Explain the difference: Float level sensor, Float level switch and Float level controller

Posted on October 22, 2020 by KimGuo11

Float level switch, Float level sensor and Float level controller are commonly used liquid level monitoring instruments.

Users are consulting on float level timing, and often confuse it with float level switches and float level gauge controllers. But because they are not the same product, their functions and prices are quite different. So, what are the differences between the float level gauge, the float level switch and the float level controller?

Generally speaking, the main differences between float level gauge, float level switch and float level controller are as follows:

1.Float level sensor, Float level switch and Float level controller Structure difference

Float level sensor, Float level switch and Float level controller difference

Float level gauges are generally straight rod type. A maglev ball is placed on the straight rod, and the reed switch in the straight rod can be attracted by moving the maglev ball up and down. The purpose of increasing the resistance value in series is achieved by attracting the reed switch. Because the output 4-20mA remote signal is a current signal, under the condition of a certain voltage, the current is proportional to the resistance. The greater the resistance, the greater the current. Therefore, there is a series circuit board circuit inside the straight rod of the float level gauge.

The reed switch is directly placed inside the float level controller, without the need to design a circuit board separately.

The structure of the float level switch is the simplest.

Float level sensor can also be used with paperless recorder.

Extended reading: Float Level Sensors – Single and Multipoint

2.Float level sensor, Float level switch and Float level controller Price difference

Because the structure of the float level gauge is more complicated, its price is relatively high. The price of float level controller is second, and the price of float level switch is the cheapest.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

3.Float level sensor, Float level switch and Float level controller Functional difference

Float Level Gauge A level gauge that can measure liquid level values. The float level controller cannot display the specific level value. Only one switch value alarm point signal is given.

The float level switch is especially suitable for use in small tanks, but you need to open the hole at the height you need. Then install one end of the float at the position where the alarm is needed. When the liquid level reaches the position, the floating ball will be lifted up and the contact point will be automatically disconnected to act as an alarm.

Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor

Featured Float level sensor, Float level switch and Float level controller

**SI-U02 Multi-Point Liquid Level Float Switch**

**SI-U03 Float Switch Water Level Controller**

**SI-U04 Magnetic Float Level Sensor-Reed Switch**

**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**

Extended reading: Radar Level Sensor Advantages and Disadvantages

The customer consults the float level gauge, and the salesperson asks for detailed parameters. The customer just said that it needs 8 on-off alarm points with a measuring length of 5 meters, and nothing else. Our sales staff made a quotation based on this parameter.

After the quotation. Suddenly, the customer asked for a 4-20mA remote signal with a secondary display meter. In this way, the price of the second quotation more than doubled. Customers began to question the price.

Customers think this is the same product. Why does one more parameter make people feel that they are completely two products? This requires customers to clearly understand the specific differences between the float level gauge, the float level controller, and the float level switch.

The float level gauge is used as a level gauge that can measure the liquid level value. Float level gauges are generally straight rod type. A maglev ball is set on the straight rod. Move the maglev ball up and down to attract the reed switch in the straight rod. The purpose of increasing the resistance value in series is achieved by attracting the reed switch.

Because the output 4-20mA remote signal is a current signal. In the case of a certain voltage, current and resistance are proportional. The greater the resistance, the greater the current. Therefore, the float level gauge has a series circuit board circuit inside the straight rod, so the price is relatively high.

And if there is no need to display the specific level value, then there is no need to output a 4-20mA signal to the secondary instrument in the straight rod of the float level gauge. It only needs to be able to give a switch alarm point signal. Then the reed switch can be placed directly inside the float level gauge, without the need to design the circuit board separately. This way the price will be different. Of course, the name becomes the float level controller. So the price is different.

Many customers will also say that it is the float level gauge that they are looking for when they buy it. In fact, to be more precise, this cannot be called a float level gauge. Because it no longer has the function of measuring liquid level value.

The float level switch is simpler than this, and the structure is simpler. Especially suitable for use in small tanks. The float level switch needs to make a hole at the required height by itself, and then install the float at the position where the alarm is needed. When the liquid level reaches the position, the floating ball will be lifted up and the contact point will be automatically disconnected to act as an alarm.

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

What is float level switch?

The float level switch is a simple-structured medium level measurement, using a level controller that is easy to install. Because the installation has no complicated circuits, the operation is not affected. The user only needs to select the correct material when selecting the model. It is suitable for measuring liquid, pressure or temperature in any environment.

Liquid level switches are widely used in industrial equipment, agricultural equipment, and household appliances. The main structure of the float liquid level switch is composed of a magnetic reed switch and a float. The float has magnetic materials. When the float moves up and down with the measured liquid level, the magnetic reed switch is touched to detect the liquid level position.

What is a normally open float switch?

Float type liquid level switch can choose the open and close type of contact when ordering. Normally open or normally closed

Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor

How do float level sensors work?

Float level meter is an instrument for measuring liquid level. It is widely used in the field of liquid measurement. Many industries will choose to use it for measurement equipment. Such as the petroleum, chemical, and pharmaceutical industries.

Float level sensor: Float level sensor is designed and produced based on the principle of buoyancy and static magnetic field. The position of a floating ball with a magnet (floating ball for short) in the measured medium is affected by buoyancy.

The change of the liquid level causes the position of the magnetic float to change. The role of the magnet and sensor (reed switch) in the floating ball changes the number of components (such as fixed resistance) connected in series to the circuit. Thereby changing the electrical quantity of the instrument circuit system. That is, changes in the position of the magnetic float cause changes in the electrical quantity. The change of the electrical quantity is detected to reflect the liquid level in the container.

The float level sensor is installed on the top of the container through a connection flange. The float ball floats on the liquid surface according to the principle of discharging the liquid volume phase and so on.

When the liquid level of the container changes, the float ball also moves up and down. The reed switch of the ball level gauge is magnetically attracted to change the position of the liquid level into an electrical signal. The actual position of the liquid is displayed digitally by the display instrument. The floating ball level gauge can achieve long-range detection and control of the liquid level.

Guess you like: Float Level Sensor Operating Principle

Float level switch working principle

The float level switch is actually equivalent to a limit switch.

When the liquid level is low, the low liquid level switch is closed to control the water pump to turn on and add water.

When the high liquid level is reached, the high liquid level switch is closed to control the water pump to stop.

Different float level switches are different, some are normally open and some are normally closed. Just pay attention when wiring.

The principle of the float switch is as follows:

Liquids have buoyancy, and the float system (generally with corresponding auxiliary equipment) is made according to the buoyancy of the liquid.

When the liquid level rises, the float system rises accordingly, and similarly when the liquid level falls, it also drops accordingly.

When it rises or falls to the set position, the float system will hit the limit switch (or other microelectronic equipment) in the set position.

So that the travel switch sends out an electric signal, and the electric control device will act immediately when receiving the electric signal, cut off or connect the power supply, forming an automatic control system.

It is basically a reed switch structure, with a movable float on the outside and a magnet inside the ball. When the magnet gets close to the reed pipe by buoyancy, the contacts in the reed pipe are turned on or off.

The principle of the reed switch is to repel the same magnetic poles and attract different magnetic poles.

The switch of the reed switch in the liquid level switch controls the corresponding operating mechanism to form a complete set of circuits. Such as: liquid level display, automatic liquid filling, liquid full alarm and so on.

Extended reading: Capacitive water level sensor

Non Contact Liquid Level Sensor

Posted on October 21, 2020 by KimGuo11

The Non Contact Liquid Level Sensor is not in contact with the measured medium. The Non Contact Liquid Level Sensors provided by Sino-Inst is not Gravity Non-contact Liquid Level Sensors. It is the liquid level sensor used in industrial tanks, reservoirs, and open channels. There are mainly ultrasonic level sensors and radar level sensors.

Featured Non Contact Liquid Level Sensors

**ULT-100A Ultrasonic Level Transducer**

**ULT-200A Ultrasonic fuel tank level sensor**

**SI-FMF11 FMCW Radar Level Transmitter 120GHz**

**SI-FMF13 FMCW Radar Water Level Sensor**

**SIRD-802 Radar Level Sensor for Corrosive Liquids**

**SIRD-901 Radar Corrosive Liquid Chemical Level Sensor**

**SIRD-905 Horn Antenna Radar Tank Level Sensor**

**SIRD-803 Radar Oil Tank Level Sensor**

In the automated production process, in order to ensure the consistency of product quality, the time when the production process is directly monitored and intervened by humans has gone.

Liquid level measurement and monitoring play an increasingly important role. It can be said that liquid level measurement and monitoring It directly affect the quality of the product and even whether the production process can proceed smoothly.

Contact measurement
A measuring method in which the sensing element of a measuring tool or measuring instrument obtains measurement information through direct contact with the measured surface.

Non-contact measurement
Non-contact measurement is based on photoelectric, electromagnetic, and other technologies. Without touching the surface of the object to be measured, a measurement method to obtain information on the surface parameters of the object.

Extended reading: Ultrasonic liquid level sensors

Methods of liquid level measurement:

There are mainly the following methods and principles for measuring liquid levels in the industrial field.

Direct display category. Such as glass tube, glass plate, etc.;
Floating ball class. Such as magnetic flaps, small floats, connecting rod floats, cable floats, side-mounted floats, continuous floats, etc.
Contact induction class. Capacitance level gauge, magnetic to telescopic level gauge, pressure type level gauge, etc.;
Non-contact type. Ultrasonic level gauge, radar wave level gauge, etc.

Guess you like Continuous Float Level Sensor & Switches

Liquid level measurement of sealed tank
Liquid level detection of fire storage tank
Liquid level measurement of open tank
Liquid level detection in open channels, rivers, reservoirs, etc.

Extended reading: Radar Non Contact Water Level Sensor

Ultrasonic Level Sensor Working Principle

The working principle of the ultrasonic liquid level sensor is:

Ultrasonic transducer (probe) emits high-frequency pulse sound waves, and the surface of the measured level (material) is reflected back. The reflected echo is received by the transducer and converted into an electrical signal. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object.

The relationship between the sound wave transmission distance S and the sound speed C and the sound transmission time T can be expressed by the formula: S=C×T/2.

The probe part emits ultrasonic waves, which are then reflected by the liquid surface. The probe part is received again. The distance from the probe to the liquid (object) surface is proportional to the elapsed time of the ultrasonic wave:
hb = CT2
Distance [m] = time × speed of sound/2 [m]
The temperature compensation formula of sound velocity:
Ambient sound velocity = 331.5 + 0.6 × temperature

Read More about Ultrasonic Level Sensing

Radar Level Measurement: Measuring Principle

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.

