Electronic Temperature Compensated Rotameter

Abstract

The invention relates to an electron temperature compensated float flowmeter, which comprises a flow pipe with a conical pipe cavity, a first guide rod arranged by penetrating the flow pipe, a float arranged in the conical pipe cavity of the flow pipe, a displacement sensor, a temperature sensor and a microprocessor, wherein the float is fixedly sleeved on the first guide rod; the displacement sensor and the temperature sensor respectively output a displacement signal and a temperature signal to the microprocessor. Fluid body flows through the conical pipe cavity of the flow pipe to push the float to move up and down with the first guide rod; the displacement sensor converts the measured displacement quantity into an electric signal to input to the microprocessor, meanwhile, the temperature sensor senses the environment temperature and inputs the temperature electric signal to the microprocessor; and the microprocessor modifies the displacement signal according to the temperature signal. Compared with the flow signal obtained by the unmodified displacement signal, the flow signal obtained according to the modified electric signal has a higher accuracy.

Description

technical field [0001] The invention relates to a float flowmeter, in particular to an electronic temperature-compensated float flowmeter capable of correcting the temperature-induced data error of the float flowmeter and improving the measurement accuracy of the float flowmeter. Background technique [0002] Rotameter, also known as constant pressure drop variable area flowmeter, usually has an upright tapered tube and a float that can freely float up and down with the flow rate. When the fluid flows through the tapered tube from bottom to top , the thrust generated by the kinetic energy of the fluid on the float and the buoyancy of the fluid make the float rise. As the annular flow area between the inner wall of the conical tube and the float increases, the thrust generated by the kinetic energy of the fluid on the float decreases accordingly. When the thrust and buoyancy When the sum is equal to the gravity of the float itself, that is, when the flow annulus area between ...

AI Technical Summary

Problems solved by technology

The core component of the HMC1501 angular displacement sensor, the HMC1501 angular displacement chip, is made of permalloy iron-containing material. The material constant will change with temperature, thus affecting the sensitivity and bias of the bridge. Based on the HMC1501 angular displacement For the rotameter of the sensor, the maximum error caused by temperature is 2% to 5%, while the measurement accuracy of the rotameter is 1.5% to 2.5%, so the rotameter based on the HMC1501 angular displacement sensor is very sensitive to temperature. In the case of large changes in ambient temperature, the measurement accuracy requirements cannot be met, which leads to a large error in the output data of the remote type rotameter when used on site due to changes in the ambient temperature.

Images