In situ transmissive pH sensors

/ Sensors systems

The new transmissive pH Probes from Ocean Optics

Use a proprietary sol-gel formulation infused with a colorimetric pH indicator dye. This material is coated onto our exclusive patches to reflect light back through the central read fiber or to transmit light through in order to sense the color change of the patch at a specific wavelength.

While typical optical pH sensors are susceptible to drastic changes in performance in various ionic strength solutions, Ocean Optics’ sensory layer has been chemically modified to allow accurate sensing in both high and low salinity samples.

  • Proprietary organically modified sol-gel formulation engineered to maximize immunity to ionic strength sensitivity
  • Compatible with some organic solvents (acetone, alcohols, aromatics, etc.)
  • Sol-gel material chosen over typical polymer method, allowing for faster response time, versatility in the desired dopants, greater chemical compatibility, flexible coating and enhanced thermal and optical performance
  • Indicator molecule allows high-resolution measurement in biological range (pH 5-9)
  • Simplified algorithm takes analytical and baseline wavelengths into account to reduce errors caused by optical shifts
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At a glance
pH range 5 – 9
temperature range -5°C / +70°C
transmissive accuracy ≤ 1% of reading across range
transmissive resolution 0.02 pH
transmissive response time 30 seconds
Calibration requirements 3 buffers
Sterilization Gamma, EtO, Autoclave
Chemical compatibility Aqueous, alcohols, some organic solvents, peroxides, ammonia, sodium hypochlorite
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The transmissive pH patches from Ocean Optics can be used with a desktop system as well as with the Jaz handheld spectrometer suite. The desktop system uses a module in our SpectraSuite software that allows for simplified calibration, convenient pH readings, customizable data logging and comprehensive exportation of data and calibration information. These disposable patches can be used with our DIP probes.

For field measurements, the handheld Jaz offers an easy and portable solution. Jaz’s SD card runs a script that allows you to use the factory calibration or a complete calibration. It also shows live pH values and gives you the ability to save data directly to the card.

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