Ultrasonic liquid level sensors realize the non-contact continuous detection of liquid level.

Ultrasonic liquid level sensors echo sounding sensors for measuring liquid level. And converting it to an electrical signal to send to other instrumentation. Ultrasonic Level Transmitters & Ultrasonic Level Sensors can be used for Non-intrusive level detection of sealed tanks. It can be used for liquid level detection of unsealed tanks and open channels such as rivers.

Hope you can purchase Ultrasonic liquid level sensors at the best price after reading this:

Extended Reading: Procurement Guide for Ultrasonic liquid level sensors

Liquid Level Gauge also called Liquid level indicator. Liquid Level Gauge has contact and non-contact type. Here mainly discusses the non-contact Liquid Level Gauge, which is used for CO2 cylinder level measurement.

Portable co2 bottle liquid level gauge uses ultrasonic non-contact measurement technology. Detect and display the presence or absence of the Co2 cylinder liquid level. The Digital portable liquid level gauges are designed to offer a simple, accurate, rapid and reliable method. Determining the liquid level of high or low pressure CO2, Halon, FM200, Propane, Novec 1230 and any liquefied gas under pressure. No need to move or weigh the cylinders.

Ultrasonic Level Switch-External Mounted

Ultrasonic Level Switch, External Mounted (referred to as “external level switch”) is a new type of level measurement alarm device. Ultrasonic Level Switch is mainly used to detect the liquid level of the storage tank. It can realize the upper and lower limit alarm or monitor whether there is liquid in the pipeline (dry protection). The material of the storage tank can be various metals, non-metals or non-foamed plastics. The wall thickness can be Up to 70mm.

Ultrasonic Level Switch is not affected by factors such as medium density, dielectric constant, conductivity, reflection coefficient, pressure, temperature, precipitation, etc. It is suitable for various liquid levels in the pharmaceutical, petroleum, chemical, electric power, food and other industries Engineering control. Ultrasonic Level Switch is the ideal choice for the detection of toxic, highly corrosive, and dangerous liquid level.

Ultrasonic Non-contact Liquid Level Controller

The Liquid Level Controller is attached to the outside of the tank. Non-contact detection of tank liquid level. Liquid Level Controller supports liquid level alarm, fault alarm, and 485, Modbus, 4-20mA, FoundationFieldBus, PROFIBUS or Hart.

Liquid Level Controller is installed outside the tank. The HS-ULC-Pro Liquid Level Controller works based on the principle of ultrasonic waves, and is also called “externally attached liquid level switch. It is mainly used to detect the liquid level of the storage tank, and its sensor (digital probe) acts on the outer wall of the storage tank. It supports upper and lower limit alarms, tanks Body temperature display or monitor whether there is liquid in the pipeline. Liquid Level Controller is suitable for liquid level process control in the pharmaceutical, petroleum, chemical, electric power and other industries. For the monitoring of toxic, highly corrosive and dangerous liquids, HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller is an ideal choice.

Extended reading: Diesel fuel tank level gauges & indicators

All of the above are Non Contact Liquid Level measurement techniques. If you need to contact the medium to measure, you can consider using Liquid level float switches & sensors.

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

Frequently
Asked
Questions

Help Center

The representative products of non-contact liquid level measuring instruments are ultrasonic level meters and intelligent radar level meters. The working principle is to calculate the distance between the sensor and the measured object through the time of transmitting the signal and receiving the signal. Since the propagation speed in the air is constant, the distance between the liquid level sensor and the bottom of the container is constant, and the liquid level of the measured object can be known.

The non-contact level sensor means that the level can be detected without contacting the liquid. Under this advantage, the application field of the non-contact liquid level sensor has been greatly expanded.

Ultrasonic technology is not only used to measure level, but also can be used to measure depth.

The sensor that can measure the liquid level is the liquid level sensor. There are many kinds of common liquid level sensors. For example: float level sensor, hydrostatic level sensor, ultrasonic level sensor, radar level sensor, etc.

Different types of liquid level sensors work based on different principles.

For example, a commonly used water level sensor:
Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a pressure sensor that measures liquid level. The hydrostatic submersion type liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. The isolated diffused silicon sensitive element or ceramic capacitive pressure sensitive sensor is used. Convert static pressure to electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal (usually 4~20mA/1~5VDC).

Procurement Guide: Ultrasonic liquid level sensors

Posted on October 16, 2020 by KimGuo11

Ultrasonic liquid level sensors realize the non-contact continuous detection of liquid level.

Hope you can purchase Ultrasonic liquid level sensors at the best price after reading this Procurement Guide.

Featured Ultrasonic liquid level sensors

You can choose the appropriate Ultrasonic liquid level sensors according to your measurement requirements.

Used to seal tanks and fire tanks. For example CO2 tanks, Halon, FM200, Propane, Novec 1230 and any liquefied gas under pressure.

Portable Ultrasonic Liquid Level Indicator

Portable Ultrasonic Liquid Level Indicator allows you to conveniently detect the level of liquid available in a container /cylinder/pipe/tank. Ultrasonic principle, Non-contact.

Reference price: USD 1200-1800.00/pc

Used as a non-intrusive tank level gauge. For example Liquid ammonia, liquid chlorine, hydrochloric acid, bromine, chlorethylene, sulfuric acid, freon, and nitirc acid, etc.

Reference price: USD 3700-6700.00/pc

Reference price: USD 1200-2800.00/pc

Reference price: USD 4400-8955.00/pc

Used as an open-hole tank and open liquid level. Such as: fuel tank, open channel liquid level. River level, etc.

**Portable Ultrasonic Water Depth Gauge**

Extended reading: Guide to Ultrasonic Level Transmitters

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.

The working principle of the ultrasonic liquid level sensor is:

The relationship between the sound wave transmission distance S and the sound speed C and the sound transmission time T can be expressed by the formula: S=C×T/2.

Image Source： https://www.coulton.com/beginners_guide_to_ultrasonic_level_transmitters.html

Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor

Liquid level sensor is a kind of measuring instrument used to measure the change of liquid level in the container. It can display the change of liquid level intuitively and linearly. Among them, the magnetic float level sensor is a kind of one that can display on-site and output analog signals. Kind of level gauge.

There are many types of level gauges. There are intuitive displays such as: glass plate level gauges, glass tube level gauges, etc. There are also magnetic float level gauges, float level gauges, radar level gauges, ultrasonic level gauges, Level gauges with electronic signals such as radio frequency admittance level gauges.

Ultrasonic level gauge is a sensor that emits ultrasonic waves. The sound waves are reflected by the liquid surface and then received by the same sensor. They are converted into electrical signals by piezoelectric crystals or magnetostrictive devices. The time between the transmission and reception of the sound waves is calculated to calculate the sensor The distance to the surface of the liquid being measured.

Very short microwave pulses with very low energy emitted by the radar level gauge are transmitted and received through the antenna system. Radar waves travel at the speed of light. The running time can be converted into a level signal by electronic components.

The radar level gauge is more accurate than the ultrasonic level. And the ultrasonic level gauge is not accurate when measuring the liquid level that produces the foam. Because the ultrasonic wave is reflected back when it hits the foam, the measured level is higher than the actual level. So The radar level gauge is used for the liquid level that is prone to foam. The microwave used by the radar level gauge can pass through foam. So it can also be used for level measurement of liquids that are prone to foam.

Non-Contacting Radar Level Measurement

Extended reading: Radar Non Contact Water Level Sensor

Ultrasonic Level Sensor and Transmitter

The working principle of the ultrasonic level gauge is that the ultrasonic transducer (probe) emits high-frequency pulsed sound waves. When encountering the surface of the measured material (material), it is reflected and folded back, and the reflected echo is received by the transducer and converted into an electrical signal. The propagation time of a sound wave is proportional to the distance from the sound wave to the surface of the object.

The relationship between the sound wave transmission distance S, the sound speed C and the sound transmission time T can be expressed by the formula: S=C×T/2.

Ultrasonic sensors are also ultrasonic transducers, that is, probes.

Ultrasonic sensors are mainly composed of piezoelectric wafers. It can both transmit and receive ultrasonic waves. Low-power ultrasonic probes are mostly used for detection. It has many different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), Lamb wave probe (Lamb wave), dual probe (one probe reflection, one probe reception) Wait.

Ultrasonic transmitter refers to an instrument that can convert liquid level detection signals into analog signals or other signals. For example, we can require the ultrasonic level transmitter to output a 4-20mA signal.

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

Ultrasonic Level Sensor 4-20mA

4-20mA is the common output signal of ultrasonic level gauge. To be precise, it can be divided into 2-wire, 3-wire, and 4-wire.

Two-wire system: The two-wire ultrasonic level meter shares a loop for power supply (DC24V only) and signal output (DC4-20mA). Only two wires are used and it is the standard transmitter form. The downside is that the transmit power is weak. Not suitable for liquid level measurement with large fluctuations. When the liquid level has a large volatilization. Measurements are also not ideal.

Three-wire system: The three-wire ultrasonic level gauge is actually a four-wire system. Its power supply (only DC24V) is separated from the signal output (DC4-20mA) loop. Use two lines each. When their negative terminals are connected in common, three wires are usually sufficient. The advantage is that the transmit power is larger. Suitable for liquid level and material level measurement in a variety of conditions. The effect is better.

Four-wire system: The power supply (DC24V or AC220V) is separated from the signal output (DC4-20mA) loop. The advantage of using two wires each is that the transmit power is greater. At the same time, it provides high and low relay output, adding new functions.

Extended reading: Non-Contact Level Measurement

Ultrasonic Level Sensor for Solids

In theory, ultrasonic liquid level sensors can be used to detect solid material levels. However, the general range should be reduced. The particles are uniform and the thickness is moderate. For example, corn, sand, detection is still very good. But the range is almost halved. If the particles are too fine, such as flour, cement powder will not work well.

Some ultrasonic level gauges can detect solids and liquids. For example, VEGA’s ultrasonic level meter does not distinguish between solid and liquid models.

And some brands of ultrasonic level gauges can only measure liquids, such as Siemens ultrasonic level gauges. It distinguishes the models that measure liquids and the models that measure solids. There are also models that can measure solid liquids.

