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Turtle Tough TT-GP-ORP-IV Twist Lock ORP Sensor

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Acid/Fluoride Resistant, Slurry and Sulphide Resistant

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Product Description

GP-IV Twist lock ORP Sensor


The GP-IV Twist Lock ORP Sensor is uniquely design to interface with our twist lock receptacle for easy insertion or removal from any inline process.  The standard KYNAR fitting is rated to 50 psi, while the PEEK twist lock receptacle is capable of withstanding 100 psi.  A simple one-half turn is enough to engage the sensor in or out of the process line, eliminating the need to “screw-in” a threaded connection. This avoids the time consuming process of a threaded connection, as well as the twisting and twirling of cables that often results in broken connections.

The RYTON body plastics combined with our advanced high capacity KYNAR reference are design for chemical resistance, including sulphides. 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 1” twist lock x 1” MNPT threaded connections allow for both immersion and submersion. With appropriate sealing onto an immersion rod, the sensor may also be fully submersed without the requirement of additional sealing.  Both body plastics and advanced reference system give this sensor an excellent operating range up to 105°C.

This sensor is ideal for any applications where process media containing free sulphide species such as hydrogen sulphide gas (H2S), hydrogen sulphide (HS-) or sulphide ions (S2-). Any measurement where aggressive chemical cleaning is needed to remove fouling or low maintenance operation is required with minimal cleaning and recalibration.

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
  • RYTON Body, 1” twist lock x 1” MNPT threaded 
  • -5°C to 105°C
  • Quick insertion and removal twist lock fitting
  • Pressure resistance to 50 or 100 psi
  • Fast Response TC for calibration accuracy
  • Acid/Fluoride Resistant
  • Slurry & Sulphide Resistant
  • High Capacity KYNAR Reference
  • Proprietary toughened glass
  • 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-IV Twist Lock ORP Sensor

Part Number


mV Range

-2,000 to +2,000 mV

Temperature Range

-5 to 105°C


6.9 to 345 kPa (1 to 50 psig) with 1” MNPT KYNAR Twist Lock

6.9 to 690 kPa (1 to 100 psig) with 1” MNPT PEEK Twist Lock

Body Type

RYTON (Poly-Phenylene-Sulfide)  with Twist Lock Front End – 1” MNPT Back End

Junction Material

KYNAR (Poly-Vinylidene-Fluoride)


206.3mm 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 and Sulphide 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


Double Junction

Reference Half Cell

Ag/AgCl, Saturated KCl

Primary Junction

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

Secondary 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.

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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