What is nitrogen flow?

Nitrogen flow is common in the form of nitrogen gas and liquefied nitrogen. Nitrogen is often referred to as an inert gas. Used in some inert atmospheres for metal processing. And used in bulbs to prevent arcing. Nitrogen is commonly used for cleaning or pressurizing pipelines and storage containers, inerting flammable materials, disinfecting, covering tanks, and isolating oxygen-sensitive materials from the air. It is also used to reduce spoilage and discoloration in food. In liquid form, it is a common reagent for cooling, cooling, and freezing​​.

Therefore, it is very heavy to accurately measure the nitrogen flow.

 Flow Measurement of Nitrogen

Nitrogen flowmeters are important to different industries. Inline Flow Measurement of Nitrogen needs to purchase the correct flow meter.

Please follow the purchasing guide below. You will find your most suitable Nitrogen flowmeter!

First, let’s take a look at nitrogen.

Flow Measurement of Nitrogen

Nitrogen is required in many processes of the chemical and pharmaceutical industry; predominantly as protective gas, to prevent the occurrence of explosive atmospheres。

Such as when handling dusty products or solvents.

If your work requires you to use nitrogen, having a flow meter installed on your tank is a great way to save some money.

These indicators let you know whether gas is moving through the line, often via the use of a levitating ball, a pressure gauge, or other visual cue.

These options are simple to use and reliable, making them must-haves for welders, HVAC technicians, and more.

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Next comes the most important question:

Nitrogen(N2) flow meter types

There are 6 types of commonly used nitrogen flow meters:

If you need to measure the volume flow (m3/h, dum/s), it is best to use a vortex flowmeter. The accuracy is quite high and the price/performance ratio is good. However, when measuring with a vortex flowmeter, pay attention to the measuring range.

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 mass flow.

This is a new type of gas flow meter. The flowmeter integrates flow, temperature, and pressure detection functions. And can automatically compensate for temperature, pressure and compressibility. It is an ideal instrument for gas measurement in petroleum, chemical, electric power, metallurgy and other industries. It is also a common choice for nitrogen flowmeters.

For volume flow measurement, you can also use differential pressure flow meters, orifice flow meters, Verabar, and Annubar flow meters. However, the accuracy is lower and the price is higher. Its advantage is that it can measure the flow of gas-liquid two-phase media. For example, due to gas liquefaction or gas-liquid two-phase formation under high pressure.

Orifice plate flowmeter, orifice plate as a throttling element, equipped with a differential pressure transmitter. The volume flow can be calculated. To convert to mass flow, temperature and pressure sensors and totalizers must also be added.

If it is a mass flow measurement, a gas mass flow meter can be used. Thermal gas mass flow meter directly measures the mass flow of common gases, including nitrogen.

Direct measurement of the mass flow of gas and liquid can be used to measure nitrogen, which is more expensive.

Extended reading: Liquid Mass Flow Meter

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

The nitrogen flowmeter we designed is easy to use, reasonably priced, and fully functional. You can use our flow meters to measure compressed air, nitrogen, and industrial gases.

Of course, which type of nitrogen flowmeter to use. Please make further confirmation according to your actual needs.

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Featured Nitrogen Gas Flowmeters

Cryogenic Liquid Nitrogen Flowmeters

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 FlowMeter’s Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material, and it is equipped with a low-temperature resistant amplifier. 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.

With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. There is no need for a power supply. A pair of gears rotate freely. The cavity between the gears is filled with liquid. Discharge and measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument.

  • 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)

Case: vortex flowmeter used for nitrogen gas flow measurement

The vortex flowmeter works according to the Karman vortex principle. Each pulse or certain current signal output by the meter represents a certain volume of the measured medium. The total number of pulses output during a period of time or the integral of the analog current quantity will represent the sum of the flow of the medium flowing in this period. That is, the instantaneous flow and cumulative flow we often say.

