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

Measurement Product Line Overview

Smart MODBUS Sensors & Touchscreen Controllers

Smart Digital MODBUS pH, ORP & Dissolved Oxygen (D.O.) 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) when used 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 pH, ORP & Dissolved Oxygen (D.O.) 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 from slurry/viscous solutions, sulfides, high-temperature, organic applications with various solvents, HF etching and treatment systems & many more. Unique features include low-profile break-resistant parabolic thick-wall pH glass elements and platinum ball ORP sensing elements. Special reference option for extreme dehydration resistant allows for intermittent wet & dry use and prolonged exposure to air without drying out. The pH sensors & ORP sensors with integral analog preamplifiers are available with optional rugged field ready waterproof quick disconnect Q7M snap connectors. Smart digital pH sensors & ORP sensors come standard with NEMA 6P rated quick disconnect HiQ4M snap connectors. Support for pressures up to 200 psig and temperatures up to 150 degrees Celsius.


Industrial Ion Selective (ISE) Sensors

Most complete and rugged line of industrial ion selective sensors offered anywhere. Continuous inline measurement of ammonium, calcium, lithium, sodium and silver cations and fluoride, chloride, bromide, iodide, cyanide, nitrate, nitrite and perchlorate anions. Available in inline, immersion, fully submersible, twist lock quick disconnect, sanitary and HOT-TAP valve retractable installation configurations. Ion selective (ISE) measurement systems are supplied complete including sensor and transmitter calibration scheme that is optimized for the intended application use. Unique AB 6100 fluoride ion selective sensor is the only type in the industry that is suitable for low pH acid/etching solution at elevated temperatures and to undergo strong acid cleaning regimen. Validation of process for feasibility is required for each ISE measurement. Generally only an offset calibration with the ISE sensor left in continuous field service is needed to allow for good agreement with offline grab sample determinations, most typically analyzed with a portable photometer.

Industrial Conductivity Sensors

Contacting and torodial (inductive contactless) industrial conductivity sensors for use up to 205 degrees Celsius and 500 psig. Suitable for measurements from 0.55 microSiemens and up to 2,000 milliSiemens. Applications from ultrapure water to strong acids, bases and electrolytes. Materials of construction include 316SS, Monel, Titanium, Hastelloy C-276 (and other) for the electrodes and TEFLON, CPVC, KYNAR and PEEK for the insulator on contacting conductivity sensors (other materials upon request). Cell constants available from 0.01 to 20.0 and anywhere in between to suit any measurement requirements. Custom configurations and designs are available upon request for any applications that are not serviced by the existing sensors detailed on our website (MOQ may apply).

Industrial Dissolved Oxygen Sensors

AST-DO-UNIVERSAL Rugged Industrial Galvanic Dissolved Oxygen Sensors with High Stability Thick Membranes for Inline, Immersion, Submersion, Sanitary & HOT-TAP Installations. 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. Available in without preamplifier configuration for use with up to 15 meters (50 feet) cable or with integral analog conventional preamplifier configurations are rated for use with up to 100 meters (330 feet) total cable length. The with integral preamplifier AST-DO-UNIVERSAL DO sensor configurations are available with optional rugged field ready quick disconnect NEMA 6P rated Q7M/Q7F snap connectors. Smart Digital MODBUS RTU dissolved oxygen sensor configurations allow for seamless hot-swap plug and play operation and include waterproof snap connectors standard with cable lengths up to 1,000 meters (3,280 feet) supported.

Industrial Instrumentation

Offering a wide range of instrumentation options from low-cost 2-wire and 4-wire transmitters and controllers all the way to intrinsically-safe explosion-proof & programmable instrumentation for single, dual and triple channel pH, ORP, ion selective (ISE), conductivity and dissolved oxygen (DO) liquid analytical measurements. Options include PID & TPC relay controllers, HART, Fieldbus, Profibus & MODBus digital outputs as well as multiple isolated, configurable, reversible & scalable 4-20 mA analog current loop outputs. Available in IP65, IP67 and NEMA 4X rated enclosure options suitable for wall & plate, panel and pipe mounting in the field. Quick disconnect NEMA 6P rated waterproof and corrosion resistant snap connectors are available an available option for analog sensors with integral preamplifiers (Q7M/Q7F ) and for all smart digital sensors (HiQ4M/HiQ4F).

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.