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Active and passive Instruments

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Active and Passive Instruments: Active and passive Instruments Passive Instruments: The instruments where the output is produced completely by the quantity that is measured are called passive instruments. The example of passive instrument is a pressure gauge.Fig  shows a pressure gauge. Passive  Instrument As the pressure in the liquid changes, the piston moves.The pointer is connected to the piston. No other source of energy is used. The liquid pressure is the only source. Thus,the piston and pointer movement while measurement is entirely dependent on the liquid pressure. Active Instruments: Active instruments are the instruments in which the quantity to be measured activates the magnitude of external power input source that produces the measurement. The liquid level indicator is an example of an active instrument.Fig.1.4.2 shows a liquid level indicator. Active Instruments The power source is required in or...
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Classification of Instrumentation System

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Classification of Instrumentation System Instrumentation system Null and Deflection type Instruments: Deflection type instruments: The instruments in which deflection of the instrument forms the basis of measuremenl are called as deflection type instruments. The example of deflection type instruments is the permanent magnet moving coil (PMMC) ammeter. PMMC AMMETER The deflection of the coil is proportional to the current that is to be measured. Torque Td, that acts on the moving coil is proportional to current.The opposing effect is produced by a spring, having torque Tc which is proportional to the deflection. When the spring is balanced Tc=Td. The value of the current depends on the deflection.Thus,the value of the measured quantity depends upon the calibration of the instrument. Null type Instruments The instrument in which, a null or zero indication will lead to the determination of the magnitude of the measured quantity such instruments are c...
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Basic Detail of Power Factor

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  Power Factor What is Power Factor ? It is the ratio of the active power of the fundamental wave the apparent power of  the fundamental waveform    Cause:    Inductive load which cause large difference of phase angle between current and voltage,Varying load,  industrial heating furnace, harmonic currents, electrical discharge lamp, AC motor, arc welder, furnaces, fluorescent lighting and air conditioning. Effect: overheating of motor and poor lightening.    Power factor correction: This is normally achieved by the addition of capacitors to the electrical network which compensate the active power. To reduce losses in the distribution system, and to reduce the clectricity bill, power factor correction, usually in the form of capacitors, is added to neutralize as ch of the magnetizing current as possible. Capacitor included leads the voltage, producing a leading power factor. The corrected power factor will be 0.92 to 0.95. Why to improv...
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Safety Signs and Symbols used in Industries

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 Industrial  Safety signs: Warning sign - Warning sign a sign giving warning of hazard or danger Overhead load - Overhead load There material handling going by Crain overhead Caution - Caution There is obstacle in the way Flammable material The material flammable. Direction signs - Direction signs Used for route direction Raised platform or height restriction - Emergency fire exit - Emergency fire exit First-aid facility - First-aid facility Fire extinguisher - Fire extinguisher Different types of fire classes and their prevention: Class A Fires - Class A Fires  Fire involving combustible material like wood, paper, cloth, rubber, plastic requiring the heat absorbing effects of water, water solutions. Class B Fires - Class B Fires This type of fire involves flammable or combustible liquids greases, petroleum products and' similar materials for extinction, a blanketing effect is essential. Class C Fires - Class C Fires Which involves the flammable gases, substan...
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Types of Electrical Energy

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 TYPES OF ELECTRIC ENERGY:     Electrical Energy in the methods of science,we immediately become suspicious of any scheme who claims to create energy. The law of conservation of energy is  that energy can neither be created nor destroyed. However, its form can be converted such that energy can be converted from one form of energy to another. Electric energy is the energy who converted from some other form. There are a numbers of way in which this is accomplished. Some of them are as follows: (1)Electrochemical energy conversion: Electric batteries produce electric energy with  the help of  conversion of chemical energy. A potentially important use of this type of batteries is in the electric car. Fuel cell is in this general classification. (2)Electromechanical energy conversion: The rotating generator produces electric energy from mechanical energy of rotation. Usually, the mechanical energy who converted from thermal ene...
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