4-20 mA Water Quality Sensors

For Environmental Monitoring and Process Control


Simplify your water quality monitoring with dependable, easy-to-use sensors compatible with any datalogger or control system that accepts analog inputs.

Explore Products
STs Series Conductivity Water Quality Sensor and Transmitter


STs Series Dissolved Oxygen Water Quality Sensor and Transmitter

Dissolved Oxygen

STs Series ORP Water Quality Sensor and Transmitter

ORP (redox)


Autonomous Data Collection

Easily collect large amounts of accurate water quality data around the world by connecting pHionics sensors with remote telemetry units.

Groundwater Monitoring

Take early action on changes in groundwater quality to protect crops or prevent harmful agricultural runoff from damaging local waterways.

Aquaculture Automation

Maximize fish size and reproduction rate by connecting pHionics sensors with SCADA or PLC systems to maintain optimal water conditions.

…and many more!

Or enhance your knowledge through our

Featured Article

The Guide to pH Drift

 pH drift is one of the most frustrating issues to troubleshoot because it can seem random and be caused by many different aspects of the environment, maintenance, and sensor design.  This guide provides steps to simplify the troubleshooting process and determine what the cause of drift is along with how to fix it.

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