what is dry leg and wet leg in transmeter calibration?
Answer Posted / lalit meghwal
Close tank with wet leg:
Span = ( X ) ( GL )
HW at minimum level = ( Y ) ( GL ) – ( d )( GS )
HW at maximum level = ( X + Y ) ( GL ) – ( d ) ( GS )
Where : GL = Specific gravity of tank liquid
GS = Specific gravity of tank liquid
HW = Equivalent head of water
X, Y and Z are shown in fig.
Example :
X = 300 inches
Y = 50 inches
d = 500 inches
GL = 0.8
GS = 0.9
Span = ( 300 ) ( 0.8 ) = 240 inches
HW minimum level = ( 50 ) ( 0.8 ) - ( 500 ) ( 0.9 ) = - 410 inches
HW maximum level = ( 300 + 50 ) ( 0.8 ) – ( 500 ) ( 0.9 ) = - 170 inches
Calibrated range = - 410 to –170 inches head of water.
( minus sings indicate that the higher pressure is applied to the low pressure side of the transmitter )
Is This Answer Correct ? | 9 Yes | 2 No |
Post New Answer View All Answers
hi,i am doing 3 year in electronic and instrumentation engineering. what type of aptitude questions will be asked in a core industries and how can i improve my skills in instrumentation?
Explain the use of hair spring in the pressure gauge.
what is commisioning procedure,2)what is is the main work in commisioning in the field tx to dcs, plz send me detail
why orfice is not used for main steam flow calculation
how to calibrate Necleuonic level transmitter.?
why Fahrenheit unit of moistur analyzer transmitter
basic connection and principle of axial shift sensor n differential sensors in tubine describes n draw......
What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?
Explain working principle of lvdt?
I am teja. I am studying Msc(tech) Electronics and Instrumentation (3years course) in Andhra university. But my course is not recognised by UGC and AICTE. Please tell me the job opportunities after this course. And i fineshed PLC course in IGIAT ,Vizag.Also complted my short term coure in SCADA, Seimans WinCC in ATI,Hyd.After Msc can i join Mtech for good job? or phd. How i can get good job in INdustrial Automation Side. Please give replay.Because this is my life matter.
We Have Two Field bus Pressure Transmitters of Different Sensor Range (I.E One is of Lower range and Another is of Higher Range).Is same Process Line. My Question is Can i provide Saturation Limit to my field Bus Transmitter as We can provide Saturation current limit to HART Instruments. As During Low Pressure Both Working OK ,But During High Pressure, transmitter with Lower sensor range Goes to Fault mode as Beyond its Sensor Limit it can Measure, So may I provide Saturation point Some where to Suppress This Fault during High Pressure.
Can any one send me IOCL instrumentation question papers.. i dont know the pattern of the questions and what to prepare can any one help me on this .. my email id is anwarnishil@gmail.com
Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.
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 ?
how many type conductivity sensor ?