Hanna Instruments HI60501 PVC Industrial pH and ORP Electrode Holder

The Hanna Instruments HI 60501 industrial electrode holder secures pH and oxidation reduction potential (ORP) electrodes in vessels, tanks, plating baths, and other immersion installations. It is for use with Hanna Instruments 3/4" National Pipe Taper (NPT) threaded industrial electrodes (sold separately). The holder can be adjusted for immersion at a minimum depth of 10cm to a maximum depth of 70cm. It is made of PVC for corrosion resistance and has a Buna-nitrile O-ring that forms a seal with the electrode for secure installation. It withstands temperatures from -10 to +60 degrees C (23 to 140 degrees F).

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