REFEX™ pH & ORP Sensors
Thanks to the unique non-porous REFEX™ reference system: durable, low-maintenance, stable and accurate pH measurement — even in processes with aggressive and toxic chemicals.
- Highly resistant to reference poisoning (cyanide, ammonia, H₂S, chlorine…)
- Unique non-porous polymeric reference electrode — no liquid junction
- Very large active reference surface, highly resistant to deposits
- Drift-free measurement and exceptionally long service life
- OEM, private label and custom designs on request
Why non-porous?
Traditional sensors fail because process chemicals diffuse through the porous junction and poison the Ag/AgCl reference. REFEX™ replaces it with an ion-conductive, non-porous polymeric barrier.
Reference system
Solid-state, non-porous polymeric interface; immobilised 2.8 mol/l KCl electrolyte
Measurement
Combined pH and ORP (redox) electrodes without liquid junction
Resistant to
Cyanide, ammonia, H₂S, chlorine, chromium, strong acids/bases, radioactive media
Compatibility
Seamless fit with existing systems and housings
Maintenance
Low-maintenance; no electrolyte refilling, no junction clogging
Service life
Typically >12 months in sour water stripper applications
Field-proven examples
Petroleum refining — sour water stripper
At ~80 °C, H₂S blocks and ammonia/cyanide poison traditional references within days. The non-porous REFEX™ barrier is impermeable to these process chemicals.
Typical service life: 12+ monthsMunicipal wastewater treatment
Sulphides accumulating under anaerobic conditions destroy porous reference systems. REFEX™ prevents silver precipitation and the resulting drift and failure.
Drift-free measurementNeed a sensor for your process?
OEM and custom designs available. Tell us your process conditions and we will recommend the right REFEX™ configuration.
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