Hanna Instruments HI5311 Glass Ag/AgCl Reference Electrode, For General Purpose and Titration, 4mm Banana Connection

The Hanna Instruments HI 5311 electrode is a silver/silver chloride (Ag/AgCl) double-junction half-cell reference electrode for use with half-cell measuring electrodes (sold separately) in titration and other water testing applications. Titration is the gradual adding of measured amounts of a substance with an unknown concentration into another substance with a known concentration until the reaction between them is complete. The double-junction reference protects against silver wire contamination and helps prevent clogging when testing dirty water and solutions with heavy metals or organics. The electrode has a ceramic junction for durability in demanding applications. Its glass body withstands corrosive materials and solvents, and is refillable, allowing the filling solution composition to be adjusted to suit the sample requirements. It withstands temperatures from -5 to 100 degrees C (23 to 212 degrees F).

The electrode is 120mm long and has a 1m cable with a 4mm banana jack connector for attaching to compatible meters. Reference electrodes are used in conjunction with measuring, also known as indicating, electrodes to complete electrochemical cells so that measurements can be made.

An electrode, also called a sensor or probe, is an instrument used with a meter to test and measure parameters of a substance. All electrodes are probes or sensors, but not all probes are electrodes or sensors. Probes, such as temperature probes, are used to penetrate a material for measurement. Common electrode types are pH, total dissolved solid (TDS), oxidation reduction potential (ORP), and ion selective electrode (ISE). They come in standard models or in all-in-one (sometimes called 3-in-1) models, which have a built-in temperature sensor for automatic temperature compensation (ATC). Electrodes can be half-cell or full- (also called combination) cell type. They can be refillable or non-refillable. Housing material is typically glass or epoxy, and sensors are commonly made with stainless steel or a glass bulb. pH electrodes, which measure the pH of a substance, often have a glass bulb. The bulb senses hydrogen ions, and generates a millivoltage that is picked up by the filling solution and transferred to a wire that connects to the pH meter. ORP, also known as redox, electrodes measure dissolved oxygen in aqueous solutions to determine the level of contaminants and their ability to act as oxidizing or reducing agents. Ion selective electrodes (ISEs) respond selectively to ions in the presence of other ions. Electrodes are commonly used by researchers, manufacturers, and hobbyists in a wide variety of industries, such as aquaculture, agriculture, chemistry, food and beverage, wine-making and water-testing, and for scientific applications. An electrode can be used with a datalogger to assist in temperature measurement.

Hanna Instruments manufactures analytical instrumentation and supplies, including pH meters, electrodes, chemical reagents, and buffer solutions. The company, founded in 1978 and headquartered in Woonsocket, RI, meets International Organization for Standardization (ISO) standard 9001.

What's in the Box?

• Hanna Instruments HI 5311 electrode
• 1m cable