Immersion flowmeter manufacturers | What are the types of thermal gas flowmeters

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1. Research object of pipeline fluid measurement

Pipeline fluid measurement includes the measurement of oil products and natural gas transported through pipelines. Both of these fluid measurements are currently measured in units of volume. The measurement of early oil products was based on weight. In the early 1940s, volumetric flow meters with a diameter of 100 millimeters began to be used on finished oil pipelines. Later on, various types of volumetric flow meters emerged, such as scraper flow meters and waist wheel flow meters. In the 1960s, turbine flow meters emerged, which were small in size, had a wide range of flow rates with vibration, and could maintain high accuracy. They were applied to the measurement of light oil products. In recent years, non immersed ultrasonic flow meters have been increasingly widely used in pipeline fluid measurement. With the improvement of flow meters, the calibration devices for flow meters that are compatible with them have also continued to develop, such as the mechanical bidirectional straight tube volume tube calibration device that appeared in the 1960s; Subsequently, one-way and two-way U-shaped volume tube calibration devices emerged, achieving higher accuracy in flow meter calibration. The measurement of natural gas pipelines began in the 1930s using differential pressure orifice flow meters, which have been in use ever since. Turbine flow meters can adapt to changes in natural gas pipeline throughput and have also been applied in recent years.

2. What are the types of thermal gas flow meters?

Thermal gas flow meters are mainly divided into four categories based on measurement principles and installation forms, which can meet the needs of different

industrial scenarios.

. 1. The thermal distributed gas flowmeter adopts the principle of thermal conduction, and two temperature sensors are installed inside the pipeline: one measures the gas temperature, and the other generates a temperature difference through heating. The larger the gas flow rate, the smaller the temperature difference, thus calculating the flow rate value. Its advantages lie in its simple structure and low cost, but it should be noted that gas composition or temperature and pressure changes may affect measurement accuracy, making it more suitable for working conditions with stable composition. 2. Immersion thermal mass flowmeter sensors are directly inserted into the flowing gas to obtain flow data by measuring the rate at which the gas carries away heat. This type of equipment has industrial grade high precision, with a response time usually less than 1 second, and is particularly suitable for real-time monitoring of large-diameter pipelines, such as process gas flow control in chemical plants. When installing plug-in gas flow meters, there is no need to cut off the pipeline, and the installation is completed through flange components with probes. The probe is equipped with heating elements and temperature measurement modules, which have extremely low requirements for existing pipeline modifications and are easy to install and maintain online. This type of equipment is widely used in fields such as natural gas transmission and distribution, sewage treatment aeration systems, etc.

4. Thermal dissipation mass flow meters convert flow values by precisely controlling heating power and monitoring the degree of heat loss, with the core advantage being a repeatability error of less than ± 0.5%.『SILVER Official Website SERVICE』