| 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 Probes 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.
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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