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Turtle Tough GP-VII Extreme Submersible pH Sensor

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

Availability: In stock

Exc. GST

Product Description

GP-VII Extreme Submersible pH Sensor

SKU: TT-GP-pH-2007

The GP-VII Submersible pH Sensor is designed to go under… way under!  The unique back end assembly allows sealing to be run down the length of the cable; completely isolating it from the process media and eliminating the risk of ingress or poisoning. This allows for very long life at deep submersion in even the most aggressive processes without needing to seal the sensor onto an immersion rod.  The flexible cable sealing actually allows a sensor to be lowered into a tank or process directly by the cable itself, without any supporting structure. Turtle Tough have design unique and proprietary sensor guide tubes to facilitate this optional installation method, eliminating the need for heaving and cumbersome immersion rods.  The EXTREME submersible assembly provides additional layers of protection for sensors that are immersed at depth for prolonged periods of time. It also provides mechanical strength for sensor that may experience significant physical impact from severe agitation and other forms impact related stress.

The double thickness RADEL body plastics provide exceptional resistance to physical stress and chemical attack, while the high capacity KYNAR reference supports chemical and temperate resistance.  Utilising our proprietary toughened glass the sensor is ideal for slurries and highly 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-VII Extreme Submersible pH Sensor is a popular configuration and demanded by many Turtle Tough customers. 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.

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.

Key Features

  • 6m cable, up to 600m optional.
  • RADEL Body, 1” twist lock x 1” MNPT
  • -5°C to 105°C
  • EXTREME Submersible Water proofing & Cable Sealing
  • Acid/Fluoride Resistant
  • Slurry (High Abrasion) & Sulphide Resistant
  • High Capacity KYNAR Reference
  • Proprietary toughened glass
  • Wide range of optional configurations
  • Optional “Sensor Guide Tubes” eliminate need for immersion rod
  • 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

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.

Additional Information

Additional Information


General Specifications

Part Number



GP-VII Extreme Submersible pH Sensor

pH Range

0 to 14 pH

Temperature Range

-5 to 105°C


6.9 to 1035 kPa (1 to 150 psig)

Body Type

¾” Front End – 1” Back End MNPT, RADEL (Poly-Phenyl-Sulfone)

Junction Material

KYNAR (Poly-Vinylidene-Fluoride)


216mm Length, Maximum Diameter 33.3mm

Cable Length


Temperature Compensation



Not Fitted


Extreme Submersible


Hard Wired Tinned Leads for Sensor & TC

Special Features

Acid/Fluoride, Slurry (high abrasion), Sulphide and Organic Resistant, High Impact Resistant

pH Sensor Specifications

Measuring Glass Type

Hemispherical, Green Glass (MUGG)

Glass Dimensions

8.0mm (0.315”) Diameter

Initial Impedance

< 800 M Ohms @ 25°C

Sodium Ion Error

< 0.15 pH in Na⁺ solutions at pH 14.00

Acidic Errors

< 0.05 pH in HCl solutions at 0.00 pH

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 high capacity Kynar Support Matrix. Holds excess KCl assuring saturation at all temperatures for stability & long sensor service life.

Application Specifications

Recommended Applications

Any process media containing free sulfide species such as hydrogen sulfide gas (H2S), hydrogen sulfide (HS-) or sulfide ions (S2-). 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 pH 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.

Please see

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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