Abstract: An on-site monitor is disclosed for providing automatic measurements of chemical concentrations in a liquid or gaseous environment. The opto-electronic monitor has an extended probe, which can be inserted into the liquid or to be in contact with the ambiance, comprising a indicator chamber for continuously supplying fresh indicator material, a light source, and a detector. The light source and the detector are either embodied outside of liquid or into the extended plastic probe inside the liquid. A delivery unit, which is activated by a timer, delivers a small amount of indicator material into the liquid or a sampling cavity. The indicator material reacts with the ions in the liquid automatically. The light source has a wavelength which matches with the indicator's absorption wavelength and the detector measures the transmission (or reflection) through the indicator material or solution.

Abstract: A personal identification system for use with fingerprint data in security sensitive transactions is disclosed. The systems performs according to the following steps: generating an access file for specifying a plurality of different comparison ratio ("CR") levels with each level corresponding to an acceptable transaction; receiving the requester fingerprint data and its accompanying request parameters; comparing the requester fingerprint data with one of a plurality of fingerprint data in a master file corresponding to the account upon which a transaction is requested; generating an AR/RR based on result of comparison; evaluating the request for transaction and the AR/RR using the access file; if the AR/RR is acceptable for the requested transaction, granting the request after successfully passing additional authentication tests, and if the AR/RR is not acceptable for the transaction, entering at least one exception routine for additional authentication.