Abstract: A method and apparatus for monitoring usage of liquids of high value or sensitive nature which are applied in repeated small controlled volumes are provided by monitoring and recording parameters including the number of applications, purging, priming and cleaning steps and the usage of liquid supply and circulation pumps. The monitored parameters present a record of the total liquid usage. The recorded usage of the liquid pumps can be cross-checked with the volumes indicated by the other parameters so as to highlight any disagreement between the respective indications of total liquid volumes employed, thereby alerting the user to possible operating problems and permitting prompt remedial action to be taken.

Abstract: The present invention relates to a photoluminescent adhesive tape comprising a photolumninescent agent, two exposed adhesive layers and an intermediate backing layer. The invention also describes a method for using such an adhesive tape that allows recognition of an adhesive tape on a substrate by exposing the adhesive tape to electromagnetic radiation and detecting a responsive radiation with a photocell. By utilizing this method, the invention offers a method for attachment of two substrates to one another which is of improved reliability and efficiency.