Water level sensor types and works

Table of Contents

What is water degree sensor?

How does the water level sensor work?

Where to use water stage sensors?

What are the benefits of water stage sensors?

What are the types of water stage sensors?

Magnetic flap stage gauge

Optical water stage sensor

Capacitance liquid degree sensor

Hydrostatic level transmitter

Tuning fork degree sensor

Diaphragm liquid degree sensor

Float water stage sensor

Ultrasonic liquid level sensor

Radar stage gauge

Conclusion

What is water degree sensor?

Water stage sensor is a device that measures the excessive or low level of a liquid in a set vessel. According to the method of liquid level measurement, there are two forms of contact and non-contact. What we call input water level transmitter is a contact measurement, which converts the peak of liquid stage into electrical sign output. It is a extensively used water stage transmitter at current.
Various level sensors

How does the water stage sensor work?

The working precept of the water stage sensor is that when it is placed into the liquid to be measured at a certain depth, the stress on the entrance surface of the sensor is converted into the liquid degree top. The calculation method is Ρ=ρ.g.H+Po, where P is the sensor floor stress, ρ is the density of the liquid to be measured, g is the native acceleration of gravity, Po is the atmospheric strain on the surface of the liquid, and H is the depth of the sensor dropped into the liquid.
Where to use water level sensors?

Uses of water stage sensors embody the next functions.
Water level measurement in swimming pools and tanks

Water degree measurement in rivers and lakes

Marine water level measurement

Level measurement of acid and alkaline liquids

Oil degree measurement of oil vehicles and mailboxes

Swimming pool water degree management

Tsunami warning and sea level monitoring

Cooling tower water stage management

Sewage pump water degree control

Liquid level remote monitoring

What are the benefits of water stage sensors?

Simple construction: no movable or elastic parts, extremely dependable, no common maintenance during use. Simple and simple to function.
Easy installation: When utilizing, first join one end of the wire correctly, then put the opposite end of the water level probe into the solution to be measured.
Range optionally available: It can measure the water level inside the vary of 1-200 meters, and different measurement ranges can be custom-made.
Wide vary of application: It is appropriate for liquid stage measurement of high temperature and pressure, strong corrosion, high air pollution and other media.
Wide range of measuring medium: from water, oil to excessive viscosity paste can be measured with excessive accuracy, and the temperature compensation range is wide, not affected by the blistering, deposition and electrical traits of the measured medium.
Long service life: common liquid stage sensor can be used in a standard environment for 4-5 years, in a harsh environment may additionally be used for 2-3 years.
Powerful: could be instantly related to the digital display table real-time show values, can be connected to a wide range of controllers to set the higher and lower limits to regulate the amount of water within the container.
Accurate measurement: built-in high-quality sensors, high sensitivity, quick response time, accurately reflect the refined adjustments within the move or static liquid stage, high measurement accuracy.
Various sorts: The liquid degree sensor has varied construction designs such as input sort, straight rod sort, flange sort, threaded kind, induction type, screw-in kind, float type, etc. It can meet the measurement wants of assorted places.
What are the forms of water degree sensors?

Here are 9 types of liquid stage sensors on your reference.
Display of varied liquid level sensors

Magnetic flap level gauge

Magnetic flip level gauge (also known as magnetic float degree gauge) based mostly on the buoyancy principle and magnetic coupling developed. When the liquid level in the measured container rises and falls, the magnetic float in the body tube of the extent gauge also rises and falls. The everlasting magnetic metal within the float is transferred to the magnetic flip column indicator via magnetic coupling, driving the purple and white flip column to show 180°. When the liquid level rises, the flip column adjustments from white to purple, and when the liquid degree drops, the flip column adjustments from pink to white. The pink and white junction of the indicator is the precise height of the liquid level inside the container, so as to understand a clear indication of the liquid stage.
Magnetic flap level gauge image

Characteristics:
Wide vary of software, installation of assorted forms, suitable for any medium degree, interface measurement.
The measured medium is totally isolated from the indicating construction, with good sealing efficiency, leakproof, and high reliability for liquid degree measurement underneath excessive pressure, high temperature and corrosion conditions.
Set field indication, distant transmission, alarm management about one and can be adjusted freely, fully functional dual-color indication with luminous, steady and intuitive, eye-catching, massive measurement vary, remark path could be arbitrarily changed.
Good vibration resistance, can adapt to the situation of liquid stage fluctuation easy construction, handy set up, low upkeep value.
With nice magnetic metal corrector, on-site adjustment of technical parameters.
Optical water stage sensor

