Cryogenic Flow Meters for Highly Accurate and Reliable Cryogenic Fluids Flow Measurement.

Cryogenic Flow Meters for Sale

Commonly used Cryogenic Flow Meters include cryogenic turbine flow meters, orifice flow meters, mass flow meters, target flow meters, etc. Representative cryogenic fluids include LNG (liquefied natural gas), LN2 (liquid nitrogen), LO2 (liquid oxygen), liquefied ethylene, liquid hydrogen, liquid chlorine, and these cryogenic gases. LPG (liquefied petroleum gas) is not included in the cryogenic Fluid.

Sino-Inst offers a variety of  Cryogenic Flow Meters for Cryogenic fluids flow measurement. If you have any questions, please contact our sales engineers.

A cryogenic flow meter refers to an industrial flow meter specifically used to measure extremely low-temperature media. A cryogenic flow meter can complete the flow measurement of the medium under extremely low-temperature conditions. And the measurement accuracy is good, and will not damage the flowmeter.

At present, the common industrial cryogenic medium is around -200℃. For example, liquid nitrogen, liquid oxygen.

Extended reading: Cryogenic Liquid Nitrogen Flowmeters

A cryogenic liquid is defined as a liquid with a boiling point below -130oF (-90℃).

The representative cryogenic fluids are LNG (liquefied natural gas), LN2 (liquid nitrogen), LO2 (liquid oxygen), liquefied ethylene, liquid hydrogen, liquid chlorine and these cryogenic gases. LPG (liquefied petroleum gas) is not included in the extremely low temperature fluid.

Learn more about: Handling Cryogenic Liquids

Featured Cryogenic Flow Meters

Cryogenic Turbine Flow Meter

The liquid nitrogen flow meter is a commonly used cryogenic flow meter. The low-temperature turbine flowmeter is a dedicated liquid nitrogen flowmeter. It can also be used to measure cryogenic liquids such as liquid oxygen.

Low temperature Turbine Flowmeter-The Best Liquid Nitrogen Flow Meter

Liquid nitrogen refers to liquid nitrogen. Liquid with extremely low temperature. In industrial production, liquid nitrogen can be used as a deep refrigerant. The low-temperature turbine flowmeter is used as a liquid nitrogen flowmeter, which can work at a low temperature of -196°C (-320.8 °F). Liquid Nitrogen Flow Meter’s Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material, and it is equipped with low-temperature resistant amplifier. Realize the instantaneous and cumulative flow monitoring of liquid nitrogen.

Know more about: Turbine type Flow Meter

Cryogenic Mass Flow Meter

Cryogenic Mass Flow Meter

Cryogenic Mass Flow Meter is developed for measuring cryogenic media such as liquefied natural gas. The flow meter consists of a mass flow sensor and a transmitter. Adopting high-efficiency heat insulation technology to effectively control the heat exchange between LNG and other low-temperature media when flowing through the sensor. Reduce the vaporization of LNG and other low-temperature media in the pipeline, thereby reducing the impact of vaporization on flow measurement.

The equipped transmitter uses a digital signal processor (DSP) to process the collected signals and has the ability to judge the real-time state of the medium and other intelligent self-diagnosis functions. Temperature measurement range: -200-350℃.

Extended reading: Liquid Mass Flow Meter

Orifice flowmeter for cryogenic fluid

At present, many flows measuring instruments for extremely low-temperature fluids are orifice flowmeters, and their reliability is also very high.

Orifice flowmeter for cryogenic fluid
  1. The material is 316L;
  2. In order to prevent fluid leakage caused by cold shrinkage. It is recommended to use welding method to connect, the orifice plate and the pipe use the same material;
  3. The porous orifice plate has advantages in the flow measurement of very low temperature fluids such as liquefied natural gas. Because the gas that may be generated can flow smoothly downstream from the small holes on the upper part of the orifice plate, and no gas accumulates in front of the orifice plate.

Extended reading: Fluid flow meter types

Target flowmeter for cryogenic fluid

Target Flow Meter

The target flow meter also called a drag force flowmeter. The target flow meter inserts a target (drag element) into the flow field. The target usually is a flat disc or a sphere with an extension rod. There will be a differential pressure. And then target flow meters measure the drag force on the inserted target and convert it to the flow rate. Sino-Inst manufactures target flow meters for liquid, gas, and steam measurement.

