Which kind of sensor to measure gas ? A gas is one of the four fundamental states of matter (the other three are solid, liquid, plasma). The sensor used to measure gas called gas sensor. There have gas pressure sensor, gas flow sensor etc.
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Backgroud: Sensor to measure gas
A gas is one of the four fundamental states of matter (the other three are solid, liquid, plasma). Gases can be composed of single atoms (such as rare gases), simple molecules composed of one element (such as oxygen), and compound molecules composed of multiple elements (such as carbon dioxide). The gas mixture may include various gaseous species, such as air. A significant difference between gases and liquids and solids is that the gas particles are widely spaced apart. This separation makes it difficult for the human eye to detect the colorless gas. A gas is a fluid like a liquid: it can flow and deform. Unlike liquids, gases can be compressed. If there is no restriction (container or force field), the gas can diffuse, its volume is not restricted, and it is not fixed. The atoms or molecules of a gaseous substance can move freely with each other.
Gas Pressure Sensor
Gas pressure sensor is a conversion device, mainly used to measure the absolute pressure of the gas, and can be applied for pressure measurement in terms of blood pressure, wind pressure, pipeline gas, etc. Its performance is stable and reliable; it is mainly applicable to physical experiments related to gas pressure, such as gas law. It is also possible to measure the pressure of dry and non corrosive gas in biological and chemical experiments.
The main sensing element of the air compressor is a thin film which is sensitive to pressure and a thimble control. It connects a flexible resistor to its circuit. When the pressure of the measured gas changes, the deformation of the film moves the thimble, and the resistance of the resistor also changes. The signal voltage, ranging from 0 to 5, is obtained from the sensing element, and will be received by the data collector after A/D conversion. The data will then be transmitted to computer in an appropriate way. The main component of many air pressure sensors is the variable silicon capacitance sensor. When the atmospheric pressure out of the sensor changes, the thimble moves accordingly, causing the elastic deformation of the monocrystalline silicon capacitance sensor, which leads to the change of capacitance. And the measurement of the gas pressure is achieved through observing the changes of the capacitance.
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Gas Temperature Sensor
A gas temperature sensor is a critical device used in various industries, including mining, metallurgy, and chemical processing. It measures the temperature of gases in different processes, helping to maintain optimal operating conditions and enhancing safety measures. The data collected by these sensors can help in early detection of any anomalies, thus preventing potential disasters. In the context of sustainability, monitoring gas temperatures can contribute to energy efficiency and reduce environmental impact. For instance, in the chemical industry, accurate temperature measurements can optimize reactions, reducing energy use and minimizing waste.
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Digital gas flowmeter
1).Digital gas turbine flowmeter
The gas flow through the flow meter sensor pushes the turbine blades to rotate. The number of revolutions of the impeller is proportional to the volume of gas passing through the turbine flow meter.
*Digital gas turbine flowmeter sensor features
The digital display shows the instantaneous flow of gas and the cumulative flow of gas. The FMT812 temperature and pressure compensated gas flow sensor can digitally display the gas temperature, pressure and standard instant flow (Nm3/h) and total flow in standard condition Nm3.
2).Digital thermal mass gas flowmeter
The thermal gas mass flow meter is a gas flow meter sensor that measures the mass flow of gas using the principle of thermal dispersion, and can realize high-precision mass gas flow measurement
*Digital thermal flowmeter Features
All thermal gas flow meters have a digital screen display that shows the instant and totalized gas flow.
The thermal gas flow meter can achieve gas measurement under standard conditions without external temperature and pressure compensation.
Our digital thermal dispersion flow meter has 4-20ma and RS485 communication for various control and monitoring purposes.
Process connection can be flange type or insertion type.
Digital micro-flow gas flow controller for measuring small flow gas, flow meter sensor size from DN3~DN10.
3).Digital metal tube rotor flow meter for gas measurement
Rotor flowmeter, also known as a float flowmeter, is a variable area flowmeter consisting of a conical tube and a rotor (also called a float) that can be moved up and down in a conical tube.
digital rotameter gas air
*Digital Rotameter Features
Digital Display to show instant flow and total flow of measured gas
The digital rotameter can be battery powered or powered from 24V DC or 220V AC
Digital gas rotameter can have 4-20Ma output, alarm output, HART, RS485 communication.
4).Digital gas vortex flowmeter
The vortex flowmeter is a flowmeter sensor for measuring gas, steam or liquid produced according to the Karman vortex principle.
vortex digital gas flow meter
*Digital gas vortex flowmeter features
Digital gas vortex flowmeters measure volumetric flows such as carbon dioxide(CO2), oxygen(O2), natural gas, and biogas.
Digital display shows instant flow and total gas flow information
Output 4-20mA or pulse
The digital gas vortex flowmeter can have RS485 and HART communication to meet various control needs.
