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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.

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First Claim