Here are some questions we frequently get asked, if you don’t find your answer here, please contact us
The GW50 sensor just measures Nitrate in the form of Nitrate Nitrogen (N03-N) and the temperature of the water when submerged.
The GW50 can be used in some rivers and streams, where interferences like turbidity, Dissolved Organic Carbons and biofilms are not in excessive levels.
Yes, we sell the GW50 sensor mounted into a carry case with a 12volt battery to be utilised as a portable Nitrate sensor.
The GW50 has an inbuilt datalogger that has 16Gb storage that can be manually downloaded, or can be connected to a third party datalogger or telemetry device via SDI-12 or Modbus RTU RS485 protocols.
+/- 0.3 ppm or +/-5% whichever is greater when measured against standard. Excessive non-nitrate interferences as described above can impact negatively on the calibration
0 – 50 ppm NO3-N without changing the optical path length in low interference water.
The GW50 measures Nitrate Nitrogen (N03-N), however by multiplying the result by 4.4268 to get Nitrate (NO3).
The GW50 sensor can be fitted with a pump cleaner which creates a jet of water through the optical tube to clean the sensor, and increases the time between manual cleaning visits. Manually cleaning the sensor is completed with a brush (supplied with the sensor).
The sensor doesn’t require ongoing calibrations over the life of the sensor, unless it requires a site specific calibration for a difficult water matrix.
The GW50 can work in these applications where salinity of the water is increased. There are many examples of coastal saline aquifers where the sensor will perform well. Marine or estuarine applications are not possible as typically there is a range of organic particles and other non-nitrate interferences that are not able to be compensated for.
The GW50 sensor can have up to 50m of cable, and be submerged up to 20m below the water surface (2 Bar). We can produce a higher pressure sensor on request.
