Eleven of the most common liquid level gauges

What are the level meters? The level meter is to measure the height of the liquid level in the tank or box. It shows the height of the liquid level inside.Magnetic flip plate liquid level meter, glass tube liquid level meter, liquid level transmitter, two-color quartz tube liquid level meter, buoy liquid level meter......Do you know them all?

Explosion-proof float level switch

 

Explosion-proof float level switch, also known as explosion-proof float level controller.It is designed for use in explosive environment make the liquid level control instrument, this product is designed based on the principle of buoyancy and lever principle, when the container liquid level changes, the position of the float ball will change along with the change of liquid level, the floating ball will leverage the displacement in the micro switch, which is produced by the micro switch switch signal.

 

Glass plate level gauge

 

Glass plate liquid level meter is designed based on the principle of the communicator. The liquid path formed by the glass plate and the main body of the liquid level meter is connected with the tested container through the flange or taper pipe thread, and the liquid level observed through the glass plate is the same as the liquid level in the container, that is, the liquid level is high.

 

The needle valve at both ends of the liquid level gauge not only ACTS as a globe valve, but also has the function of the internal steel ball as an anti-check valve. When the liquid level gauge is damaged or leaked unexpectedly, the steel ball can automatically close the liquid channel under the action of the medium pressure to prevent a large number of liquid outflow and play a role of safety protection.The material of liquid level gauge can be changed or some accessory parts can be added to achieve anticorrosion, heat preservation, frost prevention, lighting and other functions.

 

Glass tube level gauge

 

Liquid level gauge is based on the principle of communicator design, by the glass tube of the liquid path.The channel is connected with the tested container with a flange or tapered pipe thread to form a communicator. The liquid level observed through the glass pipe is the same as the liquid level in the container, that is, the liquid level.

 

Pipe-type liquid level meter is mainly composed of glass tube, protective sleeve, upper and lower valves and connecting flange (or thread).By changing the material of the part or adding some accessory parts, the function of anti-corrosion or heat preservation can be achieved.

 

Steel strip level gauge

 

Steel strip level gauge is a kind of traditional level gauge.It is designed and manufactured using the principle of mechanical equilibrium.It is composed of liquid level detection device, high-precision displacement transmission system, constant force device, display device, transmitter device and other peripheral devices.

 

The float immersed in the measured liquid is subjected to gravity W, buoyancy F and constant tension T generated by the constant force device. When the vector sum of the three forces is equal to zero, the float is in a quasi-equilibrium static state.In mechanical equilibrium, the buoyancy is quasi-constant (the volume V of the float immersed in the liquid is constant).

 

When the liquid level changes, the original mechanical equilibrium will be disturbed by the buoyancy and reach a new equilibrium through the movement of the steel belt.The liquid level detection device (float) drives the steel belt to move according to the liquid level. The displacement transmission system drives the driving pin to rotate through the movement of the steel belt, and then ACTS on the counter to display the liquid level.

 

The transmitter converts this level information into a standard electrical signal and outputs it via a signal line.This electrical signal can drive other control devices.

 

Magnetic flip column level meter

 

Application scope and features:

 

The steel strip level gauge has the advantages of strong practicability, wide measuring range, high precision, high performance and stability, long service life and easy maintenance.In addition, large counter display, make the reading clear and accurate;Manual float lifting mechanism can check the working condition of the instrument at any time;Can be connected with a variety of transmitters, composed of liquid level detection system.

 

Can be widely used in petroleum, chemical, electric power, metallurgy, environmental protection, food and other industrial departments and ancillary facilities of various transmitter connection, the change of liquid level in the container into analog signal, electrical pulse signal or switch signal remote transmission to the control room display or computer room for data display and processing.Magnetic flip column liquid level meter is also known as magnetic flip plate liquid level meter, its structure is mainly based on buoyancy and magnetic principle of design and production.The position of a float with a magnet in the measured medium is affected by buoyancy.The change of liquid level leads to the change of the position of the magnetic float, and the static magnetic coupling between the magnetic float and the magnetic flip column (also known as the magnetic flip plate) causes the magnetic flip column to flip at a certain Angle (the surface of the magnetic flip column is coated with different colors), thus reflecting the situation of liquid level in the container.