It can accurately measure the flow of gas and liquid under various working conditions of normal temperature, high temperature 500℃, and low temperature -200℃;

Read more about Nitrogen Gas Flowmeters-Liquid Nitrogen Flowmeters

How does a cryogenic flow meter work?

Different cryogenic flow meters have different working principles. Here we choose the commonly used target type flowmeter to introduce the working principle.

When the medium flows in the measuring tube, the pressure difference caused by its own kinetic energy passing through the blocking member (target). And has a force on the blocking member. The magnitude of the force is proportional to the square of the velocity of the medium.

The mathematical way is as follows:
F = CdAρ • V2 / 2

In the formula: F —— the force of the choke (kg)
Cd-object resistance coefficient
A ——Axial projection area of ​​the choke on the measuring tube (mm2)
ρ ——Density of medium under working conditions (kg / m3)
the v-average flow velocity of the medium in the measuring tube (m / s)
The force F received by the choke member (target) is transmitted to the capacitive force sensor via a rigidly connected transmission member (stem).

And the capacitive force sensor generates a voltage signal output:
V = KF
In the formula:
V——Voltage output by the capacitive force sensor (mV), K——Proportional constant, F——The acting force of the choke (target)
So, after the voltage signal is pre-amplified, AD converted. And processed by the computer. The corresponding instantaneous flow and the cumulative total can be obtained.

Liquid Nitrogen-Liquid Oxygen-Liquid Co2 Flow Meter

Liquid nitrogen refers to liquid nitrogen.
Liquid nitrogen is an inert, colorless, odorless, non-corrosive, non-flammable, extremely low-temperature liquid.

Frostbite is caused by a large amount of endothermic contact during vaporization.

Nitrogen makes up the bulk of the atmosphere (78.03% by volume and 75.5% by weight).

At normal pressure, the boiling point of nitrogen is -196.56°C. 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen (21°C). Liquid nitrogen can be obtained at higher temperatures if pressurized.

In industry, liquid nitrogen is obtained by fractional distillation of air.
The air is first purified and then liquefied in a pressurized and cooled environment. Separation by the different boiling points of components in the air.

There is no problem when human skin directly contacts liquid nitrogen for an instant. More than 2 seconds will cause frostbite and irreversible.

Extended reading: V-Cone Flow Meter Working Principle

Liquid oxygen (commonly denoted by the abbreviation LOX or LO²) is the form of oxygen in its liquid state. It has important applications in aerospace, submarine and gas industries. Liquid oxygen is a light blue liquid with strong paramagnetic properties.

Liquid O2 has a wide range of industrial and medical uses. Liquid oxygen is produced industrially by fractional distillation of liquid air. The total expansion ratio of liquid oxygen is as high as 860:1. Because of this advantage it is widely used in industrial production and military in modern times.

Due to its low temperature properties, liquid oxygen can make the substances it comes into contact with very brittle.

Liquid oxygen is also a very strong oxidant: organic matter burns violently in liquid oxygen. Some substances may explode if immersed in liquid oxygen for extended periods of time, including asphalt.

Liquid carbon dioxide refers to the liquefaction of carbon dioxide gas into a liquid form under high pressure and low temperature.

Liquid carbon dioxide is a refrigerant. It can be used to preserve food, and it can also be used for artificial rainfall.

It is also an industrial raw material and can be used to make soda ash, urea and soft drinks.

For the above liquid nitrogen, liquid oxygen, liquid hydrogen and other extremely low temperature liquids, if you need to detect the flow. Then we recommend choosing a very low temperature turbine flowmeter or a gear flowmeter. These two flowmeters can perform excellent flow detection under extremely low temperature conditions.

Low temperature Turbine Flowmeter-The Best Liquid Nitrogen Flow Meter

The low-temperature turbine flowmeter is used as a liquid nitrogen flowmeter, which can work at a low temperature of -196°C (-320.8 °F). The Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material. Realize the instantaneous and cumulative flow monitoring of liquid nitrogen.

