HM Digital ORP-200 Waterproof Professional Series Handheld Meter, White/Green, ORP

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When it comes to swimming pools, ORP levels can usually be adjusted by adding more active chlorine to the water to boost its antioxidizing potential. More sophisticated water purification systems may involve a more complex balancing of total dissolved solids (TDS) in water to achieve a more favorable oxidation reduction potential. The fact that molecular hydrogen is the therapeutic ingredient in ionized water eluded scientist for decades. 9It is no wonder that misconceptions of ORP have been promulgated over the years. Some have suggested that the reading is due to free electrons, actual physical charges on water molecules, charged or ionic minerals, 10and virtually everything else except for molecular hydrogen. AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately) All glass electrodes have a bulb which must be kept hydrated and a reference junction which must be kept wet to prevent excess leakage of the internal electrolyte solution from the reference junction. It is recommended keeping the electrodes in a storage solution between uses. Special cleaning solutions are also available to ensure electrodes are free from contamination or build-up which can affect performance and shorten the lifespan of the electrode. The electrolyte within some reference electrodes must also be refilled periodically. Other electrodes are gel-filled or "low-maintenance" and do not require refilling.

While for most applications ORP measurement is concerned with oxidizers for their sanitizing effect, there has been increasing interest with reducers. Free radicals are atoms and/or molecules with an unpaired electron. Introduced to our bodies as byproducts of biochemical reactions and from the air we breathe and food we eat, free radicals are unstable and desire balance so they try pull electrons (oxidize) from wherever they can. In acquiring balance for itself, the free radical damages other biological molecules in the body. Reducers, also known as antioxidants, donate the electrons sought by free radicals thus minimizing the degenerative effects of free radicals on the body. pH stands for "potential of hydrogen" and is a measure of hydrogen ion concentration. A high concentration of hydrogen ions results in acidity while a low concentration results in alkalinity. The concentration of hydrogen ions is represented on a scale from 0 to 14 with 7 being neutral (i.e. an equal number of hydrogen (+) ions and hydroxide (-) ions to cancel each other out). Values below pH 7 are acidic and values above pH 7 are alkaline. The scale is logarithmic, meaning each full point increases or decreases by a factor of 10x. Some extreme substances can score lower than 0 or greater than 14, but most fall within the scale. Calibration - up to a five-point calibration with seven standard buffers and five custom buffers available.

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You may have heard of ORP, but what does it mean and what role does it play in water-quality testing? We’ve laid out the basics of ORP to help you get up to speed. Chemicals like chlorine, bromine, and ozone are all oxidizers. It is their ability to oxidize - to "steal" electrons from other substances - that makes them good sanitizers because in altering the chemical makeup of unwanted substances, they render those substances inert. Of course, in the process of oxidizing they use up their ability to further oxidize things. Accuracy of pH measurements is dependent upon well maintained and properly calibrated instruments. The main factors that degrade the performance of an electrode are coating, contamination and aging. Necessary maintenance and calibration depends on these factors and, of course, of the accuracy required from measurements. These important points underscore the importance of actually measuring the molecular hydrogen concentration and making comparisons between hydrogen-water devices based off H 2concentrations, as opposed to pH and ORP alone. ORP Misconceptions SHIRAHATA, S. A. N. E. T. A. K. A. (2002). Reduced water for prevention of diseases. Animal Cell Technology: Basic and Applied Aspects 12, 25-30.

pH calibration on the meter is performed at either two or three points. You should calibrate with pH 7 buffer first then followed by either pH 4 and/or pH 10 buffers. The recommended frequency of calibration of pH is every 2 weeks. OSTOJI?, S. M., STOJANOVI?, M. D., CALLEJA-GONZALEZ, J., OBRENOVI?, M. D., VELJOVI?, D., ME?EDOVI?, B., KANOSTREVAC, K., STOJANOVI?, M. & VUKOMANOVI?, B. (2011). Drinks with alkaline negative oxidative reduction potential improve exercise performance in physically active men and women: Double-blind, randomized, placebo-controlled, cross-over trial of efficacy and safety. Serbian journal of sports sciences 5, 83-89. On the other hand, electrons that have a surplus of ions can afford to lose ions to oxidizing agents without becoming destabilized themselves. For this reason, they are referred to as antioxidizing agents, or reducing agents. The higher or lower an ORP reading (positive or negative), the more oxidizing or antioxidizing a substance is, respectively.

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If a substance doesn’t have enough electrons, it will actively attempt to acquire them through the process of oxidation—a chemical reaction in which one agent is oxidized (i.e., loses electrons to another agent). Because substances with positive ORP readings are looking to acquire electrons, they are considered oxidizing agents. ORP stands for oxidation reduction potential. It is a term that is usually found in the water treatment and food processing industry. ORP meters measure the cleanliness of the water and how it can break down contaminants. They work by measuring dissolved oxygen in the water. If there are more contaminants, there will be less dissolved oxygen as the contaminants will use up the oxygen particles, thus resulting in a lower ORP level.