Answer / andy

electro-catalytic detectors detects change in resistance
whereas ir-type detectors detects changes in intensity of IR
spectrum and alerts the system whenever they detects a fire

Answer / gautam_etrx.engg

Ultraviolet rays (Earlier it was infrared rays)

Answer / faiyaz

Fire detector detect the fire like UV-ultra violet ray and IR means Infra ray both are fire one is small fire and one is big fire generally used in Hazard area like compressor and condensate area

Answer / saumyajit

in fire detectors normally we use photo resistors,which is used in wheatstone bridge circuit,in photo resistor conductivity changes as light intensity change.or we cud use photo diodes.(PN-diode,PIN-diode,avelanche diode)

How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?

0 Answers   CCIE,

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What is difference between profibus and modbus communication

2 Answers   GMR,

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If i have 4 Allen Bradely make RS logix 5000 PLC and for viewing that we are using 4 RS view SCADA for 4 different packages. Now, I will want to view two packages on only one SCADA. Then how i will do it?

0 Answers   Essar, Reliance,

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describe yourself?

1 Answers   TCS,

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why we use condesiate parts before tranmitters?

3 Answers  

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What are the advantages and benefits of using PLCs to automate a section of a plant?

2 Answers  

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in a power plant which system are compensated?

2 Answers  

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if found error in magnetic flow meter?how can we adjust?

2 Answers   ANI Instruments, Techint,

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why we are using pnp npn for sensors is there any other type?

1 Answers   CGL,

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wat are the interview questions asked in air india for post service engineer

1 Answers   AirIndia, Shree Renuka Sugars,

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Exapain Deatails of the PID controlller

4 Answers  

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1)How many tpes of vibration probe and how many tpyes of vibration. 2)how we can calibrate a vibration probe with tk3 3)what is RMS value in vibration measuring application and how we calculate it.

0 Answers  

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