A 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.

Features of Turbine type Liquid Nitrogen Flow Meter

1. The sensor is a fully enclosed structure, so it is safe and reliable, and can be used for high-pressure pipeline measurement according to requirements;
2. The sensor material can be customized according to requirements, such as 304, 316 and all tetrafluoroethylene materials, suitable for various media, such as acid, alkali and other strong corrosive liquids;
3. The sensor is a hard alloy bearing thrust type, which not only ensures accuracy, but also improves wear resistance.
4. The sensor has been specially modified by our company, the structure is simple, firm and easy to disassemble;
5. Wide measuring range and low lower limit flow rate;
6. Measurement accuracy 0.2, 0.5, 1.0 can be selected as required;
7. Our company’s caliber breaks through the convention, from 0.5mm, 1mm, 2mm, etc. to super large diameter insert type can be customized;
8. When the anticorrosive PTFE material is constructed, the PTFE materials are all imported from Japan, which is safe and reliable;
9. Ultra-high pressure type sensor adopts high thickness sealed sensor, matching high pressure flange or installation accessories;
10. At ultra-low temperature (-196℃), the sensor structure is made of special custom-made imported materials, supporting low temperature resistant amplifier;
11. The comprehensive pressure loss is small, the repeatability is good, and the accuracy is high.
12. It has high resistance to electromagnetic interference and vibration.
13. Various displays, battery-powered on-site display, external power supply display, and various signal outputs are all configured;
14. The supporting explosion-proof meter is suitable for the use of explosion-proof products;
15. Various installation methods are available: thread, flange, quick installation, direct welding, etc.;
16. It can be used with flow totalizer to complete remote display;
17. It can be combined with control instruments and control systems to form automatic quantitative conveying and feeding equipment;

Know more about: Turbine type Flow Meter

Specifications of Turbine type Liquid Nitrogen Flow Meter

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;
8. Transmission distance: The distance between the sensor and the indicator can reach 250 meters;
9. On-site display power supply: 3V (powered by lithium battery, can be used continuously for 3 years);
10. Display mode: on-site LCD display instantaneous flow and accumulated flow;
11. On-site display power supply with signal output: 24V; 4-20mA two-wire current output, remote transmission distance of 500 meters.

Extended reading: Turbine Flow meter Vs Gear Flow meter

The flow range and pressure are shown in the figure, and the flow unit is m3/h (for anti-corrosion or plug-in type, please inquire)

Dn (mm)	Flow Range						Nominal pressure PN （Mpa）	Maximum pressure loss（Mpa）
	Basic error limit ±0.2%		Basic error limit 0.50%		Basic error limit 1.00%
	Lower limit	Upper limit	Lower limit	Upper limit	Lower limit	Upper limit
0.5					0.004	0.012	1.6 or 4	0.15
1					0.007	0.021
2*	–	–	–	–	0.01	0.13
3*	–	–	–	–	0.04	0.25		0.12
4*	–	–	–	–	0.04	0.25	4 6.3 16* 25* 35*（Note 1）
6			0.1	0.6	0.1	0.6		0.08
10			0.25	1.2	0.2	1.2
12	0.8	2.5	0.4	2.5	0.25	2.5
15	1.2	4	0.6	4	0.4	4
20	1.5	7	1.1	7	0.7	7
25	2	10	1.6	10	1	10		0.04
32	3.2	16	2.5	16	1.6	16
40	4	20	3	20	2.5	25	4 or 10
50	8	40	4	40	4	40
65	12	60	6	60	6	60	1.6 or 2.5
80	20	100	10	100	10	100
100	25	160	20	160	16	160
150	50	300	40	300	40	400
200	120	600	100	600	80	800	1.6 or 2.5 or 4
250*	200	1000	160	1000	120	1200
300*			250	1600	180	1800

Note 1: There is no 35MPa for diameter 32mm
Note 2: “*” is a special order.

The nominal diameter is 0.5mm, the flow range is 0.02～0.06 m³/h, the basic error: ±1% of reading, when ≤0.02 m³/h, the basic error: ±1%FS. The flow range with a nominal diameter of 1mm is 0.03～0.100 m³/h, the basic error: ±1% of reading, when ≤0.03 m³/h, the basic error: ±1%FS.

When the nominal diameter is 2mm and the flow range is 0.040~0.13m3/h, the basic error: ±1% of reading; when ≤0.040m3/h, the basic error: ±1%FS (full-scale value).

When the nominal diameter is 3mm and the flow range is 0.085~0.250m3/h, the basic error: ±1% of reading; ≤0.085m3/h basic error: ±1%FS (full-scale value).

The flow range shown in the table is a conventional value. If necessary, it can be appropriately extended according to user requirements. The minimum flow rate can be extended to about 0.3m/s, and some specifications can be lower. The accuracy in the extended area is based on the full-scale value. The relative error is expressed.

