Detailed explanation of the functional characteristics of thermal mass flow meters
Release time：
06 Jun,2022
Summary
A thermal mass flow meter is a new type of high-temperature, low-pressure measuring instrument, widely used in the petroleum, chemical, aerospace, metallurgical, food, and papermaking industries. Thermal Mass Flow Meter It has a temperature control system with a reasonable structure and excellent performance, and is equipped with an advanced intelligent digital display, which can directly input the mass or material density of the hot fluid.
Working principle of thermal mass flow meter: If the medium being tested is high-temperature, high-pressure, or highly corrosive, high-temperature materials should be used. When using this type of flow meter, care should be taken to prevent pipe blockage and scaling. When organic vapor undergoes a phase change in the tested medium, the liquid itself cannot withstand the drastic changes in pressure and temperature, so a negative pressure area proportional to atmospheric pressure will be generated. In this way, a vacuum state will appear here, generating a certain static pressure in the transmission component (called the diffusion tube), converting the total mass of this distance into a displacement amount in the form of density and velocity. Its value can be displayed directly, or it can be automatically recorded and output through devices such as digital integrators and printing recorders. The thermal mass flow meter is one of the most advanced high-precision flow monitoring devices currently available.
Thermal Mass Flow Meter It consists of a sensor and a transmitter. There are two types of sensors: insertion type and straight-through type. When the process pipe diameter is small, a straight-through type is generally selected; while when measuring a large diameter, an insertion type is generally selected. It is based on French measuring instruments, with stable accuracy and simple installation. It is suitable for high-temperature, corrosive, and non-conductive media, and is also widely used in the chemical, petroleum, and metallurgical industries for measuring the flow rate and pressure of gaseous or vapor media. The functional characteristics of the thermal mass flow meter are wide measurement range, high accuracy, simple structure, reliability, and durability.
Thermal mass flow meters are suitable for measuring various pipes, from capillaries to large-diameter and square pipes. Pipes with diameters up to 9m can be measured. Its frequency range is very wide, some can reach 1000:1; the pressure loss is very small and can be ignored. The parts of the flow meter that come into contact with the medium can be made of various materials, such as stainless steel, Hastelloy, Monel, etc. Therefore, it is corrosion-resistant. The temperature measurement range is wide, and the pressure resistance is strong, such as the liquid temperature can reach 200℃, and the gas temperature can reach 850℃. It is especially suitable for measuring high-temperature flue gas, and the pressure resistance can reach 70MPa. The overload capacity is also very strong, and when the actual flow rate is higher than the full-scale flow rate range, it will not cause any damage to the instrument. Thermal Mass Flow Meter When used for low flow rate measurement, it can be used for occasions with a flow rate of 20ml/d. When used for high-speed gas flow measurement, the gas flow rate can be as high as 480m/s, which can avoid wear, breakage, and fatigue cracks caused by rotation, movement, or vibration. The measurement accuracy can generally reach 1% of the reading, and the repeatability is 0.5% of the reading. Optional instantaneous flow or cumulative flow display, with high and low alarm contact output.
More News
Tel: 400 006 6550
Office Address: 12F, Building I, International Innovation Park,
177 Songling Road, Laoshan District, Qingdao, Shandong, China