Process Control Communucation Protocols

How do instruments and controllers communicate in a process control? Has it ever came in your mind how instruments and controllers communicate? We know for a fact that communication may come wired or wireless but with the wast variety of process instruments nowadays how do this instruments work when connected to controllers of a different make. Communication protocols is what we call the digital message formats and rules required to exchange messages in or between computers and instruments. This is required in process automation.   The following are the different types of communication protocols, its uses and its makers in the field of […]

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Typical setup for a 3/4 way 2 position way valve

How to setup a 3/4 way 2 position way valve?   1. To actuate one single-acting cylinder. Either oil port “A” or “B” must be plugged on valve. With port “B” plugged, solenoid is energized to position “A,” oil port “A” becomes pressurized. When solenoid is energized to position “B,” oil port “A” becomes the return port. 2. To actuate two single-acting cylinder. A pressure line from one bank can be connected to oil port “A” and the other to oil port “B” on the valve. Sequence: When energized to position “A,” oil port “A” becomes pressurized and clamps the fixture […]

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Direct Operated 3/2 Way Solenoid Valves

A 3/2 way solenoid valve has three ports and two switching states. In each switching state, two of the three ports are connected. By activating the solenoid, the valve switches state and a different connection between the valve ports is established.   3/2 Way Direct Acting solenoid valves utilizes the armature movement as the direct means to the Open / Close the inlet or exhaust ports of the solenoid valve. 3/2 way normally closed solenoid valve Inlet pressure is typically through P1, so when the solenoid valve de-energized the inlet port P1 is closed i.e. the armature is down and sealing […]

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Temperature Measurement

Introduction Temperature measurement is one of the significant functions in the field of measurement, which has been most frequently conducted in meteorological observation, environmental research, laboratories, and various other production processes. Temperature measurement is fundamental and important in terms of manufacturing products in a specified condition and maintaining consistent quality in the industry. Therefore, this describes the measurement principles of the thermocouples and resistance temperature detectors (RTD) in temperature sensors most often used in temperature measurements carried out by the field of industry.   1. What are Thermocouples? Thermocouples are temperature sensors. They operate under the principle that the junction […]

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RTD vs Thermocouple

Resistance temperature detectors (RTDs) An RTD sensing element consists of a wire coil or deposited film of pure metal. The element’s resistance increases with temperature in a known and repeatable manner. RTDs exhibit excellent accuracy over a wide temperature range and represent the fastest growing segment among industrial temperature sensors. Their advantages include: Temperature range: Minco models cover temperatures from ¬260 to 850°C (¬436 to 1582°F). Repeatability and stability: The platinum resistance thermometer is the primary interpolation instrument used by the National Institute of Standards and Technology from ¬260 to 962°C. Ordinary industrial RTDs typically drift less than 0.1°C/year. Sensitivity: […]

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