Optical sensors are solid-state. They use infrared LEDs and phototransistors, that are optically coupled when the sensor is within the air. When the sensing head is immersed in a liquid, the infrared gentle escapes, causing the output to vary. These sensors can detect the presence or absence of just about any liquid. They are insensitive to ambient mild, unaffected by bubbles in air, and unaffected by small air bubbles in liquids. This makes them useful in situations where changes in situation have to be recorded shortly and reliably, and the place they’ll operate reliably for long periods with out upkeep.
Optical water stage sensor image

Advantages: non-contact measurement, excessive accuracy, quick response time.
Disadvantages: Do not use in direct daylight, water vapor will have an effect on the measurement accuracy.
Capacitance liquid level sensor

Capacitive degree switches use 2 conductive electrodes (usually manufactured from metal) in a circuit with a short distance between them. When the electrodes are immersed within the liquid, it completes the circuit.
Capacitance liquid degree sensor picture

Advantages: It can be used to determine the rise or fall of liquid in a container. By making the electrodes and the container the same height, the capacitance between the electrodes could be measured. No capacitance means no liquid. A full capacitance represents a full vessel. The “empty” and “full” measurements should be recorded, and the level is then displayed utilizing 0% and 100 percent calibration meters.
Disadvantage: Corrosion of the electrodes will change the capacitance of the electrodes and require cleaning or recalibration.
Hydrostatic stage transmitter

Hydrostatic stage meter is predicated on the principle that the static strain of the measured liquid is proportional to the height of that liquid, and makes use of an isolated diffusion silicon delicate element or ceramic capacitive strain delicate sensor with excellent performance to transform the static pressure into an electrical signal, which is then transformed into a standard electrical sign (generally 4-20mA/1-5VDC) after temperature compensation and linearity correction.
Hydrostatic stage transmitter image

Characteristics

Good stability, full degree, zero long-term stability up to zero.1%FS/ 12 months. The temperature drift is lower than 0.1%FS in the compensation temperature vary from zero ℃ to 70 ℃ and less than 0.3%FS in the entire allowable working temperature range.
With reverse protection, current limiting safety circuit, within the installation of optimistic and adverse polarity connection won’t damage the transmitter, irregular transmitter will mechanically limit the present within 35MA.
Solid structure, no transferring elements, excessive reliability, lengthy service life.
Easy to put in, simple structure, economic and sturdy.
Tuning fork degree sensor

The tuning fork level meter is a liquid point level switching software designed using the tuning fork precept. The working principle of the change is to cause its vibration by the resonance of a piezoelectric crystal.
Tuning fork degree sensor picture

Every object has its resonant frequency. The resonant frequency of an object is expounded to the size, mass, form, and force of the item. A typical instance of the resonant frequency of an object is: the identical glass is continuously full of water of different heights and tapped to carry out instrumental music.
Advantages: could be actually independent of circulate, bubbles, sort of liquid, and so forth. No calibration is required.
Disadvantage: can’t be used for viscous media.
Diaphragm liquid stage sensor

Diaphragm or pneumatic degree switches depend on air strain to push the diaphragm, which engages a microswitch contained in the physique of the device. As the extent increases, the stress within the detection tube increases till the microswitch is activated. As the extent drops, the air strain additionally drops and the switch opens.
Diaphragm liquid stage sensor image

Advantages: The tank doesn’t require electricity, can be utilized with a selection of liquids, and the switch doesn’t come into contact with the liquid.
Disadvantages: maintenance is required over time because it’s a mechanical gadget.
Float water stage sensor

Float degree switches are the unique degree sensors. They are mechanical devices. A hole float is attached to the arm. As the float rises and falls within the liquid, the arm shall be pushed up and down. The arm could be connected to a magnetic or mechanical switch to discover out on/off, or to a degree gauge that will go from full to empty as the level drops.
Float switches for water pumps are a price efficient method to measure water levels in basement pumping pits.
Float water degree sensor picture

Advantages: Float switches can measure any type of liquid and could be designed to operate with none power supply.
Disadvantages: They are larger than other kinds of switches, and since they are mechanical, they should be used more regularly than different stage switches.
Ultrasonic liquid stage sensor

