pH Sensor for Wastewater

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SKU: TT-WW-pH-2105.

pH Sensor for Wastewater

  • 6m cable
  • RYTON with ¾” MNPT Front & Back End
  • -5°C to 105°C
  • Coat resistant materials reduce fouling
  • Acid/Fluoride Resistant
  • Ammonia, Chlorine and Sulphide Gas Resistant
  • High Capacity KYNAR Reference
  • Extreme Dehydration (optional)
  • 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
  • Description
  • Downloads
  • Application & Use
  • Case Studies

TT-WH2O-pH Waste Water pH Sensor

The Turtle Tough Waste Water pH sensor is unlike anything the waste water market has ever seen before. This space has been dominated by glorified lab electrodes being passed off as “industrial” units and expectations of performance and serviceability are generally low. The Turtle Tough Waste Water pH Sensor will challenge those expectations with its unique formulation to resist fouling, dehydration and provide a service life well beyond those competitors.

Continuous monitoring of waste water presents many challenges across the mining and manufacturing industries. For many facilities, inconsistent flows mean that sensors can dry out if not installed correctly, causing premature failures and ruining measurements. Additionally, there are often contaminants in waste water that will interfere with accurate measurements such as grease or oils that clog references and other components that will coat the measurement elements of sensors.

Turtle Tough sensors are specifically designed for your individual waste water monitoring requirements. The Extreme dehydration option allows sensors to be left dry for very long periods of time and still respond instantly and dynamically on re-entry to solution. This solution has been a huge windfall for manufacturers with batch processes or variable waste water flows, reducing sensor failure and man hours spent removing and changing sensors. Coat resistant sensor elements and general physical strength allow for strong mechanical cleaning of sensors that have been fouled by inorganic material or surface coatings, further increasing sensor lifetime in the field.

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 Waste Water 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: 7/10

This sensor is design for difficult applications with a difficulty index up to 7/10

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.

Girraween, New South Wales, 2010.

A large chicken farm had an issue with pH sensor life. The OEM sensors were only lasting 1-2 weeks in the waste water treatment and water discharge monitoring locations. The wastewater treatment required the pH to be lowered from pH 10 to pH 4 to precipitate the solids out. The pH then needs to be raised to between 7 and 10 at discharge to satisfy local environmental regulations.

By utilising a Turtle Tough sensor with Acid/Fluoride and Sulphide resistance we were able to increase sensor life by up to 6 months which is at least 12 times the life on the sensors being used previously. We also utilised Ryton body plastics to grealty reduce the cost of replacement sensors. The sensor is coupled to the Turtle Tough TT-3TX analyser, capable of handling high impedance, which ensures that sensors can be run to the very end of their useful service life and not rejected prematurely.