Spectrophotometric system using a pH/ISE meter for calibration
US5694206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1996 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Mar 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/8507
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectrophotometric system uses an immersible spectrophotometric probe that can be directly interfaced to a pH/ISE meter for calibration and read-out. The probe contains a light source, a photodetector, and interface circuitry for converting the signal from the photodetector to an output voltage within a predetermined range suitable for the pH/ISE meter (e.g., 0-1.8 volts). The probe housing can also include a sample chamber to provide a predefined optical path from the light source through a portion of the sample fluid to the photodetector. An optical filter can be included in the optical path to allow measurements within a selected wavelength range. The pH/ISE meter receives the output voltage from the probe, applies a calibration function, and displays the resulting value. In the preferred embodiment, the probe is designed as a unitary structure that is plug-compatible with most conventional pH/ISE meters. This allows the present spectrophotometric probe to be used interchangeably with conventional pH probes and other ISE probes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.