Industrial Nitrogen Gas Flow Meters

Industrial Nitrogen Gas Flow Measure Solutions

Industrial nitrogen flow meters are digital flow meters used to measure nitrogen (N2). Nitrogen is an inert gas widely used across various industries. It is required in many processes in the chemical and pharmaceutical industries. In many places, nitrogen, like compressed air, is centrally supplied. Tanks filled with liquid nitrogen ensure a continuous supply and deliver expanded nitrogen to the piping system. Users then extract the required amount of nitrogen from the piping system. Our nitrogen flow meters are easy to use, affordable, and feature-rich.

For industrial-grade N2 (nitrogen) flow measurement, thermal mass flow meters are the right answer in 60% of cases—consider Coriolis only when custody-transfer level accuracy or bidirectional flow is required, provided your nitrogen is dry and clean. In other cases, vortex, orifice, or metal rotor N2 flow meters can be selected based on parameters.

Sino-Inst offers a wide range of flow meters for nitrogen. Please contact us if you need any assistance or information.

RFQ

Features of N2 Gas

Nitrogen, N2, is usually a colorless and odorless gas. In general, nitrogen is less dense than air. Nitrogen accounts for 78.08% (volume fraction) of the total atmosphere and is one of the main components of air. Under standard atmospheric pressure, when nitrogen is cooled to -195.8 ° C, it becomes a colorless liquid. And when cooled to -209.8 ° C, liquid nitrogen becomes a snow-like solid.

The chemical nature of nitrogen is inert and it is difficult to react with other substances at room temperature. So it is often used to make preservatives. Yet, under high temperature and high energy conditions, chemical changes can occur with certain substances to make new substances useful to humans.

• Appearance: Colorless, odorless, and tasteless gas
• Density: Approximately 1.25 kg/m³ (standard conditions), slightly lighter than air
• Melting point: -209.86℃
• Boiling point: -195.79℃
• Critical temperature: -147.1℃
• Solubility: Slightly soluble in water, alcohol, and ether; 100 mL of water at 273 K and 100 kPa can dissolve approximately 2.4 mL of nitrogen gas.
• High stability: Chemically inert at room temperature and pressure, it rarely reacts with other substances and is a typical inert gas.

Common Industrial Uses for N2 Gas

Nitrogen (N2) is consumed industrially as an inert shielding gas, a chemical feedstock, and a cryogenic coolant — with the largest volumes going to oil & gas pressurization, ammonia synthesis, metallurgy (rolling, heat treatment, ladle degassing), electronics manufacturing, and food packaging/freezing.

Featured Industrial Nitrogen Gas Flow Meters

What Is the Best Flow Meter for Nitrogen Gas (N2)?

For most industrial N2 flow measurements, thermal mass flow meters are the preferred choice. They can directly measure flow rate without temperature or pressure compensation, achieving accuracy up to 1%. Furthermore, thermal mass flow meters have no moving parts, resulting in a long service life.

Moreover, thermal mass flow meters have a wide measurement range, meeting the needs of the vast majority of users.

Of course, in some special scenarios, other types of nitrogen flow meters are required. For example, for trade metering, a Coriolis mass flow meter is best; for large pipe diameters and high-temperature measurements, a vortex flow meter can be considered.

5 Types of Nitrogen Flow Meters

Next, let’s take a closer look at the five common types of N2 flow meters.

1. Thermal mass flow meter

Working Principle: The sensor is heated, and the heat carried away by the gas flow is measured—heat dissipation is proportional to the gas mass flow rate, and the mass flow rate is read directly (no temperature and pressure compensation required).

Advantages of N2 Measurement:

• Directly reads mass flow rate (SCFM, Nm3/h)
• Accuracy +1%RD, range ratio 100:1
• High sensitivity at low flow rates, can measure even small flow rates
• Stable Cp of N2, coefficient can be directly used from a table, no recalibration required
• No moving parts, low pressure loss

Disadvantages of N2 Measurement:

• Not suitable for moisture/oil-containing N2 (droplet-laden sensor)
• High cost for large pipe diameters > DN200
• Slow response when the flow field changes rapidly (thermal inertia)
• Requires straight pipe sections before and after the flow.

2. Vortex flow meter

Working Principle: Fluid flows around a vortex generator, creating a Karman vortex street. Measuring the vortex shedding frequency yields the flow velocity → volumetric flow rate (Karman vortex street principle).

Advantages for N2 measurement:

• Economical for large pipe diameters (DN50-DN3000)
• High pressure resistance (<32MPa), high temperature resistance
• No moving parts, maintenance-free
• Good long-term stability, commonly used in N2 main gas supply lines

Disadvantages for N2 measurement:

• Low flow rates cannot be detected (Re < 2×10+, no vortex generation)
• Narrow range ratio, 10:1~30:1
• Pipe vibration can produce false signals
• Output is volumetric flow rate, requiring independent temperature and pressure compensation for mass conversion.