• Measuring medium: liquid (avoid multiphase flow)
• Medium viscosity range: ≤5mPɑ·S
• Calibration: Calibration with water before leaving the factory

Extended reading: Cryogenic Flow Meters | Liquid Nitrogen-Liquid Oxygen

Application of Liquid Nitrogen Flow Meter

• Quickly freeze and transport food, or make ice products;
• Conduct research on low temperature physics;
• In the electronics industry, dry nitrogen is used to purge silicon wafers to keep the silicon wafers dry and clean. In the large-scale integrated circuit production process, high-purity nitrogen can be used as the carrier gas, inert protective gas and packaging gas for chemical reaction gas.
• Liquid nitrogen is used for metal over-fitting or static-fitting assembly to avoid high temperature oxidation and maintain the surface finish of the parts. Parts soaked in liquid nitrogen can prolong the wear life after processing. Liquid nitrogen cooling during metal cutting has the advantages of long life and high surface finish.
• Nitrogen is mainly used as shielding gas and purge gas in metallurgical industry. In the process of steel rolling and metal heat treatment, due to the preservation of nitrogen, the high temperature oxidation of the metal is reduced and the surface is smooth and clean. Filling the non-ferrous metal smelting furnace with nitrogen can reduce oxygen content and temperature, reduce oxidation, and improve product purity. Purge the molten steel with nitrogen to reduce the hydrogen content in the steel and increase the strength of the product. When the blast furnace is started, 86% of nitrogen is blown in, which can reduce coke consumption and extend the service life.
• Used for chemical testing, such as BET specific surface area test method.

If you need to measure not liquefied nitrogen and liquefied oxygen, but gas nitrogen and oxygen. You can refer to:

Industrial oxygen flow meters Nitrogen flow measurement

Turbine type Liquid Nitrogen Flow Meter installation guide

1. Before installation and use, clean or keep the tested liquid free of impurities, fibers and particles.
2. Before using the sensor, fill the sensor slowly with liquid. Then open the outlet valve (the valve should be installed at the back of the flowmeter). It is strictly forbidden for the sensor to be impacted by high-speed fluid when it is in a liquid-free state.
3. Especially newly installed pipelines should be cleaned before installation. Install the sensor again.
4. The sensor should be cleaned regularly if possible. During maintenance and cleaning, please be careful not to damage the parts in the measuring chamber, especially the impeller. When assembling, please pay attention to the position relationship between the guide and the impeller.
5. When the sensor is not in use, clean the internal liquid. After drying, add protective sleeves on both ends of the sensor to prevent dirt from entering. Then store in a dry place. (This item is very important)
6. The equipped filter should be cleaned regularly. Clean the internal liquid when not in use. Just like the sensor, add a dust cover and store it in a dry place.
7. The transmission cable of the sensor can be laid overhead or buried (the iron pipe should be covered when buried.)
8. It is also very important to choose the installation point. It is recommended to install it on a horizontal pipe and pay attention to the direction of the fluid.
9. Ensure a certain straight pipeline before and after the installation point, away from pumps, frequency conversion or high-voltage equipment.
10. Before the sensor is installed, connect the line with the display instrument or the oscilloscope, turn on the power, and blow the impeller by mouth or hand to make it rotate quickly to observe whether there is display. Install the sensor when there is a display. If there is no display, check the relevant parts and troubleshoot.

Read more about Liquid Flow Meters Guide

Nitrogen Gas Flowmeters-Liquid Nitrogen Flowmeters

Gear flow meter for low liquid nitrogen flow measurement

The Gear flow meter is a micro digital positive displacement flow meter. Can measure very small flow rates and quantify small volumes of liquid. High and low-temperature resistance (-196℃-200℃).

The Gear flow meter for Microflow is made of stainless steel and is used for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, grease, and other high-viscosity media. It can measure the viscosity of Fluid up to 10000Pa.s.

Extended reading: liquid nitrogen level measurement

Nitrogen Gas flow meter

Cryogenic turbine flow meters and Gear flow meters are both used to measure cryogenic liquid nitrogen flow meters.
However, if you want to measure nitrogen, what flow meter should you use?

There are four mainstream measuring instruments:

1. Thermal gas mass flow meter. Directly measure the mass flow of common gases, including nitrogen.
2. Coriolis mass flowmeter. Directly measure the mass flow of gas and liquid. It can be used to measure nitrogen, which is more expensive.
3. The vortex flowmeter directly measures the volume flow of gas and liquid. It is necessary to add temperature and pressure measuring sensors and totalizers to calculate the mass flow.
4. Orifice flowmeter. The orifice is used as a throttling element and is equipped with a differential pressure transmitter to calculate the volume flow. To convert into a mass flow, temperature, pressure sensors and totalizers must also be added.

Compared with the above, the thermal gas mass flowmeter is recommended, which is moderately priced, simple to install and maintain, and accurate.

