FISSION PRODUCTS OVER THE PACIFIC NORTHWEST
431
For collection of sufficient CO, for “C analysis, a new sampler
was designed which can be mounted under the wing in the nose section
of the Aero 8A-1 bomb simulator. A cross-sectional view of this sampler is shown in Fig. 3. Air is directed through a smoothly contoured
' 2-in.-diameter tube that is attached to a rotating inlet plate. Rotation
33 IN.
FIBER-GLASS
INLET TUBE
POSITION
INDICATOR (
{
CONTACT
CAM
SWITCH
|
A
|
.
DISCHARGE
|
:
INLET
TUBE
_—
ATTACHMENT SCREWS
VALVES
t
STEPPING RELAY
SB.
it
INLET PLATE
J
|
|
voit
t
CANNISTER
i
i “*—— SCREENS
AND FILTER PAPER
DRIVE MOTOR
ROTATING
=
TEFLON SEALS
CANNISTER
h
1
|
4!
|
j
:
I
|
|
|
To SCREENS AND FILTER PAPER
|
|
|
i
!
FIXED BULKHEAD
ALIGNMENT RING |
EXHAUST
é
o
+19 IN. DIAMETER —————_____»
I~
SPECIFICATIONS
MATERIALS: ALL ALUMINUM 5052 —H32 (YIELD STRENGTH, 28,000 LB; ULTIMATE, 33,000 LB)
DRIVE MOTOR: 6 TO 24 VOLTS DIRECT CURRENT; GEAR REDUCTION, 1 TO 3 RPM
STEPPING RELAY: 24 VOLTS DIRECT CURRENT
CANNISTER LOAD: INERT MOLECULAR SIEVE AND FILTER PAPER
LOADED OPERATING WEIGHT: ABOUT 60 LB
Fig. 3—Cross-sectional view of wing-mounted air sampler.
of this plate aligns the inlet tube with one of the six ports located in the
fixed bulkhead. Three ports connect to direct overboard discharge
tubes. Each of the remaining ports is the inlet to one of the three cylindrical cannisters. Individual exhaust from the cannisters is through
a spring-loaded flap valve into the ambient airstream. These cannis-
ters are loaded with an IPC 1478 filter sandwiched between two wire
screens in the front and with approximately 8 lb of Linde type 4-A molecular sieve material for CO, collection behind the screens and filter.
The drive motor, which rotates the inlet plate, is powered through
a stepping switch by the aircraft’s 28-volt d-c system. For operation
of the sampler in flight, the main power switch in the aircraft cockpit
is turned on. The drive motor rotates the inlet plate until the inlet tube
is aligned with a cannister port. At this time one of the three doublesi as