Professional Nitrogen Gas Flow Meter Manufacturer
  • Simple structure and easy installation
  • Customized connection
  • Conveniently maintenance and aftersale service
  • Anti-explosion-proof design
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BCST your Expert Nitrogen Gas Flow Meter Supplier in China

BCST nitrogen gas flow meter is used in many places to prevent fires and explosions in potentially explosive areas. The BCST Nitrogen gas flow meter is essential for gas and liquid measurements. In addition, they are helpful for storage and quantification in various commercial situations. BCST nitrogen flow meters are reliable and designed for maximum accuracy.

The BCST nitrogen gas flow meter is used in various industries, from general process control to scientific research and development. Nitrogen is required in many processes in the chemical and pharmaceutical industries. However, it is mainly used as a protective gas to prevent an explosive atmosphere.

BCST nitrogen gas flow meter was developed to ensure reliable system monitoring and tracked and 100% tested by Quality Assurance to provide flexible operation. For inquiries, please get in touch with

BCST is one of China’s leading reliable nitrogen gas flowmeter manufacturers. If you’re searching for an experienced manufacturer for your next project with strong technical background, professional team, and budget-friendly products, BCST is your most suitable choice.

BCST can provide customized nitrogen gas flow meters to support customers’ requests. From packaging to delivery, you’ll receive BCST’s most detailed service.

BCST’s technical team will provide you with professional guidance during usage or installation. With ATEX, ISO, SIL2, RoHS, and CNEX, BCST will provide you with high-quality nitrogen gas flow meters at a competitive price.

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video-nitrogen gas flowmeter

1. What’s the working principle of the nitrogen gas flow meter?

For Vortex nitrogen gas flow meter:

A vortex nitrogen gas flow meter is a new type for closed pipe fluid flow measurement based on the Carmen vortex principle. The vortex flowmeter has good media suitability. Without temperature and pressure compensation, it can directly measure the working volume flow of steam, air, gases, water, and liquids. It is also equipped with temperature and pressure sensors to measure standard volumetric and mass flow rates. It is the ideal alternative to throttle flow meters. To improve the vortex nitrogen flowmeter’s high temperature and vibration resistance, BCST has developed an improved vortex flow sensor. Due to its unique construction and selection of materials, this series of sensors can be used under severe conditions of high temperatures (350°C) and strong vibrations (≤1g).

In practice, the maximum flow rate is often well below the upper limit of the meter. As the load changes, the minimum flow rate tends to fall below the lower limit of the meter. It prevents the instrument from operating in its optimum operating band. To solve this problem, you can use a reducer to increase the flow rate at the measurement. At the same time, a smaller diameter gauge is also used to facilitate the measurement. However, these reducers must be rectified using a straight section of pipe with a length of 15D or more between the reducer and the meter. It makes machining or installation extremely inconvenient.

For this reason, BCST has developed a reducer rectifier with a curved longitudinal section shape. It has multiple rectification functions, increasing the flow rate and changing the flow distribution. You can combine it with a vortex flowmeter in a single unit. It eliminates the need for additional straight pipe sections and reduces the requirement for straight pipe sections in the process pipe. It makes installation very easy.

The battery-powered in-situ display gas vortex flowmeter uses micro-power technology for ease of use. It is powered by lithium batteries and can run uninterrupted for more than a year. It saves on the purchase and installation costs of cables and display instruments. It can also display instantaneous and cumulative flow rates in situ. Temperature-compensated vortex flow meters with temperature sensors can directly measure the temperature of saturated steam and calculate the pressure to display the mass flow rate of saturated steam. The temperature- and pressure-compensated type is integrated with temperature and pressure sensors. It can directly measure the temperature and pressure of the gaseous medium when used for gas flow measurement. It can also display the standard volume flow rate of a gas.

For thermal nitrogen gas flow meter:

Thermal flow meters are flow meters based on the principle of thermal diffusion. It means that when a fluid flows through a heated object, the amount of heat lost from that object is proportional to the flow rate of the fluid. The sensors in this range of flow meters have two standard-grade RTDs, one acting as a heat source and the other measuring the temperature of the fluid. As the fluid flows, the temperature difference between them is linearly related to the magnitude of the flow rate. This relationship is then converted into a linear output of the measured flow signal using microelectronic control technology.

According to the King’s law of thermal effects, there is a mathematical relationship between the heating power P, the temperature difference ΔT (TRH-TRMG), and the mass flow rate Q. P/ΔT = K1 + K2 f(Q)K3 K1, K2, and K3 are constants related to the physical properties of the gas. The thermal gas mass flow meter has a unique way of measuring temperature differences. It overcomes the disadvantage of not measuring gas flow due to the gas’s large zero-point drift caused by water, oil, impurities, etc. You can also use it to measure the mass flow of wet gases. For example, we can detect air volume (velocity) in underground air extraction, supply, and exhaust systems in real-time.

