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Appendix B
GENERAL
-l.
INSTRUMENTATION DESIGN
Pressure-sensing Element
gs 5
.
n
S
n
i | Pie basic component, common to all the types of pressure gages
di bY the project, during CASTLE, except the very low pressure gage,
wasi.a@¢apsule consisting of two concentrically convoluted diaphragms,
nested together to reduce volume, and silver soldered around their
periphery; | These pressure capsules or elements were essentially identieal to those incorporated into gages used by Project 3.50 during
UPSHOL-KNOQTHOLE, (Reference 1). Briefly, during operation, air enters
the elementthroys a small pressure inle.. hole causing expansion of
the nracnteanadihd, this spring stylus soldered to the center of one
diaphragm trans 4 $ this motion and produces a scratch on a coated
glass recording)pia k.
The amplitude of tnis scratch is proportional
to.the movement of the diaphragm.
A sapphire pointed phonograph needle
soldered to the stylus arm is used to insure a fine scratch.
characteristics of theseylenents are as follows:
Diaphragm voterstee
Deflection (at Rated
Maximun--~--+------ -- she
The basic
anne enna~---IfiSpanc
ure)
ye ee ee eee9.060 inches
Minimum------------b42)3-- wae eeene9.020 inches
Linearity-------------S24---py--------9.5 percent
Hysteresis-----+---++ .--------b4--------- 0.5 percent
Natural Frequency (undamped)}
{1400-2000 eps
Rise Time----------------~+---}-------- 5 msec or less
Operating range----0-150 peréent of max rated pressure
Pressure Inlet Hole (diam.) 0.152
Les
DisMeter---+--------Variable (depeydént on pressure range)
q
The very low pressure gage uses 4
uted diaphragm, 5 3/4 inches in diameter.
gie
Tne diaphragm forms one side of the gasé
phosphor-bronze, convul-
case.
Any pressure dif-
ferential existing between the inside and outdide ofthe gage causes
the diaphraga to deflect. This deflection is trangiitted to ana
scratched on a coated glass recording blank by a stylds soldered to the
center of the diaphragm.
basic pressure elements.
B.l.2
The stylus point is the bane as used on the
en
The various pressure elements used are shown in F aire C.l.
;
|
Recording Blanks
U)
bw
The recording medium of the scratch type self-recording gages
was pyrex glass.
The various sizes and shapes are shown in Figure C.2.
56
a