Where to manufacture sensors for thermal gas flow meters

SHQL series thermal gas mass flow meter can be used to measure air, nitrogen, oxygen, ozone, helium, helium, hydrogen, methane, ethane, propane, ethylene, propylene, carbon monoxide, carbon dioxide, laughing gas, sulfur dioxide, hydrogen sulfide, hydrogen fluoride, phosphine , chlorine, ammonia, freon, isobutane, n-pentane, methane, Gas, biogas, all kinds of blast furnace coke oven gas, water gas, semi-water gas, mixed gas, natural gas, dusty flue gas, chemical mixture gas and other single or mixed gases (except acetylene gas) standard volume flow or mass flow. In terms of structure, it can be used with various accessories to form pipeline or plug-in flowmeters. It is typically used in the metering and control of various gases in the gas-making industry, various gases and flare gases in the petrochemical industry; Boiler primary air, secondary air and coal grinding wind in the power industry; All kinds of gas, air and hot air in the iron and steel industry, and high-purity gases in the electronics industry; heating and ventilation in air conditioning systems and the nuclear power industry; air and biogas from aeration tanks in the water treatment industry; air supply and gas extraction in the coal mining industry; Air in the air-fuel ratio test of the engine in the automobile and motorcycle manufacturing industry; Measurement of gas flow in the laboratory, etc.

Features of thermal gas mass flow meters.

Without temperature and pressure compensation, a single meter can directly measure the volume and mass flow of the gas under the standard state.

The lower limit of flow measurement is extremely low, almost from zero, which is unmatched by other types of gas flow meters.

High precision, fast response speed, and a range ratio of up to 100:1, especially suitable for accounting and measurement.

Virtually no pressure loss, especially suitable for measuring large pipe diameters and low flow rates.

Inside, the rugged 316L stainless steel or tantalum metal encapsulated sensor is pollution-free and anti-sticky, and can measure strong corrosive gases such as chlorine and phosgene.

One-piece or split structure, pipeline or plug-in form, the whole mechanism is simple to build, and the amount of installation and maintenance is very small.

On-site display of instantaneous, cumulative flow, signal output, upper (lower) limit alarm, etc.

There is no need to open the lid to clear the cumulative amount.

The optional rectifier device can greatly reduce the requirements for the front and rear straight pipe sections.

Measuring range: (20 in standard state.)

A gas flow meter is a meter that measures the flow rate of gas. Installed in the line to record the amount of gas flowing. It can measure gas, air, acetylene, phosgene chain burial, pulse and hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine, gas, biogas, carbon dioxide, oxygen, compressed air, argon, toluene, benzene, xylene, hydrogen sulfide, sulfur dioxide, ammonia, etc.

Gas flowmeter application fieldThis product is widely used in steel mills, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection and other industries. Petrochemical applications: Advantages of flare gas emission monitoring products:

Wide range ratio, the sensor is not easy to block, can be plugged and unplugged and cleaned, suitable for a wide range of gas power applications: boiler primary air, secondary air, coal grinding air measurement product advantages: easy installation, no straight pipe section requirements, low pressure loss, no temperature and pressure compensation, can be used under harsh conditions (such as:

The air contains dust, particles, serious wear, low pressure, etc.) Metallurgical applications: blast furnace gas, coke oven gas measurement product advantages: calibration according to the actual medium composition, the composition change can be corrected, the sensor can be cleaned, and the insertion length can be adjusted by any trace Electronic applications:

Advantages of high-purity gas mass flow measurement products: direct measurement of mass flow without temperature and pressure compensation, the sensor head is highly polished, and can be used for heating and ventilation productsAdvantages: The product is responsive, reliable in operation, and there are no strict requirements for the installation of straight pipe sectionsWater treatment applications:

Advantages of measuring the air flow of the aeration tank: dirt and dust resistance, truly no pressure drop, and easy installation on site.

The measurement range of the gas flowmeter can vary according to different types and specifications, generally speaking, the measurement range of the gas flowmeter is usually determined by its flow measurement range and working pressure range.

