pH Sensor for Gold

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SKU: TT-Au-pH-2101.

pH Sensor for Gold

  • 6m cable
  • RADEL 3/4″ front end x 1″ MNPT Back End
  • -5°C to 105°C
  • Triple Junction Kynar Reference
  • High Cyanide Resistant
  • Acid/Fluoride Resistant
  • Ammonia, Chlorine and Sulphide Gas Resistant
  • Slurry 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

Learn more about the importance of pH control in gold processing…

  • Description
  • Downloads
  • Application & Use
  • Case Studies

TT-Au-pH Gold pH Sensor

The TT-Au-pH Gold pH Sensor is the result of more than 20 years experience in gold ore mining and refining processes. This sensor continues to provide unparalleled performance and service life in this demanding application earning it the respected title of being the best in the industry.

Leaching gold with cyanide is the most common method of gold recovery from ores, and requires precise electrochemical control of a number of reagents. Alkaline environments are a must for safety; incorrect pH control can cause over-use of reagents and create highly dangerous process environments with the evolution of Hydrogen Cyanide. We have supplied accurate, long life sensors for pH, ORP and cyanide into numerous gold processing facilities throughout Australia, Asia and Africa for almost 25 years.

Every process has its own specific challenges, and the ability to customise our sensors depending on specific ores has meant that we get the highest level of accuracy and the longest lifetimes in any gold mining environment. Dissolved gas resistance, cyanide resistant, tough pH glass elements and customisable body plastics are just some of the solutions we have come up with over the years.  This popular sensor configuration utilises our superior, slurry resistant RADEL body plastics which provide extra durability in high impact and high abrasion environments. The 3/4” thread on the front end provides a quick and convenient means to install directly inline, or alternatively utilise the 1” MNPT back end connection to install onto an immersion rod or stand pipe.  The high capacity triple junction KYNAR reference provides exceptional resistance to sulphides and other dissolved gasses.

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 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.



Specifically designed for the Gold industry.  Will also perform well in industrial, chemical, food & beverage, semiconductor, pharmaceutical & wastewater applications. Suitable for any measurement where aggressive chemical cleaning is needed to remove fouling, or low-maintenance operation is required with minimal cleaning and re-calibration.

Application Difficulty Index: 9/10

This sensor is design for difficult applications with a difficulty index up to 9/10

Maintenance FREE

Turtle Tough pH and ORP sensors are a completely sealed assembly and are sealed for life.  This provides extreme process resistance as well as a totally maintenance free sensor which greatly increases sensor life and reduces labour costs.  A Turtle Tough sensor does not contain any O-rings, washers, gaskets, or serviceable components/assemblies. It does not require refreshing or refilling of electrolyte. The only requirement is regular cleaning in accordance with our recommended cleaning schedule for your application. Regular cleaning will prolong the life of your sensor and ensure hassle free operation.

Recommended Cleaning Schedule

The recommended cleaning interval is based upon the difficulty index for your application.

Recommended Cleaning Schedule

Application Difficulty Rating

Cleaning Schedule








Twice (2x) per week



If a Turtle Tough pH/ORP sensor response slows down, it is most likely the result of a fouled  reference or dirty coated glass.  Cleaning should be performed as required and will vary across  applications.  See cleaning instructions.


The standard shelf life for all Turtle Tough pH and ORP sensors is one year from the date of shipment. Sensors stored longer than this period may still be functional but are no longer under warranty. Sensors should be stored in a cool, dry location with the sensor tip (sensing element) oriented toward the ground.  All sensors come standard with a conditioning solution in the cap. This conditioning solution is 50% pH 4 buffer and 50% saturated potassium chloride (mixed by volume). The sensor cap should be kept tightly affixed to the sensor body and sealed with common PVC tape when the sensor is not in use. Sensors that are to be returned for shelf life warranty claim must have the original sensor cap and conditioning solution intact to be eligible for warranty replacement.

Avoiding Thermal Shock

For high temperature applications where process liquid exceeds 70°C you will prolong the life of the sensor by avoiding thermal shock. Thermal shock occurs when you rapidly change the temperature of the sensor from hot to cold or vice versa. This rapid expansion/contraction of sensor components can damage internal elements and cause micro-cracking that will accelerate the rate of deterioration. In extreme cases it will crack the sensing element causing a total failure.  To avoid this sensor should be heated or cooled slowly during removal/insertion and cleaning and calibration processes. Consult your Turtle Tough representative for techniques to avoid thermal shock.

Conditioning After Calibration

After the sensor has been cleaned, it must be thoroughly rinsed with deionised water to remove any residual cleaning reagents. The sensor can then be soaked in pH 4 buffer to recondition the pH and reference elements. Some sensors will also require conditioning in saturated potassium chloride if the reference junction has been depleted of the ions in the solid state conductive polymer (typical for clean water applications). Condition the sensor in saturated potassium chloride and/or pH 4 buffer for whatever period of time is required to achieve optimal calibration results.

Please refer to your sensor manual for correct installation, maintenance and use.

Telfer, Western Australia, 2005.

A major gold mining company was experiencing a very high turnover of pH sensors. After trying most of the major brands they were struggling to find one that worked. Due to a highly complex gold and copper ore mixing process, the presence of sulfides and fluorides produced dissolved gasses that wreaked havoc on sensors, rendering most pH sensors unusable.

We supplied them with our proven Turtle Tough sensor for gold mining applications which they could interface to their existing Rosemount and Yokogawa analysers. Utilising our unique triple junction design, coupled with our acid/fluoride resistant glass, and sulfide resistant junction we drastically reduced the dissolved gas attack, increased the resistance to high cyanidation and sulfides, while the overall tough construction of the sensor was able to withstand the fluctuating solids content at high velocity.

For more than 10 years now our Turtle Tough sensors have been experiencing more than 8-10 times the life span of the previous sensor.

Westonia , Western Australia, 2013.

A gold mining company contacted us with issues of erratic readings and general unreliability with their existing measurement system. As is common with many smaller processing facilities, electrical components and equipment being installed in close proximity to one another can generate a lot of electrical noise interefering with measurement systems.

Our Turtle Tough pH sensor with integrated premaplifiers and anti-noise coaxial cable solved the problem, allowing for noise free signal transmission. Despite being a relatively easy application; a gold carbon-in-leach (CIL) process, our industrial sensor configuration still outlasted the previous sensor by 3-4 times.