65 Square Root Extractor Lab Report

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The objective of this lab is to gain an understanding of the functions and characteristics of a Moore model 65 Square Root Extractor such as the principles of operation, calibration of the instrument, and its use in industry. Principles of Operation: For this lab I worked with a Moore model 65 Square Root Extractor. The extractor works by taking in the pneumatic signals of differential flow transmitters and providing a linear output so the signals can be added, subtracted, averaged, or when the signals need to be linear to provide a proper representation for a control loop. The Extractor uses the cosine function of a small angle to give square root conversion. The angle is created by a continuous balance between the motion of the input pressure…show more content…
This restricted air acts upon the top of the booster diaphragm, controlling the pilot valve, to either allow more supply air to pass or to vent air to the atmosphere through the exhaust port. This pilot air change is one sixth the transmitted air change. When input air pressure is increased at the input capsule the floating pilot link is moved closer to the center stem. This closes the nozzle further and decreases the flow of pilot air to the atmosphere. Thus the pressure above the diaphragm is increased causing the pilot valve exhaust to close while opening the supply port which increases the transmitted air pressure. The increase in transmitted pressure moves the bottom of the exhaust diaphragm opening the exhaust port and suppressing the supply port thus equalizing the booster pilot…show more content…
If 4.2 psi is not read turn the zero screw in to lower output pressure or turn the zero screw out to raise the output pressure. If 3-15psi input is not used multiply the output span by .01 and add to the 0% input value to find the new zero input value. If 3-15psi output is not used multiply the receiver span by .01 and add to the 0% output value to find the new zero output value. Then adjust the zero screw as before until the correct zero value is read. To adjust deviation set input pressure to 6 psi at this point the output pressure should read 9 psi. Now adjust the input pressure to 15 psi at this point the output should read 15 psi. If the reading are not correct then calculate the deviation error using the formula; (Deviation Error) = (Error at Half-scale) – ((Error at Full-scale)/2). If the error is between .06 and -.06 psi then no correction is needed, but if the error does not fall within the limits than adjust the slotted deviation brushing until the error is

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