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Listed on Sep 18,2018
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Flow measurement has a history of about 3000 years. It has been studied only in the last 200 years and in the last 30 years all the new techniques have evolved. There is now a wide variety of methods available to measure the flow of liquids, solids, gases and vapours. There are three different flow quantities to be measured :- The actual ...
Listed on Sep 18,2018
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Ball Valve Ball valve is a quarter turn operated valve. The closure member is a spherical plug with a through hole. When the valve is in open state, the through hole is in-line with the fluid flow and hence, the fluid passes through it. The valve is closed by rotating the globe by 90 Deg. such that the hole now becomes perpendicular to the flo...
Listed on Sep 11,2018
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Most instrument manuals state there is no calibration of the temperature sensor, but the temperature sensor must be checked to determine its accuracy. This accuracy check is performed at least once per year and the accuracy check date/information is kept with the instrument. If the accuracy check date/information is not included with the instr...
Listed on Sep 11,2018
By admin
The turbidity method is based upon a comparison of intensity of light scattered by a sample under defined conditions with the intensity of light scattered by a standard reference suspension. A turbidimeter is a nephelometer with a visible light source for illuminating the sample and one or more photo-electric detectors placed ninety degrees to the ...
Listed on Aug 28,2018
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A major portion of all industrial measurement relates in some way to pressure in its several forms. Flow, for example, is often measured by determining the pressure that exists at two different points in a system. In a Bourdon system, pressure changes are used to produce the mechanical motion of a recording stylus. Pressure can also be used to...
Listed on Aug 28,2018
By admin
Wind chill is a phenomenon common to anyone who has ever lived in a cold environment. When the ambient air temperature is substantially colder than the temperature of your body, heat will transfer from your body to the surrounding air. If there is no breeze to move air past your body, the air molecules immediately surrounding your body will begin t...
Listed on Aug 20,2018
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Differential pressure sensors are common in the process industry and cover a variety of applications. To understand what a differential pressure sensor is, it becomes important to put it in contrast to other pressure measurement types. The most common types of pressure measurement are absolute, gauge and differential. Gauge Pressure: Gauge pre...
Listed on Aug 20,2018
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Measurement principle Continuous non‐contacting ultrasonic level measurement is based on the time of flight principle. An ultrasonic level instrument measures the time between sound energy transmitter from the sensor, to the surface of the measured material and the echo returning to the sensor. As the speed of sound is known through the ...
Listed on Aug 13,2018
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An ultrasonic switch is a device that uses inaudible high-frequency sound (ultrasound) to detect the presence or absence of a liquid at a designated point. The device consists of an electronic control unit and a sensor. Ultrasonic level switches use the properties of sound transmission in vapor and liquids to detect liquid level. When sound travels...
Listed on Aug 13,2018
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Pneumatic actuators are normally used to control processes requiring quick and accurate response, as they do not require a large amount of motive force. However, when a large amount of force is required to operate a valve (for example, the main steam system valves), hydraulic actuators are normally used. Although hydraulic actuators come in many de...
Listed on Aug 03,2018
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when an elastic transducer ( bourdon tube in this case ) is subjected to a pressure, it defects. This deflection is proportional to the applied pressure when calibrated. Description of Bourdon tube Pressure Gauge The main parts of this instruments are as follows: An elastic transducer, that is bourdon tube which is fixed and open at ...
Listed on Aug 03,2018
By admin
One of the most popular styles of single-fiber connector is the so-called “ST” style, which uses a quarter-turn locking barrel to secure the connector into its matching socket: Communication patch cables such as the one shown above come in pairs of fibers, one for receiving and one for transmitting. Note how the plastic strain-relief grips bet...
Listed on Jul 24,2018
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The location of the RTD (thermowell), positioned downstream of the orifice plate so the turbulence it generates will not create additional turbulence at the orifice plate. The American Gas Association (AGA) allows for upstream placement of the thermowell, but only if located at least three feet upstream of a flow conditioner. A major reason fo...
Listed on Jul 24,2018
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Firstly, I need to clarify, that a DP transmitter is not only used for measuring flow, as the user referred to in his question, to a DP flow transmitter. A differential pressure transmitter (or DP cell) literally measures any differential pressure across its High and Low pressure measuring ports, and provides an output proportional to the diff...
Listed on Jul 18,2018
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What is the working principle of a pressure sensor? A pressure sensor works by converting pressure into an analogue electrical signal. The demand for pressure measuring instruments increased during the steam age. When pressure sensing technologies were first manufactured they were mechanical and used Bourdon tube gauges to move a needle and gi...
Listed on Jul 18,2018
By admin
A Solenoid valve is used wherever fluid flow has to be controlled automatically. They are being used to an increasing degree in the most varied types of plants and equipment. The variety of different designs which are available enables a valve to be selected to specifically suit the application in question. How is a solenoid operated valve bei...
Listed on Jul 18,2018
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There are two key issues currently affecting the actuation industry: host system integration and functional safety. Host system integration In any plant installation, a key requirement is being able to smoothly integrate the actuators used for opening or closing valves with the plant’s automation system. While the mechanical interface between...
