seth eda
ee
lie
ign Yoltam Soacds.
tet ale ee
~
:
metal corrosion,
te mtor shalt putting thea dust moaitor out cf comissisn
until
The leakage ree
actance of the tranaformer in the 4.5. unite (TMet.£ end Tubs}
was high enough to prevant excessive current in the primary so
that the short would corn throigh wht.s.t the chrcuit troaaer
opening. In the D.C. unit (TNed-d)} the excsseive current draw
Giecharzged the battery. Bakelite boards should ast be used in
She high voliage saction sf equipmen: to ne used in
areas.
The farmer prevented feeding sf the Miter pape.
which stalled the drive ator, The overheating of the motar in
sAdltion to ths must caused by excassive Sand af ty usually frose
mn tw
se mete pate
high voltage points to ground to burn the board.
ne
he
ss
ad
TixSed. Sefore being placed on Uselang, tre dust samplers vere
preset to trigger st 0.) a/b, On subsequent visits efter bursta,
the beckeround was cften greater than the tKigger setting,
In
otter ta waady the inateument for ths Soliewing event, tne
rigger
satcing necessarily had ta be railed abowe the current backorouu
Vasiwe a Oxisting contrel on the instrument permitted accurste
etjustmmat only by cumbersome trial and errop procedure
utilizing
At moat of the installations, ling volte
& portable source and gamma survey instrument, Generally, there
being insufficient time for this procedure, the setting was adjuated
te some value, only approximately imown, such that the unit
would
quency vere maintaing. at standard levels only during
the upper level wind observations, Voltages a3 low as &5 volts
were observed during maintenance visite and near the otal of the
operation conditions may have been worse due to the fuel shortage
at several stations.
not trigger in the gamma flald, Because of this, the samritas tine
Water damage caused temporary failure of several instruments.
DB.
and condensation, The former waa the greater factor and was alin
inated by placing sheds over the units. Theae sheds were usually
Constructed with the monitor packing case, supported by fowr lacs,
Tes. Tae friction clutch should be made with a reversed
thres4
80
% 1% would tend to loosen. The paper drive mtor is heavier
and faster than required, 4 smaller astor would allow the
paper
fwel supporting plate to drop lower allowing sista loading
of tha
paper. Also the slower drive motor vill eliminate over-running
ef the detent on the stop can.
inverted over the instrumsnt.
The condensation could not be stopped
but this elone did not cause any instrumant failures.
Ti-2~d.
Several mercury batteries (Mallory 308448) went bad long
ore the expected end of their life ami showed signs of leakage.
Bxoept for one case, thia occurred only in those batteries fron
|
which several celis were removed to cotain Be voltage, Evidently
the stress placed on the cella by this operation is excessive and
another method of varying 8 # should be devised. A faw of these
hetteries ware received with the polarity, 2s imiicated on ths
_ Gaaing, reversed.
The two bars supporting the recorder are not strong enough and
a
« ged on a
n the Ka
{an cutting
umdar the welcht of the recorder, pres
ba hatter: Las
in
‘their casings. (lyptal paint, which was used te insulate
rivets
from the metal tase plate did not stand up and several shorts
occurred,
THeied.
The major failures in this tyre unit occurred in the beta
The paper drive mechanism broke down in almost evary
Recowmenuad Modifications.
A method of stopping the paper after it has traveled threa
inches
-Would increase the Life of 2 filter paper roll from 8 to approxi
-
mately 14 days. At preeeat, the amount of paper
samila 13
controlled by tas radius of the takeup reel whichincreasas
whea
the ousber of samples taken. Since it is necessary to have
tho
drive set se that three inches 1s traversed with the Minimum
radias
the open space between samples becoms excessively lang aa
the roll
is used,
A rubber pinch wheel eesembly
Replacing the beta GM tube or servicing ths circuit mounted
nun
the lead shield 15 Jifficult, requiring almst 2 complete
atiunviing of the mnitor which is extremaly difficult in the
fleli. ©.
whole section should be mounted to a plug in the rear of the leui
pBheld which is easily removed without disassem
bling other parts 2f
€
ue
mEpROTS eREIYAW Og mR ee ene
&1
Lo
shich would be Simis un
@umign could be used to fix the amoun: of paper travel.
mR
section...
Pigascoagennantownst =
ater entered the instruments due both to heavy wind drives rain
for the next event could not te accurately eatabiished,
Fe eteammaaan tee
1 Lo
=e
+, na
every unis. The contribut
ing factors mere vere the tendancy of
the friation
So Sigutsn up Ggainst toe mpunting plate and
i Woltage boards, These bards were also dDaislite and
apparently the high munidity encounter.d reduced the insulation
Tesistance to the point where sufficient current flowed froa
age a
kd” rece ue ee be me ya
aaa
& fallurs comon to these unite securred
Gare muls ted Line Volta.
BR Ce cont tte TE eR aleels ceo
2
§
seme ae tt tle
eres