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platform. ' 



12. The arm line to be filled is lifted above its transducer and 

 the filling process is repeated. (Figure D-2.) 



13. After each arm line is filled, the stack is positioned 

 upright to fill the absolute transducer. 



lA. The absolute transducer has no bleed port, so the nylon 

 tubing is removed from the transducer and the port filled to 

 overflowing. Fluid is then poured into the absolute line's sensor 

 housing until it streams out of the bottom of the nylon line. 

 While it is still flowing, the line is inserted into the pressure 

 port and secured. The housing is then sealed with the elastomer 

 diaphragm and ring as usual. 



15. The exterior tubing should be flexed and the assembly 

 re-positioned and inspected several times to ensure that no air 

 has been trapped in the lines. It should then be placed in 

 sunlight or a warm temperature — with the isolation diaphragms 

 above the transducers — to allow any small bubbles in the fluid 

 to appear. 



16. Air bubbles that appear can be eliminated by removing the 

 copper-nickel ring and elastomer, adding more fluid to the housing 

 and then re-sealing. 



17. Once the syst^em is air-free, the instrument is ready for 



