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Listed on Jun 14,2019
By Admin
Some people think that “pressure transducer” and “pressure transmitter” mean the same thing, but they don’t. All pressure transmitters have pressure transducers and some even have more than one. As a matter of fact, some have more than one. What is a pressure transducer? A pressure transducer converts the pressure on the sensor into an analog...
Listed on Jun 14,2019
By Admin
In this article, we will discuss the various types of encoders and which encoder may be used for which function. we are going to discuss the difference between Absolute and Incremental encoders and which one may be used for which function. Encoder Types and Technologies There are many types of encoders but they basically fall into tw...
Listed on Jun 06,2019
By Admin
Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe. At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe and its reflections from the fluid are the same. Under flowing conditions, the frequency of the reflected wave is different due to the Doppler effect. When the fluid moves...
Listed on Jun 06,2019
By Admin
A tachometer is a sensor device used to measure the rotation speed of an object such as the engine shaft in a car, and is usually restricted to mechanical or electrical instruments. This device indicates the revolutions per minute (RPM) performed by the object. The device comprises of a dial, a needle to indicate the current reading, and marki...
Listed on May 28,2019
By Admin
Today you will learn about VFD. Specifically, what it is and when do we use it with automation and PLCs. So what exactly is a VFD? Well, it stands for Variable Frequency Drive. They are used for running an AC motor at variable speeds or let them ramp up their speed to give them a smooth startup. Some people simply call them drives. ...
Listed on May 28,2019
By Admin
Vortex flow meters are broad spectrum flow meters one can use in areas of metering, measuring and control of liquid, gas or mostly steam flow. Many prefer these devices due to their high stability, the versatility of medium and their high reliability. As such, the petroleum and chemical industries, as well as metallurgy, food, paper, urban pip...
Listed on May 22,2019
By Admin
So far, we’ve talked about control valves as basically body and actuator. Depending on the application, you may need some accessories to beef it up. Today, let’s review one of the most important, valve positioners. What’s a valve positioner? Valve positioners translate signals from the control system to send the right pressure to an actuator....
Listed on May 22,2019
By Admin
The electro -pneumatic positioner is used in Control Valves with pneumatically operated actuators. The valve is operated by means of electrical controller or Control Systems With an control signal of 4 to 20 mA or split ranges of 4~12/ 12~20 mA. Electro-Pneumatic Positioner converts this control signal into a pneumatic output in proportion to...
Listed on May 15,2019
By Admin
Manifolds are used in my many fluid power applications, depending upon the application. Manifolds are used in hydraulics as well as pneumatics, and can be used to mount valves or to consolidate plumbing. When used for mounting valves, they are the interface between the valves and the ports to be plumbed into. With industrial style hydraulic va...
Listed on May 15,2019
By Admin
Needle valves are designed to allow precise flow control. Its name is derived from the sharp pointed disc and matching seat. They are extensively used for continuous blow-off or chemical feed control services. The stem threads are finer than usual so that considerable movement of the hand wheel is required to increase or decrease the opening t...
Listed on May 08,2019
By Admin
Liquid Flow Meter A liquid flow meter is a device, which is utilized to gauge the flow of a liquid. A liquid flow meter is also a useful device when it comes to gauge the volume of liquid that flows through the pipes. A liquid flow meter is commonly deployed in most of the industrial as well as domestic areas in order to deliver the accurate m...
Listed on May 08,2019
By Admin
Several distinct features in liquid flow meters differentiate them on the basis of their functionality and accuracy. To help select the best model for a particular use without overspending, consider the options below for volume-based meters. Coriolis Meters Coriolis meters use two designs to provide true mass flow measurement; one is a single...
Listed on May 03,2019
By Admin
HART stands for ‘Highway Addressable Remote Transducer’ and is a standard originally developed as a communications protocol for control field devices operating on a 4-20 mA control signal. The HART protocol uses 1200 baud Frequency Shift Keying (FSK) based on the Bell 202 standard to superimpose digital information on the conventional 4-20 mA ...
