ULTRA Series Digital Smart Fully Submersible pH/ORP Sensors ULTRA Series Digital Smart Inline Twist Lock pH/ORP Sensors ULTRA Series Digital Smart Inline pH/ORP Sensors ULTRA Series Digital Smart Immersible pH/ORP Sensors Unique low profile break resistant glass pH element Unique low profile ORP sensing element Digital Smart Sensors (DSS)  Plug and Play connectivity ULTRA Series Digital Smart  pH/ORP System
ULTRA Series Digital Smart Fully Submersible pH/ORP Sensors

ULTRA Series Digital Smart pH/ORP Sensors


Sensors for Ultra Tough Applications - Aggressive Media Resistant

The ULTRA Series Digital Smart pH/ORP Sensors utilise our very best materials and technologies to work in the harshest of conditions. ULTRA Series sensors have a wide variety of options that allow them to be customised for your application so you get a purpose-built sensor that will outperform all others. Customer’s who choose ULTRA Series products can work with our engineers to tailor an application-specific solution.


The ULTRA series of pH & ORP sensors are made with the very toughest materials and latest technology for exceptional performance in highly aggressive environments. Most importantly they provide accurate and stable measurements at extreme temperatures, and across a wide pH range. This range is available in 3 different body styles: fully submersible, inline sanitary or hot tap and inline twist lock, suiting a wide range of installations.


  • Designed for aggressive media and extremely tough applications
  • Customise chemical attributes to suit different applications
  • Featuring the world’s toughest break-resistant glass
  • Solid State KYNAR reference extremely resilient to contamination
  • Impact and chemically resistant RADEL body plastics
  • Temperature range: -5°C to 105°C Standard (Optional -35°C, up to 150°C)
  • pH range: 0 - 14 pH 
  • Acid/Fluoride, Ammonia, Cyanide, Chlorine and Sulphide Gas Resistance

Break Resistant Glass
The UltraTough series features our unique break-resistant glass which is highly resistant to impact and high-velocity solids. Not only will the glass resist abrasion in the process, but its incredible strength means that the build-up of solids can be removed through aggressive cleaning without fear of breakage.

Solid-State Reference
At the heart of our Ultra Tough range is a Kynar solid-state reference system. Kynar has high chemical resistance, is extremely resilient to contamination and is very economical for industrial applications with temperatures up to 105°C. Our solid-state reference is formulated with specific salt mixtures, to provide extreme performance in a wide variety of applications. The non-porous attributes of this component make it extremely resistant to process contamination providing long life under harsh chemical conditions. Anti-Fouling Fouling is a common problem with most brands of sensors. Turtle Tough utilise a large open geometry design with coat resistant materials. Our ability to withstand high velocity allows the sensor to be placed in high flow areas to keep the sensor clean and maintain optimal performance of the sensor within the sensibilities of a standard cleaning regime.

Customise for your process
Our Ultra Tough sensors can be configured and customised for your application. See the product brochure for the available custom options. 

About our Digital Smart Sensor (DSS) Technology
Turtle Tough gives you the option of a propriety digital signal or an open-source Modbus RTU signal that is universally accepted. To find more about the benefits of our Digital Smart Sensor technology go to turtletoughsensors.com/sensortechnology

Sensor Care and Maintenance
Turtle Tough sensors can be cleaned and calibrated offline to facilitate a hot-swapping maintenance regime. To know more about our sensor care and hot-swap maintenance regime go to turtletoughsensors.com/support/maintenance



Sensor name ULTRA Series Digital Smart pH/ORP Sensors
Measuring type pH ORP
Sensor installation types Immersion (IMR), Fully Submersible (SUB), Twist Lock Inline (TWL), Inline Sanitary & Hot Tap (INL)
Output types DSS Direct Smart Sensor Technology (DSS). This open-source digital signal output (Modbus RTU) is compatible with a wide range of devices that can accept a Modbus signal*.
PD Proprietary Digital technology (RS485) (PD). This closed source digital signal output is only compatible with selected Turtle Tough Analysers*.
Pressure Immersion & Fully Submersible Sensor rating 150 psi. (6.9 to 1035 kPa)
Twist Lock Twist Lock Sensor rating 150 psi. Kynar Twistlock Fitting: 50 psi. PEEK Twistlock Fitting 100 psi.
Inline Sensor rating 150 psi. Tri clover Fitting: Max recommended pressure 100 psi. 1 ¼ inch Threaded Socket: 150 psi (200 psi optional with sensor upgrade).
Hot Tap Sensor rating 150 psi. Hot Tap Assembly: Max recommended pressure 100 psi.
Temperature range -5°C to 105°C (Optional -35°C to 150°C)
Junction material Kynar (Poly-Vinylidene-Fluoride)
Cable length 6m (12m optional)
Temperature compensation Pt1000
Connection Quick Connect Plug - 4PIN (NEMA 6P)
pH/ORP range 0 to 14 pH ±1000 mV Absolute. Optional, wide range ±2,000 mV Absolute
Measuring element type Ultra Tough Break Resistant Glass Platinum ball in the low profile configuration
Element dimensions 8.0mm (0.315”) Diameter 5.0mm (0.197”) Diameter
Initial impedance <1,500 M Ohms @ 25°C N/A
Sodium-ion error < 0.15 pH in saturated Na⁺ solutions at pH 14.00 N/A
Acidic errors < 0.05 pH in HCl solutions at 0.00 pH N/A
Reference type Double Junction (Optional: Triple
Reference half cell Ag/AgCl saturated KCl
Primary junction Porous Ceramic, Saturated KCl in Cross-linked polymer, interfaced to the secondary junction
Secondary junction Solid-state non-porous cross-linked polymer embedded in Kynar support matrix holds excess KCl assuring saturation at all temps for stability and long sensor service life
Special features Acid/Fluoride, Ammonia, Chlorine and Sulphide gas resistant
Storage Keep at room temperature with a closed protector cap, filled with a storage solution in an upright position
Warranty 12 Month Conditional Warranty. Visit turtletoughsensors.com/warranty-returns


TurtleTough TT MA RH 

Extreme sensors call for extreme analysers and the Turtle Tough range has been designed with exactly that in mind. Whatever the application, we have a range of Smart analysers and control options to interface with your DSS sensors. Click to view our range...

Interface Hardware

TurtleTough TT MA RH 

We have a range of Digital Smart System accesories to interface, calibrate and communicate with your DSS sensors. Click to view our range...