The ultrasonic degree meter is a digital degree meter managed by a microprocessor. In the measurement, ultrasonic pulses are emitted by a transducer (transducer). The sound waves are mirrored by the liquid stage and obtained by the same transducer. It is converted into an electrical sign by a piezoelectric crystal. The time between the emission and reception of the acoustic wave is used to calculate a measure of the gap to the liquid floor.
Ultrasonic liquid stage sensor image

Ultrasonic water stage sensor works on the precept that the ultrasonic transducer (probe) emits high-frequency pulse sound waves when it encounters the measured stage (object) surface, is mirrored, and the reflected echo is obtained by the sensor. Transducer and transformed into an electrical sign. The propagation time of the sound wave. It is proportional to the gap of the sound wave to the floor of the item. Sound wave propagation distance S with the pace of sound C and sound propagation time T could be expressed in the formulation: S = C × T / 2.
Advantages: non-contact measurement, the measured medium is nearly limitless, and can be broadly used to measure the height of assorted liquids and strong supplies.
Disadvantages: the measurement accuracy is affected by the current ambient temperature and dust.
Radar stage gauge

Radar stage gauge is a degree measurement instrument based mostly on the time travel principle. The radar wave travels on the velocity of sunshine and the journey time may be transformed right into a stage signal by electronic elements. The probe emits high frequency pulses traveling at the velocity of sunshine in house. When the pulses encounter the floor of the material, they’re reflected and acquired by the receiver inside the instrument, converting the distance signal right into a level signal.
Radar degree gauge picture

Advantages: big selection of software, unaffected by temperature, dust, steam, and so on.
Disadvantages: straightforward to generate interference echoes, affecting the measurement accuracy.
Conclusion

In many industrial applications, one of many essential elements of course of control is understanding how much fuel or liquid is current in a given vessel. There is a necessity to ensure that the fill level of a given substance doesn’t overflow. Therefore, เกจวัดแรงดัน play an essential function in monitoring the liquid level of a vessel, container or tank. For additional questions or necessities please contact our professional engineers..
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Table of Contents

What is water level sensor?

How does the water stage sensor work?

Where to use water degree sensors?

What are the benefits of water stage sensors?

What are the kinds of water stage sensors?

Magnetic flap degree gauge

Optical water level sensor

Capacitance liquid degree sensor

Hydrostatic degree transmitter

Tuning fork degree sensor

Diaphragm liquid stage sensor

Float water stage sensor

Ultrasonic liquid level sensor

Radar stage gauge

Conclusion

What is water stage sensor?

Water stage sensor is a device that measures the high or low degree of a liquid in a set vessel. According to the tactic of liquid stage measurement, there are two forms of contact and non-contact. What we call enter water stage transmitter is a contact measurement, which converts the peak of liquid degree into electrical sign output. It is a broadly used water level transmitter at present.
Various degree sensors

How does the water stage sensor work?

The working principle of the water level sensor is that when it’s placed into the liquid to be measured at a certain depth, the strain on the front surface of the sensor is transformed into the liquid level height. The calculation formulation is Ρ=ρ.g.H+Po, the place P is the sensor floor strain, ρ is the density of the liquid to be measured, g is the native acceleration of gravity, Po is the atmospheric stress on the surface of the liquid, and H is the depth of the sensor dropped into the liquid.
Where to use water degree sensors?

Uses of water stage sensors embody the following purposes.
Water stage measurement in swimming pools and tanks

Water stage measurement in rivers and lakes

Marine water stage measurement

Level measurement of acid and alkaline liquids

Oil stage measurement of oil vehicles and mailboxes

Swimming pool water level management

Tsunami warning and sea stage monitoring

Cooling tower water stage control

Sewage pump water level control

Liquid level distant monitoring

What are the benefits of water degree sensors?

