Page 72 JANUARY 2010 - TD 220a DEPLOYMENT GUIDE, RDCP6004. Unscrew the correct sensor at the top end plate. Loosen the set screw that goes with thesensor position. Do not unscrew the set screw completely and remove it, as it might belost.5. Pull up the sealing plug. Clean the boreholes.6. Inspect the O-ring of the sealing plug.7. Seal the borehole at the top end plate with the sealing plug.8. Put the instrument back into the pressure case and tighten the c-clamps.IMPORTANT! Make sure that the sealing plug and the c-clamps are well tightened to ensurethat no water will infuse the system. Do not overtight as this will damage the sensors and theclamps.4.8.3 Illustration of a sensor connectionFigure 4-6 Removal of sealing plug. Loosenthe set screw. Use a small bit ofpaper/cardboard to protect the top endplate.
