Answer / ayaz

analog input/output is continuously  vary signal for example process variable continuously change so transmitter output continuously chnage 
and digital input/output is only zero or one ( o mean off condition and 1 mean on condition ) digital use only on off devices 

Answer / ayaz

dear all I am currently working with omv pakistan i want a job in instrument tech please help him 

How to get Cv of control valve having following parameter ,i.e inlet pressure 4.5kg/cm2 outlet pressure 1 kg/cm2 specific gravity 0.808

3 Answers  

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what is the working principle of ABB gas analyser of kiln in cement industries

4 Answers  

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How we can do the linearity test for Bently Naveda Vibration Probe?

1 Answers   Sabic,

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1.what is beta in control valves? 2.what is the condition followed by light in LASERs? 3.1kg/cm2=?psi 4.Integral action reduces what? 5.about vena contracta 6.a simple RC circuit 7.thermistor material's temp coefficient of resistance 8.if wave passes through the thicker area of a chord to a thinner area what changes will occur to wavelength? 9.if 4-20 mA represents 0-10 kg/cm2 what will be the current when pressure is 5 kg/cm2.................

0 Answers   Lurgi,

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what barrier is used in process industry.

3 Answers   ADMA OPCO, Process Industries,

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Anybody can tell me  how to convert mmHg2o /psi to scfm  please give me formula of conversion

0 Answers   Samsung,

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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.

0 Answers  

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How to calibrate Field bus transmitter? procedure ?

0 Answers   Parco,

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in DCS or PLC we can not put all ai or di,there is calculation through which we can accomodate certain no of digital and analog signal.I need to know that calculation

1 Answers  

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detail of mass flow meter pricipal

0 Answers  

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what is the meaning of HART ?

2 Answers  

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Explain ratio control system.

1 Answers  

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