Barton Model 202E Differential Pressure Recorder

The Barton Model 202E single DP Flow Recorders measure and record system operation parameters including gas and liquid level in a vessel, and other system variables that can be measured by differential pressure and static pressure methods.
The main components of Barton Model 202E are:

• Differential Pressure Unit

This part Differential Pressure Unit (DPU) actuates the recorders, the DPU is a dual bellows assembly enclosed within pressure housings.

•  Adjusting Pulsation Dampener

This part of DPU

• Recording Mechanism

This part as a linkage and pen system that permanently records data. It converts mechanical inputs from the DPU and static pressure element to transcribe lines on revolving chart. All material parts of the recorder mechanism are made of stainless steel.

• Static Pressure Element

This element measure static pressure in a piping system from 0 to 30 inches of Hg vacuum or from 0 to 10,000 psi. The sensor element is a bourdon tube consisting of a slightly flattened cross-section of tubing coiled into a helix or flat spiral. The outer end of the tubing is seald and attached to a drive arm, which is attached to the static pressure connection tubing.
Generally, Barton recorder require no maintenance other than replacement of the chart, replenishment of the ink, winding of the spring-wound chart drives, and occasional calibration. In addition, the operator should periodically check the door seal for wear and the pressure fittings for tightness:

1. Differential Pressure Pen Calibration

- Make sure chart plate is on same plane and flush with hub flange, the chart must be flat with the hub locked. Also, make sure the pens and pens arms are correctly connected and that they do not interfere with one another.
- With a chart locked into place, move the pen from zero to full span and back to ensure that the pen travels along the time line. If adjustment are needed, loosen the two pen mount screws, adjust the pen mount position until the pen follows the time line, then tighten the pen mount screws
- Disconnect the differential pressure drive link from the range arm. Move both differential and static pressure pens to full span. Adjust the static pen so that pen around 7-15 minutes apart by adjusting the static pen arm mounting location on the pen arm shaft assembly. Move both pens to the 50% indicating position. Ensure that the pens don't interfere with one another. Adjust static pens as necessary, don't alter the differential pressure pen once it has been adjusted to the time line
- Ensure that there is enough pen pressure against the chart to produce a continuous line. If necessary, adjust the pen pressure by bending the arm in the required direction.
- Unlock the flow recorder hub clip. Remove the chart and chart plate
- Mount a calibration chart into the flow recorder hub. Lock the chart in place. Move over range stops out of play
- Apply 50% differential pressure to the high-pressure side. Arrange the differential pressure linkage. Set a 90 deg angle between the drive arm and link. By varying the length of the link, set a 90 deg angle between the range arm and link. Slip the range arm to 50% on the chart
- Remove the 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 and proceed to step b. if the pen deviates more than 10% from zero, make adjustment 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 necessary adjustment by turning the range arm adjust screw counterclockwise if the pen is slightly under ranged and clockwise if the pen is slightly over ranged. Repeat zero and 100% adjustment until calibration at these points is achieved.
c. Apply 50% pressure, the pen should be on the 50% chart line. If the pen is to low, lengthen the linkage to make a correction 40 times as great in the high direction. adjust the pen to 50% as in step a, ensure all linkage screw 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, 25,50,75 and 100% ascending and descending) must be run

Manual Book Barton Model 202E NUFLO, will be posting next...