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Online Sensors

pH-sensors

A Diverse Range of Online Sensors for Accurate and Reliable Measurement

Online sensors from Hach® offer cutting-edge technology to provide you with reliable real-time data on water quality, allowing for proactive management and rapid response to potential issues. From monitoring key parameters such as pH, dissolved oxygen (DO), and conductivity to detecting contaminants, our sensors offer unparalleled accuracy and reliability.

Hach's online sensors ensure regulatory compliance and operational efficiency. With user-friendly interfaces and seamless integration into existing systems, managing water quality has never been easier.

Featured Products

pH Online Sensor

Differential pH Sensors

Increase measurement accuracy and eliminate sensor ground loops with Hach's range of differential pH instruments solutions.

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Differential ORP Sensors

Differential ORP Sensors

Online process ORP sensors provide greater reliability, resulting in less downtime and maintenance.


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Dissolved Oxygen Sensors

Dissolved Oxygen Sensors

Hach offers low maintenance, ready to use sensors for accurate measurement in a variety of ultrapure, pure, and non-pure applications including drinking water, power plants, and beverage production.



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Conductivity Sensors

Conductivity Sensors

Our conductivity sensors use innovative technology to eliminate the polarization and electrode coating problems common in harsh, industrial environments. Sensors feature plug-and-play technology to avoid complicated set-up procedures.

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Hydrogen Sulfide Sensors

Hydrogen Sulfide Sensors

Whether in water or air, the GS1440 and GS1440EX hydrogen sulfide sensors provide the direct H2S measurement you need to optimize your H2S treatment process and proactively control H2S before it causes issues.

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Suspended Solids Sensors

Suspended Solids Sensors

Digital process probes from Hach accurately measure both suspended solids and turbidity across a variety of applications.






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Hach Service Plans provide you with unique expertise to help maximize instrument uptime, ensure data integrity, maintain operational stability and reduce compliance risk.


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  • Online Sensors and Controllers
  • Sensor & Electrodes

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