Types of Angular Velocity Measurement
Angular velocity is measured using devices called tachometers. Tachometers are instruments that measure angular speed by registering anyone of the following Number of rotations during the contact period (or) Number…
Moving Magnet Type Velocity Transducer
Principle of Moving Magnet type Velocity Transducer When a permanent magnet moves inside a coil, the change in the length of the air gap varies the reluctance. Hence the output…
Moving Coil Type Velocity Transducer
Principle of Moving coil Type Velocity Transducer A coil moves in a magnetic field according to the velocity applied. The voltage in the coil becomes a measure of the velocity…
D’Arsonval Movement
The main aim of a measuring system is to presnt the data in an understandable manner to the user / observer. The data presentation device is called as an output…
What is Magnetic Tape Recorder ?
A recorder is used to produce a permanent record of the signal that is measured. A record is used to analyse how one variable varies with respect to another and…
Seismic Displacement Sensing Accelerometer
When a spring – mass – damper system is subjected to acceleration, the mass is displaced, and this displacement of the mass is proportional to the acceleration. Hence a measure…
Electrical Torsion Meter Principle
Torque Measurement using slotted Discs Due to the applied torque, there is a relative displacement between the two slotted discs. Due to this relative displacement of the slotted discs, a…
Types of Control Valves Noise
Noise is the result of energy dissipation in the control valve. Types of Control Valves Noise The major sources of control valve noise are Mechanical vibration of components Hydrodynamic noise…
Control Valves Chemical attack Problems
Corrosive chemicals may attack the metal components of control valves if those components are not carefully selected for the proper service. Control Valves Chemical attack A close-up photograph of a…
FF Function block Modes
All FF function blocks must support multiple modes of operation, describing how the block should execute its intended function. Several different function block modes are commonly found for FF function…
