In Situ Transmissive pH Sensors
 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.
Interface
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.
Features
- 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
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 |
| Drift (continuous stability): |
1% per day |
| Discrete stability (lifetime): |
50 uses or more, dispose when absorbance at pH 11 <0.1 (assumes pH1 reference) |
| Storage conditions: |
Dry or wet storage |
Setup
- Spectrometer (350-1000 nm), slit options (25, 50, 100, 200 mm)
- Light Source (350-1000 nm)
- Transmissive Probe (T300-RT-UV-VIS or VIS-NIR)
- Transmissive Probe Cap (RT-2MM, RT-4MM, RT-5MM, RT-10MM)
- pH Patches (PH-BCG-TRANS) pack of 5
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