Simple structure: no movable or elastic components, extremely reliable, no regular upkeep throughout use. Simple and simple to function.
Easy installation: When utilizing, first connect one finish of the wire correctly, then put the other end of the water level probe into the answer to be measured.
Range optionally available: It can measure the water level throughout the vary of 1-200 meters, and other measurement ranges can additionally be custom-made.
Wide vary of utility: It is appropriate for liquid degree measurement of excessive temperature and stress, robust corrosion, high pollution and other media.
Wide vary of measuring medium: from water, oil to high viscosity paste may be measured with high accuracy, and the temperature compensation range is broad, not affected by the blistering, deposition and electrical characteristics of the measured medium.
Long service life: basic liquid stage sensor can be used in a traditional environment for 4-5 years, in a harsh setting can be used for 2-3 years.
Powerful: could be immediately linked to the digital show desk real-time display values, may additionally be linked to a variety of controllers to set the upper and lower limits to manage the quantity of water within the container.
Accurate measurement: built-in high-quality sensors, high sensitivity, quick response time, accurately replicate the subtle changes in the circulate or static liquid stage, high measurement accuracy.
Various varieties: The liquid level sensor has various construction designs corresponding to input sort, straight rod type, flange type, threaded type, induction kind, screw-in type, float type, and so on. It can meet the measurement wants of assorted places.
What are the forms of water degree sensors?

Here are 9 types of liquid degree sensors in your reference.
Display of varied liquid level sensors

Magnetic flap degree gauge

Magnetic flip stage gauge (also known as magnetic float stage gauge) primarily based on the buoyancy precept and magnetic coupling developed. When diaphragm seal in the measured container rises and falls, the magnetic float within the physique tube of the extent gauge additionally rises and falls. The permanent magnetic metal within the float is transferred to the magnetic flip column indicator through magnetic coupling, driving the purple and white flip column to show 180°. When the liquid stage rises, the flip column changes from white to purple, and when the liquid stage drops, the flip column changes from pink to white. The red and white junction of the indicator is the precise height of the liquid level inside the container, in order to realize a transparent indication of the liquid stage.
Magnetic flap level gauge picture

Characteristics:
Wide range of software, set up of various varieties, suitable for any medium stage, interface measurement.
The measured medium is totally isolated from the indicating construction, with good sealing efficiency, leakproof, and excessive reliability for liquid stage measurement underneath excessive strain, high temperature and corrosion situations.
Set subject indication, distant transmission, alarm management about one and may be adjusted freely, totally useful dual-color indication with luminous, continuous and intuitive, eye-catching, massive measurement vary, statement direction may be arbitrarily changed.
Good vibration resistance, can adapt to the scenario of liquid degree fluctuation easy construction, convenient set up, low maintenance cost.
With nice magnetic metal corrector, on-site adjustment of technical parameters.
Optical water degree sensor

Optical sensors are solid-state. They use infrared LEDs and phototransistors, that are optically coupled when the sensor is within the air. When the sensing head is immersed in a liquid, the infrared mild escapes, inflicting the output to change. These sensors can detect the presence or absence of virtually any liquid. They are insensitive to ambient mild, unaffected by bubbles in air, and unaffected by small air bubbles in liquids. This makes them useful in situations the place changes in situation have to be recorded rapidly and reliably, and the place they can operate reliably for lengthy intervals with out maintenance.
Optical water level sensor picture

Advantages: non-contact measurement, excessive accuracy, quick response time.
Disadvantages: Do not use in direct sunlight, water vapor will have an effect on the measurement accuracy.
Capacitance liquid degree sensor

Capacitive degree switches use 2 conductive electrodes (usually made of metal) in a circuit with a short distance between them. When the electrodes are immersed within the liquid, it completes the circuit.
Capacitance liquid level sensor picture

Advantages: It can be utilized to find out the rise or fall of liquid in a container. By making the electrodes and the container the identical height, the capacitance between the electrodes may be measured. No capacitance means no liquid. A full capacitance represents a full vessel. The “empty” and “full” measurements should be recorded, and the level is then displayed utilizing 0% and 100% calibration meters.
Disadvantage: Corrosion of the electrodes will change the capacitance of the electrodes and require cleaning or recalibration.
Hydrostatic level transmitter

Hydrostatic stage meter is predicated on the precept that the static stress of the measured liquid is proportional to the height of that liquid, and makes use of an isolated diffusion silicon sensitive component or ceramic capacitive strain delicate sensor with wonderful efficiency to transform the static stress into an electrical signal, which is then transformed into a standard electrical signal (generally 4-20mA/1-5VDC) after temperature compensation and linearity correction.
Hydrostatic level transmitter image

