61
Specifications
Ammonium - NH
4
Units
mg/L-N, millivolts
Temperature
Operating
Storage
0 to 30˚C
0 to 30°C
Depth
0 to <55 ft (0 to <17 m)
Range
0 to 200 mg/L-N
Accuracy
±10% of reading or ±2 mg/
L-N, whichever is greater
Response
T63<30 sec
Resolution
0.01 mg/L
Sensor Type
Ion-selective electrode
Conductivity
<1500 μS/cm
Nitrate - NO
3
Units
mg/L-N, millivolts
Temperature
Operating
Storage
0 to 30˚C
0 to 30°C
Depth
0 to <55 ft (0 to <17 m)
Range
0 to 200 mg/L-N
Accuracy
±10% of reading or ±2 mg/
L-N, whichever is greater
Response
T63<30 sec
Resolution
0.01 mg/L
Sensor Type
Ion-selective electrode
Conductivity
<1500 μS/cm
Chloride - Cl
Units
mg/L-Cl, millivolts
Temperature
Operating
Storage
0 to 30˚C
0 to 30°C
Depth
0 to <55 ft (0 to <17 m)
Range
0 to 18000 mg/L-Cl
Accuracy
±15% of reading or ±5
mg/L-Cl, whichever is
greater
Response
T63<30 sec
Resolution
0.01 mg/L
Sensor Type
Ion-selective electrode
Salinity
30 psu
NOTE:
Qualification testing for chloride was
performed in a stirred calibration solution. Due to
the solid state nature of the chloride ISE, the sensor
exhibits moderate flow dependence. Mitigation can
be achieved by stirring
during calibration.
ISE Precautions
•
ISEs should only be used in freshwater environments only at depths of less than 17 meters and less than 25 psi.
•
ISEs are intended for sampling purposes and must be calibrated frequently due to sensor drift.
•
ISEs can be used in long-term deployments for qualitative trends; however, the user should be aware that drift is almost
certain to occur. The extent of the drift will vary depending on the age of the probe, the flow rate at the site, and the quality
of the water. Sensor data should be compared to that of grab samples throughout the monitoring period to note drift.
•
The typical accuracy specification for an ISE refers to sampling applications where only minimal time has elapsed between
calibration and field use.
•
Users may find it useful to swap their ISE after 30 days of deployment with a freshly calibrated sensor. The calibration is
retained inside the ProDSS digital smart sensor, so it can be calibrated in the lab and installed in the field.
Sensors, Calibration, and Maintenance