Pressure Transmitter Heated Enclosures
In installations where the ambient temperature may become very cold, a protective measure against fluid freezing inside a pressure transmitter is to house the transmitter in an insulated, heated enclosure.…
Field Instruments Mounting brackets
An accessory specifically designed for a variety of field-mounted instruments including DP transmitters is the 2 inch pipe mounting bracket. Such a bracket is manufactured from heavy gauge sheet metal…
Strain Gauge Working Principle
Strain Gauge Sensors or Piezoresistive sensors Piezoresistive means “pressure-sensitive resistance,” or a resistance that changes value with applied pressure. The strain gauge is a classic example of a piezoresistive element,…
Differential Pressure Transmitter Working Principle
Another common electrical pressure sensor design works on the principle of differential capacitance. In this design, the sensing element is a taut metal diaphragm located equidistant between two stationary metal…
Pneumatic Pressure Transmitters Principle
Force Balance Pressure Transmitters or Pneumatic Pressure Transmitters First we have to know that the Force Balance Pressure Transmitters are very old concept which uses pneumatic (air) signals for transmitters operation.…
Displacer Level Transmitter Dry Calibration with Weights
A displacer level transmitter consists of a displacer element which is suspended from a hanger with a torque tube which is connected to the transmitter head. The displacer element is…
Bellows, Diaphragms and Bourdon Tubes
Bellows, Diaphragms and Bourdon Tubes Mechanical pressure-sensing elements include the bellows, the diaphragm, and the bourdon tube. Each of these devices converts a fluid pressure into a force. If unrestrained,…
Overview of Woodward Governor 505
Governor is a device which senses the speed of an engine or turbine and controls the fuel (or steam) to the engine or turbine to maintain the speed at a…
Pilot-operated Relief Valve Principle
Like other pressure relief valves (PRV), Pilot operated relief valves (PORV) are used for emergency relief during overpressure events (e.g., a tank gets too hot and the expanding fluid increases the pressure to dangerous…
Pressure Relief Valve Principle
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure,…
