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What is pipe schedule? What are all effects its having in the valve? how do we take care of pipe sch in case if the customer dint specify in the data sheet. What we need assume and in what basis?
3 7587What is difference between flame retardant & flame resistance cable? Among which type of cable is used for ESD & Fire and Gas system application?
1 8447Related to control system, What is difference between 4-20 mA active & 4-20 mA pasive signal.
1 6697While preparing the graphic diagrams trend display, 3 types of trends are prepared by Yokogawa system vender. These are for process variable, manipulated variable & set point variable. Why these 3 trends are required? Explain the purpose of these 3 trends.
1 4050What is difference between “Fault Tolerant” & “Fault avoidance” PLC? Application where these system s are used?
3936Why do we need to install hook-up line differential pressure type level transmitter when the differential pressure type level transmitter with capillary are available?
2 9544How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error
2 5322Post New Instrumentation Questions
What is Positive Calibration and Negative Calibration?
HI, can anybody give details about GAS TREATMENT PLANT CONSTRUCTION,as INSTRUMENTATION ENGINEER what are the responsibilites.what are the instruments mainly instrumentation engineer will deal with
1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling
How would you choose differential range?
what are the diff. in servo and regulatory control?
Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?
What is shielding effect?
Positioner usage.
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
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What is exact difference between the panel earthing and system earthing in DCS system. What is the value of resistence.
Square root calculation for dp flow transmitter?
In Safe Guarding test what means by "Failed to Danger" ?
Calibration procedure for Electro magnetic Flow meter
what are procedure of sox-nox calibration