The vortex flowmeter measures a wide range of media, and it can measure gas, liquid and steam. It has a high working temperature and can withstand 350 degrees high temperature. No moving parts, safe and reliable measurement, no wear. The watch body is made of stainless steel, which is corrosion resistant and has a long service life.

Today we are mainly talking about the vortex flowmeter used for the measurement of nitrogen flow.
Give an example to illustrate:

A user measures nitrogen. The pipe diameter is 100mm. The usual flow rate is 950m3/h. Temperature and pressure.
The temperature and pressure of the site working conditions are not high. The flow rate is also within the measurable range of the vortex flowmeter.
It is understood that the user’s installation site environment is also better without major vibration or interference. Therefore, the user uses a nitrogen flowmeter, that is, a vortex flowmeter. The specific parameters are as follows:

  • Measuring medium: nitrogen
  • Medium temperature: normal temperature
  • Working pressure: normal pressure
  • Flow range: 120-1200m3/h
  • Connection method: flange pipe type
  • Installation direction: horizontal installation
  • Body material: 304 stainless steel
  • Sensor material: 304 stainless steel
  • Resistance body material: 304 stainless steel
  • Display mode: on-site LCD display
  • Power supply mode: 24VDC
  • Pressure rating: 1.0MPa

Vortex flowmeter functions:

  1. On-site LCD displays instantaneous flow and cumulative flow;
  2. Output 4-20mA signal output;
  3. The secondary instrument display can be selected, and it can be used in conjunction with PLC, DCS and other computer control systems;
  4. With temperature and pressure compensation, the accuracy is better;
  5. Can be connected to RS485 communication protocol;
  6. Optional battery power supply and power supply power supply;
  7. There are multiple connection options such as pipe type, plug-in type, threaded connection, and clamp type.

Features of vortex flowmeter:

  1. The nitrogen flowmeter has no moving parts, no wear, dirt resistance, no mechanical maintenance, and long service life;
  2. The overall structure design of the instrument is reasonable, the dynamic measurement range is wide, and the pressure loss is small;
  3. The measurement is not affected by temperature and pressure and is resistant to high temperatures. High pressure.

Vortex flowmeter installation conditions:

  1. There is a straight pipe section at 15-20D. Downstream straight pipe section 5-10D;
  2. Ensure that the medium is full of the pipeline;
  3. Try not to install it in a place with strong vibration or interference. If it must be installed in an environment with vibrations, shock absorption measures should be taken.

FAQ

Flow Metering Principals

  • Differential Pressure Flowmeters
  • Velocity Flowmeters
  • Positive Displacement Flowmeters
  • Mass Flowmeters
  • For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters and more

For different working principle, We offer different types of flow meters, like:

  • Differential Pressure Flow Meters
  • Orifice Plate
  • Venturi Tube
  • Flow Nozzles
  • The Sonic Nozzle – Critical (Choked) Flow Nozzle
  • Calorimetric Flowmeter
  • Ultrasonic Doppler Flowmeter
  • Positive Displacement Flowmeter
  • Variable Area Flowmeter or Rotameter
  • Velocity Flowmeters
  • Pitot Tubes
  • Electromagnetic Flowmeter
  • Turbine Flowmeter
  • Vortex Flow Meter
  • Thermal Flowmeter
  • Coriolis Flowmeter
  • Mass Flowmeters
  • Open Channel Flowmeters

Important factors when selecting flow metering devices are:

  • accuracy
  • cost
  • legal constraints
  • flow rate range
  • head loss
  • operating requirements
  • maintenance
  • lifetime

These factors are more or less related to each other. Example – the cost of flow meters increases with accuracy and lifetime quality.

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Sino-Inst is a well-known Exporter, Supplier, Trader, and Service Provider of Nitrogen flowmeter. Sino-Inst offers over 50 Nitrogen flowmeters for flow measurement. About 50% of these are differential pressure flow meters, 40% are the vortex flow sensor, and 20% are the gear flow meter and mass flow meter.

A wide variety of Nitrogen flowmeters options are available to you, such as free samples, paid samples.

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

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