Listed on May 03,2019
By Admin
Pressure or vacuum gauges, if get damaged or don’t function properly can lead to leaks and emissions which may result in contamination of workplace or in some cases a fire explosion. Such unfortunate incidents not only cost lives of those working with and around the pressure gauges, but also major financial loss to the Company. One of the fail...
Listed on Apr 08,2019
By Admin
The various possible configuration levels for a pressure measurement solution are not defined conceptually in any standard. At WIKA we have chosen the following terminology: Pressure sensor (pressure transmitter) A pressure sensor (also pressure transmitter) delivers a standardised, processed signal within a housing with commonly available pr...
Listed on Apr 08,2019
By Admin
Process measurement sensors are not indestructible. Not even the most rugged device is fully immune to the chemical nature of process media or the kinetic impact associated with fluid composition and movement. Balancing degrees of protection, usually to increase the useful life of the device, with sensor response and accuracy is a frequent cha...
Listed on Apr 02,2019
By Admin
DIFFERENT SENSOR TYPES USED FOR VIBRATION MEASUREMENTS 1. VELOCITY SENSORS Electromagnetic linear velocity transducers : Typically used to measure oscillatory velocity. A permanent magnet moving back and forth within a coil winding induces an emf in the winding. This emf is proportional to the velocity of oscillation of the magnet. This perma...
Listed on Apr 02,2019
By Admin
A transducer that produces a voltage pulse for each turn of the shaft, called the Keyphasor. This keyphasor signal is used primarily to measure rotating shaft speed and serves as a reference for measuring vibration phase lag angle. It is an essential element in measuring rotor slow roll bow or runout information.The Keyphasor transducer is typ...
Listed on Mar 25,2019
By Admin
Many traditional flowmeter technologies respond to the volumetric flow rate of the moving fluid. Velocity-based flowmeters such as magnetic, vortex, turbine, ultrasonic, and optical generate output signals proportional to the speed of fluid molecules and nothing else. This means that if the fluid flowing through one of these flowmeter types were to...
Listed on Mar 25,2019
By Admin
The tubes within a Coriolis flowmeter are shaken at their mechanical resonant frequency to maximize their shaking motion while minimizing electrical power applied to the force coil. The electronics module uses a feedback loop between the sensor coils and the shaker coil to maintain the tubes in a continuous state of resonant oscillation. ...
Listed on Mar 12,2019
By Admin
Level gauge is a device which is used to show the level of fluids in fields. Depending on the type of application used, the type of level gauge should be selected. Level gauge is a direct method for measuring the level. Level gauge consists of a metal body, machined to have an internal chamber and one or more front windows. On each window a sp...
Listed on Mar 12,2019
By Admin
Metal Seated Ball Valves Engineered to excel in the most demanding industrial settings where valve deficiencies can endanger safety, plant efficiency and reduce profitability, metal seated ball valves stand out. These long-lasting valves are perfect for the oil and gas industries, refining and power generation. Metal Seated Valves vs. So...
Listed on Feb 28,2019
By Admin
A variation on the theme of turbine flow measurement is the paddle wheel flowmeter, a very inexpensive technology usually implemented in the form of an insertion-type sensor. In this instrument, a small wheel equipped with “paddles” parallel to the shaft is inserted in the flow stream, with half the wheel shrouded from the flow. A surprisingly...
Listed on Feb 28,2019
By Admin
Differential pressure meters work on the principle of partially obstructing the flow in a pipe. This creates a difference in the static pressure between the upstream and downstream side of the device. This difference in the static pressure (referred to as the differential pressure) is measured and used to determine the flowrate. Differential-p...