2. What are the features of nitrogen gas flowmeters?

For vortex nitrogen gas  flow meter:

◆Nitrogen flow meters allow for more precise control to save costs.

◆The nitrogen flow control also prevents the nitrogen flow from being too high, resulting in insufficient heat replenishment.

◆The correct amount of nitrogen can be known.

For thermal nitrogen gas flow meter:

◆Easy installation, simple maintenance, bi-directional detection, anti-vibration

◆Up to 24 points of flow measurement

◆Calibration of the output analog quantity with multi-point non-linear curve correction

◆Wide measuring range ratio of 100:1

◆Simultaneous detection of flow rate and temperature, switchable display

◆With large diameter and small flow measurement, leak detection is possible

◆Proprietary technology “double balance structure” encapsulated sensor

◆Proprietary high humidity and high-temperature algorithm, medium temperature up to 500℃

◆Direct mass flow detection without temperature and pressure compensation

3. What are the technical parameters for nitrogen gas flowmeters?

For vortex nitrogen gas  flow meter:

◆Measuring medium: Nitrogen

◆Caliber specification

Wafer type:25,32,50,80,100

Flange type:100,150,200

Flow rate measurement range Normal flow rate measurement range is 5~50m/s for gas

◆Measurement accuracy 1.0 level 1.5 level

◆The temperature of the measured medium: room temperature -25℃~100℃

◆High temperature -25℃~150℃ -25℃~250℃

◆Output signal: Pulse voltage output signal.High-level 8~10V.Low-level 0.7~1.3V

◆The pulse duty cycle is about 50%, and the transmission distance is 100m

◆Pulse current remote transmission signal:4~20 mA. The transmission distance is 1000m

◆Temperature: -25℃~+55℃ Humidity: 5~90% RH50℃

◆Material Stainless steel, aluminum alloy

◆Power supply DC24V or lithium battery 3.6V

◆Explosion-proof grade Intrinsically safe iaIIbT3-T6

◆Protection class IP65

For thermal nitrogen gas flow meter:

◆Applicable medium: nitrogen

◆Measuring range: 0.05 – 120m/s

◆Working temperature:-40℃ – 510℃

◆Ambient temperature:-40℃ – 85℃Humidity less than 90%RH

◆Pressure drop: negligible for pipes with a diameter greater than or equal to 3 inches

◆Power requirements.

18 – 30VDC max 600mA

180 – 230VAC Max 2.5W

100VAC max. 3.15W

◆Output signal: linear 4-20mA proportional to mass flow rate linear 4-20mA proportional to temperature

◆Accuracy: 1% of reading ±0.5% of the full scale


◆Resistance to pressure:4.2MPa

◆Response time: ≤850ms

◆Housing material: die-cast aluminum, A2/A4 optional

◆Probe material: 316L, tantalum, titanium, etc.

◆Ball valve: 316L

◆Tight fitting:316L/304

◆Flange: 316L/304

◆Alarm output: relay normally open contact capacity 220AC/3A or 24VDC (only for the flow value of the alarm output), can be temperature output

◆Display: Widescreen LCD, parameters, and variables can be set by keys on the panel (with password protection)

◆Protection grade: IP65 (different grades for different manufacturers)

4. What are the advantages of nitrogen gas flowmeters?

For vortex nitrogen gas  flow meter:

◆There are no mechanical moving parts inside the sensor, high reliability, and low-pressure loss.

◆Wide temperature and pressure range: -40 to 350°C, 0 to 16Mpa.

◆Wide range of measurement, high precision measurement.

◆Measurement results are not affected by fluid density, pressure, temperature, viscosity, and other parameters

◆Advanced digital signal processing technology, low lower limit, excellent anti-vibration performance

◆The range of power supply voltage inputs is very wide. It can range from 12V to 42V to suit a variety of complex power supply environments

◆Intrinsically safe design with its own internal Zener safety isolation barrier.


For thermal nitrogen gas flow meter:

◆Proprietary flow data model algorithms; fuzzy theory control of temperature and humidity algorithms.

◆High-performance intelligent microprocessor and analog-to-digital, digital-to-analog conversion chip.

◆True mass flow meter, no temperature and pressure compensation for gas flow measurement, easy and accurate measurement. Can get the gas mass flow rate or standard volume flow rate.

◆A wide range ratio can measure the flow rate up to 100Nm/s bottom to 0.5Nm/s of gas, which can be used for gas leak detection.

◆Direct mass flow measurement without temperature and pressure compensation.

◆Suitable for all kinds of single or mixed gas flow measurements.

◆Good shock resistance and long service life. The sensor has no moving parts and no pressure sensing parts, so vibration is not affected by measurement accuracy.

◆Easy to install and maintain. In the case of a site, conditions allow you can achieve non-stop installation and maintenance.

◆Digital design. The whole digital circuit measures for accurate measurement and easy maintenance.

