Industrial pH, ORP, Ion Selective (ISE), Conductivity & Dissolved Oxygen (DO)

Measurement Product Line Overview

Smart MODBUS Sensors & Touchscreen Controllers

Smart Digital pH, ORP, Dissolved Oxygen (D.O.), Ion Selective (ISE) and Conductivity (EC) sensors for the Industrial Internet of Thing (IIoT) allowing for direct integration with customer PLC and SCADA for inline, immersion, submersible, sanitary & HOT-TAP valve retractable installations. Interface sensors directly via RS-485 MODBUS RTU or MODBUS TCP (Modbus over ethernet) with advanced menu-driven multi-channel touchscreen controllers with full remote access capabilities for HMI and remote download of logged data over FTP. Complete turn-key measurement systems include complete datalogging of all process values, calibrations & analytics with local relays for alarm & control to provide intelligent predictive maintenance with email notifications for trigger events. Optional configurations include explosion-proof ATEX approved EX rated controllers suitable for use in hazardous locations and severe service installations as well as plug and play portable battery powered handheld communicators for remote calibration & spot measurements.

Industrial pH/ORP Sensors

Rugged line of custom built-to-order analog & smart digital industrial pH & ORP sensors for inline, immersion & submersible, twist lock quick-disconnect, valve retractable and sanitary installations for wide range of applications including process that contain slurry & viscous solutions, sulfides, high temperatures, organic solvents, HF etching bath and wastewater treatment systems. Unique features include low-profile break-resistant parabolic thick-wall pH glass elements for abrasives and solid-state non-porous conductive polymer reference systems. Special extreme dehydration resistant reference option for allows for intermittent wet & dry use and prolonged exposure to air without drying out. Smart digital configurations can be precalibrated to support seamless hot-swap plug and play exchange of sensors with waterproof NEMA 6P rated snap connectors in the field without any user action required whatsoever.


Industrial Ion Selective (ISE) Sensors

Simple to use industrial ion selective measurement systems are supplied complete with smart digital ISE sensor and mating field instrumentation ready for immediate commissioning in the field. Only a periodic grab sample offset calibration is required in the field. No standard solutions are required at all for commissioning nor for ongoing maintenance. Full graphical remote access over ethernet capabilities allow for convenient remote offset calibration from the field lab or workshop where grab samples are often analyzed. Special model AB 6100 fluoride ion selective sensor configuration supports strong acid cleaning to remove fouling from calcium and silicate precipitates as well as for use in strong acid fluoride etching baths even at elevated temperatures. Novel materials of construction and membrane fabrication technologies allow for operation of these ion selective sensor in aggressive process conditions which are required for heavy industrial service applications.

Industrial Conductivity Sensors

Industrial conductivity sensors for use up to 205 degrees Celsius and 500 psig suitable for measurements from 0.055 microSiemens and up to 2,000 milliSiemens. Applications supported include ultrapure water, strong acids, strong bases and concentrated electrolytes. Materials of construction include 316SS, Monel, Titanium, Hastelloy C-276 for electrodes and TEFLON, CPVC, KYNAR and PEEK for the insulator. Cell constants available from 0.01 to 20.0 and anywhere in between are available to optimized precision for any range of interest. All conductivity sensor configurations are available in smart digital MODBUS RTU style to interface directly with any suitable mating PLC or SCADA or else complete with ASTI supplied instrumentation such as the multichannel smart touchscreen controllers. Supported units include both the measured microSiemens/cm (μS/cm) or milliSiemens/cm (mS/cm) as well as computed units of total dissolved solids (TDS) or salinity (PSU) and resistivity units of MegaOhms (MΩ) for ultrapure water applications.

Industrial Dissolved Oxygen Sensors

Rugged industrial dissolved oxygen (D.O.) sensors for inline, immersion & submersible, twist lock quick-disconnect, valve retractable and sanitary installations are completely insensitive to the presence of hydrogen sulfide (H2S) gas. Measurement ranges from 0-150 ppm & 0-1,500 percent (%) saturation supported. Ideal for continuous measurement in tough applications such as processes with abrasive slurries, high levels of organic and biological content as well as solutions with high turbidity & viscosity. Percent saturation units computed based upon the measured dissolved oxygen ppm and temperature in conjunction with the user provided air pressure and salinity. Automated calibration is performed dry in air with no standard solutions required. Sensor include waterproof NEMA 6P rated snap connectors for seamless hot-swap plug & play operation in the field after recalibration or rebuilding of cell with no operator action required in the field for sensor exchange.

