AFT-pH
The Autonomous Flow Through Instrument pH (AFT-pH) has the following characteristics:
- Measures pH in the 7-9 range (Salinity 25-40)
- Designed to accurately measure pH of flowing seawater or individual samples
- Based on the same technology as the SAMI-pH
- Packaged to be plumbed into a sea line on a research vessel or can be used for bottle samples in the lab.
- Once programmed and launched, the AFT-pH can run autonomously or while connected to a PC if real-time data is required
- Logs own data
- Can support other external instruments
- Uses a highly accurate colorimetric reagent method
- Accuracy and precision: +/- 0.003 pH units and < 0.001 pH units
- Long term drift < 0.001 pH units over 6 months
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AFT-pH Performance Parameters
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| pH range | 7-9 |
| Salinity range* | 25-40 |
| Response time | 3 minutes |
| Duration of use | 15,000 measurements on one reagent bag |
| Accuracy (based on CRM intercomparison) | +/- 0.003 pH units |
| Precision | <0.001 pH units |
| Long term drift | <0.001 pH units over 6 months |
| Thermistor accuracy, precision | 0.1° C, +/- 0.01º C |
| Dimensions of housing | 25.4 x 30.5 x 14 cm |
| Weight in air/seawater | 7 kg |
| * Extended range possible, please contact us with questions. If salinity varies significantly (+/-1) the AFT can use thermo-salinograph data for correction. |
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