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

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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. Easy to calibrate- read more here. When calibration is necessary, display prompts simplify pH calibration and make sure the correct buffer is being used. AA batteries: 2,000 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)

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: Similar to the manner in which acidic or alkaline solutions are quantified by pH measurements, solutions can also be graded as oxidizing or reducing based on measurements of ORP (oxidation reduction potential often called "redox"). The ORP electrodes are designed to 0mV reading that is null reading at 7pH. As the pH value deflects over or below 7, the deflection in ORP is seen. The extreme range of ORP meter reading remains between -1500mV to1500mV. 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. User adjustable temperature compensation (up to 9.99%/°C) which also allows TC to be disabled for applications requiring non-compensated readings.

Designed for universal applications, HI-98190 measures pH/ORP and temperature. Exchange out the pH probe for an ORP probe to obtain mV readings in the ±2000 mV range. 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. ORP calibration with the ultrameter is not necessary. Due to the hazardous nature of ORP chemical standards, the ultrameter features an inbuilt electrical calibration. Frequency: Never. Oxidation-reduction potentialcan be measured using a potentiometer (voltmeter) or an ORP meter. 1 Water produced from electrolysis (ionized water), as well as other forms of hydrogen water, exhibit a negative ORP. 2 But what is the meter actually measuring? And how does it work? When an oxidizing and/or reducing agent is dissolved into an aqueous sample, they may react with materials present and produce a voltage, or electromotive force (EMF), that is related to the ratio of oxidized to reduce species in the sample. An electron exchange can develop between this solution and an inert metal sensor immersed in the solution, and the voltage can be measured (when compared to a reference electrode) with a pH/mV meter. This type of measurement is known as redox or ORP. The units of measurement are in mV.

Now that it discussed where and when one can use the ORP meters, then let us take forward to how ORP Meter works. Basically *you have different chemical species in the water that can either undergo oxidation or reduction; these form “redox couples”. 3For example, adding ascorbic acid (vitamin C) to water gives a negative ORP 4based on the ratio of reduced ascorbic (HA) acid to oxidized ascorbic acid (DHA) according to the Nernst equation. 5 Alternatively, a consultation visit from one of our highly experienced product specialists is available for this range. Typically our specialist will be able to go through the following aspects with you to help you make the right choices and be able to deliver them on time and and on budget.

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: The working principle of an ORP meter or redox meter is quite simple. It is a measurement of water’s capacity for electron transfer. The ORP meter consists of an electrode that is used as a probe or sensor to measure the redox potential of water. The working is similar to pH measurement. Just like the pH of a solution is measured based on hydrogen ion activity, the ORP measurement is a result of electrons’ movement inside the water. Depending on the quality of water, the