Answer / banerjeenandan

As the Generator output frequency remains constant usually
50Hz, so we have to control the speed of the turbine in
constant speed. Govorner takes the signal from Magnetic
Pickup Unit (MPU) and operates the govorning valve so that
the turbine rotates in constant speed.

The magnetic pickup unit is mounted on turbine front, facing
the gears of the gear wheel. Generally there remains 2 or 3
nos of sensors which measure the speed simultaneously. As
the turbine rotor rotates, the number of gear teeth cutting
by the sensor increases. This is counted at the sensor
itself. According to this the sensor sends an mA signal to
the govorner. And thus with respect to this, the govorner
takes action to open or close the Govorning valve to
regulate the flow of steam entering into turbine.

Answer / pankaj rathi

Mr.Banerjee ur answers is correct but the mpu does not send the ma to governor . But it send the ac voltage to governor. 

Close loop and open loop diagram for instrumentation

1 Answers   Petron ltd,

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I want to install analog type, flange mounted gas flow meter (line size - 2"), for CNG flow measurement.Kindly give some details of flowmeter or suppler name, available in India.

1 Answers  

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How d.p. Transmitter can be applied to close tank?

0 Answers  

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What is rtd output signal

4 Answers   Nestle,

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Pressure transmitter working Principles?

1 Answers  

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What are primary elements of measuring pressure? Which type of pressure can be measured by these elements?

0 Answers  

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what is the difference between(Flame proof/Explosion proof)& Fire proof instruments.Both are same or different & if different in which way because the transmitter which have approved ATEX flame proof enclouser but it use PTPE O ring & PTFE Head Gasket,so its (fire safe/fire proof)????????

4 Answers  

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How many types of sensor

0 Answers   Petro Rabigh,

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How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

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When doing a liquid seal on a differential flow transmitter , most of the time the sealing liquid will be heavier then the process fluid. For wich application will the sealing liquid be lighter than the process fluid if transmitter is mounted below the process line.

0 Answers   Chevron,

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waht is difference between pressure transmitter and transuducer

4 Answers   Gasco,

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what is the best method to measuring level in high pressure and temperture thank?

4 Answers  

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