tubing length is negligible for large tubing diameters ( > 1/8 inch 

 inner diameter). The length of small diameter nylon tubing is the 

 same for each side or a transducer.) This effect was never tested 

 exhaustively in the laboratory, but one possible such occurence is 



r- 



Miiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiinii 



■■■ Arm Chamber Pressure ■ 





E 







I 







i 



» 





i 



c '; ■ 





~ 







i 



1 





z «> 



- E 



m 





i " 



1 t ^Blltl 



\ 



= 







= 







z 





1 



= 



' 



' 



E 



■ ■ 

 A 





i 







= 





HIIIINIIIN 



lllllllllllllllllllllll 





(.0.25 psi/mrut 



ATM 



{0.04 ps id/mm) 



FIGURE V-A: Strip chart recording illustrating possible 

 existence of air in arm side of dP4. A) arm sensor 

 loaded; B) arm and center sensors communicate to 

 establish zero differential pressure; C) both sensors 

 bled simultaneously, arm side shows slight lag. Chart 

 speed: 5 mm/sec. 



