31Englishwww.novasina.com9.6 Upgrade the LabTouch-awAs different versions with more or less features are available, the user has thepossibility to upgrade the system making those new features accessible. Pleasecontact the Novasina representative to learn more about the different features ofthe basic and the advanced version.• To activate the new features, please proceed as follows:• Go to "System settings" -> "Maintenance" -> "Set options code"• Take a picture of the screen showing the set option code and send ittogether with the license upgrade order to your local Novasina represen-tative.• Press [No] to close the active window.• As soon as you have received the new option code, select again themenu point "Set options code". Now press [Yes] and enter the new code.• Afterwards mount the little sticker with the new license code (included inthe delivery of the needed license code) on the bottom of the LabTouch-aw and keep the new license in a safe place where it can be foundwhenever needed. The new license code is needed again if the optionhas to be reactivated after a complete loss of data (i.e. exchange of mainboard).9.7 Communication InterfaceNote: This function requires the "advanced" version of LabTouch-aw. If you have abasic version, please contact your local Novasina distributor to purchase a licenseupdate.• Factory default setting for the communication with the optional NovalogMCsoftware is the USB interfaceNote: USB functionality is implemented in NovalogMC version V2.20 and higher• Please change settings as follows if a communication via RS-232 interface isrequired. Go to "System settings" -> "Maintenance" -> "Interface for computerconnection" an choose RS-23210. Maintenance The following chapter describes the main maintenance task which can be perfor-med by the user himself.10.1. Cleaning of the instrumentFor cleaning the instrument just use a soft tissue and pure water. If necessaryuse mild detergents in addition. NEVER use cleaners containing aggressive and/or oxidizing chemicals . Make sure you dry the chamber thoroughly dried aftercleaning to avoid wet residuals and hence an influence on the coming water activitymeasurements. If the outer parts need to be cleaned, be aware that some areasof the instrument are not sealed and water can enter the instrument. Best way isto use a wet tissue as well to remove dirt and dust.Caution !Before cleaning, switch off the LabTouch-aw and disconnect it from the mains.