3. Orifice plate flow meter

Working Principle: A standard orifice plate is installed inside the pipeline. Gas flows through, creating a differential pressure. The square root of the differential pressure is proportional to the flow rate (Bernoulli’s equation).

Advantages of N2 Measurement:

• Lowest cost
• Wideest diameter range (DN15-DN2000)
• Complete ISO 5167 standards, providing a basis for calculations
• Suitable for high-flow-rate, stable N2 mains
• No electronic components, resistant to harsh environments

Disadvantages of N2 Measurement:

• Accuracy ±1%~±2%FS (Note: full scale, not reading)
• Narrow range ratio, 3:1~4:1
• Large permanent pressure loss (30%~80% AP)
• Requires temperature and pressure compensation
• Long-term orifice plate wear affects accuracy

4. Rotameter Flow Meter

Working Principle: A float inside a conical metal tube hovers when the airflow thrust and its own weight are balanced. The float’s position corresponds to the flow rate, which is transmitted to an external indicator via magnetic coupling.

Advantages of N2 Measurement:

• Direct on-site reading; some models require no power supply.
• Simple and durable structure.
• High temperature and pressure resistant, stronger than glass tube VA.
• Low price, suitable for low-flow monitoring in the field (N2 purging, instrument gas source).
• Maintenance cost is almost zero.

Disadvantages of N2 Measurement:

• Poor accuracy (+1.5%~±2.5%FS).
• Range ratio is only 10:1.
• Gas measurement requires density/pressure correction; deviation from calibration results in inaccuracy.
• Basic models have no electrical signal output; a magnetic induction module is required for remote transmission.

5. Coriolis mass flow meter

Working Principle: Fluid flow through a U-shaped or straight vibrating tube generates Coriolis force, causing the tube to twist. The phase difference between the two ends of the vibrating tube is proportional to the mass flow rate, directly measuring mass.

Advantages of N2 Measurement:

• Highest accuracy: ±0.1% to ±0.5% of reading (RD), custody transfer grade;
• Ultra-wide turndown ratio: 100:1 to 1000:1;
• Direct mass measurement, unaffected by changes in temperature, pressure, or density;
• Capable of measuring contaminated gases, humid air, and liquid-laden nitrogen (which thermal methods cannot achieve);
• Bidirectional flow measurement—one unit replaces two;

Disadvantages of N2 Measurement:

• The cost is the main concern, as it is 3 to 5 times that of thermal mass.
• Weak signals and reduced accuracy with low-pressure, low-density N₂ (<2 bar).
• Costs rise sharply for large pipe diameters (>DN100).
• High installation space requirements (U-tubes must be arranged vertically and vibration-proofed).
• Additional vibration damping is required in vibration-sensitive environments.

Flow Measurement of Nitrogen

Even though nitrogen gas is usually considered inert, that doesn’t mean its use doesn’t need to be controlled precisely counting on its use. within the aforementioned example involving nitrogen flushing and food preservation, using an appropriate flowmeter to watch the speed of flow can make sure that a correct amount of gas is dispensed for the precise need. That way packages aren’t overinflated, which may end in wasted gas also as packaging or product damage, while also ensuring enough is added to preserve and protect the food products.

A similar need for precise use is involved when nitrogen is employed to make electrical components, especially when spaces must be filled and therefore the walls are otherwise delicate or sensitive to excess pressure. for instance , an excessive amount of gas forced into a diode could lead on to wreck , rendering the part useless.

Since adding gas to a sealed container increases the pressure, it’s important to watch the speed of flow to stay the associated pressure at the proper level of the aim . At times, an RF pickup is a perfect method for monitoring flow as they’re ready to monitor the speed even at near zero speeds. this will be critical in delicate situations or where the quantity being dispensed in especially small, requiring a coffee speed to avoid overfilling.

Nitrogen Mass Flow Controllers (MFC)

A nitrogen mass flow controller (MFC) is a thermal mass flow meter with a built-in control valve and PID loop — it doesn’t just measure N₂ flow, it holds the flow rate at a setpoint regardless of upstream pressure swings or ambient temperature changes. Typical use cases: gas blanketing skids, inerting systems, lab gas dosing, semiconductor process gas, and any line where flow setpoint stability matters more than just measurement.

How to Choose a Nitrogen Gas Flow Meter?

Choosing the right nitrogen flow meter requires comprehensive consideration of various detailed parameters. Based on our experience in nitrogen flow measurement, we suggest you follow these steps:

1. Confirm the pipe diameter and the installation environment. For example, how many straight pipe sections are before and after the planned installation point? Is there a power supply at the installation site?
2. Estimate the flow range. Having a general flow range ensures that the selected flow meter can cover the measurement area.
3. Confirm the pipe temperature and pressure.
   Temperature and pressure are essential parameters regardless of the type of flow meter chosen.
4. Accuracy requirements. Accuracy requirements differ depending on whether it’s for trade measurement or monitoring plant efficiency.
5. Signal output. Is a mechanical local display sufficient? Or are 4-20mA, RS485, or other signals required?
6. Are there any other functional requirements? For example, flow control.
7. Cost budget.