Extended reading: Magnetostrictive Level Transmitter Advantages And Disadvantages

Laser level transmitter for solids

Non Invasive Level Measurement

Non Invasive Level Measurement means that the liquid level sensor is attached to the outside of the tank to detect the liquid level. In this way, there is no need to perforate the tank. Installation and monitoring are very convenient.

At present, the most commonly used Non Invasive Level Measurement is the ultrasonic sensor.

Non Intrusive Level Gauge

**Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank**

In addition to the Non Intrusive Level sensors at the top of this article. We also have a Non Intrusive Level Gauge. This externally mounted ultrasonic level sensor is mostly used for truck fuel tank level monitoring. Of course, it can also be used for other tank level monitoring according to the parameters.

Ultrasonic oil level sensor uses the principle of ultrasonic detection to detect the fuel level of the fuel tank. The fuel volume data is transmitted to the background monitoring system to achieve real-time monitoring of vehicle fuel consumption. Ultrasonic oil level sensor is mainly used in the field of Internet of Vehicles to monitor the change of fuel level in the fuel tank in real-time to achieve fuel level detection. It can be used to prevent fuel stealing, optimize operating costs, optimize driver driving behavior, and assist statistical decision-making. At the same time, this product can also be used in chemical, water conservancy, storage tanks, and other fields that require level detection.

More Non Contact Liquid Level Sensors

**SIRD-902 Drop Antenna Radar Tank Level Sensor**

**SIRD-902T Microwave Radar Liquid Level Sensor**

**SIRD-904 Radar Level Gauge with Parabolic Antenna**

**SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor**

**Alternative to VEGAPULS 64-80GHz FMCW Level Radar**

**SIRD-806 Radar High Temperature Level Sensor**

Differential pressure(DP) level transmitte

Remote Seal Differential Pressure Transmitter

Frequently
Asked
Questions

Help Center

Ultrasonic liquid level detector is actually an ultrasonic sensor for liquid level detection.

Extended reading: Sludge Blanket Level Detector Appliactions

Ultrasonic liquid level sensor is a digital liquid level meter controlled by microprocessor. Ultrasonic pulses are emitted by sensors (transducers) during the measurement. The sound waves are picked up by the same sensor after being reflected off the surface of the liquid. Converted into electrical signals by piezoelectric crystals. And the distance between the sensor and the liquid surface to be measured is calculated from the time between the emission and reception of the sound wave. Because of the non-contact measurement. The measured medium is almost unlimited. It can be widely used to measure the height of various liquid and solid materials.

The working principle of the ultrasonic water level sensor is that the ultrasonic transducer (probe) emits high-frequency pulsed sound waves when it encounters the water surface and is reflected and folded back. The reflected echoes are received by the transducer and converted into electrical signals. The propagation time of a sound wave is proportional to the distance from the sound wave to the surface of the water.

Ultrasonic water level sensor is often used for water level monitoring in sewage stations, fire water tanks, reservoirs, etc.

Yes, Ultrasonic sensors for liquid level monitoring are the most common applications.

Extended reading: Hydrostatic Level Measurement

Related Blogs

Material Level Indicators
The material level indicator refers to an instrument for real-time detection of changes in the height of solid materials in a container. Material level indicator is also known as material…
The Secret of Water Level Control
Water level control refers to the control of high and low water levels by mechanical or electronic methods. It can control solenoid valves, water pumps, etc. to become an automatic…
Float Switch for Water Tank: Wiring Diagrams + Troubleshooting
Updated: April 16, 2026 | By Sino-Inst Engineering Team A float switch on a water tank is just a mechanical contact in your pump’s power loop. When the float rises,…
A New Choice for Boiler Drum Level Measurement – Guided Wave Radar
Boiler Drum Level Measurement is very important and necessary in major factories. Drum level is an extremely important control parameter. It is an important guarantee for the production of high-quality…
Wastewater Level Sensor for Septic Tanks and Sewage Holding Tanks: Selection and Installation
Updated: April 23, 2026 Septic tanks, sewage holding tanks, and lift station wet wells are the dirtiest service for any level sensor. Solids settle on the bottom. Grease and FOG…
Tech Guide for Non-Contact Radar Type Level Transmitters
What Is Radar Type Level Transmitter? The Radar Type Level Transmitter is a kind of instrument that measures the liquid level in the container by microwave. The Radar Type Level…
Water Level Monitoring Sensor/System for Sewage-Wastewater
Water Level Monitoring Sensors can be used to detect changes in water level. The Water Level Monitoring Sensor and other control equipment work together to form the Water Level Monitoring…
Tank Level Gauges & Indicators
Tank level gauges are instruments used to indicate and control the height of the liquid level in the tank. Commonly used in water storage tanks, oil storage tanks, and underground…
List of Radar Level Sensors
Non-contact radar level sensor Radar level sensors are used for continuous non-contact level measurement of liquids or solids. And convert it into electrical signals. The radar level sensor emits high-frequency…
Magnetic Level Gauge Indicator: How It Works, Types, and When It Beats a Sight Glass
Updated April 24, 2026 by the Sino-Inst Engineering Team A magnetic level gauge is a mechanical indicator that reads liquid level from the outside of a vessel using a magnetic…
Point Level Measurement Sensors
What is Point Level Measurement? Point Level Measurement refers to the use of a point level sensor to detect the material level in a storage tank or silo. Also called…
How Does a Capacitive Liquid Level Sensor Work? (Engineer’s Guide 2026)
Updated: April 15, 2026 A capacitive liquid level sensor detects level by measuring the capacitance change between a probe and the tank wall (or a second probe) as the liquid…
Contact and Non-contact | Capacitive water level sensor
A capacitive water level sensor is often used to measure the water level of the water storage tank. The capacitive water level sensor uses the change of measuring capacitance value…
Sulfuric Acid Storage Tank Level: Radar Antenna & Overfill Guide
Sulfuric acid storage tanks combine three measurement obstacles: corrosive vapor in the headspace, concentration-dependent material compatibility, and regulated overfill protection. Direct-contact float and capacitance probes corrode within months. Non-contact 80…
Capacitive Fuel Level Sensor: Working Principle, Calibration & Selection
A capacitive fuel level sensor measures diesel, petrol, kerosene, or jet fuel by treating the tank as a parallel-plate capacitor and reading the change in capacitance as fuel rises and…
Ultrasonic level transmitter VS Radar level transmitter
Radar level transmitter and Ultrasonic level transmitter are both liquid level measuring instruments. The most obvious difference is that one uses electromagnetic waves and the other uses ultrasonic waves. So,…

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

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

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

KimGuo11

drurylandetheatre.com

CO2 Cylinder | Portable Liquid Level Gauge

Posted on October 13, 2020 by KimGuo11

Updated May 29, 2026 · Sino-Inst Engineering Team

You cannot tell how much CO2 is left in a fire-suppression cylinder by looking at its pressure gauge. A full cylinder and a half-empty one read almost the same pressure. The practical, non-invasive way to verify contents is a portable ultrasonic liquid level gauge that finds the liquid-to-gas boundary on the cylinder wall in under a minute — no weighing, no shutdown.

This guide explains what a portable CO2 cylinder level gauge is, why pressure cannot tell you the level, how the ultrasonic method works, the step-by-step field procedure, and how to choose the right gauge by couplant, accuracy and hazardous-area rating.

What Is a CO2 Cylinder Portable Liquid Level Gauge?
Why Can’t You Use Pressure to Check a CO2 Cylinder?
How Does a Portable Ultrasonic Level Gauge Work?
How to Check a CO2 Cylinder Level Step by Step
How to Choose a Portable CO2 Level Gauge
Where Portable Cylinder Gauges Are Used
Common Mistakes When Checking Cylinder Level
Portable Level Gauges from Sino-Inst
FAQ

What Is a CO2 Cylinder Portable Liquid Level Gauge?

A CO2 cylinder portable liquid level gauge is a handheld ultrasonic instrument that detects the liquid level inside a sealed pressurized cylinder from the outside. You hold its transducer against the cylinder wall, move it up or down, and it tells you whether the spot in front of it is liquid or gas. Where the reading changes is the liquid surface — the contents level.

It is the standard tool for checking CO2, Halon and clean-agent (FM-200, NOVEC) fire-suppression cylinders without removing them or breaking the seal. The same handheld approach covers beverage CO2 tanks, marine CO2 rooms and lab gas cylinders. For built-in continuous monitoring rather than a handheld spot check, the same physics drives our ultrasonic CO2 level indicator.

Why Can’t You Use Pressure to Check a CO2 Cylinder?

You cannot use pressure because CO2 in the cylinder is a saturated liquid-vapor mix, and its pressure stays nearly constant regardless of how much liquid remains. As long as any liquid CO2 is present, the vapor above it sits at its saturation pressure for the current temperature — about 57 bar at 20 °C — whether the cylinder is 90% full or 10% full.

The pressure only starts to fall once the last of the liquid has boiled off and only gas is left — at which point the cylinder is already nearly empty and useless for fire suppression. So a healthy-looking pressure gauge tells you the cylinder is pressurized, not that it still holds enough agent. That is exactly why codes require a contents check by weight or by ultrasonic level, not by pressure.

How Does a Portable Ultrasonic Level Gauge Work?

A portable ultrasonic level gauge works by sending an ultrasonic pulse through the cylinder wall and reading how the signal reverberates inside. Against liquid, the sound couples into the dense medium and the echo pattern is one way; against gas, the wall rings differently because gas barely carries the pulse. The instrument turns that difference into a clear liquid-or-gas indication for the exact spot under the transducer.

Moving the transducer down the cylinder, you find the height where the indication switches — that is the liquid surface. The method is non-invasive, non-destructive and works without shutting down the system, typically resolving the boundary to about ±1.5 mm and completing a cylinder in under 30 seconds. It is the same transit principle behind ultrasonic liquid level sensors, packaged for handheld spot checks.

How to Check a CO2 Cylinder Level Step by Step

Checking a cylinder takes well under a minute once you have the gauge and couplant ready. Follow these steps for a reliable reading.

Clean the contact band. Wipe a vertical strip on the cylinder wall with a damp cloth so the transducer sits on bare, smooth metal — paint flakes and grime scatter the pulse.
Apply couplant. Smear a strip of ultrasonic gel (or petroleum jelly) down the cleaned band. Couplant removes the air gap between transducer and wall; without it the pulse never enters the cylinder. In hot environments water works but evaporates and must be reapplied.
Start low and scan upward. Press the transducer to the cylinder near the bottom (expected liquid) and slide it slowly upward, watching the liquid/gas indication.
Find the switch point. The height where the reading flips from liquid to gas is the surface. Mark it.
Compare to the fill mark. Measure that height against the cylinder’s full-fill reference. A drop below the minimum means the cylinder needs refilling or replacing.

