pH and ORP Probes
pH (hydrogen ion concentration) and ORP (oxidation reduction potential) are both critical measurement and control parameters for many liquid processes. Hamilton Process Analytics offers a wide selection of pH probe and ORP probe solutions for use in all bioprocesses, as well as many other industries that require high accuracy and reliability from their probes. Hamilton is one of the few manufacturers to have multiple pH membrane glass bulb options and reference designs to tailor the probe for the specific application.
Browse All pH Probes
Pre-Pressurized pH & ORP Probes
Designed for measurement in hygienic installations, pre-pressurized pH probes and ORP probes from Hamilton solve the problem of reference poisoning and clogging which shortens the lifespan of standard sensors in many bioprocess applications.
Refillable pH & ORP Probes
Refillable pH probes and ORP probes offer the ability to replenish the reference electrolyte as it is consumed by the process. These probes offer exceptionally long life and stable, accurate measurements in harsh industrial applications.
Polymer-Filled pH Probes
Polymer-filled pH probes and ORP probes offer low maintenance and good chemical resistance for a wide variety of measurement applications such as water treatment, pulp and paper, and other industrial process measurements.
Viscous Liquid-Filled pH ORP Probes
Viscous liquid gel-filled pH and ORP probes provide a suitable upgrade for the entry level electrodes used in many industries. The added viscosity of the electrolyte helps slow the ingress of process contaminants from poisoning the reference element.
Single-Use pH Probes
Hamilton OneFerm single use pH sensors rely on a proven glass electrode design that has been fully tested for gamma sterilization and dry storage.
Specific Applications
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App Note - Arc sensors in oncologic and biosimilar applications
Innoxtorres, a Spanish bioreactor manufacturer took advantage of Arc sensor technology to integrate EasyFerm Plus and VisiFerm DO sensors directly into their control system. -
App Note - pH in sugar refining
Pfeifer & Langen, a major German sugar manufacturer, uses Polilyte Plus pH sensors to monitor carbonatation in their plant in Jülich, Germany. -
App Note - pH measurement in E.Coli fermentation
The University of Applied Science in Hamburg, Germany tested the suitability of the EasyFerm Bio and its reference electrolyte Foodlyte in E.Coli fermentation processes to demonstrate the biocompatibility of it.
Resources
Hamilton's knowledge base provides a range of explanatory articles, frequently asked questions, and document downloads.
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Flyer - Single-Use Sensors
With Hamilton's new breed of sensors specifically designed for single-use applications, you can now expect the same precise and hassle-free measurements in your single-use processes.
Featured FAQ
What is the difference between pH and ORP?
pH and ORP sensors look alike but have different measurement principles. pH sensors rely on a glass membrane that produces a voltage signal in relation to the hydrogen ion concentration in the liquid. The concentration of acids or bases affect this hydrogen ion concentration thus influence the pH measurement. ORP sensors measure of the overall level of oxidizing or reducing substances present in the liquid. The ORP measurement is not specific to any single ion in the liquid thus the response is based on the net presence of these chemicals.
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What is the expected lifetime of my pH sensor?
Expected pH sensor lifetime is dependent on the application. Exposure to strong chemicals, elevated temperature, fluctuating pressure, and solid build-up can all impact the sensor life. As the sensor ages, a sluggish response may become more apparent, and will require more frequent calibrations to compensate for this change. The overall health of the Arc pH sensors can be seen using the quality indicator in ArcAir software. Click to learn more about sensor lifespan and expiration in the Knowledgebase article. -
What solution should I store my pH or ORP probe in?
Hamilton recommends storing pH and ORP probes wet in either Hamilton Storage Solution (Ref 238931) or in 3M KCl solution. Click to see the pH/ ORP Sensor Storage and Regeneration Knowledgebase for more information. -
How do I clean an ORP sensor?
The platinum band around the tip of the ORP sensor can oxidize over time. Light scrubbing with a mild abrasive such as toothpaste will remove the oxidization. Rinse with potable water and store in storage solution prior to usage
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Tips to Improve pH Measurement
Accurate pH control is fundamental for a wide variety of industrial bioprocesses. Some of those processes are based on cell or microbial cultures where the pH value has to be kept within a narrow range. This Video shows the three most helpful tips to ensure optimal growth and product yield. -
pH Basics Video
Ever wonder how pH sensors work? This video discusses basic design and functionality of glass membrane combination pH sensors. -
ORP Calibration Basics
This article discusses the basic design or ORP sensors and the need for proper calibration procedures.
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