Applications

Water Quality

Conductivity, pH, dissolved oxygen, turbidity, chlorophyll, level and flow, in multiparameter probes and loggers.

From a few drops on a pocket meter to a probe left in a well for months, the right instrument depends on where the water is and how often you need to measure it.

The problem

The water in a river, a well or an aquaculture tank changes through the day and with rain, and a single sample only shows that moment. That is why it is measured in two ways: as spot checks in the lab or in the field, and continuously, with the sensor in the water.

The variables

pH, ORP and ions such as nitrate and ammonium
conductivity, salinity, TDS and resistivity
dissolved oxygen, turbidity, chlorophyll and dissolved carbon dioxide
temperature, level, depth and flow

How to choose

For spot analysis, there are pocket and benchtop meters; in the field, portable probes for profiles and probes that log on their own battery. Fixed sensors with SDI-12, 4-20mA or Modbus outputs connect to data loggers that transmit over cellular, Wi-Fi, LoRaWAN or radio links, with solar power as an option. For aquaculture, some systems switch relays. Also compare field-swappable sensors, automatic cleaning and titanium bodies for great depths.