For tanks and vessels too large for a handheld pass, switch to a mounted sensor — see ultrasonic tank level sensors or, for very cold service, a cryogenic level sensor.

How to Choose a Portable CO2 Level Gauge

Choose on four practical points rather than price, because a cheap gauge that fails in your environment costs more than it saves.

Accuracy and readout. A boundary resolution around ±1.5 mm is the practical target. A digital readout is easier to judge than an analog needle when the boundary is faint.
Single-point vs continuous. A handheld single-point gauge is right for periodic inspection rounds. If you need permanent monitoring on a critical cylinder, fit a continuous indicator instead.
Couplant and surface. Confirm the gauge works on your cylinder’s wall thickness and curvature, and that the couplant you can source on site suits the ambient temperature.
Hazardous-area rating. For engine rooms, offshore or flammable-storage areas, specify an intrinsically safe (ATEX/IECEx) model. A standard unit is not permitted in a classified zone.

Where Portable Cylinder Gauges Are Used

Portable ultrasonic gauges are used anywhere liquefied gas sits in a sealed cylinder that must be verified without opening it. The biggest use is fire protection — CO2, Halon and clean-agent banks in server rooms, engine spaces and machinery rooms — where regulations require periodic proof of contents.

Beyond fire systems, the same gauge checks marine CO2 flooding cylinders during surveys, beverage and brewery CO2 tanks, laboratory gas cylinders, and refrigerant drums. When a site grows past spot checks into permanent dashboards, the data ties into a tank level monitoring system for logging and alarms.

Common Mistakes When Checking Cylinder Level

Most bad readings come from technique, not the instrument. Four mistakes account for the majority.

Trusting the pressure gauge. The classic error — assuming a normal pressure means a full cylinder. It does not, because saturation pressure is flat until the liquid is gone.
No couplant or a dry strip. Without gel the pulse never enters the wall and every spot reads “gas.” In heat, water couplant dries out mid-scan and must be refreshed.
Scanning over paint or a weld seam. Coatings and seams scatter the signal and create false boundaries. Use a clean band of bare metal away from welds.
Reading at the wrong temperature reference. Cylinder fill marks assume a reference temperature. After a hot or cold soak, let the cylinder equilibrate or correct for it. For buried or hard-to-reach vessels, see how to check level in underground tanks.

Portable Level Gauges from Sino-Inst

Ultrasonic CO2 Level Indicator

Non-invasive liquid/gas boundary detection for CO2 and clean-agent fire cylinders. Portable spot check or fixed monitoring, ±1.5 mm, results in under 30 seconds.

Cryogenic Level Sensor

For liquid nitrogen, LNG and other cryogenic tanks where ultrasonic spot checks do not reach. Continuous level output for very low temperature service.

External Tank Level Indicator

Clamp-on ultrasonic level indication for sealed tanks and drums — ammonia, LPG, crude oil. No tapping, no shutdown, reads through the wall.

FAQ

How do you check the level of a CO2 cylinder?

Use a portable ultrasonic liquid level gauge. Clean a vertical strip on the cylinder, apply couplant, press the transducer to the wall near the bottom and slide it upward. The height where the reading flips from liquid to gas is the contents level. It takes under 30 seconds and does not require removing the cylinder.

Why can’t I use the pressure gauge to check CO2 level?

Because CO2 is a saturated liquid-vapor mix, the pressure stays roughly constant (about 57 bar at 20 °C) as long as any liquid remains, regardless of how much is left. Pressure only drops once the cylinder is nearly empty, so it cannot tell you the contents level.

How accurate is ultrasonic cylinder level testing?

A portable ultrasonic gauge typically resolves the liquid/gas boundary to about ±1.5 mm, which is more than enough to confirm whether a cylinder is above or below its minimum fill. Accuracy depends on a clean contact surface and proper couplant.

What couplant should I use for ultrasonic cylinder testing?

Standard ultrasonic coupling gel is best. Petroleum jelly works as a substitute, and water works in a pinch but evaporates quickly and must be reapplied in hot conditions. The couplant fills the air gap so the pulse can pass into the cylinder wall.

Is ultrasonic testing an approved alternative to weighing cylinders?

Ultrasonic liquid level testing is a widely accepted non-invasive method for verifying fire-suppression cylinder contents without removing them for weighing. Always follow the standard and authority having jurisdiction, but ultrasonic checks are commonly used to meet periodic contents-verification requirements.

Can one portable gauge check different cylinder sizes?

Yes, within its wall-thickness and diameter range. The same handheld gauge typically covers a range of CO2 and clean-agent cylinders. Confirm the gauge’s rated wall-thickness window matches your cylinders, and choose an intrinsically safe model for classified areas.

How do I choose and source the right portable level gauge?

Send your cylinder type, agent (CO2, FM-200, Halon), wall thickness, area classification and whether you need handheld or continuous monitoring to our Sino-Inst engineering team, or reach our application engineers through the contact page. We will recommend a model and reply within one business day.

Need a portable ultrasonic gauge for CO2 or clean-agent fire cylinders, or continuous cylinder monitoring? Send your cylinder details and area classification through the form below. Our level engineers will respond within one business day with a recommendation and quote.

About This Article

Written and technically reviewed by the Sino-Inst engineering team — last reviewed 2026-05-29 (AI-assisted drafting). Based on liquid-CO2 saturation behavior and ultrasonic non-invasive testing, plus field cylinder inspections. Questions? reach our application engineers.

Request a Quote

Please enable JavaScript in your browser to submit the form

KimGuo11

drurylandetheatre.com

High Frequency Dynamic Pressure Sensor

Posted on October 13, 2020 by KimGuo11

Dynamic pressure sensor, the transmitter is a high frequency sensor.

The high frequency dynamic pressure sensor adopts silicon stack silicon technology. At the same time, it has high responsiveness. At the same time, it also has high accuracy in low frequency or static data. The high-frequency dynamic pressure sensor has its own hybrid temperature compensation, and the special processing can reach 2000℃ instantaneously. It can provide stable performance in a wide temperature range, with good linearity, high natural frequency, short rise time and wide excellent response frequency band.

Sino-Inst offers a variety of Dynamic Pressure Sensors for pressure measurement. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Sensors

Features of High Frequency Dynamic Pressure Sensor

Wide measuring medium range
Wide pressure measurement range
High natural frequency up to 2MHz
Stable work
Strong anti-interference ability
Original imported components, reliable performance.
Small size, light weight, complete types, high cost performance

Read more about: What is a pressure sensor and how it works?

Specifications of High Frequency Dynamic Pressure Sensor

Measuring range	-100KPa~0~10KPa…200KPa…1MPa…100MPa
Type of pressure	Gauge pressure, absolute pressure, negative pressure
Long-term stability	Typical: ±0.1%FS, maximum: ±0.2%FS/year
Comprehensive accuracy	≤±0.25%FS, 0.5%FS (Comprehensive accuracy includes: linearity + repeatability + hysteresis)
Overload pressure	2 times full scale pressure (100MPa product overpressure is 1.1 times full scale pressure)
Ambient temperature	-20 … +85℃
Medium temperature	-40 … +85℃, special can be -10℃~200℃
Vibration influence	≤±0.01%FS (X, Y, Z axis, 200Hz/g)
Load Resistance	≤(U-12)/0.02Ω
Natural frequency	150KHz~2MHz
Transmitter frequency response	0~1KHz~200KHz
Rise Time	0~1mS~2μS
Zero temperature drift	Typical: ±0.02%FS/℃, maximum: ±0.05%FS/℃
Sensitivity temperature drift	±0.02%FS/℃, maximum: ±0.05%FS/℃
Resolution	Infinitely small in theory, usually 1/100000

Medium	Gas or liquid compatible with 316 stainless steel
Power supply	Transmitter power supply: 12~36VDC (generally 24VDC), ±15VDC switching power supply or linear power supply Sensor power supply: constant current: 1mA~4mA; constant voltage: 5VDC~24VDC
Signal output	Analog: 4~20mA, 1~5 V DC, 0~10VDC, 0~5V DC Sensor output: 1.5mV~15mV/V
Insulation resistance	100MΩ, 500VDC
Electrical protection	Reverse polarity protection, anti-electromagnetic interference
Liquid contact material	316L stainless steel
shell material	304 stainless steel
Process connection	M20*1.5, G1/4, flush film, other threads can be designed according to customer requirements
Electrical connection	The cable is IP67 and the connector connection is IP65
weight	0.25KG

Applications of High Frequency Dynamic Pressure Sensor

Military engineering
Chemical explosion test
Petroleum prospecting and well testing
Fluid mechanics
Internal combustion engine system
aerodynamics
Scientific tests such as hydraulic power machinery test
Chemical explosion test

More Featured Pressure Sensors

**SI-303 Low-Pressure Transducer**
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ～ 2.5kPa to 0 ～ 30kPa measurable.

**SI-350 Sanitary Pressure Transmitter**
Sanitary Pressure Transmitter, also called tri clamp pressure transmitter,
is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor.

**SI-300 Pressure Transducer 4-20mA/Voltage**
The 4-20mA/ Voltage Pressure Transducer,
also called pressure transmitter 4-20mA,
is a pressure sensor with4-20ma/Voltage output.

**SI-390 Industrial Pressure Transmitter**
Pressure transmitters for general industrial applicaitons. -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa ~150MPa. 0.1% FS, 0.25% FS, 0.5% FS. 4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire system)

**SI-512H High Temperature Pressure Sensor**
High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.

**SIJC-1000HSM-Silicon Pressure Sensor**
Silicon pressure sensor, also known as Diffused silicon pressure sensor. Silicon pressure sensors are low cost.

**SI-706 Combined Pressure and Temperature Sensor-Dual function**
Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.
Thermocouple types: J, K, E type or PT100 platinum resistance. Two outputs do not affect each other.

**SI-338 Ceramic Pressure Sensor**
Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base. Cost-effective. Support OEM processing. 0-0.2MPa -…- 40MPa

Extended reading: Static pressure vs dynamic pressure vs total pressure

Level Measurement: Liquid Chlorine Storage Tanks

Posted on October 12, 2020 by KimGuo11

Monitoring the level of liquid chlorine storage tanks is a common problem in the chlor-alkali industry.