 

With the electronic module and transmitter module composed of sensor (reed switch) and precision electronic components, it can change the output resistance value signal, current value (4 ~ 20mA) signal, switch signal and other electrical signals.So as to realize the perfect combination of field observation and remote control.

 

Maglev ball level gauge (level switch)

 

Application scope and features:

 

With: simple structure, easy to use, stable performance, long service life, easy to install and maintain the advantages.

 

Magnetic flip column liquid level meter can be applied to almost all kinds of industrial automation process control of liquid level measurement and control.It can be widely used in oil processing, food processing, chemical industry, water treatment, pharmaceutical, electric power, paper making, metallurgy, ship and boiler in the field of liquid level measurement, control and monitoring.

 

The structure of magnetic floating ball liquid level meter (liquid level switch) is mainly designed and produced based on the principles of buoyancy and static magnetic field.The position of the floating ball with magnet in the measured medium is affected by buoyancy: the change of liquid level leads to the change of the position of the magnetic float.

 

The magnets and sensors in the floating ball (reed switch) act to change the number of elements (such as constant resistance) in series into the circuit, thus changing the electrical quantity of the instrument circuit system.That is, a change in the position of the magnetic float causes a change in the electrical quantity.The liquid level in the container is reflected by measuring the change of electrical quantity.

 

The liquid level meter can directly output resistance signal, or it can be combined with the use of transmission module, output current value (4 ~ 20mA) signal;At the same time with other converters, output voltage signal or switch signal (can also be according to customer demand converter by the company distribution).So as to realize the remote transmission, analysis and control of electrical signals.

 

Hammer detection level gauge

 

Application range and characteristics of liquid level detected by weight hammer:

 

Magnetic floating ball liquid level meter can be applied to almost all kinds of industrial automation process control of liquid level measurement and control, can be widely used in petroleum processing, food processing, chemical industry, water treatment, pharmaceutical, electric power, paper making, metallurgy, ships and boilers and other fields of liquid level measurement, control and monitoring.The meter is designed and manufactured according to the principle of mechanical balance.When the steel strip is immersed in the liquid and floating at a certain position, the gravity of the float, the wire rope (or steel strip), the weight of the hammer and the pointer, the buoyancy of the liquid and the friction of the system are in equilibrium.

 

When the liquid level changes, buoyancy F will change accordingly, and the original equilibrium of the system will be disturbed and reach the dynamic equilibrium again.The change of liquid level leads to the change of float position. The hammer drives the pointer up and down, which can clearly and intuitively show the change of liquid level in the container.

 

The top of the scale plate is marked with the liquid level zero, and the bottom is marked with the liquid level full range.The pointer changes with the change of the level of the object, indicating the level of the liquid continuously.

 

Ultrasonic level meter

 

Is through a can launch the applicable scope and characteristics:

 

It has the advantages of reasonable structure design, good performance, reliable operation, long service life, easy installation and maintenance, and reasonable price.It can be widely used in the field of chemical industry, electric power, water treatment and other large and medium-sized storage tank liquid as well as high viscosity, corrosive liquid liquid level continuous measurement under atmospheric pressure.A device that transmits an energy wave (usually an impulse signal) that bounces off an obstacle and is received by a receiving device.The change of object level is determined by measuring the time difference of energy wave movement.Microwave signals are processed by electronic devices and eventually converted into electrical signals related to the object level.

 

Launched a probe to the surface of the measured medium ultrasonic pulse signal, the ultrasonic wave in encountered in the transmission process of the medium to be measured (obstacles) after reflection, reflected ultrasonic signal through the electronic module testing, processed by special software, the analysis of launch ultrasonic wave and echo of time, the combination of ultrasonic velocity, can be accurate to calculate the distance of ultrasonic transmission, which can reflect the level of the situation.

