There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?

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what is diffrance between FF & SMART, explain with difination

0 Answers   Bapco Bahrain Petroleum Company,

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I m appointed as an automation trainee engineer in small firm in that I am only the one , my company give me a project on s7-200 as i m beginner I don't know how to program so please send me the helpful site so that I complete my project before deadline....please help me out in this critical situation.

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How to Calibrate Interface Level Troll in field

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

1 Answers   CGL,

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what is the well head protection system?

1 Answers  

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where uses EXe /EXd/Exo/Exn/Exp/Exq/EXia

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What is the use of keyphasor in turbine.

7 Answers   Hindustan Zinc, R&D,

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What are the key features of a Distributed Control System? describing the various layers (sensor through to business system interfaces) as well as the hardware, software and security aspects of the DCS.

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How to convertion 100 m3/hr to mmH2O or to Kg/cm2?

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What is Electrical Runout & Mechanical Runout in Vibration measurement.

1 Answers  

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what is the difference between mmhg & mmwc?. i want to calibrate a transmitter in the range of -100 to 300 mmwc. Which is the reference for calibrate the Tx,if mmwc not available?. Is it mmhg or mmho2?.

3 Answers   UPL,

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