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pH and ORP Sensors

ULTRA TOUGH pH/ORP Smart Sensor

The ULTRA TOUGH pH/ORP Smart Sensor from Turtle Tough is built for aggressive media and extremely tough applications. Break-resistant glass, a solid-state Kynar reference and impact- and chemical-resistant Radel body plastics give accurate, stable measurement across a wide pH range and at extreme temperatures.

With Direct Smart Sensor (DSS) technology, the sensor outputs an open-source Modbus RTU (RS-485) signal that connects directly to a PLC, SCADA or DCS without proprietary hardware. Calibration data, performance history and diagnostics are stored on the sensor, so it can be cleaned and calibrated offline and hot-swapped in the field.

FAQ

What is a pH sensor?

A pH sensor measures how acidic or alkaline a liquid is. A pH-sensitive glass electrode develops a small voltage that changes with the hydrogen ion activity of the solution, and this is compared against a stable reference electrode. The difference is converted to a pH value, with temperature compensation applied because the electrode response changes with temperature.

What is the difference between pH and ORP?

pH measures acidity or alkalinity, while ORP (oxidation-reduction potential) measures the ability of a solution to oxidize or reduce, reported in millivolts. ORP sensors use a platinum measuring element instead of pH glass and are commonly used to monitor disinfection (such as chlorine) and chemical oxidation or reduction processes.

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What are the advantages of the ULTRA TOUGH pH/ORP sensor?

  • Break-resistant glass – resists impact, abrasion and high-velocity solids, and can be cleaned aggressively without fear of breakage
  • Solid-state Kynar reference – non-porous and highly resistant to process contamination for long service life
  • Chemical resistance – designed for acid/fluoride, ammonia, cyanide, chlorine and sulphide gas environments
  • Anti-fouling – large open geometry and coat-resistant materials suit high-flow locations
  • Smart sensor – stores calibration, performance history and diagnostics on-board for hot-swap maintenance

Specifications

  • pH range: 0 to 14 pH (optional −4 to +16 pH)
  • ORP range: ±1,000 mV absolute (optional wide range ±2,000 mV)
  • Temperature range: −5 to 105 °C (standard)
  • Sensor pressure rating: 150 psi (the mating installation hardware may set a lower limit)
  • Output: DSS – Modbus RTU (RS-485), or PD – proprietary digital RS-485 for selected Turtle Tough analysers
  • Reference: double junction (triple junction optional), Ag/AgCl, saturated KCl
  • Temperature compensation: Pt1000
  • Body: Radel (PEEK upgrade available)
  • Cable: 6 m standard (12 m optional), 4-pin NEMA 6P quick-connect plug

What installation types are available?

  • Immersion (IMR) – ¾” x 1″ body with fast-response temperature sensor in the tip
  • Fully Submersible (SUB) – ¾” x 1″ body with back-end waterproofing (not for inline use)
  • Inline Twist Lock (TWL) – 1″ twist-lock body for quick-disconnect inline mounting
  • Inline & Hot Tap (INL) – ¾” inline body for sanitary and retractable hot-tap holders

What customization options are available?

Options include triple junction, extreme dehydration resistance, extreme cold, organic media resistance, special Teflon sealant, sodium-resistant, zinc-resistant and high-HF glass, high temperature, fast-response temperature sensor, vinyl or high-temperature norprene cable protection, PEEK body, 12 m cable and a combination pH/ORP electrode. Contact Metex to configure the right sensor for your application.