Barton 202 User Manual

MODEL 202E DIFFERENTIAL PRESSURE RECORDERS User Manual Part No. 9A-10060, Rev Rev.. 01 January 2008

CONTENTS Section 1 - Introduction ....................... ............................................... ................................... ........... Pressure Elements/Chart Drive Tables .................................. Section 2 - Installation/Calibration Check ...................... ................................. ........... Section 3 - Maintenance and Calibration ....................... .................................. ........... Section 4 - Troubleshooting ..................................................... Section 5 - Installation Drawings .............................................. Section 6 - Parts/Drawing List ..................... ............................................. ............................ .... Specications (DPU/Instrument) ....................... .............................................. .......................

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SECTION 1 - INTRODUCTION General  The Barton Model 202E single DP Flow Recorders measure and record system operation parameters, including gas and liquid ow rate, liquid level in a vessel, and other system variables that can be measured by differential pressure and static pressure methods. Main Components 

Differential Pressure Unit The Barton Model 199 Differential Pressure Unit (DPU) actuates the recorders. The DPU is a dual bellows assembly enclosed within pressure housings. The bel lows are liquid lled and withstand overranges equal to the working pressure of the housing without calibration change. Movement of the bellows is transmitted through a torque tube from the DPU to the recording mechanism. The torque tube is hermetically sealed to eliminate friction and leakage; it does not require lubrication.

SAFETY  Before installing this instrument, become familiar with the installation instructions in Section 2. WARNING notes that appear on the following pages of this manual should be reviewed before proceeding: 8, 20, 21, 22, and 25. WARNING notes indicate the presence of a hazard which can cause severe personal injury, death, or substantial property damage if warning is ignored. CAUTION notes indicate the presence of a hazard which can cause moderate personal injury or property damage if warning is ignored.

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7.

8.

9.

14

Apply 50% differential pressure to the high-pressure side. Arrange the differential pressure linkage as shown on page 12. Set a 90° angle between the drive arm and link. By varying the length of the link, set a 90° angle between the range arm and link. Slip the range arm to 50% on the chart. Remove pressure. The pen should indicate zero. If the pen deviates less than 10% from zero in either direction, perform fine adjustment by using the pen zero adjust screw (refer to page 12) and proceed to step 8.b. If the pen deviates more than 10% from zero, make adjustments as follows: a. Rotate pen arm and shaft by gripping the range arm and forcing (or slipping) the pen until it indicates zero. The pen arm and shaft should rotate at the range arm pivot point without loosening the range arm lock screw. b. Apply 100% pressure. Make the necessary adjustment by turning the range arm adjust screw counterclockwise if the pen is slightly underranged and clockwise if the pen is slightly overranged. Repeat zero and 100% adjustments until calibration at these points is achieved. c. Apply 50% pressure. The pen should be on the 50% chart line. If the pen is low, lengthen the linkage to make a correction 40 times as great in the low direction. Adjust the pen to 50% as in step 8.a. (refer to page 12). If the pen is high, shorten the linkage to make a correction 40 times as great in the high direction. Adjust the pen to 50% as in step 8.a. Assure all linkage screws are retightened. Repeat step 8 until calibration of all three points (0, 50, and 100% indication) is achieved. To assure accuracy, a nine-point calibration check (1, 24, 50, 74, and 100% ascending and descending) must be run.

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

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

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38

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39

Instrument Specifcations 

Case. Die-cast.aluminum,.black.epoxy.resin.paint,. waterproof.and.weather.resistant;.hinged.door;. neoprene.gasket.seal DP.Accuracy: 0-20”.wc.to.0-349”.wc. ±05%.of.full.scale 0-350”.wc.to.0-75.psi. ±075%.of.full.scale SP.Accuracy. ±10%.of.full.scale

48

49

50

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