ISE Sensor for Fluoride (F-)

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ISE Sensor for Fluoride (F-)

The TT-GP-F-6008 is the ONLY Fluoride (F-) ion selective sensor that can be:

  • Used in strong acid fluoride etching service at elevated temperatures up to 70 degrees Celsius
  • Undergo strong acid cleaning to remove calcium and silicate deposits
  • Suitable for acid fluoride metal etching process measurement or fluoride wastewater treatment systems.
  • Ready for immersion installation standard or fully submersible with insertion tube or waterproofing (optional)
  • RADEL with Double O-Ring Front End — ¾” MNPT Back End
  • Hot-tap insertion valve retractable assembly (up to 10 psi); or
  • Sanitary assembly and tri clover fitting (up to 10 psi)
  • Acid/Fluoride Resistant
  • Sulphide Resistant
  • Slurry Resistant (High Abrasion)
  • High Capacity KYNAR Reference (HDPE for ultralow option)
  • Proprietary toughened glass
  • Sensor holder and valve retractable assembly sold separately
  • 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-GP-F-6008 ISE Sensor for Fluoride

Thefluoride-ise-270x334 Turtle Tough Fluoride ion selective electrode is a solid-state fluoride mono-crystal and conductive-polymer reference system that allows for extremely low cost-of-ownership without any costly reagents or sample conditioning.

It is the ONLY Fluoride (F-) ion selective sensor that can be used in strong acid fluoride etching service at elevated temperatures up to 70 degrees Celsius and can undergo strong acid cleaning to remove calcium and silicate deposits.  It is also suitable for acid fluoride metal etching process measurement, or fluoride wastewater treatment systems.

Turtle Tough provide an unrivalled and proven solution for Fluoride measurement. The ISE sensor is capable of measuring from 0.019 to 19,000 ppm (1X10-6 to 1.0 Molar) and its lowest limit of detection is 0.001 ppm (5X10-8 Molar).  It will operate over a broad pH range from 2.5 to 11.

For applications where the pH is above 8.0, a pH sensor is added to the analyser to provide compensation of both pH and temperature. The sum of the measured unbound ammonium ions and dissolved ammonia gas formed must be computed as a function of both real-time continuous pH & temperature parameters.

Our valve refluoride_ion_selective_ise_sensortractable sensor is uniquely designed to interface with both our hot-tap insertion valve retractable assembly or our  sanitary fitting.

Our hot-tap assemblies are a common feature in industries where direct access to the process is required inline or in-tank without interruption to service.

Shown LEFT in full submersible configuration.

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.

TTMA-multichannel-analyser-3 270x334Analyser

The TT-GP-F-6008 interfaces with the TT-MA or TT-MAD ISE Modular Analysers. The unique modular design enables you to create a fully functional, multi-parameter analyser with any combination of different TT-MA analytical modules.

The TT-MA and MAD Analyser modules have the following features:

  • Scale 4-20mA analogue output is standard for all measurement modules. Active 4-20mA can support remote external displays to allow for viewing measured values in control panels, secondary field locations, or instrumentation shops.
  • Modbus digital output optional.
  • Precise factory-calibrated linear analogue output allows excellent use in control applications. All analogue outputs have built-in trim calibration support, including both offset and span adjustments.
  • Calibration of temperature compensation element is available for all measurement modules.
  • Economical Custom Configurations offer the freedom to pay only for the specific modules you need; pH, ORP, Dissolved Oxygen, Ion Selective (ISE) and temperature.
  • Easy to use simple and intuitive three-button operation with no complex codes to memorize for most day-to-day tasks.
  • Easy to read displays with bright three-digit LED displays are visible even in bright sunlight and do not suffer from the common problems associated with LCD displays, such as environmental fatigue and wear.
  • Weatherproof NEMA 4X CSA/UL rated & IP65 enclosures include high quality sealing cable glands that are ideal for weatherproof sealing on sensor, power, and output cables.
  • Power supply is CSA/UL/CE approved universal 100 to 240 VAC 50/60 Hz power supply module for line powered operation, or 3-wire 24VDC powered operation.


Municipal potable water and water treatment facilities (POTW) for monitoring and/or control of fluoridation process. Industrial facilities required to monitor and/or treat the fluoride ion level prior to discharge for compliance and other environmental remediation.  Environmental monitoring in rivers, lakes and ponds for public health and safety. Any free fluoride ion measurement that needs to operate with minimal cleaning & recalibration frequency (i.e. remote sites that are unattended for long periods of time).  Solid-state fluoride monocrystal and conductive-polymer reference system allows for extremely low cost-of-ownership without any costly reagents or sample conditioning.

Application Difficulty Index:6/10

This sensor is design for difficult applications with a difficulty index up to 6/10

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.