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Turtle Tough TT-GP-ORP-VIII High Temperature ORP Sensor

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Acid/Fluoride Resistant, Slurry (High Abrasion) and Sulphide Resistant

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Product Description

GP-VIII High Temperature ORP Sensor


The GP-VIII High Temperature ORP Sensor is made with PEEK body plastics to resist high process temperatures up to 135°C continuous operating temperature.  With an optional upgrade to the reference we can achieve continuous temperature exposure of 150°C.  All Turtle Tough high temperature sensors are equipped with fast response temperature compensation to guarantee high calibration accuracy.  At these temperatures slow response to temperature can introduce significant measurement errors that are reduced by high accuracy and rapid response temperature compensation.

The PEEK body has the highest of all chemical and physical resistance properties. The high capacity KYNAR reference provides chemical and temperate resistance.  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. For operators who are prone to bashing the sensor against hard surfaces or smashing the glass during maintenance, the optional ULTRA TOUGH break resistant glass is an excellent option.

The GP-VIII High Temperature ORP Sensor is a popular configuration and 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.

The Turtle Tough GP-VIII High Temperature ORP Sensor is ideal for applications such as industrial autoclaves, ammonium nitrate plants, sugar refining and extraction.  Any measurement where aggressive chemical cleaning is needed to remove fouling or low maintenance operation is required with minimal cleaning and recalibration

Not suitable for use in low conductivity, steam sterilization or steam type processes.

Digital Smart Sensor Technology (DSST)

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. On-board sensor memory allows the storage of calibration dataanalyser 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.

Key Features

  • 6m cable, up to 600m optional.
  • PEEK Body, ¾” twist lock x 1” MNPT
  • -5°C to 135°C (optional 150°C)
  • Fast response TC for accurate calibration
  • Acid/Fluoride Resistant
  • Slurry (High Abrasion) & Sulphide Resistant
  • High Capacity KYNAR Reference
  • Proprietary toughened glass
  • Wide range of optional configurations
  • Digital smart sensor technology (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

Additional Information

Additional Information



General Specifications


GP-VIII High Temperature ORP Sensor

Part Number


mV Range

-2,000 to +2,000 mV

Temperature Range

-5 to 105°C


6.9 to 1035 kPa (1 to 150 psig)

Body Type

PEEK (Poly-Ether-Ether-Ketone)  with ¾” Front End – 1” Back End MNPT

Junction Material

KYNAR (Poly-Vinylidene-Fluoride)


216mm Length, Maximum Diameter 33.3mm

Cable Length


Temperature Compensation



Not Fitted


Immersible, Submersible if threaded on sealed immersion rod with sufficient sealing tape


Hard Wired Tinned Leads for Sensor & TC

Special Features

Acid/Fluoride, Slurry (high abrasion), Sulphide and Organic, High Impact Resistant, High Temperature Resistant, Accu-Temp Pt1000

ORP Sensor Specifications

Measuring Glass Type

Platinum Ball in Low Profile Configuration

Glass Dimensions

5.0mm (0.197”) Diameter

Reference System Specifications


Triple Junction

Reference Half Cell

Ag/AgCl, Saturated KCl

Primary & Secondary Junction

Porous Ceramic, Saturated KCl in Cross-linked polymer, interfaced to Tertiary Junction

Tertiary Junction

Solid-State Non-Porous Cross-Linked Polymer embedded in Kynar Support Matrix holds gross excess KCl assuring saturation at all temps for stability & long sensor service life.

Application Specifications

Recommended Applications

Any process media where the redox (ORP) potential is monitored or controlled. Can be combined with other sensor options available for pH sensors such as high temperature resistant, slurry & viscous material resistant, acid fluoride & HF resistant, pulp and paper resistant, sulfide resistant, dissolved gas and organic solvent resistant or saturated brine resistant. Any measurement where aggressive chemical cleaning is needed to remove fouling or low-maintenance operation is required with minimal cleaning and re-calibration.

Analyser / Interface

All Turtle Tough ORP Analysers


Item should be kept at room temperature with closed protector cap, filled with storage solution in an upright position. Shelf life warranted for 12 months from the date of purchase.


12 Month Conditional Warranty

Application Aquaculture, Chemical Processing , Food & Dairy, Laboratory, Pulp & Paper, Soil & Fertilisers, Water & Wastewater, Mining Slurries, High Cyanide, Titanium Dioxide, Solvent Extraction
Duty Cycle Moderate, Heavy, Ultra


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