Answer / ripul ghosh

nowadays 24V DC relays are used compared to 230V what was used before..relays are mainly there to isolate the controller from high power lines,
The signal from the controller will come to the relay and it will get energised to drive the output load.

Answer / nirmalya basu

to energise a output by plc and for its protection purpose
also.

Answer / ganesh

the relay works with AC and DC.
it provide the isolation between controller and devices works on ac and dc.
it is extremely useful when you need to control a large amount of current or voltage with small electrical signal.

Answer / suresh agravat

Example pressure transmitter input showing fiied full with liquid than send singnal through output to relay. When relay deenergised motor contactor not get supply and it will be motor or pump stop. Relay is basically on/off switch

what is the difference between 2 wire and 3 wire RTD- application wise,cost effectivity?

2 Answers  

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what is the input to be given digital temp controller during the the calibration time?

2 Answers  

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what is thermo coupler and how it works

2 Answers   Tisco,

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what is the difference b/w normal thermocouple and skin type thermocouple?

1 Answers   Heisco,

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Define magnetic flow meter and mass flow meter.

1 Answers   Ramco,

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how to caluculate flow by using transmitter?tell me plz I am eagerly waiting for your reply..

2 Answers   Agi Glaspac, Reliance Power,

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What is diffrence between Transducer and Transmitter?

13 Answers   Ford,

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why use MMWC unit

9 Answers   Praxair, Saipem,

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wht is mean by dpt(differential pressure transmitter)

1 Answers  

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What is eddy current? Describe the operating principle of proximity probe.

0 Answers  

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the square root type transmitter r used to which applications

4 Answers   Roche,

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what is the difference between impact plate n coriolis type solid flow meters n how they works....n which one is better

1 Answers  

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