Classification diagram of automation instruments

What is an automated instrument? What are the classifications of automation instruments? Automated instruments can be divided into six categories: field measurement instruments, field control instruments, field instrument actuators, display and recording instruments, adjustment control instruments, and special measurement instruments, each of which can be subdivided into several subcategories. Definition The automation instrument is composed of several automation components and has a relatively complete function of automation technology tools. Automated instruments generally have several functions such as measurement, display, recording or measurement, control, and alarm. The origin of automated instruments The real appearance of automated instruments was in the 1980s. People effectively combined automation technology with industrial instruments through a control device, and then performed comprehensive control through assembled electronic equipment. Later, with the control technology With the continuous development of industrial instruments, automation technology has gradually become the main tool for the development of industrial instruments, and real automated instruments have appeared. The rapidly developing new technologies such as microelectronics technology, computer technology, network communication technology and information processing technology have had a profound impact on the innovation of automation instruments, and have become a new driving force for the development of industrial automation instruments, enabling industrial automation instruments not only to improve High-speed, more sensitive, more reliable and simpler to obtain all-round information of objects, and completely break through the traditional framework of light, machine and electricity, and develop in the direction of intelligence, network, bus and openness. Automated instrument classification Automated instruments can be divided into six categories: field measurement instruments, field control instruments, field instrument actuators, display and recording instruments, adjustment control instruments, and special measurement instruments, each of which can be subdivided into several subcategories. 1. On-site measuring instruments On-site measuring instruments are installed at industrial production sites. On-site measuring instruments can be divided into level instruments, pressure instruments, temperature instruments, flow instruments, gas analysis instruments, and liquid analysis instruments. 1. Level meter Level meter is an instrument that measures liquid level, solid and powder accumulation height, and liquid-liquid phase, liquid-solid interface position in the industrial production process. There are two types of level instruments: continuous measurement and intermittent measurement: continuous level instrument and limit type level instrument. ①Continuous level meter Continuous level meter can be further subdivided into: direct-reading level meter (to measure the liquid level according to the principle of fluid connectivity. Such as: glass plate level meter, glass level meter, quartz tube Two-color level gauge), capacitive level gauge, buoyancy level gauge (such as: magnetostrictive level gauge, fiber optic level gauge, float level gauge, servo level gauge, float steel belt level gauge, float level gauge ball level gauge, magnetic flap level gauge), laser level gauge, ultrasonic level gauge, radar level gauge (such as: pulse radar level gauge, guided wave radar level gauge), external sticker level gauge Meter, radio frequency level meter, differential pressure level meter, weight level meter Type liquid level switch, tuning fork level switch, rotary vane level switch, ultrasonic level switch. 2. Pressure instrument Pressure instrument is an instrument that measures the change of medium pressure or pressure difference in the process of industrial production. Pressure instruments can be divided into liquid column pressure gauges (such as U-tube pressure gauges, single-tube pressure gauges, tilt pressure gauges,), pressure transmitters, differential pressure transmitters, pressure sensors, pressure gauges, pressure switches, glass tube liquid. 3. Temperature instrument Temperature instrument is an industrial automation instrument that measures the degree of cold and heat of objects. Temperature instruments can be subdivided into glass tube liquid thermometers, pressure thermometers, thermocouples, thermal resistances, temperature transmitters, bimetal thermometers, temperature switches, optical high thermometers, radiation pyrometers, and non-contact infrared thermometers. 4. Flow meter Flow meter, also known as flow meter, can be subdivided into mass flow meters (such as Coriolis force mass flow meters, thermal mass flow meters), positive displacement flow meters (scraper flow meters, waist wheel flow meters) meter, oval gear flowmeter), flushing plate flowmeter, flow switch, velocity flowmeter (such as: rotor flowmeter, turbine flowmeter, ultrasonic flowmeter, electromagnetic flowmeter, vortex flowmeter), open channel flowmeter, Target flowmeter, differential pressure flowmeter (such as: orifice flowmeter, nozzle flowmeter, Venturi tube flowmeter, elbow flowmeter, V cone flowmeter, pitot tube flowmeter, uniform tube flowmeter) .5. Gas analysis instrument Gas analysis instrument is a process analysis instrument for measuring gas composition.It can be subdivided into gas chromatography/mass analyzers, oxygen analyzers, toxic/flammable gas detection instruments, thermal conductivity analyzers, magnetic permeability analyzers, electrochemical analyzers, infrared analyzers, ultraviolet analyzers, laser gas analysis instrument, photoelectric detection gas analyzer. 6. Liquid analysis instruments Liquid analysis instruments can be subdivided into electrochemical analyzers, UV-visible light analyzers, infrared absorption spectrum analyzers, distillation range analyzers, liquid chromatography/mass spectrometers, water quality analyzers (such as: pH meter, conductivity instrument, concentration/turbidity meter, dissolved oxygen analyzer, residual chlorine analyzer, DOC/COD analyzer), viscosity/density meter. 2. Field control instrument Field instrument refers to the instrument installed on the production site to measure various process parameters, execute various control commands or convert signals and realize communication. Field control instruments include pneumatic control instruments, hydraulic control instruments and electric control instruments. 3. Field Instrument Actuator Field instrument actuators are divided into pneumatic diaphragm control valve, pneumatic diaphragm control valve used in conjunction with valve positioner, electric valve positioner, and intelligent electric valve positioner.
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