Liquid Handling

Dispensette ® TAUse and HandlingGeneral features of the Dispensette ® TAbottle-top dispensern Plastics in contact with media consist of high-puritymaterials such as PTFE, ETFE, FEP, and PFA.The purest sapphire is used for replaceable valves.Depending on the application, platinum-iridium ortantalum are available as spring materials.Liquid Handlingn A field-tested cleaning process before use in traceanalysis is described in the operating manual.n If contamination of the bottle contents must beavoided, we recommend using the device withoutthe SafetyPrime recirculation valve.Replaceable dispensingcartridgeIf the piston seal is worn afteran extended period of use, theentire dispensing cartridgecan easily be replaced withouttools by the user. The cartridgeis fully adjusted at thefactory, and delivered with aperformance certificate. Nocalibration is required afterreplacement.Serial dispensingFor easy serial dispensing,an optional flexible dischargetube with textured safetyhandle (not approved for HF)permits fast and precise dispensing,even into narrow testtubes. Full functionality of theSafetyPrime recirculationvalve and the safety dischargesystem is maintained afterinstallation.n The 45 mm standard thread plus the includedadapters fit most common lab bottles.n The valve block can be rotated 360° so that thebottle label always faces the user for safety.n Telescoping filling tube adjusts to different bottlesizes.n Easy disassembly for replacement of the dispensingcartridge.Recommended application rangeParts in contact withmediumOperating limitsDispensing mediumValve spring:Pt - IrValve spring:TaVarious fluoroplastics (ETFE,FEP, PFA, PTFE), Al 2O 3sapphire and platinum-iridiumor tantalum, depending ondesign.Vapor pressure max. 600 mbarviscosity max. 500 mm 2 /stemperature max. 40 °Cdensity max. 3.8 g/cm 3Acetic acid + +Ammonia solution + +Bromine + +Hydrochloric acid + +Hydrofluoric acid* + –Hydrogen peroxide – +Nitric acid + +Perchloric acid + +Phosphoric acid + +Sodium hydroxide, 30% + –Sulfuric acid + +Water + ++ suitable – not suitable* Hydrofluoric acid reacts slightly with sapphire resulting in mildly elevated aluminum values. Toreduce these values we recommend discarding 3-5 dispensings of 2 ml each before performingthe analysis.The above recommendations reflect testing completed prior to publication. Always follow instructionsin the operating manual of the instrument as well as the reagent manufacturer‘s specifications.Should you require information on chemicals not listed, please feel free to contact BRAND.Status as of: 0713/2www.brand.de31