
10
−aceticacid, 10 - 50 %
−tape water for rinsing
Warning
Disconnect apparatusfrom the mainsby pulling plug out ofthe socket beforecleaning.
Thereisriskofcorrosive burns. Wearprotecting clothing, glovesand gogglesduring
cleaning. Disposeofthe acetic acid in accordance with approved procedures. Foryour
personal safety werecommend disconnecting the mainssupply beforecleaning. Keep the
reservoirbottle (2) connected. Allowthe waterstill to cool downcompletely. Weare
recommending markthe apparatuswith table forinstance: “Do not switch on!Cleaning with
acid”.
To cleanthe evaporator
−Drainthewater outoftheevaporator throughtheoutletvalve(9) after theapparatushas
cooled downcompletely
−Closethevalveagain
−Hangtubingoftheoutletvalve(9) into thevesselfor thedisposaloftheaceticacid. For
safetyreasons, place thevesselinareceivingtank.
−Screw thescrew cap (5) tightly onto thepressurecompensationopeningofthelevel
tube.
−Insertthefunnelinto thefree endofthetubingleadingfromtheoverflowtubing(8). If
necessary, diptheendofthetubinginto hotwater (approximately 80°C) for about3
minutesbeforefitting. Check thatfunnelfitstightly.
−Supportthefunnelinthestand. Thebottomofthefunnelconemustbelevelwiththe
distillatedraintube(4) (view pictureonthispage)
−Slowly pour inapproximately 1litter ofaceticacid10 - 50 %, usingthegraduated jug.
Fill thefunnelup to nomorethanonethirdofitscapacity, to avoidspilling. Fill the
evaporator up to nohigher thanthelower edge oftheofthedistillatedraintube(4). To
regulatethefillingrate: Place thefunnelinto ahigher positionto expeditethefillingof
theevaporator;returnthefunnelto alower positionto controltherateofadditionof
acidasitapproachesthelower edge ofthedistillatedraintube, whichpointmustnot be
exceeded.
Note
Take carethat no acid dripsinto the reservoirbottle.
Ifacid drip into the reservoirbottle, carefully rinsethe bottle and the bottle top.
−Assoonasthedepositshavedissolved draintheaceticacidoutoftheevaporator
throughtheoutletvalve(9) to thevessel.
−Closetheoutletvalve(9).
−Hangoutletvalvetubingback into thesink.