![]() Using a pH meter is pretty straightforward. Now let’s talk about how a pH meter is calibrated to get accurate results. The ions which attached to the surface of the glass electrode are what allow the determination of pH levels.īut don’t be too confused, all of those happened to measure pH levels: whether a solution is acidic or alkaline. Some of the metal ions from the glass electrode move into the solution. This is where the hydrogen ions in a solution move toward the surface of the glass electrode and replace some metal ions. Your pH meter is able to measure because of its two parts: first, the meter itself which is like a moving-coil or digital meter, and your probes (electrodes) which have a silver-based electrical wire and are put in a solution to measure pH level through a phenomenon called ion-swapping process. It measures voltage (electrical potential) of an acidic solution and compares it to the voltage of another solution where the difference in its voltage (potential difference) between the two allows the determination of the difference in pH levels. Because of this, pH meter works like a voltmeter: Meaning, it’s like a battery that can produce voltage. A basic understanding of pH level is that when you detect pH levels of less than 7, the solution is identified as acidic while those pH levels higher than 7 are alkaline.Īn acidic solution has far more positively charged hydrogen ions in it than an alkaline one, so it has greater potential to produce an electric current in a certain situation. It is often used to measure acidity in soil, water, winery, also even in manufacturing, healthcare, and clinical applications that require pH chemistry. A pH meter is a device you probably will first use, have used or been using for a really long time already but its purpose is basically to measure the changes in the activity of hydrogen ions in a solution, particularly its concentration levels. In this article, the goal is for you to learn the warning signs your pH meter is imploding and find out the 7 variables that will help you replace it with something that actually might last forever. Storage beyond 3 years may be possible if sensor's response time, slope, and asymmetry potential are within the user's acceptable limits. Meters offer CE, TUV 3-in-1 and FCC Class A certificationsĭisclaimer to internal research use restriction: Any restrictions on the purchaser to utilize the product(s) for internal research purposes only does not apply to the product(s) on the web pages associated with this statement.Even with proper care and maintenance, most pH electrodes usually last just 1-3 years.Meter kits include hard-sided field case and protective meter armor with electrode holders, adjustable wrist/belt strap and built-in meter stand.IP67-rated housing is waterproof for rugged field operation.Flexible power options with AA batteries or optional universal power adapter.Orion Star Com software facilitates data transfer to a computer via USB or RS232 connections.Non-volatile meter memory ensures your data and settings are protected, even with loss of power. ![]() Data log collects and date/time stamps up to 1000 measurement sets.Capture your critical readings with measurement stability indicator and selectable read modes - Auto-Read holds a stable reading and Continuous shows changing readings with hold option.Informative, easy-to-read backlit graphic display with clear onscreen instructions simplifies operation.Perform up to a 5 point pH calibration using automatic buffer recognition of NIST or DIN buffer groups with choice to manually enter custom buffer values.Measure pH, mV, relative mV or ORP with temperature.This waterproof, portable meter displays critical data with your measurement including temperature, date and time, read type, measurement stability, active calibration info and power source status. Orion Star A221 Portable pH Meters are designed to offer the reliability you need in a user-friendly package for your dedicated pH testing needs. Don’t leave your measurements to chance when analyzing samples outside the lab.
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