YSI ProDSS Ammonium Sensor
Features
- Measures NH4 in freshwater applications
- Depths not to exceed 17 meters (55 ft) or 25 psi
- 3 month warranty on sensing module
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
The ProDSS ion-selective electrode (ISE) ammonium sensor uses a silver/silver chloride wire electrode in a custom filling solution. The internal solution is separated from the sample medium by a polymer membrane, which selectively interacts with ammonium ions. When the sensor is immersed in water, a potential is established across the membrane that depends on the relative amounts of ions in the sample and the internal solution. This potential is read relative to the Ag/AgCl reference electrode.
Ammonium is calculated from the pH, salinity, and temperature readings. If a pH sensor is not in use, the instrument will assume the sample is neutral (pH 7) for the calculation. If a conductivity sensor (salinity) is not in use, the instrument will use the salinity correction value entered in the ammonium sensor calibration screen for the calculation.
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