Prominent DULCOTEST® Redox Sensors

Prominent DULCOTEST® Redox Sensors

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Redox Measurement

The Redox potential measures oxidants or reducing agents in a medium. The measurement of this parameter is relatively cost-efficient, however, it has also some disadvantages: These include non-selective determination of a defined oxidant or reducing agent, strong pH dependence, and the measured signal has a saturation curve with increasing concentration.

The Redox potential is a parameter that does not determine a specific oxidant or reducing agent, but will measure all agents within the sample line. The measured signal is strongly pH dependent and has a saturation curve with increasing concentration. The Redox measurement can be used as a cost-efficient alternative to direct determination of oxidants and reducing agents (e.g. via amperometric probes) or as a secondary measurement. For this purpose, the following conditions must be observed:

  • The sample line being analyzed is potential and there are no other redox active connections
  • The pH value of the process fluid remains constant
  • The expected concentration is located in the steep section of the saturation curve

Application Areas

  • Cyanid detoxication at high pH value by oxidation
  • Chromate detoxication at low pH value by reduction
  • Monitoring of disinfection effect when metering oxidants
  • Etc.

Our Program offers the following Advantages:

  • 11 types of electrodes, in different versions (electric connection, installation length, cable length)
  • Fittings for simple installation into bypasses, containers, piping, an adapter fitting allows replacement without interrupting the process
  • Measuring transmitter with display/control to send a signal to a programmable logic controller (PLC) and without display/control
  • Control devices with staged capacities
  • Integration of the control circuits into Bus systems (PROFIBUS®-DP, CANopen-Bus)
  • Easy calibration with buffer solutions

Our product family DULCOTEST® Redox Electrodes offers a large range of electrodes for the solution of your measuring task. Application ranges include not only rather simple tasks in water treatment processes but also applications in industrial process waters with higher requirements as to temperature, pressure, pollution tolerance and chemical resistance.

The production process of our electrodes is subject to strictest quality controls. It is automated in routine steps but manually affected under professional control in critical steps. Thus, we reach an optimum of reproduced quality and cost reduction for you.


  • Precise and reliable measurement, enable efficient process guidance and highest process safety.
  • Long lifetimes thanks to highest glass quality, optimized production and selection of the correct sensor. Thus, dead times and efforts for maintenance can be reduced.
  • Short stock times and short delivery times result in best-possible exhaustion of an electrode’s lifetime (weathering of an electrode already begins just after its production).
  • Special versions for installation length, cable length and plug for tailor-made process connections
  • OEM partner receive as private label.
  • Short delivery times enable short-time replacement
  • Storage in a protective tubular filled with electrolytes, which enables best-possible protection during transportation and measuring breaks
  • For detailed information on the individual sensors please see the download section.

Selection guide for electrodes

Medium Max.
° F [° C]
psig [bar]
Clear medium 140 (60) 7.3 (0.5) RHE     (swimming pool, portable water)
43.5 (3) RHES  (swimming pool, portable water) 
87 (6) RHEP-Pt-SE  (electroplating, process  water)
RHEP-Au-SE (cyanide detoxication, ozone monitoring)

140 - 176

 (60 - 80)

7.3 (0.5) RHEP-Pt-SE  (electroplating, process  water)
RHEP-Au-SE (cyanide detoxication, ozone monitoring)
176 (80) no overpressure RHEN  (high accuracy, long life)
Medium with 
solid components
176 (80) 87 (6)  RHER
77 (25) 232 (16) RHEX  (emulsion, suspension sludge)
212 (100) 87 (6) RHEX  (emulsion, suspensionsludge)