In the chlorine production process, sulfuric acid dehydration is used to dry the chlorine. There will be a small amount of acid mud in the liquid chlorine. Liquid chlorine is highly toxic and corrosive. Liquid chlorine storage tank level measurement must take into account the requirements of corrosion resistance, safety requirements, reliability, convenient installation and easy maintenance.

This article combines the application and comparison of the actual use of the liquid chlorine storage tank level measurement level gauge, which has practical guiding significance for the selection of the liquid chlorine storage tank level gauge in the chlor-alkali industry under the existing technical conditions.

Liquid Chlorine Storage Tanks chemical properties

Liquid chlorine is a yellow-green liquid. Boiling point -34.6℃. Melting point -103℃. It is vaporized into gas under normal pressure. Inhalation of the human body can be severely toxic, severely irritating and corrosive. It burns and explodes when mixed with other flammable gases in sunlight. Chlorine is a very reactive element and can react with most elements (or compounds).

Liquid chlorine is the basic chemical raw material, which can be used in metallurgy, textile, papermaking and other industries, and is the raw material for the synthesis of hydrochloric acid, polyvinyl chloride, plastics, and pesticides. Packed in high-pressure steel cylinders.

Hazard characteristics: Liquid chlorine will not burn, but it can support combustion. Generally combustible materials can be burned in chlorine gas, and general flammable gas or steam can also form explosive mixtures with chlorine gas.

Chlorine gas can react violently with many chemicals such as acetylene, turpentine, ether, ammonia, fuel gas, hydrocarbons, hydrogen, metal powder, etc. to explode or generate explosive substances. It is almost corrosive to metals and non-metals.

Liquid chlorine is generally used after gasification and has a wide range of uses. It is a strong oxidant. It is used for bleaching in the textile and paper industry, purification and disinfection of tap water, refining of magnesium and other metals, and production of pesticides, detergents, plastics, rubber, Various chlorine compounds such as medicine.

Liquid chlorine is a highly toxic substance, and the emergency code number is 31001. Should be stored in a cool, ventilated warehouse, special warehouse for special storage. Do not co-store or carpool transportation with combustibles, explosives and ammonia.

Level gauges types used for tank level measurement

In the tank level measurement, the following types of level gauges have a large number of practical applications:

1.Buoyancy level gauge

Such as float level gauge, flap level gauge, float level gauge, floating plate level gauge, float level gauge, steel belt level gauge. This type of buoyancy level gauge has measurement accuracy. However, the on-site installation and structure are more complicated, there are many mechanical parts, and the daily maintenance amount is very large in the actual application process.

2.Pressure type level gauge

Pressure transmitters, single-flange level transmitters, and drop-in level transmitters are often used for liquid level measurement in open vessels. Differential pressure transmitters and remote double-flange differential pressure transmitters are often used for liquid level measurement in closed vessels. Differential pressure level gauges are easily affected by medium density and temperature changes during measurement, and the maintenance of accessories is large. If the liquid level of a strong corrosive medium is measured, the instrument is expensive.

Extended reading: Hydrostatic Level Measurement

3.Microwave level meter

Ultrasonic level gauges, radar level gauges, and guided wave radar level gauges are all microwave level measuring instruments that can be used for solid and liquid level measurement. Although these level gauges have advanced technology and improved measurement accuracy, they are suitable for pressure vessels that store light hydrocarbons, liquid ammonia, and liquid chlorine.

Due to the low dielectric constant of the gas phase medium, volatility and a large number of droplets, it will absorb and affect the reflection of electromagnetic waves. Interference to the level measurement of the microwave level meter, resulting in unstable measurement value of the level meter.

Extended reading: What is the difference between ultrasonic and radar level transmitters?

Featured Level meters

LD series Rigid Probe Magnetostrictive Level Transmitter

LR series Integral flange Magnetostrictive level sensor

SIRD-702 GWR Corrosive Liquid Chemical Level Sensor

If you need to measure river water level, open channel level, etc. The Ultrasonic Liquid Level Sensor can be used for non-contact continuous level monitoring.

Application of different level gauges in Liquid Chlorine Storage Tanks

Practice is the only criterion for testing truth. Each level gauge has its advantages and disadvantages, and the application performance of different level gauges under the same working conditions is not the same.

In this article, Sino-Inst shares with you the application experience of different types of level gauges in the level measurement of liquid chlorine storage tanks in the plant.

1.Application of radioactive level gauge in Liquid Chlorine Storage Tanks

The cobalt 60 radioactive level gauge is used to perform high-limit measurement and alarm on the liquid level of the liquid chlorine storage tank.
The specific application is: installing cobalt 60 radiation sources and receiving devices on both sides of the high point of the liquid chlorine storage tank.

The radioactive level gauge produces different amounts of radiation when the storage tank is full or dissatisfied. The meter judges whether the liquid level of the storage tank exceeds the limit according to the change of the radiation amount and sends out the corresponding switch alarm signal.

The cobalt 60 radioactive level gauge is installed on the outside of the storage tank and does not come into contact with the liquid chlorine. There is no potential for chlorine leakage, and the position measurement is accurate and reliable. However, the radioactive level gauge cannot realize continuous measurement and monitoring of the liquid level and the cobalt 60 radioactive source is easy to check Instrument maintenance workers cause personal hazards and are therefore not suitable for production.

2.Application of top-mounted float level gauge in Liquid Chlorine Storage Tanks

The top-mounted float level gauge is used to measure the liquid level of the liquid chlorine storage tank. The top-mounted float level gauge is inserted into the liquid chlorine storage tank from the top.

When the liquid level in the liquid chlorine storage tank changes, the float floats up and down along the measuring tube with the change of the liquid level. The magnetic steel in the anti-corrosion float continuously attracts the reed switch relays in different positions. The liquid level is shown by the indicator position.

The top-mounted float level gauge works well in the initial stage of use. But with the passage of time, its drawbacks have gradually emerged. The top-mounted float level gauge needs to be in contact with liquid fluorine when measuring, and it is prone to fluorine gas leakage. Site environment It is highly corrosive, and the measuring rod of the reed switch relay is often desoldered due to corrosion. The failure rate is very high and the maintenance workload is large, which affects normal production.

The acid mud contained in the liquid chlorine adheres to the floating ball steel pipe. It causes the floating ball to move and even gets stuck, causing the level gauge float to not follow the liquid level change normally. A false liquid level is generated and the process production operation is affected. It is not fully applicable to liquid chlorine storage tank level measurement.

3.Application of capacitive level gauge in Liquid Chlorine Storage Tanks

Use a capacitive level meter to measure the level of the liquid chlorine storage tank. The capacitive level gauge is inserted from the top of the liquid chlorine storage tank, and the capacitance of the level gauge changes in proportion to the change height of the liquid chlorine level in the storage tank. This principle is used to achieve continuous measurement of the liquid chlorine storage tank level.

Capacitance level meter can meet the continuous measurement of liquid chlorine storage tank level, but it has the following disadvantages:

The measuring electrode of the capacitance level meter needs to be inserted into the liquid chlorine storage tank, and chlorine leakage is likely to occur during installation or disassembly, which endangers personal safety.

After the capacitance level gauge has been working for a period of time, the acid mud contained in the liquid chlorine will adhere to the inner and outer electrodes of the capacitance level gauge, causing changes in capacitance and large errors in measurement.

Due to the high toxicity of chlorine gas, the malfunctioning meter cannot be disassembled and repaired at any time, causing the malfunction meter to be unable to be repaired for a long time.

Due to the above reasons, the capacitance level meter is gradually eliminated after a period of use.

4.Application of side-mounted magnetic flap level gauge in liquid chlorine storage tanks

The side-mounted magnetic flap level gauge is connected to the storage tank with a measuring tube. The measuring tube is equipped with a magnetic float. The outside of the tube is composed of two-color porcelain rollers side by side to form an indicator. The magnetic float moves up and down with the change of the liquid chlorine level, driving the magnetic roller Rotate. The magnetic roller therefore changes color to indicate the liquid level.

The side-mounted magnetic flap level gauge has a good effect in the initial stage of use. Because the indicator is completely isolated from the medium, the effect of corrosion is overcome.

The magnetic float is sealed in the measuring tube to eliminate the hidden danger of chlorine leakage and ensure safety.

The side-mounted magnetic flap level gauge is accurate and reliable in measurement and indication, with very low failure rate and little impact on production.

The disadvantage is that the measuring tube wall is frozen, and the acid sludge contained in the liquid chlorine will also cause the magnetic float to freeze or jam when working for a long time. This will cause measurement errors. It will seriously affect the process and production operations. Therefore, the liquid chlorine storage tank level cannot be fully applied measuring.

5.The application of external level gauge in Liquid Chlorine Storage Tanks

A. Working principle of external level gauge

The external measuring level gauge is an intelligent field transmitter type instrument. The external measuring level gauge flameproof host is installed near the liquid chlorine storage tank. The measuring head of the external measuring level gauge is tightly attached to the outer wall of the container. It depends on the detection container wall The tiny mechanical vibration on the upper side becomes an electric signal and is transmitted to the external measuring level gauge flameproof host. After this signal is processed, it becomes a digital signal and is sent to the CPU.

The instrument host filters and recognizes the various vibration waves of different modes obtained by the measuring head, and removes signals that have nothing to do with the change of the liquid level. It uses special software to perform complex calculations on the waveform of the signal, and uses artificial intelligence algorithms to calculate it. Analysis. To calculate the liquid level.

Therefore, the external level gauge is to continuously and accurately measure the height of the liquid level in the tank from the outside of the tank. It does not touch the liquid and gas in the tank at all, realizing a true isolation measurement.

Extended Reading: Laser level transmitter for water

B. Advantages of external level gauge

The external level gauge has the following advantages:

①It can be used in the most demanding environment. It can measure liquids under any pressure. It can measure the most toxic liquids. It can measure the most corrosive liquids. It can measure absolutely sterile or extremely pure liquids.

②Safe to use. When measuring toxic, corrosive, pressure, flammable, explosive, volatile, and easy to leak liquids. Because the measuring head and the instrument are outside the container. During installation, repair, and maintenance operations, the operator does not touch the tank The liquid and gas inside are very safe. Even if the instrument is damaged or repaired, there will never be leakage.

