Thermal flowmeter and method of flow rate correction
A technology of thermal flowmeter and correction method, which is applied in the direction of measuring flow/mass flow, indirect mass flowmeter, mass flow measuring device, etc., and can solve problems such as flow output error of thermal flowmeter
Active Publication Date: 2020-09-11
YAMATAKE HONEYWELL CO LTD
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- Application Information
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Problems solved by technology
according to Figure 24 It can be seen that when the type of fluid changes after setting, the flow output of the thermal flowmeter will produce errors
Method used
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Embodiment
[0076]Hereinafter, examples of the present invention will be described. Figure 16 It is a block diagram showing the configuration of a thermal flowmeter according to an embodiment of the present invention. The thermal flowmeter includes: a pipe 1, which is made of glass, for example, through which the fluid to be measured flows; a temperature measuring element 2a, which is arranged on the pipe 1, and is made of, for example, platinum; The position of the piping 1 on the downstream side of the temperature measuring element 2a is, for example, platinum or the like; adhesives 3a, 3b, which fix the temperature measuring element 2a and the heating / temperature measuring element 2b on the piping 1; the temperature acquisition part 4a, It acquires the temperature TRr of the fluid detected by the temperature measuring element 2a; the temperature acquiring part 4b acquires the temperature TRh of the fluid detected by the heating / temperature measuring element 2b; the control calculation...
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Provided are a thermal flowmeter and a flow rate correction method, capable of measuring a flow rate with high precision even if the type of fluid distribution in a pipe changes. The thermal flowmeterincludes a tube, a temperature measuring device disposed on the tube and detecting a first temperature of a fluid, a heating and temperature measuring device disposed on the tube and detecting a second temperature of the fluid, a controller causing the heating and temperature measuring device to generate heat, a power determining unit determining a power consumption of the heating and temperaturemeasuring device, a flow rate obtaining unit converting the power consumption into a flow rate, a flow rate correcting unit correcting the flow rate, a memory unit storing a first zero-point power consumption, a zero-point power ratio calculating unit calculating a zero-point power ratio based on the first zero-point power consumption and a second zero-point power consumption, and a setting unitcalculating a correction factor based on the zero-point power ratio and setting the correction factor in the flow rate correcting unit.
Description
technical field [0001] The present invention relates to a thermal flowmeter which measures the temperature of a fluid at two points upstream and downstream of a pipe, and controls a heater so that the temperature difference between the two points becomes a specified value, thereby according to the power applied to the heater Calculate the flow rate of the fluid. Background technique [0002] Thermal flowmeters generally adopt the following method: make the heater temperature relative to the water temperature at a certain temperature such as plus 10°C to operate by heating and driving, and calculate the flow rate based on the temperature difference between the upstream and downstream or the power of the heater. It is known that the sensor output changes according to physical property values such as thermal conductivity, specific heat, density, and viscosity of the fluid (see Patent Document 1). [0003] Figure 21 It is a diagram explaining the principle of a thermal flowm...
Claims
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IPC IPC(8): G01F1/684G01F1/696
CPCG01F1/684G01F1/6965G01F1/6847G01F25/10G01K13/02G01F1/698G01F1/86G01F1/699
Inventor 山崎吉夫
Owner YAMATAKE HONEYWELL CO LTD