Product Description

Hydro Residual Chlorine Analyzers makes use of the Amperometric method to determine residual levels in the sample water.
Basically, Hydro Instruments offers two models of analyzers:

Model RAH-210 (Open Cell Type)
The measurement cell consists of large Gold and Copper electrodes in direct contact with the sample water. The measurement is continuous, not relying on sample and hold methods, thereby allowing for better process control. A continuously driven cleaning system is employed to prevent the build up of impurities on the surface of the electrodes and reduce the need for maintenance.

The Series RAH-210 Free Chlorine Analyzer is available with pH & Temperature compensation performed in software. For applications with stable pH, the known pH value can be manually input for software compensated residual analysis. A gravity driven buffer feed system is also available to inject the required chemicals for measuring Total Chlorine, Chlorine Dioxide, Iodine and Bromine. For Free Chlorine measurement, vinegar can be used as the pH buffer reagent. The measurement range is field adjustable through menu driven digital programming.


Model RPH-250 (Probe Type)
The Series RPH-250 Analyzer makes use of the Amperometric method to determine residual levels in the sample water. The measurement is continuous, not relying on sample and hold methods, thereby allowing for better process control. The measurement probes offer easily replaceable membrane caps.

The Series RPH-250 Chlorine Analyzer is optionally available with pH compensation performed in software. The Chlorine measurement range is field adjustable. This analyzer includes a complete PID control program as a standard feature.

Because Chlorine residual measurement probes are sensitive to pressure and flow fluctuations, the RPH-250 is provided with everything needed to supply a steady sample water pressure at a consistent flow rate. A plastic pressure regulating valve with an attached pressure gauge is included with each unit. An integrally designed flow control valve and graduated metering tube make setting and maintaining the sample flow a snap.


All Hydro Instruments products are fully and truly made in the USA.
Hydro Instruments is ISO-9001 (2008) Certified Company, CE Mark Europe Certified (Safety), Chlorine Institute USA Approved Brand.
Hydro Instruments Residual Chlorine Analyzers has become globally recognized as the most ruggedly designed, highest quality and longest lasting available.