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

£9.9
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HM Digital ORP-200 Waterproof Professional Series Handheld Meter, White/Green, ORP

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

RRP: £99
Price: £9.9
£9.9 FREE Shipping

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Description

Oxidation reduction potential, or ORP, is a measure of a substance’s ability to either oxidize or reduce another substance. It is measured by the electrodes of an ORP meter. A positive reading on an ORP meter means that the substance is an oxidizing agent; a negative reading indicates that the substance is a reducing agent. The redox probe is able to measure this electromotive force for electrons to pass from the reduced species to the oxidized species. In our vitamin C example, if the concentration of the oxidized and reduced forms of ascorbic acid are the same, then we will measure an ORP voltage of -570 mV. This is according to the standard redox half-reaction: Kotz, John C., Paul M. Treichel, and John R. Townsend. Chemistry & chemical reactivity. Cengage Learning, 2011.

ORP readings are measured in mV and range from -2000 mV to 2000 mV. Values above zero indicate an oxidizing substance while values below zero indicate a reducing substance. Values do not indicate the concentration but rather the potential of the substance to oxidize or reduce.

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.

All pH meters require calibration from time to time. They should be calibrated at a minimum of two points. Most manufacturers offer buffer solution at specific pH levels for calibration. For most applications, pH 7.00 and 4.00 (or 7.01 and 10.01 for alkaline values) are suitable for calibration. The log-on demand feature allows users to store up to 200 sample that can be later transferred to a PC with the HI-920015 USB cable and HI-92000 software. The advanced four-electrode cell for conductivity/resistivity/TDS eliminates polarization, allowing greater accuracy and stability with minimal maintenance. 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. 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.

In alkaline ionized water, the ORP ranges from -100 mV to – 900 mV. 7 The chemical species responsible for the negative ORP is the redox couple molecular hydrogen (H 2) and the acid ( H +) concentration. This is according to the standard redox half-reaction: ORP measurement is important for many applications such as drinking water, swimming pools and spas maintenance, cooling tower disinfection, groundwater remediation, bleaching, cyanide destruction, chrome reductions, metal etching, fruit and vegetable disinfection and de-chlorination. ORP is also the only practical method we have to electronically monitor sanitizer effectiveness. For more information about how to interpret ORP readings and use ORP meters, research your chosen ORP meters and its unique features.

AA batteries: 2,000 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately) 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. ORP electrode acts as an electron donor or acceptor. If the contaminants in water are reductant, then the ORP electrode acts as an acceptor. If the contaminants are being oxidized then the ORP electrode acts as a donor. During this electron transfer, the potential difference is generated owing to the electromotive force. This potential difference is measured by the Aqua-logger or Aqua-meter to give a reading according to the ORP scale. Therefore, ORP meters are also known as differential ORP probes. 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. Oxidation reduction potential meters are often used to control the disinfection with chlorine or chlorine dioxide in water systems such as swimming pools, potable water supplies, and a lot more. It is also used in the process of wastewater treatments so that it can help remove the contaminants. Best price of ORP meters in AustraliaThe ORP meters are the devices designed for the measurement of the oxidation-reduction potential of water. ORP meters are also industrially known as a redox probe. These chemical or microbial species form redox couple, which results in electron loss. The ORP meters measure the number of electrons lost as a merit of the redox potential of the water.

pH measurements are important in medicine, biology, chemistry, agriculture, forestry, food science, environmental science, oceanography, civil engineering, chemical engineering, nutrition, water treatment & water purification, and many other applications. pH meters generally consist of a glass electrode connected to an electronic meter that measures and displays the pH reading. Meters can range from units that combine all the parts into a simple, handheld unit or more complex, laboratory-quality instruments that provide highly accurate readings and a host of other functions. Because of the close relationship between pH and ORP, there is a scale that takes into account the ratio (mV) ORP/pH, the rH scale. The rH range varies from 0 to 42, where the extreme values represent the reducing effect of an atmosphere of pure hydrogen (rH=0) and to the oxidizing effect of an atmosphere of pure oxygen (rH=42), respectively.AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately) Now that it discussed where and when one can use the ORP meters, then let us take forward to how ORP Meter works. Measuring electrodes are made of platinum or gold, which due to their low resistance, will lose electrons to an oxidant or accept electrons from a reductant. Voltage is produced as electrons are added or subtracted. The reference electrode, usually made of silver, is surrounded by an electrolyte solution that produces another tiny voltage. But the voltage produced by the reference electrode is constant and stable, so it forms a reference against which the voltage generated by the measuring electrode may be compared. The more oxidizer or reductant available, the greater the voltage difference between the solutions. The platinum sensor is often preferred because it is mechanically simpler and safer to produce. Platinum can be welded to glass and has the same thermal coefficient. Sensors made of gold cannot be welded to the glass and are often placed in plastic supports applied to the glass or plastic tube by means of tiny elastomeric bungs. The gold or platinum sensor signal is carried through the electrode body, and together with the reference signal is conducted to the measurement meter via a coaxial cable with BNC connector.



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