How to judge the excellent performance of thermal gas mass flowmeter

Thermal gas mass flowmeter products must have two main features: 1. Excellent probe manufacturing process, 2. Complete real-flow calibration device. We analyze these two characteristics: Probe manufacturing process: The probe is the core of the entire thermal gas mass flowmeter, and its performance can determine the measurement accuracy, repeatability, service life, and low flow rate characteristics of the flowmeter. The probe is composed of platinum resistance wire and sheathed stainless steel. Platinum resistance conducts electricity, and the stainless steel sheath also conducts electricity, which requires that the thermal conductivity between the two must be very good, but not conductive. This leads to the core of all thermal flowmeters - heating probe and packaging process: the thermal gas mass flowmeter produced by FCI company in the United States adopts two strict screening, the parameters are consistent and have a protective sleeve Platinum thermal resistance (RTD) is used as the basic measurement element. The RTD probe rod is connected by full welding. The fine processing and welding will not cause air holes and virtual welding. At the same time, it can truly prevent clogging and is durable. Real-flow calibration technology: To judge the pros and cons of thermal gas mass flowmeters, real-flow calibration technology is extremely important, because the thermal conductivity of the gas medium measured by the thermal gas mass flowmeter is different, and the specific heat capacity of each gas medium is in The values ​​are different for different temperatures and pressures. It is inaccurate to measure the flow value by simply relying on normal pressure or negative pressure air calibration and then correcting it. Facts have proved that the flowmeter without actual flow calibration measures the non-air medium, and the data deviation is very large. At present, most thermal gas mass flowmeters on the market are calibrated with negative pressure air, and then corrected to high pressure conditions, or corrected to other gases, such as methane (natural gas), hydrogen, helium, argon, etc. Calibration correction will inevitably lead to measurement accuracy cannot be guaranteed, and the meter calibrated for air medium is applied to other gas media, and the measurement accuracy cannot be guaranteed.

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