Listed on Jul 18,2018
By admin
A gear motor is a specific type of electrical motor that is designed to produce high torque while maintaining a low horsepower, or low speed, motor output. Gear motors can be found in many different applications, and are probably used in many devices in your home. Gear motors are commonly used in devices such as can openers, garage door opener...
Listed on Jul 03,2018
By admin
Solenoid valves are used to control the rate of flow in fluid and air powered tools, systems, and motors. Washing machines and gas boilers use these valves, as well as hydraulic pumps and air hammers because they are diverse enough to perform both simple and complex tasks with ease. Solenoid valves can be customized to suit specific needs and can b...
Listed on Jun 26,2018
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Loop calibrators are a type of electrical calibrator specifically designed to troubleshoot 4-20 mA current loops. These versatile instruments are capable of measuring current, sourcing current to unpowered devices in a loop, as well as simulating the operation of loop-powered 4-20 mA transmitters. An analog current loop is an electrical signal...
Listed on Jun 26,2018
By admin
Incremental or Absolute? Positioning tasks require precise position values to monitor or control motion activity. In many applications position sensing is done using rotary encoders, also called shaft encoders or simply encoders. These sensors transform a mechanical angular position of a shaft or axle into an electronic signal that can be processe...
Listed on Jun 19,2018
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Slice valves operate with a sliding gate that slices through the water flow. The operator pushes a plunger-type handle that pushes the gate through the opening. This gate fits into the flanges within the frame of the valve that form seals preventing the flow of liquid through the valve. The device is sometimes called a gate valve for its design fea...
Listed on Jun 19,2018
By admin
It’s all about revolution. Digital tachometers, and all tachometers, measure the revolutions of a spinning object to determine the rate at which it is spinning. Nearly all types of transportation vehicles, from planes to trucks to buses to trains to cars have tachometers. The instrument is also vital in troubleshooting machinery performance and con...
Listed on Jun 05,2018
By admin
Valves are one of those critical inventions that go unnoticed by many. They play an important role in our world by controlling, regulating, guiding and directing the flow of assorted types of liquids, gases, steam or flowing materials such as mill, grain, etc. Valves are made of steel, iron, steel, bronze or PVC and can handle high temperature...
Listed on Jun 05,2018
By admin
A linear actuator moves a load, which can be an assembly, components, or a finished product, in a straight line. It converts energy into a motion or force and can be powered by pressurized fluid or air, as well as electricity. Here is a breakdown of common linear actuators, their advantages and their disadvantages. How They Work • Pn...
Listed on May 31,2018
By admin
Diaphragm seals are protective devices designed to isolate pressure gauges, pressure transmitters, and pressure switches from potentially damaging process media. Typical applications where a diaphragm seal provides a cost effective solution to protecting the pressure instrument are: In applications where the process fluid is corrosive In ...
Listed on May 31,2018
By admin
What is a relay? We know that most of the high end industrial application devices have relays for their effective working. Relays are simple switches which are operated both electrically and mechanically. Relays consist of a n electromagnet and also a set of contacts. The switching mechanism is carried out with the help of the electromagnet. There...
Listed on May 28,2018
By admin
A pneumatic air volume booster reproduce a low flow control signal with a higher regulated flow output pressure. It uses an unregulated input pressure to maintain a regulated output pressure under flowing and non-flowing conditions. The volume booster is connected to the supply line and the output plumbing. It receives a pneumatic control sign...
Listed on May 22,2018
By admin
Self actuated pressure control valves do not depend on any external signal for pressure control. As the name suggests, pressure in the process line itself is used as an actuating signal to open or close the pressure control valve. A self actuated pressure control valve can be used to control the pressure at either upstream or downstream of the...
Listed on May 22,2018
By admin
A soft starter is any device which controls the acceleration of an electric motor by means of controlling the applied voltage. Now let us have a brief recall of the need for having a starter for any motor. An Induction motor has the ability to self start owing to the interaction between the rotating magnetic field flux and the rotor windi...
Listed on May 14,2018
By admin
The TS-3 temperature sensor provides an input signal for temperature compensation of specific Siemens ultrasonic level controllers. Temperature compensation is essential in applications where temperature variations of the sound medium are expected. By installing the temperature sensor close to the sound path of the associated ultrasonic t...
Listed on May 11,2018
By admin
Transmitters are used in the process industry environments to measure pressure and other parameters. The plant operators rely upon these devices for accurate measurements and process optimization. The performance of these transmitters may weaken with time due to several factors. This is when they need calibration. During calibration, a compari...
Listed on May 11,2018
By admin
In part one of this instrumentation and control (I & C) series, we'll go over the fundamental terminology and concepts used when working with industrial plants. This is the first of a series of technical articles about instrumentation and control. In this series, we will discuss the basic concepts and principles that govern the operation of in...
Listed on Apr 30,2018
By admin
There is nothing like a good old-fashioned competition to keep things interesting. In the level measurement world, that rivalry is between the two most commonly used measurement instruments: ultrasonic, which uses sound-based measurement, and radar, which uses high-frequency electromagnetic waves to determine distance. Both ultrasonic and radar lev...