The vortex gas flow meter is powered by 24V DC.
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LPG Gas Flow meter
We offer different type industrial LPG gas flow meters with different functions with accurate and reliable performance, such as thermal dispersion flow meter, Coriolis flow meter, gas turbine flow meter, vortex flow meters. SenTec manufactured butane/propane gas flow meter at competitive low price from China gas flow meter manufactures.
LPG gas (Liquefied petroleum gas) is a kind of hydrocarbon with propane and butane as its main components; it is obtained as a by-product in the process of oil and natural gas exploitation and refining. iquefied petroleum gas is so important, and the flowmeter for measuring liquefied petroleum is also purchased in large quantities.
Composition of LPG Gas
Main ingredients: propane (C3H8), butane (C4H10)
Others: methane, ethane, propylene, butane
LPG Gas flow meter features
* In-line type gas flow meter or insertion type LPG gas flow meter sensor
* Digital gas flow meter with electronic display to show instant flow
* Volumetric flow meter or gas mass flow meter
* Can be made into high pressure type gas flow meters
* Gas flow meter with Ex-proof
* High accuracy gas flow meter
* Various sensor sizes, such as 1 inch, 2 inch, 4 inch, 6 inch, 8 inch LPG gas flow meter sensor
* Gas flow transmitters with different output and protocol, such as 4-20Ma, pulse, Hart ,Modbus
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Biogas Flow Meter
Biogas flow meters have insertion gas flow probes as well in-line flow sensors. The main features of SenTec biogas flow meters are competitive pricing as well as rugged construction. This ensures that the biogas flow meter sensors are built to last. It is important to understand what biogas is before purchasing a biogas flow meter. Biogas is a unique mixture of methane, CO2, H2s as well as moisture. This mixture is referred to as biogas. This mixture is unique and is formulated with these four main elements. Thermal mass flow meters are effective at measuring different types of gas. Thermal mass flow meters are able to measure clean gas and mixed gas. Therefore thermal dispersion flow meters are the best option for these types of measurements. The results from these flow metering instruments can be used for a variety of purposes.
Features of Biogas Flow Meters
* Thermal mass flow meter with compact or remote gas flow transmitter
* Thermal dispersion flow meters has low flow sensitivity to detect biogas low flow
* 316L flow sensor probe is resistant to hydrogen sulfide
* No external temperature and pressure compensation needed
* No moving part inside the gas flow sensors and low maintenance work need after installation.
* There are different gas sensor sizes available for use. 1 inch , 2 inch, 4 inch, 6 inch , 8 inch .,etc
* Biogas flow meters come with power supply that starts at 24VDC or 220V AC
* Electronic gas flow transmitter with pulse or 4-20mA output, also alarm switches
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CO2 gas flow meters
Carbon dioxide (CO2) gas is a colorless, odorless or slightly sour gas at normal temperature and pressure. It is also a common greenhouse gas, or one of the components of air (about 0.03% of the total volume of the atmosphere)
Carbon dioxide Usage
Gaseous carbon dioxide for carbonized soft drinks, pH control of water treatment processes, chemical processing, food preservation, inert protection of chemical and food processing processes, welding gases, plant growth stimulators, for hardening molds and cores in casting and for Pneumatic devices are also used as diluents for germicidal gases.
Carbon dioxide is very widely used and requires frequent measurements of carbon dioxide usage.
We supply digital type CO2 gas flow meters, it has features as below:
CO2 gas flow meters Features
1) Digital display to show instant carbon dioxide flow rate and total flow consumption
2) Digital gas flow meter to have 4-20mA or pulse output ,MODBUS,HART
3) We can flow metering device to measure volumetric flow at working condition or have temperature and pressure compensation to get standard flow value.
4) Different kinds process connection, such as wafer or flange or insertion type or thread connection type.
5) High accuracy can reach to 1.0% upon request
6) Various flow meter technologies available, such as thermal mass flow meter, gas turbine flow meter, vortex flow meter, coriolis mass flow meter and so on.
7) Size from DN15 to DN2000 , normally request is 1” CO2 flow meter, or 2 inch digital inline gas flow meter, or 3” & 4” gas meter
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Gas Analyzer
A gas analyzer is a tool used in various industries to measure the concentration of specific gases in a sample. It provides essential information for monitoring and controlling industrial processes, ensuring safety, and complying with environmental regulations. In the chemical industry, gas analyzers are used to measure emissions, monitor process efficiency, and detect leaks. They can measure a wide range of gases, including carbon dioxide, oxygen, nitrogen, and various volatile organic compounds. Advanced gas analyzers can also provide real-time data, helping industries to quickly respond to changes and optimize their operations.
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