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WEL pH and ORP Electrodes


Walchem’s WEL Series electrodes are cost-effective differential pH and ORP electrodes for industrial applications. They are modular in design with a rugged CPVC housing that contains the electronics; pH and ORP cartridges can easily be connected or replaced in minutes without tools.

  • Differential preamp
  • Universal mounting, easy to install
  • Easily replaceable electrode cartridges
  • Electronics are not discarded with the electrode
  • Optional ATC
  • Cartridge Styles:
    • Flat Surface
    • Bulb / Rod
    • HF Resistant
    • Low Ionic Strength pH cartridge
  • Resistant to electronic noise, ground loops
  • CE Performance & Safety Certifications

Measurement Performance

Range 0 to 14 pH (0 to 12 without sodium ion error)     ±1999 mV (ORP)
Response 95% in less than 5 seconds
Temperature Range with preamplifier 32 to 158ºF (0 to 70ºC)
without preamplifier 32 to 212ºF (0 to 100ºC)
Pressure Limit 100 psi