 

Intelligent radar level meter

 

Intelligent radar level meter is a microwave application range and features:

 

Can be used for steam, dust, moisture interference automatic compensation, in addition to liquid/solid, can also be used for uninterrupted material/liquid level control, tank, storage tank, uninterrupted material/liquid level measurement store, granary, etc.Widely used in petroleum, chemical industry, tap water, sewage treatment, water conservancy and hydrology, iron and steel, coal, electricity, transportation and food processing industries.Object level meter, which is an application of microwave (radar) positioning technology.It transmits energy waves through a device that can emit energy waves (generally pulse signals). The energy waves reflect when they encounter obstacles, and a receiver receives the reflected signals.The change of object level is determined by measuring the time difference of energy wave movement.Microwave signals are processed by electronic devices and eventually converted into electrical signals related to the object level.

 

In microwave object level measuring equipment, the energy wave used is usually a high frequency electromagnetic wave with a frequency of 8.3ghz (mostly around 6GHz, but also with a higher frequency).The energy waves used by the device are pulsed energy waves.Generally, the maximum pulse energy is about 1 mw (the average power is about 1 muw), which will not cause radiation damage to other equipment and personnel.

 

Capacitance level meter

 

Measuring principle of capacitance level meter, application range of oscillation circuit:

 

Intelligent radar level liquid level gauge is used for non-contact continuous measurement of liquid, slurry and particle material material level, suitable for temperature, pressure changes, the presence of inert gas or steam occasions.It adopts the measurement method of microwave pulse (PTOF) and can work normally in the range of industrial frequency band.Low beam energy, can be installed in a variety of metal, non-metal containers or pipelines, no harm to the human body and the environment.Oscillation frequency features:

 

1. No blind spot, high precision

 

2. Two-wire system technology is an excellent substitute for differential pressure instruments, magnetostriction, rf admittance and magnetic flip plate instruments.

 

3, not affected by pressure change, vacuum, temperature change, inert gas, smoke, steam and other environment

 

4. Easy to install, durable and maintenance-free

 

5. The output signal is 4mA ~ 20mA/HART protocol. The calibration is simple, and the on-site calibration operation can be easily realized through digital liquid crystal display

 

6. Sensitive measurement and fast refresh speed.

 

7. Suitable for high temperature conditions, up to 200℃ process temperature, up to 350℃ when using high temperature extension antenna.

 

The rate is related to the capacitance value, and the change of the object level causes the change of the system capacitance, which then changes the oscillation frequency of the oscillation circuit.The oscillating circuit in the sensor can convert the change of capacitance caused by the change of object level into the change of frequency, and send it to the electronic module. After the calculation, analysis and processing, it can be converted into the engineering quantity to display, so as to realize the continuous measurement of object level.

 

The meter is made of advanced technology and production process. It consists of sensors, secondary meters and other accessories.The sensor is placed on the top of the bin, the probe is vertically inserted into the bin, and the secondary instrument is placed in another suitable place.The sensor converts the change of the object level into the corresponding electrical pulse signal, which is transmitted to the secondary instrument for processing and displaying the height of the object level.4 ~ 20 ma.Transfer output, suitable for liquid/solid material crop height display, alarm, control and remote display or composition system.

 

Magnetostriction level meter

 

Working principle of magnetostrictive liquid level sensor: applicable range and characteristics of electronic warehouse:

 

The liquid level gauge has the advantages of simple structure, convenient installation and reliable performance.At the same time, the electrical pole stainless steel material manufacturing, corrosion resistance, insulation and electrical conductivity materials can be used, and the maintenance amount is small.

 

The liquid level meter can be widely used in petroleum, chemical, electric power, metallurgy, food, environmental protection and other industrial sectors to open or pressure vessel level monitoring.However, the liquid level gauge is not suitable for occasions where the dielectric constant or material humidity changes too much and where the material particle is larger than 15mm and cannot make good contact with the electrode.Son a initial pulse circuit, the initial pulse in the waveguide wire transfer, at the same time produce a along the waveguide of a rotating magnetic field direction, when the magnetic field and the circular or float in the permanent magnetic field when they met, magnetostrictive effect, make the waveguide are analyzed.moreover, the twist was installed in the electronic compartment can pick up institutions perceived translates into the corresponding current pulse, through electronic circuit to calculate the time difference between two pulses, can accurately measure the displacement of measured and liquid level.