Floating ball flowmeter| Yangquan Sewage Flow Meter Manufacturer

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1. Knowledge | | Common classification and working principle of instruments

Common classification and working principle of instruments

1. Common classification of instruments According to their different detection and measurement functions, instruments can be divided into the following categories: temperature detection instruments: used for measuring and displaying temperature. Flow detection instrument: used to measure the flow rate of fluid in pipelines. Liquid level detection instrument: used to measure the height or level of liquid in a container. Pressure detection instrument: used to measure the pressure of fluid or gas on the container wall.

2. Working principle of the instrument Temperature detection instrument Expansion type: Based on the principle of thermal expansion and contraction of objects, the temperature is calculated by measuring the amount of expansion of the object.

. Thermistor: Using the characteristic of the resistance of a metal conductor changing with temperature to measure temperature. Thermocouple: Based on the Seebeck effect, the temperature is calculated by measuring the thermoelectric potential generated by two different metals under a temperature gradient. Radiation type: Temperature is calculated by measuring the infrared energy radiated by an object, suitable for high-temperature measurement. Pressure detection instrument strain gauge: uses strain gauges to deform under pressure, thereby changing the resistance value to measure pressure. Circular disturbance Hall effect: using the Hall effect to calculate pressure by measuring the changes in current carried by the magnetic field cavity. Inductive type: using the self inductance or mutual inductance changes gener Floating ball flowmeter

ated by an inductive coil under pressure to measure pressure. Piezoelectric type: using piezoelectric materials to generate charges under pressure to measure pressure. Piezoresistive: Measuring pressure by utilizing the characteristic of semiconductor materials that undergo changes in resistance under pressure. Capacitive: Measuring pressure by utilizing changes in the distance or area between capacitor plates under pressure. Flow detection instrument throttling flowmeter: Based on the law of conservation of energy and the law of fluid flow continuity, the flow rate is calculated by measuring the pressure difference before and after the throttling device. Positive displacement flowmeter: It calculates the flow rate by measuring the number of times a fluid flows through a fixed volume within a certain period of time. Fluid vibration flowmeter: measures flow rate by utilizing the vibration generated by fluid flow in pipelines. Electromagnetic flowmeter: Based on Faradays principle of electromagnetic induction, the flow rate is calculated by measuring the induced potential of a conductive liquid flowing in a magnetic field. Ultrasonic flowmeter: uses the relationship between the speed of ultrasonic waves propagating in a fluid and the fluid velocity to measure flow rate. Mass flow meters, such as Coriolis mass flow meters, use the Coriolis force generated by fluids in a rotating system to directly measure mass flow. Liquid level detection instruments with constant buoyancy, such as float ball type, magnetic flap, float steel strip, etc., measure liquid level through the principle of buoyancy. Variable buoyancy type: such as a float level gauge, which measures the liquid level based on the principle that buoyancy changes wit

Floating ball flowmeter

1. Knowledge | | Common classification and working principle of instruments

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