Characteristics

Good stability, full diploma, zero long-term stability as much as 0.1%FS/ year. The temperature drift is lower than zero.1%FS in the compensation temperature range from zero ℃ to 70 ℃ and fewer than 0.3%FS in the whole allowable operating temperature vary.
With reverse safety, current limiting safety circuit, within the set up of constructive and unfavorable polarity connection will not injury the transmitter, abnormal transmitter will automatically restrict the current inside 35MA.
Solid construction, no moving parts, excessive reliability, long service life.
Easy to put in, simple construction, financial and sturdy.
Tuning fork stage sensor

The tuning fork level meter is a liquid point stage switching software designed utilizing the tuning fork precept. The working precept of the swap is to trigger its vibration by the resonance of a piezoelectric crystal.
Tuning fork level sensor image

Every object has its resonant frequency. The resonant frequency of an object is expounded to the dimensions, mass, form, and force of the object. A typical example of the resonant frequency of an object is: the identical glass is continuously crammed with water of different heights and tapped to perform instrumental music.
Advantages: may be really unbiased of flow, bubbles, sort of liquid, and so forth. No calibration is required.
Disadvantage: can’t be used for viscous media.
Diaphragm liquid degree sensor

Diaphragm or pneumatic level switches depend on air pressure to push the diaphragm, which engages a microswitch contained in the body of the gadget. As the level will increase, the stress within the detection tube will increase until the microswitch is activated. As the extent drops, the air strain additionally drops and the swap opens.
Diaphragm liquid stage sensor image

Advantages: The tank doesn’t require electricity, can be used with a wide selection of liquids, and the change does not come into contact with the liquid.
Disadvantages: upkeep is required over time because it is a mechanical device.
Float water level sensor

Float stage switches are the unique degree sensors. They are mechanical devices. A hole float is connected to the arm. As the float rises and falls within the liquid, the arm shall be pushed up and down. The arm may be connected to a magnetic or mechanical swap to determine on/off, or to a degree gauge that can go from full to empty as the level drops.
Float switches for water pumps are a value efficient method to measure water ranges in basement pumping pits.
Float water degree sensor image

Advantages: Float switches can measure any type of liquid and can be designed to function with none power source.
Disadvantages: They are bigger than different kinds of switches, and since they are mechanical, they should be used more frequently than other level switches.
Ultrasonic liquid level sensor

The ultrasonic stage meter is a digital stage meter managed by a microprocessor. In the measurement, ultrasonic pulses are emitted by a transducer (transducer). The sound waves are reflected by the liquid degree and received by the identical transducer. It is converted into an electrical sign by a piezoelectric crystal. The time between the emission and reception of the acoustic wave is used to calculate a measure of the distance to the liquid floor.
Ultrasonic liquid degree sensor image

Ultrasonic water stage sensor works on the precept that the ultrasonic transducer (probe) emits high-frequency pulse sound waves when it encounters the measured degree (object) surface, is reflected, and the reflected echo is obtained by the sensor. Transducer and transformed into an electrical sign. The propagation time of the sound wave. It is proportional to the space of the sound wave to the floor of the object. Sound wave propagation distance S with the speed of sound C and sound propagation time T could be expressed within the formula: S = C × T / 2.
Advantages: non-contact measurement, the measured medium is nearly unlimited, and could be extensively used to measure the peak of assorted liquids and strong materials.
Disadvantages: the measurement accuracy is affected by the present ambient temperature and dirt.
Radar stage gauge

Radar stage gauge is a level measurement instrument based mostly on the time journey precept. The radar wave travels on the velocity of light and the journey time may be transformed into a level sign by digital elements. The probe emits excessive frequency pulses touring at the speed of sunshine in area. When the pulses encounter the floor of the fabric, they are reflected and obtained by the receiver contained in the instrument, changing the distance sign into a stage sign.
Radar stage gauge picture

Advantages: wide selection of utility, unaffected by temperature, mud, steam, and so on.
Disadvantages: straightforward to generate interference echoes, affecting the measurement accuracy.
Conclusion

In many industrial applications, one of the important parts of course of management is understanding how a lot gas or liquid is present in a given vessel. There is a necessity to make certain that the fill level of a given substance doesn’t overflow. Therefore, stage measurement transmitters play an essential function in monitoring the liquid level of a vessel, container or tank. For additional questions or requirements please contact our professional engineers..

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