Listed on Feb 22,2019
By Admin
Valves are mechanical devices. They are basic elements with which the flow of fluids and pressure within a system can be regulated. They are mainly used to control the direction of fluid flow as well regulate the amount fluid flowing through a particular system or a process. Valves perform any of the following functions. Starting and stop...
Listed on Feb 22,2019
By Admin
Valve actuators are devices used to position valves. They can be used to fully open and shut a valve, or in an application that requires constant and precise control, such as regulating the flow of fuel to a gas turbine, modulate the position of the valve. There are many applications that call for the use of actuators, such as: Automating...
Listed on Feb 15,2019
By Admin
It would be difficult to chart a career course in the industrial process control field without being exposed to thermocouples. They are the ubiquitous basic temperature measuring tools with which all process engineers and operators should be familiar. Knowing how thermocouples work, how to test them, is essential. Sooner or later, though, you ...
Listed on Feb 15,2019
By Admin
To select an ideal thermocouple first we need to understand the need of measurement application and requirement. Factors affecting temperature change Accuracy required- impact of sensor accuracy on overall measurement accuracy. Length of deployment Thermocouple material selection Selection of the Measuring Junction Du...
Listed on Feb 07,2019
By Admin
Hydraulic actuators use liquid pressure rather than instrument air pressure to apply force on the diaphragm to move the valve actuator and then to position valve stem. Nearly all hydraulic actuator designs use a piston rather than a diaphragm to convert fluid pressure into mechanical force. The high pressure rating of piston actuators len...
Listed on Feb 07,2019
By Admin
A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using air pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of la...
Listed on Jan 30,2019
By admin
Differential pressure flowmeters are a type of inferential flowmeter where the flowrate is calculated from a non-flow measurement. In this case various methods of obstructing flow are used to create a pressure drop across a section of pipe. The flow rate is then easily calculated from the measured pressure drop using Bernoulli’s prinicple. Dif...
Listed on Jan 30,2019
By admin
An variable-area flowmeter is one where the fluid must pass through a restriction whose area increases with flow rate. This stands in contrast to flowmeters such as orifice plates and venturi tubes where the cross-sectional area of the flow element remains fixed. The simplest example of a variable-area flowmeter is the rotameter, which uses a ...
Listed on Jan 25,2019
By admin
A shutdown valve (also referred to as SDV or Emergency Shutdown Valve, ESV, ESD, or ESDV) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. Shutdown Valve This provides protection against possible harm to people, equipment or the environment. Shutdown valves form part of a Safety Inst...
Listed on Jan 25,2019
By admin
The method of representing, encoding, and transmitting the data is called the protocol. At the field level, the dominant protocols for process instruments are HART, FOUNDATION Fieldbus H1 and PROFIBUS PA. Difference between Fieldbus, Profibus and HART Protocols Foundation Fieldbus is an all-digital, serial, two-way communications system ...
Listed on Jan 15,2019
By admin
Applied extensively in industrial process measurement and control, a rotameter is an instrument that uses a float of given density to establish, for any measurable flow rate, an equilibrium position within the fluid stream where the force of the flowing fluid equals the force of gravity. Let’s break that down a little. A rotameter has a tapere...
Listed on Jan 15,2019
By admin
Control Valve Basics – Types Valves are used for thousands of purposes, from simple and mundane tasks, such as turning on the water in a kitchen sink, to tasks as important and difficult as controlling water flow through a nuclear reactor. Regardless of the application, valves are crucial in controlling the flow of liquids and gases in everyda...
Listed on Jan 02,2019
By admin
Limit Switch is a switch operated by the motion of a machine part or presence of an object. They are used for control of a machine, as safety interlocks, or to count objects passing a point. Standardized limit switches are industrial control components manufactured with a variety of operator types, including lever, roller plunger, and whisker ...
Listed on Jan 02,2019
By admin
Ultrasonic is a non-contact level measurement method that uses sound waves to determine the process material being measured. Ultrasonic transmitters operate by sending a sound wave, generated from a piezo electric transducer, to the media being measured. The device measures the length of time it takes for the reflected sound wave to return to ...
