target material’s dielectric constant.

A material with a low dielectric will not reflect an electromagnetic wave, so radar tends to pass right through.

These materials are typically non-conductive and have low moisture content, such as dry powders and granules.

To be fair, radar can sense a lot of these materials, but the energy of the returning waves is so small, that precise alignment with the signal is paramount.

This introduces techniques such as guided wave radar, or special antenna.
Measuring materials with a low dielectric constant, is not always impossible, just very challenging.

All with a low dielectric will not reflect an electromagnetic wave, so radar tends to pass right through.

These materials are typically non-conductive and have low moisture content, such as dry powders and granules.

Extended reading: guided wave radar level sensor advantages and disadvantages

Let’s see this video about: Ultrasonic Level versus Guided Wave Radar Level

Video source: https://www.youtube.com/embed/siAMerrbpPU?rel=0

How do you calibrate radar level transmitter?

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

In liquid level measurement, the use of ultrasonic level transmitters is very common. The influence of various factors such as temperature, humidity, dust, and chemical composition of the liquid to be measured can easily lead to low measurement accuracy.

We mainly discuss the systematic error of ultrasonic level transmitters here. (In addition, there are reference sound speed accuracy errors and transit time errors, etc.)

System error is mainly caused by system delay. The main sources of system delay include hardware circuit delay, interrupt response delay of single-chip microcomputer, and probe response delay.

Since the ultrasonic level transmitter works in the pulse emission state. After the single chip microcomputer sends a transmission command each time, the transmitting power amplifier circuit needs to go through an energy accumulation process to achieve the transmission state. At the same time, the piezoelectric ceramics in the probe also have a starting process. To reach 40kHz The vibration frequency also takes a certain amount of time.

The timing starts from the launch of the command. Therefore, the system delay must be considered and compensated in software.

In addition, when ultrasonically measuring the liquid level, the liquid level distance is from the surface of the front end of the probe to the liquid level. In fact, the acoustic center of piezoelectric ceramics is not on its surface.

Therefore, the distance from the probe surface to the acoustic center point will also cause a systematic error. This error can be classified as a delay error and corrected together.

For the same type or batch of ultrasonic level transmitters, the system delay is almost the same due to the same components, materials and processes used, and it is a relatively fixed value. Therefore, the system delay can be calibrated and corrected by means of a fixed distance test.

In addition to the top-mounted ultrasonic level transmitter, there is also a type of externally-measured liquid level transmitter, also known as externally-mounted liquid level transmitter and externally-mounted ultrasonic level transmitters.

The difference from the top-mounted type is that the external measurement type is attached to the horizontal position of the tank bottom. The liquid level is measured by using the ultrasonic wave to penetrate the tank bottom to reach the gas-liquid interface and return the echo to calculate the height of the liquid level.

Frequently
Asked
Questions

Liquid level sensor is a device used to monitor, maintain and measure liquid (and sometimes solid) levels. Once the liquid level is detected, the sensor converts the sensed data into an electrical signal.

Read More about: How many types of level transmitters are there?

If you want to divide the level sensor into two categories. Then it can be divided into contact and non-contact.

Common contact liquid level sensors, such as: hydrostatic liquid level sensors, float level transmitters, etc.
Common non-contact liquid level sensors, such as ultrasonic liquid level sensors, radar liquid level sensors, etc.

We generally encounter oil storage tanks, chemical storage tanks, chemical storage tanks, sewage treatment plants, dosing tanks, seaside, docks and other liquid level measurements in chemical plants. It is used to measure corrosive media such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, and concentrated alkali.

When encountering these corrosive media, we generally use corrosive ultrasonic level sensors, or non-contact radar level sensors to measure corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid.

The first principle requires consideration of the non-contact measurement principle. Choose a non-contact level sensor.

If a non-contact level sensor is not available. Contact type can be lined with tetrafluoro-capacitor or guided wave radar.

Capacitance requires two media to be calibrated separately on site, which is cheap and easy to install and operate.
Guided wave radar needs to know the dielectric constant of the medium. Generally, the upper layer is non-conductive and the lower layer is conductive.

Liquid level control, also known as water level switch, liquid level sensor. As the name implies, it is a switch used to control the liquid level. From the form, it is mainly divided into contact type and non-contact type.

Commonly used non-contact switches include capacitive liquid level switches, and contact-type float level switches are the most widely used. Electrode liquid level switch, electronic liquid level switch, capacitive liquid level switch can also be realized by contact method.

The pressure type liquid level transmitter measures the current liquid level height through pressure sensing, so that the manufacturer can record the demand. Therefore, the pressure level transmitter is essentially a pressure transmitter.

Therefore, for the calibration of pressure level transmitter and pressure transmitter, please refer to: how to calibrate a pressure transmitter.

The differential pressure liquid level transmitter has been calibrated according to the customer’s requirements before leaving the factory. The range, accuracy, etc. are marked on the nameplate of the differential pressure liquid level transmitter.

As long as the parameters such as the density of the measured medium meet the requirements of the nameplate, there is no need to adjust it in normal use.

If the customer needs to adjust the span or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0~10 meters:

  1. Unscrew the casing of the differential pressure liquid level transmitter. External standard 24VDC power supply and ammeter (requires 0.2% or higher accuracy) can be adjusted.
  2. When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero point potentiometer so that the output current is 4mA.
  3. Pressurize the differential pressure liquid level transmitter to the full scale (10 meters). Adjust the full-scale resistor so that the output current is 20mA.
  4. Repeat the above steps two or three times until the signal is normal.
  5. Please input 25%, 50%, 75% of the signal respectively to check the deviation of the differential pressure liquid level transmitter.
  6. For non-water media, when the differential pressure liquid level transmitter is calibrated with water, it should be converted according to the pressure generated by the actual use of the medium density. For example, when the density of the medium is 1.3, the 1.3m water level should be used to calibrate the 1m range.
  7. After adjustment, tighten the protective cover.
  8. The calibration cycle of the differential pressure liquid level transmitter is once a year.
  9. The HART intelligent differential pressure liquid level transmitter of Sino-Inst can be selected, which is convenient to adjust the range of the differential pressure liquid level transmitter.

Read More: Use Differential Pressure Transmitter to Measure Liquid Level

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Extended reading: Drop Antenna Radar Tank Level Sensor

Sino-Inst is Manufacturer of Corrosive Liquid Chemical Level Sensors. We supply more than 20 kinds of Corrosive Liquid Chemical Level Sensors. 70% radar level meters, and other types of flowmeters.

Corrosive Liquid Chemical Level Sensors are mainly used for level measurement of All kinds of corrosive liquid.

With PTFE Antenna Material, SIRD-901 Radar Corrosive Liquid Chemical Level Sensor can measure various highly corrosive liquids and slurries. For example: process reaction storage tanks, acid-base storage tanks, slurry storage tanks, solid storage tanks, small oil tanks, etc.

Corrosive Liquid Chemical Level Sensors enable stable level measurement. This greatly meets the measurement needs of many applications. Can be used from small to large tanks. For efficient non-contact level measurement of Chemical tanks.

Sino-Inst’s Corrosive Liquid Chemical Level Sensors, made in China, Having good Quality, With better price. Our level measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a Corrosive Liquid Chemical Level Sensors, Flow sensor, or other device, give us a call .

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