③Meet environmental protection requirements. Neither liquid nor gas leaks. It does not pollute the environment and is a green instrument.

④ Installation and maintenance are the most convenient and economical. Because the liquid level gauge does not need to open a hole in the container, does not need a flange, or a connecting pipe, it is very convenient to install and maintain. The external level measuring instrument does not require manual calibration during installation and use, which is very convenient.

⑤High reliability and long service life. Because there are no mechanical moving parts in the measuring head of the liquid level meter and the meter, it is strictly sealed and isolated from the outside world. It will not produce abrasion or corrosion, it is very durable and reliable, and the maintenance workload is very small.

⑥ Accurate measurement. The external level measuring instrument can be continuously and automatically calibrated to ensure the highest measurement accuracy. In addition, the external level measuring instrument is divided into temperature compensation type, its measurement accuracy reaches 1%. Self-calibration type, its measurement accuracy reaches 0.2%. Among them, the self-calibrating liquid level gauge does not need manual calibration.

C. Disadvantages of external measuring liquid level gauge

① There are still some shortcomings of the external measurement type level gauge. The meter itself has a measurement dead zone. The external measurement type level gauge can only display a low level alarm within 200mm of the bottom of the container and cannot indicate an accurate level value. Since the company’s liquid chlorine storage tank level measurement monitoring is mainly to ensure high-level accurate monitoring, this defect does not affect normal use.

After analysis and comparison, it is believed that from the perspective of safe production and maintenance work, the external measurement type level gauge is currently the most suitable instrument for liquid chlorine storage tank level measurement.

②The advantage of the external measurement type level gauge is that it is easy to install, and there will be no hidden dangers of chlorine leakage and corrosion of the instrument.

According to reports from other petrochemical plants: the external measurement type level gauge will also have measurement failures after a period of time, mainly due to changes in the paste medium and gap, which is a common problem. This is also a problem that the tuning fork limit switch can avoid.

Therefore, the biggest obstacle to the application of external ultrasonic level meters is the need to achieve long-term all-weather operation after installation, which is a technical problem.
In addition, for instruments that have problems on site, the supplier must respond to and solve the problems in a timely manner. This is a service problem.

Featured external level gauges in Liquid Chlorine Storage Tanks

HS-2000 External Mounted Ultrasonic Tank Level Sensor- (referred to as “external level gauge”). It adopts advanced signal processing technology and high-speed signal processing chip. It breaks through the influence of container wall thickness. Realizes the height of the liquid level in the closed container True non-contact measurement.

The ultrasonic liquid level sensor (probe) is installed directly under the outer wall (bottom) of the container under test. Calibrate the outer wall of the probe. There is no need to open holes for the container to be tested, easy to install, and does not affect production. It can accurately measure the level of various toxic substances, strong acids, strong alkalis and various pure liquids in high-pressure airtight containers.

The HS-2000 External Mounted Ultrasonic Tank Level Sensor has no special requirements for the material of the liquid medium and the container. The explosion-proof design is adopted to meet the explosion-proof requirements.

You may like:

Sino-Inst offers over 20 Liquid Level gauges for level measurement. About 50% of these are fuel level meters, 40% is the tank level sensor.

A wide variety of Liquid Level gauges for level measurement options are available to you, such as free samples, paid samples.

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

KimGuo11

drurylandetheatre.com

Mass Flow Rate vs Volumetric Flow Rate

Posted on October 12, 2020 by KimGuo11

Mass flow rate and Volumetric flow rate is what we must use in flow measurement and control. So what is mass flow and what is volumetric flow? How to switch between them? In this post, we compare the concept of volume flow and mass flow and the conversion between the two.

Commonly used flow meters, such as orifice plates. Turbine flowmeter. Vortex flowmeter. Electromagnetic Flowmeter. Rotameter. The flow measurement value of ultrasonic flowmeter and oval gear flowmeter is the volume flow of fluid. Coriolis mass flow meters and thermal gas mass flow meters measure mass flow.

Sino-Inst offers a variety of volume flow and mass flow meters for flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote

More Flow Meters

What is Flow Rate?

Flow rate refers to the ratio of the amount of fluid flowing through the cross-section of the pipe to the time it takes for that amount to pass through the cross-section. Flow is divided into volume flow and mass flow.

What is volume flow Rate?

The volume flow rate is the flow rate expressed by the volume of the fluid quantity.
The volume flow is expressed by the formula: qv=V/t=u×A.

In the formula:

qv is the volume flow, m3/s.
V is the unit flow volume, m3.
t is the unit time, s.
u is the average flow velocity in the pipe, m/s.
A is the cross-sectional area of the pipeline, m2.

Among the commonly used flow meters, such as orifice plates, turbine flow meters, vortex flow meters, electromagnetic flowmeters, rotameters, ultrasonic flow meters, and oval gear flow meters, the flow measurement value is the volume flow of the fluid.

If you need, you can learn more about Flow Rate And Pressure Relationship.

Featured Volume Flow Meters

Volume flow unit converter

Unit	L/min	m3/h	f t 3/h	Ukgal/min	Usgal/min	US bbl/d
L/min	1	0.06	2.1189	0.21997	0.0264188	9.057
M3/h	16.667	1	35.314	3.667	4.403	151
Ft3/h	0.4719	0.028317	1	0.1038	0.1247	4.2746
Ukgal/min	4.564	0.02727	9.6325	1	1.20032	41.1
Usgal/min	3.785	0.2273	8.0208	0.8326	1	34.28
US bbl/d	0.1104	0.00624	0.23394	0.02428	0.02917	1

What is mass flow Rate?

Mass flow rate refers to the flow rate of fluid quantity expressed by mass.
The mass flow rate can be expressed by the formula: qm=m/t=ρ×u×A.

In the formula,:

qm is the mass flow rate, kg/s.
m is the unit fluid mass, kg.
ρ is the fluid density, kg/m3.
t is the unit time, s.
u is the average flow velocity in the pipe, m/s.
A is the cross-sectional area of the pipeline, m2.

Extended reading: Gas mass flow controller working principle

Featured Mass Flow Meters

**T-series Triangle Coriolis Mass Flowmeter**

**V-series Curved Digital Mass Flow Meter**

Volumetric Flow Rate Units

“Volumetric Flow Rate Units” and “Volume Flow Rate Units” are essentially identical—both refer to the units used to measure the volume of fluid per unit time. The only difference is that the former (using the adjective “volumetric”) is more commonly used in formal technical contexts, while the latter (using the noun “volume” directly) is more concise and conversational, and they are interchangeable in practical applications.

Volumetric (or volume) flow rate units combine volume and time metrics. Common examples include:

SI & Metric Units:
- m³/s (cubic meters per second, standard SI unit)
- m³/h (cubic meters per hour)
- L/s (liters per second), L/min (liters per minute)
- cm³/s (cubic centimeters per second, for small flows)
Imperial/US Units:
- GPM (gallons per minute; 1 imperial gal ≈ 4.546 L; 1 US gal ≈ 3.785 L)
- gal/h (gallons per hour)

Key Conversions

1 m³/s = 3600 m³/h = 1000 L/s = 60,000 L/min
1 m³/s ≈ 13,208 imperial GPM ≈ 15,850 US GPM

Notes

Ensure unit consistency with density (e.g., use m³/s with kg/m³ for mass flow calculations).
Distinguish imperial vs. US gallons to avoid errors.

mass flow rate units converter

1 kilogram per second (kg/s)

=3600.0000 kilograms per hour (kg/h)

=3.6000 tons per hour (t/h)

=86.4000 tons per day (t/d)

=2.8800×104 tons per year (t/a)

= 2.2046 pounds per second (lb/s)

= 7936.6414 pounds per hour (lb/h)

= 1.9048 x 105 pounds per day (lb/d)

Unit	(t/h)	(kg/h)	(kg/min)	(kg/s)	(UKton/h)	(lb/h)	(lb/min)	(lb/s)
(t/h)	1	103	16.6667	0.277778	0.984207	2204.62	36.7437	0.61239
(kg/h)	10^-3	1	0.0166667	2.77778×10^-4	9.84207×10^-4	2.20462	0.0367437	6.12395×10^-4
(kg/min)	0.06	60	1	0.0166667	0.0590524	132.277	2.20462	0.0367437
(kg/s)	3.6	3600	60	1	3.54315	7936.63	132.277	2.20462
(UKton/h)	1.01605	1016.05	16.9342	0.282236	1	2240	37.3333	0.62222
(lb/h)	4.53592×10^-4	0.453592	0.00755987	1.25998×10^-4	4.46429×10^-4	1	0.0166667	2.77778×10^-4
(lb/min)	0.0272155	27.2155	0.453592	0.00755987	0.0267857	60	1	0.016666
(lb/s)	1.63293	1632.93	27.2155	0.453592	1.60714	3600	60	1

Volumetric flow rate to Mass flow rate

The mass flow rate and volume flow rate relationship can be briefly summarized as follows:

If the mass flow of the flow is known and needs to be converted into volume flow, the following formula can be used: qv=qm/ρ. In the formula, qv is volume flow, m3/s. qm is mass flow, kg/s. ρ is fluid Density, kg/m3.
If the volume flow rate of the fluid is known, it needs to be converted into a mass flow rate, which can be done with the formula: qm=qv×ρ.

volumetric flow rate to mass flow rate calculator

Mass Flow & Density to Volume Flow Calculator	Mass Flow Rate Unit Converter	Volume Flow Rate Converter
Volume Flow & Density to Mass Flow Calculator	Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

How to convert air volume flow to air mass flow?

The conversion factor between air volume flow rate and air volume flow rate is 1.29. That is, to convert the volume flow of air into the mass flow, multiply the coefficient by 1.29.

Solution: Let the mass of air passing in t hours be m kg, the volume be V cubic meters, and the known air density ρ = 1.29 kg/m3.

Then the volume flow rate of the air qv=V/t (cubic meters/hour), and the mass flow rate qm=m/t (kg/hour).

And because air quality = air density x air volume, m = ρV = 1.29V.

Then qm=m/t=ρV/t=ρqv=1.29qv.

That is, to convert the volume flow of air into a mass flow, multiply the coefficient by 1.29.

Converter Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Density, Mass Flow, and Volumetric Flow Relationship

A description of the relationship between density, mass flow rate, and volumetric flow rate. The following video provides a good explanation.

