What are the classifications of instruments?

Instruments can be divided into several categories, as follows: 1. According to the power source, they are divided into: electric instruments (electronic instruments), pneumatic instruments, hydraulic instruments, etc.

2. Divided by function: detection (sensing, conversion, transmission) instruments, control (operation, adjustment) instruments (including display instruments), actuator instruments (including actuators and regulating valves) (power regulators, frequency converters)

Utensils can also be classified here).

3. According to physical quantities: (electricity, magnetism) electrical instruments (electromagnetic quantities such as voltage, current, resistance, power, power factor, inductance, capacitance, and magnetic field strength and flux); chemical optical instruments (including acidity, viscosity, heat

, photoelectric, illumination, laser, optical fiber, etc.); nuclear (radiation) instruments; radio, electronic instruments; length instruments (measuring instruments) (including angles, smoothness, etc.); time measurement instruments (timing, including frequency, etc.), thermal engineering (

Quantity) instruments (temperature, pressure, flow, material level including liquid level, component analysis, etc.), mechanics (force, mass, weight, hardness, etc.) instruments (electronic scale, track scale, belt scale, etc.), others such as poisonous gas

, explosive hazardous gas content detection, etc., as well as image analysis formulas, etc.

4. According to the principle: just take the flow meter as an example, there are volumetric type, speed type (including rotor type water meter, turbine, etc.), force type (target type), differential pressure type (including orifice plate, multi-hole orifice plate, average speed)

tube, nozzle, Venturi tube, rotor type, rotor, elbow, etc.), thermal type, ultrasonic type, Coriolis type, vortex (vortex), electromagnetic flow meter, etc.

There are many other quantities.

5. Divided by industry use: standard measurement (value transfer) instruments, scientific experimental instruments, teaching instruments, aerospace instruments, automotive instruments, mining instruments, industrial instruments, business instruments, etc.

6. Others: Sometimes DCS, PLC, etc. are also included in the instrument category.