Listed on Apr 30,2018
By admin
Signal isolators provide electrical (galvanic) isolation between the input and output circuits. They couple the signal to the output through a transformer or optical isolator. Signal isolators also break the direct electrical galvanic path between two or more loop points. They protect against dangerous measured-variable voltages and increase protec...
Listed on Apr 25,2018
By admin
Pressure is the second most common process measurement, after temperature, in industrial and commercial applications. Even around the house, when inflating a tire or checking the status of a boiler system, accurately and immediately knowing the pressure is of importance. Pressure gauges are the simplest, most direct way of measuring and displaying ...
Listed on Apr 23,2018
By admin
Pressure Transmitters Pressure Transmitters, a sub-group of pressure transducers, feature additional reset and calibration options. With some sensor types it is possible, for example, to re-set the measuring span over large ranges. This calibration option is usually referred to by such terms as “scale down”, “span reset” or “turn down”. For instan...
Listed on Apr 16,2018
By admin
What is calibration? Calibration is a comparison between a known measurement (the standard) and the measurement using your instrument. Typically, the accuracy of the standard should be ten times the accuracy of the measuring device being tested. However, accuracy ratio of 3:1 is acceptable by most standards organizations. Calibration of your ...
Listed on Apr 16,2018
By admin
The worldwide accepted measure for analog signals inwards the measure manufacture is the iv to 20mA signal. One key drawback of this signal measure is that it tin entirely transmit i parameter or measured value. Influenza A virus subtype H5N1 two-way or bidirectional communication protocol, which addresses this drawback, has been developed amo...
Listed on Apr 03,2018
By admin
Incremental encoder (encoder type selection) is the displacement into periodic electrical signal, then change the electrical signals into counting pulses, pulse number indicate the size of the displacement. Incremental encoder works: Uniform grating engraved on the shaft to rotate together with the pulse encoder on the code disk evenly di...
Listed on Apr 03,2018
By admin
Pressure gauges measure the increase and reduction of pressure in a contained field. The earliest patent for a tube pressure gauge was issued to France's Eugene Bourdon in 1849. Still in use in the twenty-first century, the popular Bourdon pressure gauge measures different kinds of liquids and gases including steam, water and air. The coiled tube c...
Listed on Mar 27,2018
By admin
A magnetic flow meter (mag flowmeter) is a volumetric flow meter which does not have any moving parts and is ideal for wastewater applications or any dirty liquid which is conductive or water based. Magnetic flowmeters will generally not work with hydrocarbons, distilled water and many non-aqueous solutions). Magnetic flowmeters are also ideal for ...
Listed on Mar 20,2018
By admin
What is a Temperature Transmitter? The thermocouple or RTD signal is converted to a 4 - 20 mA output signal using a temperature transmitter, which is considered to be the ideal solution for a number of remote temperature measurement applications. In comparison to conventional temperature measuring devices, temperature transmitters have definite ad...
Listed on Mar 15,2018
By admin
Applications Calibration service companies/service industry Quality assurance Recording and monitoring of pressure processes Measurement of pressure peaks Special Features Recording interval can be set from 1 ms ... 10 s Measuring ranges from 0 ... 25 mbar to 0 ... 1,000 bar (0 ... 0.4 psi to 0 ... 14.500 psi) Accuracy: 0.2 %, optional ...
Listed on Mar 12,2018
By admin
The WirelessHART adapter is a communications component which integrates different field devices in a WirelessHART network. The field devices will be connected via HART or 4 … 20 mA. The adapter supports the standard WirelessHART protocol. Input: One-device input channel One point-to-point connection with a HART device or a 4...20 mA device ...
Listed on Mar 09,2018
By admin
Pressure regulator A pressure regulator is a control valve that reduces the input pressure of a fluid to a desired value at its output. Regulators are used for gases and liquids, and can be an integral device with an output pressure setting, a restrictor and a sensor all in the one body, or consist of a separate pressure sensor, controller and flo...
Listed on Dec 29,2017
By Admin
Pressure is the second most common process measurement, after temperature, in industrial and commercial applications. Even around the house, when inflating a tire or checking the status of a boiler system, accurately and immediately knowing the pressure is of importance. Pressure gauges are the simplest, most direct way of measuring and displaying ...
Listed on Dec 15,2017
By Admin
Conductivity controllers are used to monitor and control conductivity in process water or wastewater. Exceptional capabilities of the Conductivity controllers:- These are Programmable wide measurement range These devices are computerized temperature repayment Set factors on the front panel Huge vibrant red LED display screen Twin h...
Listed on Dec 08,2017
By Admin
Geared Motors Helical geared automobiles are the conventional answer for your pressure software. Helical tools devices are coaxial units where the gear unit output shaft is in-line with the motor shaft. A solid shaft is always used as the output shaft. Additional additives – e.g. tools wheels or chain wheels to transfer the force to the driven loa...
Listed on Nov 17,2017
By Admin
The SE model contact pressures with electric alarm contacts are suitable for controlling or regulating process sequences. The contact opens and closes electric circuits when it comes to the location of the pointer at the strain gauge. Our touch strain gauges with bourdon tube system are used at technique pressures of about 1kg/cm2 and upwards. The ...
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