Further reading: Nitrogen(N2) Flow Meter Types

Extended reading: 5 matters to pay attention to when choosing threaded Vortex Nitrogen Gas Flow Meter

Other Featured Cryogenic Flow Measurement Solutions

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

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Sino-Inst, Manufacturer for Liquid Nitrogen Flow Meters. A wide variety of liquid nitrogen flowmeter options are available to you. 

Sino-Inst’s Liquid Nitrogen 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.

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.

Featured Turbine Flow Meters

Features of Turbine Flow Meters

1. High accuracy, good repeatability, low pressure loss, good vibration resistance;
2. Adopt high-quality bearings with low friction resistance. Good sealing and long life;
3. It integrates microprocessor, flow sensor, high-precision temperature and pressure sensor. Directly measure the flow, temperature and pressure of the gas/liquid being measured. And automatically perform flow tracking compensation and compression factor correction operations;
4. The meter has pulse signal and analog signal output. It can directly realize the centralized collection and real-time management of computer data through the RS485 communication interface or the GPRS system;
5. Low power consumption. It can be powered by internal battery or external power supply;
6. With real-time data storage function. It can prevent data loss when the battery is replaced or the power is suddenly lost. In the case of power failure, internal data can be stored permanently;
7. It can be used in conjunction with IC card prepayment system to facilitate trade settlement;

Turbine Flow Meter Working Principle

Gas turbine flow meter working principle

The gas turbine flowmeter uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate.

Gas turbine flowmeter is used to detect instantaneous flow and total integrated flow. Its output signal is frequency, which is easy to digitize.

The induction coil and the permanent magnet are fixed on the housing together. When the ferromagnetic turbine blade passes the magnet, the reluctance of the magnetic circuit changes, thereby generating an induction signal.

The signal is amplified and reshaped by the amplifier and sent to the counter or frequency meter. The total accumulated flow is displayed. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate instantaneous flow.

The speed of the impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal. It not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system.

The gas turbine flowmeter has a turndown ratio of up to 10:1, and the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 second.

Extended reading: Quantitative control with turbine flowmeter

Liquid Turbine Flow Meter Working Principle

Liquid Turbine Flow Meter is a speed type flow meter based on the principle of torque balance.

The fluid flows through the sensor housing. Because the blades of the impeller have a certain angle with the flow direction. The impulse of the fluid makes the blades have a rotational torque. After the friction torque and fluid resistance are overcome, the blades rotate. The speed is stable after the torque is balanced.

Under certain conditions, the speed is proportional to the flow rate.

Due to the magnetic permeability of the blade, it is in the magnetic field of the signal detector (composed of permanent magnets and coils). The rotating blade cuts the magnetic lines of force. The magnetic flux of the coil is periodically changed. Electrical pulse signals are induced at both ends of the coil.

This signal is amplified and reshaped by an amplifier. A continuous rectangular pulse wave with a certain amplitude is formed. It can be transmitted to the display instrument remotely. The instantaneous flow or total amount of the fluid is displayed.

Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor. The flow equation is:

Where:
f——Pulse frequency [Hz]
k——The meter coefficient of the sensor [1/m3], which is given by the calibration sheet.
Q——The instantaneous flow of fluid (under working condition) [m3/h]
3600-conversion factor in seconds

The meter coefficient of each sensor is filled in the verification certificate by the manufacturer. The k value is set in the matching display instrument. The instantaneous flow and cumulative total can be displayed.

Extended reading: Turbine Flow meter Vs Gear Flow meter

Turbine flow meter Advantages and Disadvantages

Turbine Meter Advantages

• The cost is moderate.
• Very good at clean, low viscosity fluids of moderate velocity and a steady rate.
• Turndown is very good as it can read very low compared to the greatest flow.
• They are reliable if put in a clean fluid especially if it has some lubricity.
• AGA and API approved for custody transfers.
• They do cause some pressure drop where that may be a factor such as gravity flows.
• High accuracy. Among all flowmeters, it is the most accurate flowmeter.
• No zero drift, good anti-interference ability.
• High accuracy. Among all flowmeters, it is the most accurate flowmeter.
• No zero drift, good anti-interference ability.

Extended reading: Featured Cheap flow meters for Sale

Turbine Meter Disadvantages

• Not reliable for steam.
• Bearings wear out.
• Requires constant backpressure to prevent cavitation.
• Accuracy adversely affected by bubbles in liquids.
• Turbine meters can be used with clean liquids and gases only (may need to install a strainer upstream to prevent damage from particulates).
• Not applicable for measuring corrosive fluids.
• May not function properly with high viscosity fluids where the flow profile is laminar.
• Cannot maintain calibration characteristics for a long time.

Read more Turbine Flow Meter Application Case: Demineralized Water.

Industries and Applications We Serve

Sino-Inst, Manufacuturer for Turbine Flow Meters, like: gas turbine flow meter, liquid turbine flow meter, sanitary turbine flow meter, insertion turbine flow meter, steam turbine flow meter, and natural gas turbine flow meter.

Sino-Inst’s Turbine 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.