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GP5 Valve Retractable pH & ORP Sensor


The GP5 Valve Retractable pH & ORP Sensor is uniquely designed to interface with our HOT TAP insertion valve retractable assembly, or sanitary assembly held in place by a tri-clover fitting. Both methods allow for rapid insertion and removal from a process under pressure.

  • Available as a TOUGH analogue or Smart digital sensor
  • HOT TAP Insertion Valve Retractable assembly (up to 150 psi); or
  • Sanitary assembly and tri clover fitting (up to 100 psi)
  • Acid/Fluoride Resistant
  • 0 to 14 pH Range
  • -5°C to 105°C
  • Immersible, Submersible when threaded onto a sealed immersion rod with sufficient sealing tape

Our HOT TAP assemblies are a common feature in industries where direct access to the process is required inline or in-tank without interruption to service. The RADEL body plastics provide superior resilience to physical impact and high abrasion, while the high capacity Polypropylene reference provides both chemical resistance and temperate resistance to 105°C. Utilising our proprietary toughened glass the sensor is ideal for slurries and abrasive media as well as being capable of resisting acids or fluorides that may chemically attack the glass.

The GP5 Valve retractable pH & ORP sensor is one of our most demanded configurations and meets the installation requirements of many applications. As such this sensor is available in many optional configurations including high impact break resistant glass, ultra high temperature, dissolved gas and volatile organic solvent resistant, high HF acid resistant, brine and extreme dehydration resistance.

Digital Sensor Technology (-D)

This sensor is available with our digital smart sensor technology. This plug and play sensor has a quick connect fitting, eliminating the need for hard wiring to the analyser. Onboard sensor memory allows the storage of calibration data, analyser configurations and sensor service history. This allows the sensor to be conveniently maintained and calibrated off-site or in the laboratory and pre-programmed with calibration data and analyser configurations. This stored information automatically uploads to the analyser upon connection and eliminates the need for any interaction with the analyser, greatly simplifying the change-out of sensors. A service log stored on the sensors is ideal for maintenance and quality assurance records.

The valve retractable sensor is designed to be mounted inside the sensor holder. Standard material of construction is 316SS, with titanium and SAF materials optional. The sensor holder is rear threaded to be connected to an extension pole. The complete assembly is designed to work with our single ball valve and double ball valve assemblies. 

Optional Configurations:

  • Dual Port Purge Flush Chamber – allows the sensor to be flushed and cleaned before removal.
  • Bridge Box on top of the extension tube. Ideal for quick disconnect digital sensors with DSST.

Other Specifications:

  • 6m Cable (Analogue & Digital)
  • RADEL (Poly-Phenyl-Sulfone) with Double O-Ring 3/4" MNPT Front & Back End
  • Fast Response TC for calibration accuracy
  • Slurry (High Abrasion) & Sulphide Resistant
  • Proprietary toughened glass
  • Sensor Holder and Retractable Valve assembly sold separately
  • Wide range of optional configurations
  • Digital Sensor Technology (-D) (optional)
    • No hard wiring – plug-n-play connectivity
    • Sensor stores calibration data, analyser configuration and sensor history
    • Hot-swap for quick sensor change-out
    • No interaction with analyser – sensor data auto uploads


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