Capacitance pressure transmitter is a pressure measurement device which convert applied pressure into a current signal. Capacitive type pressure transmitter is differential pressure type sensor. Principle: Capacitive pressure transmitter works under the principle of differential capacitance. Capacitive pressure measurement involves sensing the change in capacitance that results from the movement of a diaphragm. Generaly the capacitance …
Resistance Temperature Detectors (RTD) are temperature measuring transducers used in industrial applications. RTDs are simple in construction with higher accuracy and repeatability and which are used in the applications below 600°C. Principle: As the name suggests the RTDs are temperature sensitive resistors. The resistance temperature detector (RTD) measures the electrical conductivity as it varies with …
A thermistor is a semiconductor device formed from metal oxides. thermistors are used in many applications requiring information about process equipment for alarming and indication purposes. Principle: The principle of temperature measurement with a thermistor is that its resistance changes with temperature. Most thermistors differ from normal resistors in that they have a negative coefficient of …
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Vortex flowmeter is a differential pressure measuring flowmeter which can measure both liquid and gas flow measurement. Vortexes are used for continuous flow measurement. Principle: When flow stream passes a stationary object or a bluff body and causes the formation of swirls, called vortices, downstream from the body. Each vortex will form, then detach from …
What are Mass flowmeters? A Mass flowmeter measures the amount of fluid pass through the pipe. Mass flow measurement gives a more accurate account of fluids and is not affected by density, pressure and temperature (unlike volumetric measurements). Although most meters can infer mass flow rate from volumetric flow measurements, there are a number of …
What is thermocouple? A thermocouple is an active transducer which directly converts thermal energy into electrical energy. It is a simple device made by joining to dissimilar metals or semiconductor forming a junction. It produces a voltage when the temperature at the junction changes. Principle: The Seebeck Effect: A thermocouple works on the Seebeck Effect. This …
Globe valve is widely used by sliding stem valve or linear motion valve used to regulate flow in a pipeline. Globe valves are named so because of the spherical body shape. Construction & Working: The valve plug is the essential part of the globe valve. Because the plug absorbs the pressure of the flow (with a …
Pitot tube is a device used to measure the fluid flow measurement invented by Henri Pitot, a French engineer in 18th century. It is widely to measure the airspeed of aircrafts, speedboat speed and for fluid flow measurement in industrial application. Pitot tube measures the pressure point in contact. Principle: The pitot tube is a differential …
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What is control loop? A Control loop is the fundamental building block of the industrial control system or industrial automation. It is a group of components working together as a system to achieve and maintain the desired value of a system variable by manipulating the value of another variable in the control loop. An instrumentation …
