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\ ' . At the maximum. pe'ed .o.f opert,ion, at··c least 0.2 ·;;s·e'conds! .:;.:,.
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should' be : , allowed oetvteen' the centors of impulse.s',,-core:·spond.- .
ing ·to. 300 operations per m.1nute. In order tt thiS:' humb '
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'of operations POI' min.ute ma'$" be Qptained, the "antl',and t1;off" :";, .
. intervals shoulct. :be· equal'.,;Howev:r,. the .approximat. ,mi:n:bnum'
time of light change requ.1.rl§d· 'to ':or.ate the'.relayt:i:·: apout., 'l
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The maximum'·.J;'ecomntended rate of. opeNj:tio:l's : " :
. 150 pe r millu te ". . . ':' . ,.;. ' ,': .
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If the. phototube 'is ':hlOlnted:an a separatehQU81ng,..:1:t· .. :{ . ',.
may be located up .to 25 c.able·, feet; distant, aithoughstandard r .. .
. housings.ar furnished wi'tlf:,1;O fet of'cable, 'l-fh,ich,ls usually',' ':;:\:
suffiient. , Distances beyond 10 ·feet 'slow down ,·the ,pespons.e . ,'" .
'25%, and . longer times tJ:1a:n' :.those given for ope.rtio!l; must' ' .: ,
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allowed. The. 'footcandle r4tins" of the unit is then also in:
'creased to 6.5, footcandlei;L '
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E>.?fetl Control for;
Elev'ator d0ors· , .
.Pulverized fuel fur.l1..a.ces '. : '. : L
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Punch, prsses" : ' ,
Railroaa crossings .P. idustril sidings
(2) HOW Tel SELECT ::AN. APPLY PHOTO-_TROLLER§
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The first· . fundamental in apPlicBrtion Of' PhMiotroli.ercfk .
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