Video source: https://www.youtube.com/watch?v=4KNfADc77XU

Frequently
Asked
Questions

Help Center

If the volume flow rate of the fluid is known, it needs to be converted into mass flow rate, which can be carried out by the formula: qm=qv×ρ

Volume flowrate (Volume Flowrate) is the volume of fluid passing through the flow section per unit time, referred to as flow rate, expressed by Q.
Flow rate expressed in volume/time or volume/time. Such as: m³/h ,l/h.
Volume flow rate (Q) = average velocity (v) * pipe cross-sectional area (A)

The fluid pressure and flow rate in the pipeline are completely two concepts. For fluids with high pressure, the flow rate can be high or low.
Engineering pressure is the amount of force per unit area. The flow rate is the amount (weight or volume) of the fluid flowing through the pipe per unit time.
Here, there is another important parameter: flow rate. It is the average velocity of fluid flowing in the pipe. The unit is: the flow rate per unit area (internal section of the pipeline). That is: the flow rate multiplied by the pipe cross-sectional area equals the flow rate.
If the fluid is a gas (compressibility), the flow rate is constant, and the flow rate of a gas with high pressure is of course also large. If the size of the pipe is constant, the flow rate of the fluid with a large flow rate is of course also large; the pressure loss (i.e. pipeline resistance) is proportional to the square of the flow rate, that is, proportional to the square of the flow rate.

If the fluid under a certain pressure is directly discharged to the atmosphere under certain conditions (the diameter of the pipe is the same), the fluid pressure can be converted into velocity energy, and the flow rate of the fluid with high pressure is correspondingly high, and of course, the flow rate is also large.

Intrinsically Safe vs Explosion Proof Pressure Transmitters

Posted on October 10, 2020 by KimGuo11

Intrinsically safe vs explosion proof is a common function of pressure transmitters. When pressure transmitters need to be used in high-risk and explosive places, you must know it!

The explosion-proof pressure transmitter is divided into: intrinsically safe pressure transmitter (explosion-proof mark Exia ⅡC T6 Ga), explosion-proof pressure transmitter (explosion-proof mark Exd ⅡC T6 Gb). Intrinsically safe pressure transmitters must be used with safety barriers. The connection terminals of explosion-proof pressure transmitters must have an explosion-proof electrical connector box and a solid shell.

Sino-Inst offers a variety of explosion-proof pressure transmitters. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Sensors

Intrinsically Safe vs Explosion Proof

It is often necessary to use explosion-proof instruments in industrial sites. The general industrial explosion-proof instruments are mainly explosion-proof and intrinsically safe. So, how to understand the difference between them?

Different from the design concept:

Flameproof definition:

It can withstand the explosive pressure of internal explosive gas mixture. And can prevent the internal explosion from spreading to the explosive mixture around the enclosure of electrical equipment enclosure (zone I explosion-proof technology).

Dangerous gases are allowed to enter the flameproof enclosure, which may cause an explosion. However, the enclosure must have sufficient strength. And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap. To ensure that the internal explosion will not pass through the flameproof joint and cause the external environment to explode.

Clearance explosion-proof technology. Rely on the gap and mesh length to achieve the effect of cooling and flameout.

Definition of intrinsic safety:

Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuits in the specified explosive gas environment (Zone 0/I explosion-proof technology).

It is a “safe” technology that uses suppression of ignition source energy as an explosion-proof method. It is required that the electric spark or thermal effect that the equipment may produce under normal operation or failure state are respectively less than the minimum ignition energy and self-ignition temperature of the explosive dangerous gas. For example: hydrogen 19uJ 560℃.

Intrinsically safe technology is actually a low-power design technology. Therefore, it can be well applied to industrial automation instruments.

Different from the application area

Explosion-proof applicable area: It can only be installed in hazardous locations in Zone 1 or Zone 2.

Intrinsically safe application area:

Exia: Equipment that can maintain explosion-proof performance until two components or other types of failures. Intrinsically safe equipment can be installed in hazardous locations in Zone 0, Zone 1, and Zone 2. Exia intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in zone 0.

Exib: Equipment that can maintain explosion-proof performance until a component or other type of failure. Intrinsically safe equipment can be installed in hazardous locations in Zone 1 and Zone 2.

Explosion Proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.

All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

The application range of explosion-proof pressure transmitter is as follows:

Natural gas control system natural gas compressor dispenser;
Oil well platform wellhead pressure equipment blowout preventer pipeline equipment mine;
Storage and transportation monitoring of oil tanks and oil products, petrochemical equipment, oil refining;
Oxygen transmission system and pipeline, hydrogen equipment;
Power stations, boilers, thermal power units, etc.;
Petrochemical environmental protection air compressor light industry machinery metallurgy;
Other pressure measurement environments with explosion-proof requirements.

Of course, intrinsic safety and explosion-proof are not limited to pressure transmitters. Other industrial instruments have this function. To ensure the use of users in dangerous and harsh environments.

More Featured intrinsic safety and explosion-proof sensors

**Hygienic / Sanitary Pressure Transmitter**
Also called Hygienic pressure Transmitters, or tri clamp pressure transmitter. Sanitary pressure Transmitters is used to food &beverage or pharmaceutical application.

**High-Temperature Pressure Transmitter**
**High-temperature pressure transmitters** with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.

**Absolute Pressure Transmitter**
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.

**Hydrostatic pressure transmitter**
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .

LT series Digital Display Magnetostrictive liquid level sensor

LP series Magnetostrictive Tank Level Indicator-PVDF/ PPH/ PTFE/ PFA/ PP

Sino-Inst offers a variety of Intrinsically Safe vs Explosion Proof Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

KimGuo11

drurylandetheatre.com

How to Calibrate a Pressure Transmitter

Posted on October 9, 2020 by KimGuo11

What is Calibrate a Pressure Transmitter?

Calibrate a Pressure Transmitter is an important step to help pressure transmitters make accurate measurements. Only when the input and output are debugged together can it be called a true calibration. Including the pressure of the input transmitter, A/D conversion circuit, and loop current output circuit.

Pressure transmitter calibration is what you need to do before you install the pressure transmitters.

Technical Support Pressure Sensors

Pressure Sensor Calibration Case Share. The customer purchased a batch of high-frequency dynamic pressure sensors from our company. According to customer requirements, the accuracy of our pressure sensor is ±0.25% FS.

After the pressure sensor was produced, it was delivered to a third-party inspection company. The accuracy of the high-frequency dynamic pressure sensor was verified. As a result of the verification, the accuracy of our high-frequency dynamic pressure sensors has reached ±0.20% FS, and a calibration certificate is attached.

About High-Frequency Dynamic Pressure Sensor

The customer purchased our SI-90 high-frequency dynamic pressure sensor.

SI-90 High-Frequency Dynamic Pressure Sensor

The use of micro-machining technology makes the effective size of integrated silicon chips small, high natural frequency, and excellent elastic properties. Comprehensive performance is better than piezoelectric dynamic pressure sensors. It is the first choice for dynamic pressure measurement.

Measuring range	-100KPa~0~1KPa…20KPa…100MPa
Overload capacity	2 times full scale pressure (where the overpressure of 100MPa product is 1.1 times full scale pressure)
Type of pressure	Gauge pressure or absolute pressure
Measuring medium	Gas or liquid compatible with 316 stainless steel
Comprehensive accuracy	±0.1 %FS	±0.25%FS		±0.4%FS
Natural frequency	150KHz~700KHz	500KHz~1MHz		1MHz~2MHz
Transmitter bandwidth	0~1KHz~3KHz	0~20KHz		0~200KHz
Rise Time	0~0.2mS~75μS	0~12μS		0~1μS
Long-term stability	Typical: ±0.1%FS/year		Maximum: ±0.2%FS/year
Operating temperature	Generally -40℃~85℃		Special can be -10℃~250℃
Zero temperature drift	Typical: ±0.02%FS/℃		Maximum: ±0.05%FS/℃
Sensitivity temperature drift	Typical: ±0.02%FS/℃		Maximum: ±0.05%FS/℃
Power supply range	12~36VDC (generally 24VDC)		±15VDC standard switching power supply
Signal output	4~20mA / 1~5 V DC / 0~5V DC
Load Resistance	≤(U-10)/0.02Ω
Shell protection	The cable is IP67 and the connector connection is IP65
Vibration error	≤±0.01%FS (X, Y, Z axis, 200Hz/g)
Interface and shell	Stainless steel 1Cr18Ni9Ti
O-ring	fluororubber
Sensor diaphragm	Stainless steel 316L

Guess You’ll Like: Explosion Proof Pressure Transmitter

Pressure Transmitter Calibration Equipment

According to the description in “JJG882-2004 Pressure Transmitter Verification Regulations”. A pressure transmitter is an instrument that converts a pressure variable into a standardized output signal that can be transmitted. And there is a given value between its output signal and the pressure variable Continuous function relationship (usually linear function). Mainly used for the measurement and control of industrial engineering pressure parameters. Differential pressure transmitters are often used for flow measurement.

There are two types of pressure transmitters: electric and pneumatic. The standardized output signals of electric motors are mainly 0mA~10mA and 4mA~20mA (or 1V~5V) DC signals.

illustrate:

The two-wire pressure transmitter is a kind of electric type. Calibration should be carried out according to “JJG882-2004 Pressure Transmitter Verification Regulations”. The required equipment is as follows:

One DC 24V power supply;
One mA ammeter;
One voltmeter;
One standard pressure gauge;
One pressure source;
One piston pressure gauge (4 and 5 are optional when this option is available).

At present, the digital pressure calibrator integrates various functions such as DC24V, voltage measurement, current measurement, on-off measurement, etc. The equipment is constantly developing towards intelligence and miniaturization.

For example, you only need to configure the ConST273 intelligent digital pressure calibrator and the ConST100 series pressure pump. You can complete the HART intelligent pressure transmitter, ordinary pressure transmitter, precision pressure gauge, general pressure gauge, pressure controller, and other pressure instruments. Verification work.

Read more about: What Are 0-10V Pressure Transducers?

Pressure Sensor Calibration Certificate

Extended reading: Static pressure vs dynamic pressure vs total pressure

About the Third-Party Testing Company

The qualifications of the testing company are as follows:

More Featured Pressure sensors:

**SI-520 Digital Pressure Sensor**
Digital Pressure Sensor is particularly suitable for use in computer control systems. RS485 half-duplex working mode.

