Exceptionally Low Drift

5 Times Longer Life

Non-poisoning Reference

REFEX™ pH and Redox/ORP Sensors are manufactured in a variety of different styles and are suitable for use in many industrial processes where they can be applied to both to extremely harsh or general purpose applications. At the heart of every REFEX sensor is a unique non porous REFEX™ reference system giving the ultimate in high quality performance, stable readings and accurate pH measurements. REFEX sensors last many times longer than conventional electrodes with porous junction reference cells and exhibit minimal drift – REFEX sensors truly are the utopian low maintenance sensor that industry has craved after for many years.

REFEX sensors are available in a industry standard sizes and will retro-fit to your existing systems and housings perfectly. For those specific requirements, REFEX will design and manufacture unique sensors to customer specifications.

pH and ORP Combination Probes

REFEX combination probes are available in industry standard sizes and designed to fit in any existing or new “socket” where pH or ORP measurement is made.


REFEX combination sensors can be used in all applications, particularly those where fouling or poisoning conditions exist. REFEX sensors have a usable lifetime of 5 times longer than conventional sensors. The REFEX reference utilizes a patented, highly stable, non-porous polymeric interface instead of the traditional porous liquid junction as used by conventional reference electrodes. The active reference area is the whole of the outside surface of the electrode and this super large contact area means that electrode performance is supremely resistant to coating. Poisoning effects such as drift and slow response are eliminated because the polymeric reference material is conductive to ions but not porous; the reference operates electrically but electrolyte and process fluids are not exchanged.

» pH/ORP Combination Probe Line-up

12mm Separates – pH, ORP and Reference Probes

REFEX 12mm separates are available in all industry standard lengths and a variety of connector/integral cable styles to ensure they will fit in any 12mm “socket” where pH or ORP measurement is made.  REFEX sensors work will all popular pH/ORP transmitters with high impedance inputs.

REFEX reference sensors are a tremendous upgrade to traditional porous/flowing junction reference probes and can be used in all applications, especially those where fouling or poisoning conditions exist. With lifetimes expected to be at least 5 times longer than traditional designs, REFEX reference electrodes represent significant savings in maintenance and replacement costs.

REFEX sensors are available in a variety of packages to suit all pH and ORP applications:

  • pH glass sensors
  • Platinum ORP sensors
  • Reference sensors

» 12mm Separate Probe Line-up

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What Exactly is REFEX?

REFEX reference junctions are manufactured from an electrochemically conductive, salt loaded, polymeric matrix. When installed inline, there is no porous junction to allow liquid contact between process fluids and the internal (sealed for life) Ag/AgCl reference half-cell. REFEX provides a stable mV output for measurement and ensures that process fluids do not poison or deplete reference cell electrode or electrolyte.
REFEX continues to perform when completely coated as long as the coating remains wet and is conductive. Even when severe coating of the sensor inevitably slows electrode response, pH and ORP measurement remains accurate. Proven applications range from clean, cold river water to crude oil, sewage sludge and nasty chemical streams – all can be measured with a REFEX reference interface.
The REFEX electrode is the reliable sensor the market has been waiting for – almost maintenance free with exceptionally long life and superb stability.

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All REFEX reference sensor separates and combination probes are built using REFEX reference junction technology and have these very real benefits:

  • They are virtually maintenance free
  • Give exceptionally long sensor life (>5 times longer than traditional probes)
  • Have large surface contact area
  • Work in vacuum without electrolyte reservoirs and up to 300psi pressure
  • Do not leak electrolyte into the process (critical in low-ionic & UPW applications)
  • Do not become clogged (good where precipitates are present)
  • Do not become poisoned (perfect for H2S and chemical process applications)
  • Much faster response times prevent control overshoot
  • Greater accuracy & repeatability

Check out our technology section and see for yourself why electrodes made with a REFEX reference makes so much sense

» REFEX Technology Overview


  • Measurement is accurate, repeatable and above all, reliable
  • Confidence in meeting statutory / regulatory measurement requirements
  • Low maintenance saves manpower – no need to calibrate every week!
  • Maximize plant throughput by dramatically reducing down-time
  • Long life – fewer sensor changes means real cost savings


  • Reduced cost of ownership from greater reliability & reduced maintenance
  • Improve process quality control through reliable measurement
  • Fast response provides real savings by preventing chemical over-dosing

Have an Application?

Let REFEX give you a solution – download an application data sheet, fill in your process specifications and send it to us. We’ll come back to you with a configuration that will suit your needs.

Need Support?

Need additional information or help with your REFEX pH or ORP probe?



REFEX also offer direct replacement electrodes with REFEX technology to upgrade and improve installations where other brands are already in use. Replacements are available for:

  • BAT (Barben Analytical Technologies)
  • E+H
  • Ingold/Mettler Toledo
  • Yokogawa
  • Sensorex
  • Rosemount Analytical
  • Foxboro
  • Van London/Phoenix

Others – contact us with your requirements