Search Results for: Pressure switch

Direct level measuring techniques

Introduction There are several methods to measure the level.There are Direct and Indirect methods.example for Indirect methods are  Ultrasonic Level Switches ,Interface Level Measurement ,Radiation level measurement techniques etc .in this session we are gonna discuss about some of the Direct level measuring techniques Simple Sight Glasses A visual indication of the level can be obtained when part …

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Distributed Control System (DCS) basics

 Concept of Distributed Control System: DCS refers to a control system usually of a manufacturing system, process or any kind of dynamic system. In DCS controllers are not central in location, but which are distributed throughout the system with each component sub-system controlled by one or more controllers. The entire system is connected by a communication network …

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What are pneumatic controllers ?

 Introduction A controller is a device that senses differences between a desired condition and measured condition in a process. .The controller will reduce this difference with the help of final control elements in the process.If the final control element is control valve the controller will send signal to open or close the valve to reduce …

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PROGRAMMING LOGIC DEVICES (PLC)

Introduction A digitally operating electronic apparatus which uses a programming memory for the internal storage of instructions for implementing specific functions such as logic, sequencing, timing, counting and arithmetic to control through digital or analog modules, various types of machines or process.In this session we are gonna discuss about basics of programming logic devices (PLC) …

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Calibration of P/I converter.

Introduction Pressure to current (P/I) converters are  two-wire precision instrument designed to convert standard pneumatic input signals into proportional output electrical signal. They are compact robust instruments suitable for panel or field mounting applications.In this session we are going to discuss the calibration of P/I converter.  Input signal: 3-15 psig.  Output signal: 4-20 mA  DC …

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Displacer type level transmitter calibration / Leveltroll Calibration

Introduction Leveltroll is a combination of torque chamber, torque arm, torque tube, displacer and with this mechanism we can measure the level.A Leveltroll in and instrument used for measuring the liquid level between two known points. The Leveltroll works on the buoyancy principal. Leveltroll has a float, which submerses proportionately with liquid level raise in …

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Common Control Loops

  Common Control Loop  1.Flow   Liquid flow processes are fast,  typically 0.5 sec response or less. Gas flow is slightly slower because of the compressibility of the gas. Control components – transmitter, valve and transmission lines –  are the main dynamic elements.  The most common measuring means is the orifice plate and differential pressure …

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