YSI ProDSS Ammonium Sensor

The YSI ProDSS ISE ammonium sensor is a digital smart sensor featuring welded titanium construction for use with the ProDIGITAL family of instruments.

Features

  • Measures NH4 in freshwater applications
  • Depths not to exceed 17 meters (55 ft) or 25 psi
  • 3 month warranty on sensing module
List Price $679.00
$645.05
Stock Check Availability  

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.

ProDSS Smart Sensor Specifications:

Parameter
Range Accuracy* Resolution

Conductivity

0 to 200 mS/cm

From 100 to 200 mS/cm: ± 1% 

**0.001, 0.01 or 0.1 µS/cm

Temperature

-5 to 70 °C

± 0.2 °C 

0.1 °C or 0.1 °F

Dissolved Oxygen

0 to 50 mg/L

From 0 to 20 mg/L: ± 1% 

From 20 to 50 mg/L: ± 8%

0.01 mg/L or 0.1 mg/L 

pH

0 to 14

± 0.2 

0.01

ORP

-1999 to 1999 mV

± 20 mV

0.1 mV

Turbidity

0 to 4000 FNU

From 0 to 999 FNU: ± 2%

From 1000 to 4000 FNU: ± 5%

0.1 FNU

Freshwater Total Algae

0 to 100 µg/L PC

r2 = 0.999

0.01 µg/L PC

Saltwater Total Algae

0 to 280 µg/L PE

r2 = 0.999

0.01 µg/L PE

Nitrate

0 to 200 mg/L

± 10%

0.01 mg/L

Ammonium

0 to 200 mg/L 

± 10%

0.01 mg/L

Chloride

0 to 1000 mg/L Cl

± 15%

0.01 mg/L


*Reference specification for each sensor for more details on accuracy
** Range dependent

Questions & Answers
How long does the Ammonium sensor for the YSI ProDSS hold its calibration?
YSI recommends calibrating ISE sensors (Nitrate, Ammonium and Chloride) each day the probe is in use. More tips can be found in the ProDSS calibration guide, located in the documents section. 
Can the YSI ProDSS ammonium sensor be used to detect ammonia?
Yes. Ammonia is calculated from the ammonium, temperature, and pH readings. For the highest accuracy in the ammonia calculation, use a pH sensor in conjunction with an ammonium sensor during measurements. If a pH sensor is not in use, the instrument will assume the sample is neutral (pH 7) for the calculation.
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