pH Probes and ORP Probes
What are ORP and pH Probes?
pH probes (hydrogen ion concentration) and ORP probes (oxidation reduction potential) are both critical measurement and control parameters for many liquid processes. Hamilton Process Analytics offers a wide selection of high quality 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 of process sensors to have multiple pH membrane glass bulb options and reference designs to tailor the probe for the specific application.
Types of pH and ORP Probes
Pre-Pressurized pH & ORP Probes
Refillable pH & ORP Probes
Polymer-Filled pH Probes
Viscous Liquid-Filled pH ORP Probes
Single-Use pH Probes
Download our pH Measurement Guide
Get a better understanding of pH measurement in Hamilton’s comprehensive pH Measurement Guide. This 68-page booklet is intended for anyone with an interest in pH sensor technology or anyone who needs to implement pH sensors in controlled environments such as laboratories and industrial plants.
The guide covers the following essential topics:
- Definition of pH scale
- The NERNST equation
- The pH measurement system and measurement chain characteristics
- Applications, calibration, and maintenance of Hamilton's pH sensors
Specific Applications
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App Note - Continuous Cyanobacteria - Limnospora (Spirulina) Monitoring in the MELiSSA Loop using Dencytee
Drift free long term biomass monitoring for better understanding of process dynamics -
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
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Catalog - Process Analytics
Download the Process Analytics sensor catalog to learn about the complete offering of Hamilton process sensors and accessories. -
Brochure - BioPharma
Innovative solutions for process analytics in biotechnological and pharmaceutical industries.
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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 of ORP sensors and the need for proper calibration procedures.
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