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pH Sensing

pH measurement

Optical pH sensors comprise a pH indicator dye in a matrix applied to a patch, which changes color in response to analytes in its environment. A spectrometer measures the colorimetric (absorbance) response.

Accurate pH sensing allows us to monitor and fine-tune chemical processes, protect the environment, and study biological systems. Electrode-type pH meters are more familiar, but the emergence of optical pH sensors has improved measurement response time, expanded the range of chemically compatible samples, and enabled non-contact measurements.

scientist measuring liquids into test tubes

Advantages of pH Sensing

  • Sensors are ideal for the biological range (pH 5-9)
  • USP Class VI certified: Optical pH sensor chemistry meets biocompatibility standards for pharmaceutical and health products
  • Low maintenance needs: Unlike pH electrodes, optical pH sensors do not require special storage solutions
  • High resolution performance: Sensors can resolve to 0.01 pH units
  • Multiple form factors: Indicator dye chemistry can be applied to patches and cuvettes


What You’ll Need for pH Sensing

Transmissive pH measurement systems allow light to pass through the sample during measurement. Sampling options include transmissive pH patches that are used in transmissive dip probes or smart pH cuvettes. A visible range light source, general-purpose spectrometer such as our SR or Ocean HDX models, and bifurcated optical fiber complete most setups.

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