Of course, even with these parameters, you may not be able to choose the most suitable N2 flow meter yourself. You can send your parameters directly to our sales engineers, and we will confirm the solution for you.

Industrial Liquid Nitrogen Flow Meters

Liquid Nitrogen Flow Meter is a Cryogenic Flow Meter. Nitrogen (N2), which is usually a colorless and odorless gas, and generally nitrogen gas has smaller density than air. Nitrogen accounts for 78.08% (volume fraction) of the total amount of the atmosphere and is one of the main components of air. At a standard atmospheric pressure, nitrogen gas was cooled to -195.8 ° C to become a colorless liquid. When cooled to -209.8 ° C, the liquid nitrogen became a snowy solid.

For liquid nitrogen flow rate, Sino-Inst offers turbine flow meters, mass flow meters, and target flow meters. While measuring liquid nitrogen flow, pay attention to nitrogen blanketing for liquid nitrogen storage tanks and pipes. 

Technical Support

Water Flow Meter Types

Water Flow Meters are flow meters measure and show the flow rate of water flow. Water flow measurement is important for inductrial applications, like the wastewater treatment. In principle, water flow meter types are: Electromagnetic (magnetic), Turbine, Ultrasonic, and DP. Coriolis and Oval Gear flow meters can also work for water flow measurement.

Coriolis Mass Flow Meter Technology

Coriolis mass flow meter also called micro motion flow meter. Coriolis mass flow meter is the mass flow meter beasd on the coriolis force. Coriolis mass flow meter and thermal mass flow meter are the most common mass flow meters. Corolis mass flow meters are best choice for all process and custody transfer (CT) applications. Coriolis mass flow meter can measure different values at the same time. Mass, volume flow, density and concentration measurement of liquids and gases.

Natural Gas Flow Meter

Natural Gas Flow Meter, is the inline flow meter for natural gas pipeline. Like: thermal mass flow meter, ultrasonic natural gas flow meter, natural gas turbine flow meter. Intelligent Gas Precession Vortex Flowmeter, and differential pressure flow meter. These are the most common inline natual gas flow meters with digital display. According the natural gas pipeline measurement conditions, select suitable natural gas flow meter. Such as: pressure, temperature, length of straight pipe, diameter of pipe, insertion or remote installation, etc,.

Inline Compressed Air Flow Meters

Compressed Air Flow Meter is the digital flow meter work for the air compressor. Thermal mass, vortex, portable ultrasonic, and DP flowmeters are commom gas flow sensors. Air consumption is an important info for industrial inline gas flow pipe. Compressed air is the most expensive form of energy in manufacturing plants. And compressure air accounts for up to 20% of the overall energy costs.

Wastewater flow meter

Wastewater Flow meters are flowmeters for water and wastewater treatment. Electromagnetic flow meters are suitable for open channel and underground industrial water pipes. Magnetic flow meters can be Remote type, compact type, insertion type. And ultrasonic flow meters are another choice, if you can not change your pipes. Both ultrasonic flow meters and magmeters are inline flow meters.

Digital Water Flow Meter

Digital water flow meter, is the electronic flow meter, which display the flow rate of water. Different Industrial liquid, different pipe for 1 inch, 2 inch, use different flow meters. The different sensors include turbine, ultrasonic, orifice plate, venturi, or with shut off switch. All these flow meters, with LCD display, 4-20mA output, or other outputs.

Nitrogen flow meter supplier

Over 10 nitrogen gas flow meter products are offered for sale by Sino-Inst on sino-inst.com, of which flow meters accounts for 99%, gas meters accounts for 50%, and gas analyzers accounts for 1%. A wide variety of nitrogen gas flow meter options are available to you. Sino-Inst sells nitrogen gas flow meter on sino-inst.com, mainly located in China. The top countries of sales are China, Europe, and South Korea, from which the percentage of nitrogen gas flow meter supply is 99%, 1%, and 1% respectively.

Li Rui

Li Rui is responsible for the R&D and design of the company’s automated instrumentation products, leading the development project of the intelligent pressure transmitter. Start with demand analysis and communicate with the market and customers to obtain key parameters, such as measurement range (0 – 10MPa) and accuracy requirements (±0.1%FS).

Responsible for designing hardware circuits, selecting high-performance microprocessors and pressure sensor chips, and building signal conditioning circuits to achieve accurate signal acquisition and processing. On the software side, he wrote C language programs to implement algorithms such as data linearization and digital filtering, ensuring the stability and accuracy of measurement data. After the product was launched, sales reached 5 million yuan in the first year, with positive market feedback, opening up new market areas for the company.

sino-inst.com