◆Using RS-485 communication or HART communication, you can achieve factory automation and integration.

◆Flow measurement in underground mine ventilation or exhaust systems.

5. What are the applications for nitrogen gas flowmeters?

Nitrogen gas flow meters have a wide range of applications. There are several broad applications for flow measurement technology and instrumentation in the following areas.

Public works – Detection of electricity, gas, water treatment

◆Pipeline gas

◆General systems



◆Natural gas

◆Liquefied gas

◆Boiler preheating air

Oil and gas industry

◆Energy exchange

◆Oil well gas recovery

◆Gas metering

◆Gas quality analysis

◆Leak testing

◆Gas Measurement

◆Flare gas monitoring

Power industry

◆Gas measurement in fuel system gas distribution

◆Measurement of various gases in boilers and auxiliary systems

◆Gas measurement in gas furnaces

◆Hydrogen measurement

◆Measurement of primary and secondary air in power plant blast furnaces

Chemical industry

◆Flue gas cycle monitoring

◆Gas flow measurement in sampling systems

◆Gas flow measurement in induced draft fans

◆Ammonia measurement in fertilizer plants

◆Flow measurement of various gases in battery plants

Metallurgical industry

◆Gas measurement in iron and steel plants

◆Blast furnace gas measurement in ironmaking plants

◆Coke oven gas measurement in coking plants

◆Measurement and control of heating furnace gases (blast furnace gases, cooking gases, natural gas, etc.) in steel rolling mills

◆Control of hydrogen, oxygen, nitrogen, and other gases in heat treatment quench furnaces

Pulp and paper industry

◆Gas measurement in wastewater treatment systems

◆Flue flow monitoring

◆Recovery of secondary/tertiary air in boilers

◆Measurement of gases and supply air in boilers

Food and pharmaceutical industries

◆Fresh air addition in processing operations

◆Carbon dioxide handling in breweries

◆Hot airflow in bottle sterilizers

◆Gas flow measurement in thermal oxidation processes

◆Ventilation systems

◆Boiler air intake and exhaust and process control

Environmental protection

◆Gas measurement in biogas utilization processes

◆Chlorine gas measurement in chlorine treatment processes

◆Gas measurement in aeration tanks during wastewater treatment

◆SO2 and NOX emission monitoring in flue gases

Other industries

◆Plant compressed air measurement

◆Fuel control of powder/gas ratios in pulverized coal combustion processes

◆Hot gas flow control of emissions from vertical mills in the cement industry.

6. What are the installation considerations of nitrogen gas flowmeters?

For vortex nitrogen gas flow meter:

◆A vortex flowmeter can be installed indoors or outdoors.

◆In a harsh environment, outdoor installation should pay attention to the protection to prevent the climate outside the environment on the flowmeter table body corrosion.

◆Vortex flowmeter in the pipeline can be installed along the axis of the vertical pipe direction at 360 ° arbitrary, can be horizontal, vertical, inclined installation.

◆When measuring liquids, you must fill the pipeline with liquid, so in the sensor’s vertical or inclined installation, the direction of fluid flow must be from the bottom up.

◆A vortex flowmeter needs to be installed in the pipeline without mechanical vibration. If the pipeline has a vibration, change the installation position or do a fixed bracket.

◆Vortex flowmeter should avoid installation in the magnetic field is relatively large, strong radiation, small space, maintenance is not convenient occasions, reduce external interference.

◆Vortex flowmeter before to avoid the installation of valves and in the upstream side, the downstream side should be left long enough straight pipe section.

◆When installing the vortex flowmeter, the inner diameter of the pipe must be the same as the inner diameter of the sensor.

◆If different, the diameter of the sensor should be slightly larger than the pipe. The error between the sensor diameter and the inner diameter of the pipe should be ≤ 3%.

For thermal nitrogen gas flow meter:

◆If the converter is installed outdoors, you must add an instrument case to avoid rain and sunlight.

◆Prohibit installation in strongly vibrating situations and environments with large amounts of corrosive gases.

◆Do not share an AC power supply with equipment that pollutes the power supply, such as frequency converters, welding machines, etc. If necessary, add a purified power supply to the converter.

◆The integral insertion type should be inserted into the axis of the pipe to be measured. Therefore, the length of the measuring rod depends on the diameter of the pipe to be measured. Therefore, it must be specified in advance when ordering. If it is not possible to insert it into the axis of the pipe, the factory will provide a calibration factor to complete an accurate measurement.

◆The pipe section type uses a flange connection, in line with the national standard GB / T9119-2000.

◆When opening the housing, must first power off.

◆When removing the sensor, pay attention to the pipeline pressure, temperature, or gas with no toxicity.

◆The sensor is not sensitive to small amounts of dust. However, when used in dirtier environments, You should also clean them regularly. Otherwise, the measurement accuracy will be affected.

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