Thermal gas mass flow meter insertion type

Overview.

Thermal gas mass flow meter is a new type of instrument used to measure and control the mass flow of gases, which is designed based on the principle of thermal diffusion (heat conduction). The instrument adopts the constant temperature difference method for accurate measurement of gases, and can be applied to monitor the flow of air, oxygen, nitrogen, argon, helium, hydrocarbon gases and other gases in petroleum, chemical, steel, metallurgy, electric power, light industry, medicine, environmental protection and other industrial sectors.

◆Product implementation standard: GB/T20727-2006 (national standard)

◆General standard of flange: GB/T9119-2010 (national standard)

Working principle.

The sensor part of the thermal gas mass flow meter consists of two reference-level platinum resistance temperature sensor, the instrument works, a sensor uninterrupted measurement of the medium temperature T1; the other sensor since heated to a temperature higher than the medium T2, it is used to sense the fluid flow rate, called the speed sensor. The temperature △T = T2 - T1, T2 > T1, when there is fluid flow through, as the gas molecules collide with the sensor and take away the heat of T2, so that the temperature of T2 drops, if you want to keep △T constant, you have to increase the supply current of T2, the faster the gas flow rate, the more heat taken away, the gas flow rate and increased heat there is a fixed function of the relationship, which is the principle of constant temperature difference.

Because the sensor temperature than the medium (ambient) temperature is always automatically constant higher than a certain temperature (30 ~ 50 ℃ or so), so the thermal gas flowmeter from the principle of temperature compensation is not required.

From (1) (2) (3) formula can be seen, the flow rate and working pressure, gas density, working temperature function relationship has been determined. Constant temperature differential thermal gas mass flowmeter is not only not affected by temperature, but also not affected by pressure, thermal gas mass flowmeter is a direct type mass flowmeter, the user does not have to be corrected for pressure and temperature.

Insertion type thermal mass flow meter flow range

Insertion type thermal mass flow meter can be estimated by the corresponding flow rate range 0.56 ~ 56Nm / s, the calculation formula is as follows:

Features.

1. For gas flow measurement without temperature and pressure compensation, easy and accurate measurement, can get the gas mass flow rate or standard volume flow rate.

2. Wide range ratio, up to 100:1 or more, can be used for gas leak detection, especially in large pipe diameter, low flow rate, large changes in the flow range and very small flow measurement has obvious advantages.

3. Good anti-vibration performance, the accuracy is not affected by vibration.

4. Long service life, sensor without moving parts and pressure sensing components, simple installation, easy maintenance.

5. Fast response speed, small pressure loss, good repeatability.

6. Digital design, overall digital circuit measurement, LCD display intuitive and clear, accurate measurement.

7. Equipped with RS485 communication module or HART protocol (optional), with the upper computer can realize centralized management.

因椭圆齿轮流量计出厂检验检测量程范畴为0-10%，而具体使用的量程范畴为0-25%，与检测值相比变化较大，故决定调高赔偿电势E(本底辐射电势)。④状况分析总结依据现场设备的改造，氧量值恢复过来，能够确保锅炉的正常运转。

氧化锆氧量仪的改造意义和经验氧化锆测氧仪具备构造简易、响应速度短、检测范围宽、应用温度高、运作可靠、安装便捷、维护量小等优势。因而，电磁流量计传感器的关键运用可归纳为下列五个方面：①烟尘测氧：主要用于发电站、炼油厂、冶炼厂、化工厂、轻纺造纸厂、食品厂、等公司。②尾气排放测量：目前主要用于载客的小车和轿车等。③钢液测氧：主要用于钢铁厂和炼铜厂等冶炼公司。④稀有气体测氧：主要用于钢铁厂、空生产基地、化工厂和电子企业等。⑤物化研究：主要用于高温化学反应中热学和力学参数测量。