  1. Nominal diameter:
    Common type (0.5~300) mm;
    Anti-corrosion type (6~100) mm
    Insertion type (80~600)mm
  2. Medium temperature:
    Ordinary type (-20~80)℃
    High temperature type (-20~120)℃
    Ultra-low temperature type (-196~80)℃
  3. Ambient temperature: (-20~55)℃;
  4. Accuracy: ±0.2%, ±0.5%, ±1%;
  5. Detector signal transmission line system: three-wire voltage pulse (three-core shielded cable);
  6. Power supply: voltage: 12V±0.144V, current: ≤10mA;
  7. Output voltage amplitude: high level ≥ 8V, low level ≤ 0.8V;
Gear flow transmitter

Gear flow meters are also a good choice for small-caliber liquid nitrogen measurement.

Gear flow transmitter is a type of positive displacement flow transmitter. It is a high-precision transmitter for measuring volume flow.

  • High pressure resistance (1.0-45MPa)
  • High and low temperature resistance (-196℃-200℃)
  • Can measure various viscous media
  • High precision and repeatability
  • Pulse output/analog output optional
  • Wide range ratio (1:100)
  • Wide measuring range
  • Strong anti-corrosion and anti-fouling ability (acid and alkali)


Turbine flow meters are velocity flow meters, also called impeller flow meters. Can be used to measure the instantaneous flow and cumulative flow of liquids and gases.


Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS and other computer control systems.

The purpose of the flowmeter is to measure the flow of fluid in a pipe or open channel.

Flow meters are the eyes of industrial production.

Flow meters play a big role. It not only monitors media flow in real time. Moreover, in this aspect of automation, many industrialized enterprises have greatly reduced a lot of manpower and material resources.

Some common types of flowmeters that mainly measure gases and liquids are:
Electromagnetic Flowmeter,
Vortex flowmeter,
Thermal mass flow meters,
orifice flowmeter,
Turbine flowmeter,
V cone flowmeter,
orifice flowmeter,
Porous balance flowmeter,
Metal rotameter, etc.

In my country, the absolute value of the maximum relative percentage error of the flowmeter is used as the standard for dividing the accuracy level.
The maximum relative percent error is a simplified relative error.
The calculation method is:
Relative percent error = (measured value of the measured parameter – standard value of the measured parameter) / (the upper limit of the scale – the lower limit of the scale) * 100%
In order to facilitate the transmission of the value, the country has uniformly stipulated the series of accuracy grades of the instrument.

Remove the “±” and “%” numbers from the relative percent error of the flowmeter. It can be incorporated into the national unified instrument accuracy grade series:

  1. The accuracy of the first-class standard flowmeter: 0.005, 0.02, 0.05;
  2. The flowmeter accuracy of the secondary standard: 0.1, 0.2, 0.35, 0.5;
  3. Accuracy of general industrial flowmeter: 1.0, 1.5, 2.5, 4.0.

In addition, according to different uses. The accuracy of the flowmeter can also be divided into different grades:

  1. The accuracy level of the flowmeter used in scientific experiments is above 0.05;
  2. Most of the instruments used for industrial testing are in grades 0.1 to 4.0. Among them, the standard meters used for calibration are mostly grade 0.1 or 0.2. Most of the instruments used on site are grade 0.5 to 4.0.
  3. The instruments used for industrial testing are mostly in the 0.1 to 4.0 level.

Coriolis mass flow meters should be the most accurate flow meters on the market today.
Of course, the user only needs to choose the precision that meets the needs.

Industrial CO2 flow meters Solutions

CO2 flow meters are instruments that can measure the flow of gaseous or liquid carbon dioxide. CO2 is a common industrial gas, and effective measurement is very important.

Carbon dioxide (CO2) is a colorless, odorless gas at room temperature and pressure. We often recommend precession vortex flowmeters, v-cone flowmeters, vortex flowmeters, gas turbine flowmeters, etc. Under different working conditions, we will choose different flow meters for customers.

Read more about: Industrial CO2 flow meters

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Sino-Inst, Manufacturer for Cryogenic Flow Meters. A wide variety of Cryogenic Flow Meters options are available to you. 

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

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