Industrial Instrumentation

Touchscreen controllers with full graphical remote access over ethernet provide a programmable universal intuitive interface for all smart digital HiQDT MODBUS RTU pH, ORP, ion selective (ISE), conductivity (EC) and dissolved oxygen (D.O.) sensors with CSA & UL agency approvals for use in Class I, Division 2 locations. Standard outputs for touchscreen controllers include isolated scalable analog 4-20mA, programmable contact relays and MODBUS TCP communications along with integral datalogging for all measured parameters as well as sensor analytics and calibrations. Explosion-Proof (EX) rated intrinsically safe controller configuration are available for use in hazardous Class I, Division 1 locations with FM, CSA, ATEX and IECEx agency approvals with isolated scalable analog 4-20mA output and programmable contact relays including TPC algorithms.

HOT-TAP Valve Retractable Assemblies

The third generation valve retraction HOT-TAP assemblies allow for insertion and removal of the sensor without shutdown or separate isolation of the process line or tank. These HOT-TAP assemblies are available for 5X31, 5X41, 5X51 & 5XX0 sensor types. Available in 316SS material of construction standard with TEFLON seals and ferrules with Viton or Kalrez O-rings ensure a secure water tight even at high temperatures (150 deg Celsius) and pressures (up to 150 psig max). Double redundant O-rings on sensors (Viton-75, CV75, Simriz 485 or Kalrez 4079) ensure leakproof seal between sensor and HOT-TAP assembly. Reducing bell stop out for sensor holder makes blow-out nearly physically impossible to ensure safety of operator in high pressure use when retracting sensor. Custom materials of construction and configurations are available upon request.

Submersible Assemblies with Waterproofing Seals

The longevity of pH, ORP, ion selective (ISE), dissolved oxygen (DO) and conductivity sensors can be significantly elongated for some applications using our waterproofing sealing options for a variety of applications to create fully submersible assemblies without the need for an immersion tube. Installations either completely submersing the sensor or where the back of the sensor will be exposed to moisture or facility washdowns benefit greatly from these waterproofing seals in particular. Inquire to the ASTI factory to determine if a waterproofing option is required for your installation type and if required the most appropriate grade of sealing to be invoked. Standard material is polypropylene for A/B/C series and CPVC for G/H series. Special materials of construction are available for waterproofing seals upon request (MOQ may apply).

ZEUS pH Sensors

ZEUS™ pH SENSORS FOR TOUGH INDUSTRIAL APPLICATIONS ARE TYPICALLY IN STOCK FOR IMMEDIATE DISPATCH TO SOLVE YOUR PROBLEM INSTALLATION RIGHT AWAY. ZEUS™ Industrial Grade pH sensors are designed and built with Extremely Rugged Construction to handle the Toughest Severe Service Process Inline, Immersion or Submersible Installations. Analog ZEUS™ pH sensors available in Universal configuration with temperature compensation & liquid earth solution ground only or else with integral conventional or 5-wire differential integral preamplifier configurations. Smart digital ZEUS™ pH sensor configuration interfaces the modular cost-effective intelligent 3TX-HiQ-pH digital pH/ORP transmitter. The ZEUS™ smart digital configuration is also available for ORP measurements. Both analog and smart digital configuration of the ZEUS™ sensors can support pressures up to 200 psig & temperatures up to 150 degrees Celsius. Inquire to factory to ensure suitability for your exact use. Smart Digital MODBUS RTU configuration of ZEUS™ pH & ORP sensors can be directly interfaced to most modern PLC.


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Please keep in mind that the links above do not represent the entirety of the ASTI industrial product line but rather the most commonly sold offerings. For example, please inquire directly to the factory for any dissolved oxygen and temperature measurement needs in addition to the pH, ORP, ion selective (ISE) and conductivity electrochemical products links detailed above. The valve retractable and submersible options are available for most industrial measurement product lines although you should inquire to the factory to confirm that it is supported for your specific requirement.

Our CASE STUDIES are selected examples that illustrate just some of the capabilities of our novel modular, built-to-order, engineered electrochemical sensors & instrumentation as they are used in a wide variety of industries. A short description of each of our product areas is below as an overview of our offerings. Many more feature and functionality are available that detailed in our case studies or that matter the product webpages on this website. Please inquire to the factory with your specific needs so that we can optimized a measurement solution for your exact application.