Listed on Dec 28,2018
By admin
What is a vibration switch? A vibration switch is a device that recognizes the amplitude of the vibration to which it is exposed and provides some sort of response when this amplitude exceeds a predetermined threshold value. The switch response is typically an electrical contact closure or contact opening. The electrical contact may be either an e...
Listed on Dec 28,2018
By admin
A Differential Pressure Switch, just like a regular pressure switch, is a simple electro-mechanical device that operates on the basic principles of levers and opposite forces. Mainly, they are used for sensing a difference between two points in a process. Three key elements are used in various combinations to manufacture different kinds of differen...
Listed on Dec 19,2018
By admin
BRIEF EXPLANATION OF VIBRATION SENSOR PRINCIPLES: 1. VELOCITY SENSORS Electromagnetic linear velocity transducers : Typically used to measure oscillatory velocity. A permanent magnet moving back and forth within a coil winding induces an emf in the winding. This emf is proportional to the velocity of oscillation of the magnet. This permanent ...
Listed on Dec 19,2018
By admin
What is a Valve Actuator? A valve actuator is the device that is joined to the valve that converts motive power e.g. pneumatic power, into movement of the valve stem. This movement opens, closes or modulates the valve. Types of Actuators Valve actuators are generally split into one of four types, dependant on the motive force they receive, n...
Listed on Dec 07,2018
By admin
An instrumentation control system is an electrical, electronic, or programmable electronic system (E/E/PES) which may perform some or all of the following functions: Monitoring, recording and logging of plant status and process parameters; Provision of operator information regarding the plant status and process parameters; Provision ...
Listed on Dec 07,2018
By admin
A safety control system or device is deemed to be safety related if it provides functions which significantly reduce the risk of a hazard, and in combination with other risk reduction measures, reduces the overall risk to a tolerable level, or if it is required to function to maintain or achieve a safe state for the equipment under control (EUC). ...
Listed on Nov 30,2018
By admin
An on/off valve is the fluid equivalent of an electrical switch: a device that either allows unimpeded flow or acts to prevent flow altogether. These valves are often used for routing process fluid to different locations, starting and stopping batch processes, and engaging automated safety (shutdown) functions. Valve styles commonly used for o...
Listed on Nov 30,2018
By admin
Flow Switch is a mechanical switch that is switched on or off in response to the flow or non-flow of a fluid such as air or water. The switch typically operates through the use of a paddle which gets displaced due to the force of fluid moving past it. The flow switch consists of a paddle system. which has a permanent magnet located at its uppe...
Listed on Nov 21,2018
By admin
Functions of Temperature Detectors Although the temperatures that are monitored vary slightly depending on the details of facility design, temperature detectors are used to provide three basic functions: indication, alarm, and control. The temperatures monitored may normally be displayed in a central location, such as a control room, and may have ...
Listed on Nov 21,2018
By admin
Thermocouples measure temperature and are used quite often in process controls. How They Work When wires of two different thermoelectrically homogeneous materials are joined at one end and placed in a temperature gradient, a thermoelectric voltage (EMF) is observed at the other end. The connection is called the measuring junction. On all ...
Listed on Nov 14,2018
By admin
Pressure Detector Functions Although the pressures that are monitored vary slightly depending on the details of facility design, all pressure detectors are used to provide up to three basic functions: indication, alarm, and control. Since the fluid system may operate at both saturation and subcooled conditions, accurate pressure indication must be...
Listed on Nov 14,2018
By admin
Vacuum Gauges where the Pressure Readings are Independent of the Type of Gas (Mechanical Vacuum Gauges) Bourdon Vacuum Gauge The inside of a tube which is bent into a circular arc (the so-called Bourdon tube) is connected to the vacuum system. Due to the effect of the external atmospheric pressure, the end of the tube bends more or less d...
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