Bruker BPHG 90 - Generator Shut-down

Operation
Z33081_00_001 53
Figure7.20:EndofBatchDeliveryProcess
7.6 GeneratorShutdown
TheBPHG90canbeleftinReadymodewithoutdetrimentaleffectstotheinstrument.If,
however,itisenvisagedthatnoparahydrogenisrequiredforaprolongedperiodoftime,it
isrecommendedthatthesystembeswitchedoff.Itisnotrecommended,however,thatthe
BPHG 90 is switched off by means of the main power switch when the conversion
chamber is cold. This could lead to pressure build up in the conversion chamber and (a
small amount of) H
2
 gas being released through the pressure safety valves in the
instrument.
Thepreferredprocedureforswitchingthesystemoffisbyfirstwarmingitupasdescribed
inthefollowingsection.
7.6.1 WarmUp
Upon terminating either of the two delivery modes, the BPHG 90 returns to the Ready
screen. When the user presses the Exit button on this screen the system will return to
StandbyfromwhichaforcedwarmupcanbeinitiatedbytappingtheWarmUpbutton.
The Warm Up procedure allows the user to warm the system up quickly to a preset
temperatureinordertoclearasuspectedconversionchamberblockage,orinpreparation
forasystemshutdown.
A forced warmup takes typically less than 20 minutes. When the Warmup button is
pressed, the system asks for a user confirmation (Warm up dialogue and information
screen [} 53]) and then proceeds to heat the conversion chamber under continuous
pumpingontheworkingvolume.