Answer / sumith

PID control valves works on 4-20 ma ,plc gives 4-20 ma to
pid valve according to the difference between setpoint and
actual value (for e.g s.p temp = 90 degc actual = 30
degc)now plc will give 20ma to pid valve for temp to reach
the setpoint.pid valve should have continous air supply.
to calibrate pid valve there is span and zero adjustment.

pid tuning is done in plc not in valve.pid tuning in plc is
trial and error type tuning.
we have to some values in P and I and D and check whether it
is reaching the setpoint smoothly

Is it ok, to use non-contact type Radar type LT, on a tank that is half circular from the bottom side? If yes the, isn't the waves gonna bent in other directions? 

0 Answers   Process Control Technologies,

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I am using 971 Enraf radar level transmitter for LPG tanks ,the tank side indicator gives the error code 999999999FL can any body give me any diagnostic for this issue?

0 Answers  

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we want to control pump in let pressure and tank (for exp) our inlet line if water cam and pump will on and when our tank will full pump will off also if our inlet pressure low pump will off even tank not full.this pump i want to uses on our water supply line.

0 Answers  

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Thermocouples work as follow:

1 Answers   Dashen Brewery, Tata Power,

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Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 or 3- 15 or any other range

13 Answers   ONGC,

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What is defferent betwen ESP &PCP PUMP .HOW IT IS WORK?

0 Answers   Jindal,

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In thermocouple could we use the lug for termination or not,Thermocouple is any time,I am currently concerned with K type.please let me know if anybody know

4 Answers   Saudi Aramco Shell Refinery Company SASREF,

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How to convert 0-2500mmH2o into kg/hr? Or how to convert mmH2O into kg/hr,t/hr etc

2 Answers  

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WHEN BOTH WIRES OF THERMOCOUPLE R SHORTED WHAT IS THE OUTPUT THE TEMP ARE 0,30,250,320

13 Answers  

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In your own words, would you expect an ultrasonic level device to work better in a pressure vessel with a high pressure or a strong vacuum, and why?

1 Answers  

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Technician A says that a fuel tank sending unit will have a high resistance only when the tank is full. Technician B says that its resistance when the tank is full depends on whether the sending unit is designed for use with a bimetallic gauge or with a magnetic gauge. Who is correct?

3 Answers  

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You wish to SINK all my digital inputs to a PLC digital input card. Would you common out the leads to a positive or a negative connection?

1 Answers  

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