Answer / y.kathirvel

the smoke detector is a thing that detects the smoke by intensity variation of that area under control. if any fire occurs there the light intensity on that area decreases. this can be measured my photo metric method.Photometric measurement is based on photodetectors, devices (of several types) that produce an electric signal when exposed to light. Simple applications of this technology include switching luminaires on and off based on ambient light conditions, and light meters, used to measure the total amount of light incident on a point.its o/p will be in mV.

working principle of lvdt?

2 Answers  

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In 2 wire transmitter 1 wire is used for power and other is used for signal( 4-20)ma In 4 wire transmitter 2 wires are used for power and 2 wires are used for signal (4-20)ma . but my question is "what is the criteria or parameters we have to consider while selecting these transmitters for eg( distance, safety zones etc.

1 Answers  

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List three types Level Switches with their working principles

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How many types of sensor

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WHAT IS THE MASS FLOW FLOW METER

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what is the differnce between PLC & DCS

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How to work & calculated output of the Derivative action in pid controller (Explain Derivative controller)

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Please send the all question with answer related for interview.

1 Answers  

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what is the PID controller?

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deference between DCS and PLC including date processing and architacture.

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difference between repeatability and reproductability

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How does SmartPlant Instrumentation interface with physical design (3D modeling)?

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