pH Sensor for Zinc

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SKU: TT-Zn-pH-2102.

pH Sensor for Zinc

  • 6m cable
  • RADEL with ¾” Front End – 1” Back End MNPT
  • -5°C to 105°C
  • Triple Junction
  • Zinc Ion Resistant
  • Slurry Resistant
  • Acid/Fluoride Resistant
  • Ammonia, Chlorine & Sulphide Resistant
  • High Capacity KYNAR Reference
  • Digital smart sensor technology
    • 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
  • Description
  • Downloads
  • Application & Use
  • Case Studies

TT-Zn-pH Zinc pH Sensor

The TT-Zn-pH Zinc pH Sensor has more than 10 years history of providing unparalleled performance in Zinc leaching processes.

Zinc is leached using sulphuric acid, which dissolves the zinc content and leaves the iron and lead precipitates undissolved. However, the process can be inefficient if there aren’t adequate process controls in place, and can lead to lower grade products. Sensors will often drift significantly, and there is constant attack on the pH glass elements from the dissolved zinc complexes. In conjunction with one of our major clients, we developed a pH glass element that resists attack from these zinc complexes, which both improves sensor lifetime and greatly reduced sensor drift.

Additional sulphide resistance has been added to all components and by increasing the physical strength of the body this sensor can also be used in in high velocity, high solid content slurries where other sensors will easily break. The improved accuracy and stability of this sensor has proved itself in improving zinc yields, while the increased sensor lifetime will reduce labour costs and total cost of ownership.

Due to the high resistance qualities of this sensor it is only available in our digital smart sensor technology.

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 Zinc industry.  This sensor will also perform well in applications where high levels of sodium ions are present, including brine applications. A saturated sodium resistant pH glass ensures accurate readings, stability and longevity in these environments. Also 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.


Lawn Hill, Queensland, 2005.

A major zinc producer informed us that during operation of the zinc concentrator and thickener, their pH sensors were unable to cope with the solids content and composition, causing the reference junction to persistently clog and foul.

Unbeknown to them was that the reduced response and subsequent shortened sensor life was also due to poisoning of the glass by high concentrations of zinc.

Utilising our zinc resistant glass we provided a replacement sensor to interface direclty with their Foxboro transmitters. We also took advantage of our slurry/viscous design which is able to withstand high velocity and high solid content environments. This self cleaning design removes problems due to clogging and fouling of the reference. Sensor life expectancy was increased 6-8 times, and hands-on maintenance time was significantly reduced. Zinc Processing