**SI-302 OEM pressure sensor**
OEM pressure sensors from Chinese manufacturer. Silicone filled. Protected by stainless steel diaphragm. Suitable for a variety of fluid media.

**SI-703 Flush diaphragm pressure sensor**
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.

**SI-10 Liquid pressure sensor**
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.

How Do You Calibrate a Smart Pressure Transmitter?

Pressure Transmitter Calibration

Related blogs：

What does intrinsically safe mean?
Intrinsically safe type is an explosion-proof type of electrical equipment. When purchasing electrical equipment, do you often hear…
4-20 mA to 0-10 V Converter: Resistor Table, Wiring & PLC Scaling
A 4-20 mA current loop carries a sensor signal across hundreds of meters with near-zero drift. A 0-10…
What Does SCADA Stand For? Supervisory Control And Data Acquisition Explained
SCADA stands for Supervisory Control And Data Acquisition. It is the software-and-hardware stack that lets one operator watch…
PID Controller: Working Principle, Ziegler-Nichols Tuning & Applications
A PID controller takes the difference between where a process is and where you want it to be…
Static Pressure vs Dynamic Pressure (vs Total): HVAC & Pitot
Static, dynamic, and total pressure are three flavours of the same scalar — but they appear at different…
What Is an Air Pressure Transducer?
An Air pressure transducer is a sensor that converts the mechanical signal of air pressure into a current…
Steam Pressure Transmitter
Steam pressure transmitters are widely used in the measurement and control of various high-temperature steam piping systems. The…
Cryogenic pressure transducer for liquid nitrogen/oxygen/hydrogen
Cryogenic pressure transducer for low temperature pressure measurement. -196℃～+125℃, -260℃/-350℃ (special models). Sino-Inst offers a variety of low…
High Frequency Dynamic Pressure Sensor
Dynamic pressure sensor, the transmitter is a high frequency sensor. Sino-Inst offers a variety of Dynamic Pressure Sensors…
Intrinsically Safe vs Explosion Proof Pressure Transmitters
Intrinsically safe vs explosion proof is a common function of pressure transmitters. When pressure transmitters need to be…
DP Transmitter Installation: Hook-Up, Impulse Lines & Zero
A differential pressure transmitter (DPT) measures the pressure drop across two points — across an orifice for flow,…

Sino-Inst offers over 20 Pressure sensors. A wide variety of Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of Pressure sensors, located in China.

Of course, according to your requirements, we can also provide Pressure Sensor Calibration Case: Third-party Calibration Certificate.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

KimGuo11

drurylandetheatre.com

Steam Flow Measurement: Do you need temperature and pressure compensation?

Posted on October 8, 2020 by KimGuo11

Steam flow measurement has always been a problem. Today we solve a problem of temperature and pressure compensation. So Do you need temperature and pressure compensation for Steam Flow Measurement?

There are two types of steam, saturated steam and superheated steam.
The temperature and pressure compensation is superheated steam. For the real saturated steam, only temperature or pressure compensation is required. Check the density table according to the temperature and pressure during measurement to obtain the required mass flow.

Generally speaking, vortex flowmeter manufacturers will provide saturated and superheated steam mass flow range tables for users to select.

In the actual measurement, due to changes in working conditions, saturated steam and superheated steam are willing to deviate from the original design. It will change the relationship between steam temperature and pressure to obtain its density. Affect the accuracy of measurement.

Wet saturated steam

When the vortex flowmeter is installed behind the pressure reducing valve. The wet saturated steam suddenly decompresses greatly. The fluid undergoes adiabatic expansion. The water droplets partially evaporate. At the same time, the heat of vaporization is absorbed from the liquid and vapor phases. Reduce the vapor and liquid phase temperature.

If the temperature does not drop much or the humidity is high before evaporation, the temperature will quickly drop to the saturation temperature corresponding to the new pressure. Create a new balance. At this time, the steam is still saturated steam.

If the pressure drops a lot or the humidity is low before evaporation. After the temperature is lowered due to the evaporation of water droplets, it is still higher than the saturation temperature corresponding to the new pressure. The steam becomes superheated steam.

Superheated steam

In the flow calculator, the mass flow can be calculated according to the density of the superheated steam temperature and pressure. But when the superheated steam is transported over a long distance. Or due to improper pipe insulation measures. Often due to the decrease in heat loss temperature, it will enter the critical saturation state from the overheating state. Even part of the steam condenses and undergoes a phase change to become water droplets. At this time, it becomes wet saturated steam (supersaturated steam).

Featured Flow Meters for Steam Flow Measurement

**Welding Orifice Plate High temperature flow meter**

Vortex flow meter for Steam Flow Measurement

The output of the vortex flowmeter is only proportional to the flow rate of the fluid flowing through the measuring tube. When measuring the humidity of saturated steam, the influence of water droplets on the output of the vortex flowmeter is negligible. Therefore, it can be considered that the output of the vortex flowmeter is completely caused by the dry part (saturated part) of the wet and saturated steam. The density of the dry part can be accurately detected according to pressure compensation or temperature compensation.

When steam metering, if the two parties agree to settle the cost based on the dry part of the steam, there is no charge for condensate. The influence of the phase change on the measurement is negligible and can be ignored. If the condensate is also charged as steam. The measurement result of the vortex flowmeter is low.

After the above evaporation occurs, the former has no effect on compensation. Only the dry part in the steam increases, and the dryness increases accordingly.

In the latter case, the wet saturated steam becomes superheated steam. At this time, the impact on the flowmeter is divided into the following three situations:

The design has taken into account that the steam becomes superheated. Or in what state is difficult to determine. Or sometimes it is overheated and sometimes it is saturated. So use temperature and pressure compensation. Then the above-mentioned phase change has no influence on the measurement result.
Consider saturated steam when designing, and adopt pressure compensation. Then the above-mentioned phase change will bring a smaller error. That is, the compensation error caused by the density difference corresponding to the difference between the superheated steam temperature and the saturated steam temperature.
Consider saturated steam when designing. But use temperature compensation. That is, the superheated steam temperature is regarded as the saturation temperature to check the density table. Generally, large errors will be caused.

There are three ways to solve the above problems:

Install the total steam flow meter before the pressure reducing valve. Because the above steam is not decompressed. There is no phase change problem. So install the flowmeter before the pressure reducing valve. According to the saturated steam compensation method. The measurement accuracy can be guaranteed.
If the flow meter can only be installed behind the pressure reducing valve. A pressure transmitter can be added for temperature and pressure compensation.
If the stability of the pressure reducing valve is better. The upstream pressure value of the flowmeter can be set as a constant value into the display instrument for temperature and pressure compensation.

Sino-Inst, Manufacuturer for Steam Flow Measurement Flowmeters.

Sino-Inst’s Steam Flow Measurement Flowmeters, made in China, Having good Quality, With better price. Our Steam Flow Measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

drurylandetheatre.com

1.Float level sensor, Float level switch and Float level controller Structure difference

2.Float level sensor, Float level switch and Float level controller Price difference

3.Float level sensor, Float level switch and Float level controller Functional difference

Featured Float level sensor, Float level switch and Float level controller

What is float level switch?

What is a normally open float switch?

How do float level sensors work?

Float level switch working principle

Featured Non Contact Liquid Level Sensors

Non-Contact Level Measurement

Methods of liquid level measurement:

Applications of Non Contact Liquid Level Sensors

Non Contact Liquid Level Sensor Working Principle

Ultrasonic Level Sensor Working Principle

Radar Level Measurement: Measuring Principle

Procurement Guide: Ultrasonic Non Contact liquid level sensors

CO2 Cylinder | Portable Non Contact Liquid Level Gauge

Non Contact Liquid Level Switch and Controller

Frequently Asked Questions

How does non contact liquid level sensor work?

What is non contact level sensor?

What sensor measures liquid levels?

How does a liquid level sensor work?

Related Liquid Level Measurement Solutions

Featured Ultrasonic liquid level sensors

What is ultrasonic level sensor?

How does ultrasonic level measurement work?

What is a liquid level sensor?

Ultrasonic liquid level sensors vs Radar level sensors

Ultrasonic Level Sensor and Transmitter

Ultrasonic Level Sensor 4-20mA

Ultrasonic Level Sensor for Solids

Non Invasive Level Measurement

Non Intrusive Level Gauge

More Non Contact Liquid Level Sensors

Frequently Asked Questions

What is ultrasonic liquid level detector?

What is ultrasonic liquid level sensor?

How does ultrasonic water level sensor work?

Can ultrasonic sensor detect liquid?

Related Blogs

Contents

What Is a CO2 Cylinder Portable Liquid Level Gauge?

Why Can’t You Use Pressure to Check a CO2 Cylinder?

How Does a Portable Ultrasonic Level Gauge Work?

How to Check a CO2 Cylinder Level Step by Step

How to Choose a Portable CO2 Level Gauge

Where Portable Cylinder Gauges Are Used

Common Mistakes When Checking Cylinder Level

Portable Level Gauges from Sino-Inst

FAQ

How do you check the level of a CO2 cylinder?

Why can’t I use the pressure gauge to check CO2 level?

How accurate is ultrasonic cylinder level testing?

What couplant should I use for ultrasonic cylinder testing?

Is ultrasonic testing an approved alternative to weighing cylinders?

Can one portable gauge check different cylinder sizes?

How do I choose and source the right portable level gauge?

About This Article

Features of High Frequency Dynamic Pressure Sensor

Specifications of High Frequency Dynamic Pressure Sensor

Applications of High Frequency Dynamic Pressure Sensor

More Featured Pressure Sensors

More Solutions for pressure measurement

Liquid Chlorine Storage Tanks chemical properties

Level gauges types used for tank level measurement

Application of different level gauges in Liquid Chlorine Storage Tanks

1.Application of radioactive level gauge in Liquid Chlorine Storage Tanks

2.Application of top-mounted float level gauge in Liquid Chlorine Storage Tanks

3.Application of capacitive level gauge in Liquid Chlorine Storage Tanks

4.Application of side-mounted magnetic flap level gauge in liquid chlorine storage tanks

5.The application of external level gauge in Liquid Chlorine Storage Tanks

Featured external level gauges in Liquid Chlorine Storage Tanks

What is Flow Rate?

What is volume flow Rate?

Featured Volume Flow Meters

Volume flow unit converter

What is mass flow Rate?

Featured Mass Flow Meters

Volumetric Flow Rate Units

Frequently
Asked
Questions

Frequently
Asked
Questions

Frequently
Asked
Questions