User Guide

20
Clearscan™ Recorder Series - Operating and Service Manual
leaks. Release pressure.
7. Apply 50% full rated pressure of the bourdon and set the coil lever to be absolutely vertical by loosening the coil
lever clamp screw and moving the coil lever appropriately. Re-tighten the clamp screw.
8. Adjust the length of the horizontal link if necessary to make the pen read on the mid scale line of the chart at 50%
full rated pressure. Re-tighten the linkage screws.
9. Release pressure to zero, position pen to read correctly on chart either by using small adjustment to pen plate
screw or if large adjustment change length of horizontal link.
10. Apply 100% rated pressure, if pen does not read correctly on chart, adjust ratio post on pen mechanism by
slackening the lock nut sufficiently to move the ratio post. If the pen reds low, move the ratio post upwards and if
the pen reads high move the ratio post downwards. This changes the pivot distance and affects the amount of pen
travel, only make small adjustments and observe the change in pen travel distance.
11. Repeat steps 9 and 10 until pen reads accurately at zero and full span of the chart.
12. Apply 50% full rated pressure. If pen does not read correctly i.e. mid scale of chart, adjust the coil lever and
reposition the pen to mid chart reading by adjusting the horizontal link length accordingly. If the pen reads low at
mid chart, move the coil lever to the left i.e. up-scale and if the pen reads high at mid chart move the lever down
chart. Re-tighten all screws. Note, as a guide if the pen reads 1 division in error move the coil lever approximately
8 divisions to correct the error.
13. Repeat from step 9 until zero, full and mid chart readings are accurate.
14. Re-tighten all adjustments especially the ratio post locknut without disturbing the adjustment settings. Ensure all
readings are satisfactory after re-tightening.
15. Remove calibration chart plate arrangement and rebuild the recorder for re-installing to plant.
Fig. 6 Typical Pressure Calibration Setup