
Part 3. Basic knowledge about this freeze dryer
1. Thereare5workingstagesinthefreezedryingprocess.
Ittakesafreezedryer24‐30hourstofinishthecompleteprocessincluding:
Pre‐freeze,ColdTrapCooling,VacuumPumping,DryingandTemperaturekeeping.
Totalfreezedryingtime(24‐30hours)dependsonsugarcontents,oilcontents,water
contents,sizeofthematerials,androomtemperature.
If‐45Cdeepfreezerisavailable,pleaseuseittopre‐freezethematerialsforabout9
hourssothefreezedryercanskipthepre‐freezestage(setpre‐freezetime:1minute)
toreducefreezedryer'stotalworkingtimetoabout18hours(Coldtrapcooling
needstobestartedbeforethepre‐frozenmaterialsareloadedintothechamberto
coolthechambertolowtemperaturerequestedforthenextstage‐vacuumpumping)
2. Theworkingstageindicatorkeepsflashingineachstageallthetime.Thisflashingisnormalanddoesnotmeanany
alarm.
3. Thereare2controlmodesforthisfreezedryer:VacuumControlandProgramControl.
Bothmodessharethesamesettingsinthefirst3stages(pre‐freeze,coldtrapcoolingandpre‐vacuum)buthave
differentsettingsatdryingstage.
VacuumControlmode:Parametersatdryingstageispresetandtheuserisnotallowedtomodifyparameters.
ProgramControlmode:Parametersatdryingstageisnotpresetandtheuserisallowedtomodifyparameters
accordingtodifferentmaterials.
ProgramControlModeisrecommendedbecausethismodecanbeusedforallthematerialswhileVacuumControl
Modeisnotsuggestedforsomematerialssuchasmilkandflowers.
4. Aparametersettingchartisofferedbyusaccordingtoourtestsondifferentmaterials.Theusercantrytomodify
it afterthebestparametersettingisfoundaftersometrialrunning.
5. Afterstarted,thefreezedryerandvacuumpumpcanrunautomaticallyaccordingtothesetparameters.
6. ThevacuumpumpdoesNOTstartatthefirst2stages(pre‐freeze,coldtrapcooling).Itwillbestarted
automatically fromvacuumpumpingstageandwillkeeprunninginworkingstatusuntilendoffreezedrying
(exceptitisstopped bytheuser).
7. Afterstarted,thevacuumpumpwillinitially be a little noisy(about60‐70dB),
togetherwithwhitesmokedischargefromoutletofthevacuumpump.Thiswill
lastforafewminutes.Itisnormal.
Afterthat,noisewillbereducedandwhitesmokewilldisappear.
Itisnormalthatthevacuumpumpfeelshotallthetime.
8. Thereare3workingstatusdisplayedonthemainmenu:
NormalStatus VacuumAlarm PleaseRemoveMaterials
Referto8‐2:
Refertopoint9forsolution:
“HowtoEliminateVacuumAlarm”
Indicatingthefreezedryerisworking
ingoodcondition.