The flow measurement range refers to the minimum and maximum flow values that can be measured by a gas flow meter, which is generally expressed as volumetric flow or mass flow. Common gas flow meters measure from a few milliliters of minutes to thousands of liters of minutes.

The operating pressure range refers to the minimum and maximum pressure ranges in which the gas flow meter can work normally. Some gas flow meters are suitable for low-pressure environments, while others are suitable for higher pressure ranges.

It should be noted that different gas fluids have different densities and viscosities at different pressures and temperatures, which will affect the flow properties of gas fluids in gas flow meters, so when choosing a gas flow meter, the physical properties of the gas and the application conditions of the measurement should be considered.

1. Introduction to air flow meter.

The role of the air flow meter.

The air flow meter measures the amount of fresh air entering the engine intake manifold and the intake air temperature, and the ECU uses this information to make injection corrections, smoke limits, and EGR opening control.

2.Installation location.

The sensor is mounted on the engine intake duct and at the rear end of the air filter.

3.How it works.

The principle of an air flow meter.

The air flow sensor is to integrate some electronic components on a ceramic substrate, when the engine is working normally, the diaphragm is first heated, and the fresh air flows through the sensor will take away part of the heat, at this time the ECU will control the Wheatstone bridge on the diaphragm to supplement the diaphragm, which will cause a change in the electrical signal, when the signal is transmitted to the ECU, the ECU will calculate the air intake according to this change.

The principle of the air temperature sensor.

The inlet air temperature sensor is a negative temperature coefficient resistor, when the inlet air temperature changes, the resistance value of the resistor will change, causing a change in the signal voltage at the ECU terminal, and the ECU calculates the inlet air temperature based on this change.

Determination of the direction of the airflow.

There is a same temperature resistance at both ends of the hot film of the air flow meter, and when the air flow through the hot film, it will take away part of the heat, so the temperature at the front end of the hot film is lower than the temperature of the rotten town at the back end, and the ECU judges the direction of the air flow according to this signal!

4.Wiring diagram of an air flow meter.

5.Control policy.

The ECU will monitor the working condition of the air flow meter at all times, and when the ECU judges that the air flow meter is faulty, it will take corresponding control, and the bending pins are as follows.

The engine mil light is lit, the EGR system is withdrawn from work, and the exhaust gases will no longer participate in the system work;

The engine speed will be limited to a certain speed, and the power will be limited;

When the air flow meter fails, the engine start is not affected and can be started normally;

Second, the detection of air flow meter:

Fault codes related to air flow meters.

It belongs to the thermal gas flow meter, and the first-class air flow meter produced by Tianjin Xuner Instrument works stably, with high measurement accuracy and long service life.

Thermal flow meters are used in a wide range of applications to calculate the fluid's fluid-sensitive start-up state based on its temperature and volume. It is an application and embodiment of the principle of heat conduction, the thermal bypass mass flowmeter is one of its types, the thermal flowmeter is basically based on measuring gas, so many people think that this instrument can only be used to measure gas, and the function is relatively simple, so is this understanding correct?

This decision is a bit one-sided, gas is only the main medium it is used to measure, because whether it is the working principle of the thermal flow meter, or the product structure is more suitable for measuring gas, so it will cause the illusion that only gas can be measured. In addition to gases, some liquid levels, semi-solid media, thermal flow meters can also be measured.

The measurement principle used by the thermal flowmeter to measure the flow rate of liquids is basically similar to that of gas, and can be used to measure the flow rate of liquids and semi-solids such as clean water, sewage, oil, etc.

Through today's bridge, I believe you know that thermal flow meters can not only be used to measure gases, but also flow measurement of liquids and other types of media. However, it should be noted that since measuring the medium outside the gas is not what the thermal flowmeter is good at, it is necessary to learn from the manufacturer whether the type of product used is suitable for measuring liquid and other media before the measurement begins, and ask for instructions on how to use it, and operate in strict accordance with the requirements of use.