SeaFET Ocean pH Sensor
AVAILABLE NOW! The SeaFET Ocean pH Sensor was developed by Dr. Kenneth Johnson of the Monterey Bay Aquarium Research Institute (MBARI) and Dr. Todd Martz of the Scripps Institution of Oceanography, University of California San Diego. Satlantic is collaborating with MBARI and Scripps to make the instrument commercially available to researchers.
The sensor element of the SeaFET is an ion sensitive field effect transistor (ISFET). This class of device has been used for pH sensing in industrial processes, food processing, clinical analysis and environmental monitoring. The advantages of the ISFET include robustness, stability and precision that make it suitable for ocean pH measurement at low pressure.
The SeaFET reports pH determined potentiometrically in two different ways. The ISFET potential is measured against a reference electrode bearing a liquid junction (internal reference) and against a solid state reference electrode without a liquid junction (external reference). This approach provides the user with the ability to quality assess instrument performance and ultimately achieve a greater understanding of the state of acid/base equilibria in seawater.
Preliminary Specifications
| Measurement Range | 2 - 12 pH |
| Initial Accuracy | 0.01 (estimated) |
| Typical Stability | 0.005/month (estimated) |
| Precision | better than 0.001 |
| Internal Memory | 2 GB |
| Internal Power | 10.5 V; 19.8 Ah |
| Communication | RS-232; 9.6 - 115.2 kbps |
| Weight | 4.5 kg in air; -1.9 kg in water |
| Dimensions | Diameter 11.4 cm (4.5"); Length 40.6 cm (16") |
| Maximum Depth | 70 meters |
| Temperature Range | 0 to 55 deg C |
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The Satlantic SeaFET Ocean pH Sensor comes complete with SeaFETCom, an interactive graphic software application. Connect the SeaFET to your computer via the supplied USB programming cable to enjoy these SeaFETCom features:
- Review and modify SeaFET operational settings
- Schedule SeaFET data collection activity
- Manage and retrieve logged SeaFET data
- View SeaFET data in real time
- Reprocess SeaFET data and graph results
SeaFETCom provides all the tools necessary to configure and operate your SeaFET ph sensor for any deployment scenario. Manage on-board data storage, processing, and collection modes. Set up real time data streaming via USB or RS-232. Capture and plot data in real time for pre-deployment checks or interactive profiling casts. Re-process logged pH data using ancillary temperature and salinity inputs for improved accuracy.
Download SeaFETCom 1.0.0 (coming soon)
- Hofmann, G. E., J. E. Smith, K. S. Johnson, U. Send, L. A. Levin, F. Micheli, A. Paytan, N. N. Price, B. Peterson, Y. Takeshita, P. G. Matson, E. D. Crook, K. J. Kroeker, M. C. Gambi, E. B. Rivest, C. A. Frieder, P. C. Yu, and T. R. Martz. (2011) High-Frequency Dynamics of Ocean pH: A Multi-Ecosystem Comparison PLoS ONE 6(12): e28983. doi:10.1371/journal.pone.0028983 Read Now
- Kroeker, K. J., F. Micheli, M. C. Gambi, and T. R. Martz. (2011) Divergent ecosystem responses within a benthic marine community to ocean acidification Proceedings of the National Academy of Sciences (PNAS) 108(35), 14515-14520 doi:10.1073/pnas.1107789108 Read Now
- Matson, P. G., T. R. Martz, and G. E. Hofmann. (2011) High-frequency observations of pH under Antarctic sea ice in the southern Ross Sea Cambridge Journals Online 23(6) 607-613 doi:10.1017/S0954102011000551 Read Now
- Yu, P. C., P. G. Matson, T. R. Martz, and G. E. Hofmann (2011) The ocean acidification seascape and its relationship to the performance of calcifying marine invertebrates: Laboratory experiments on the development of urchin larvae framed by environmentally-relevant pCO2/pH Journal of Experimental Marine Biology and Ecology 400, 288–295 Read Now
- Martz. T, Connery J.G., Johnson, K.S (2010) Testing the Honeywell Durafet® for seawater pH applications Limnol. Oceanogr 172-184 doi:10.4319/lom.2010.8.172 Read Now
COMING SOON!
