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At AML Instruments, we have a full range of quality sensors and probes that cover your pH applications, from testing in a laboratory to use in the field. All our sensors are from the World leading manufacturer Mettler Toledo.
With over 30% of quality control measurements focusing on pH measurements, you must have a suitable pH sensor for your operating environments and intended type of testing.
pH sensors are continually used across multiple industries, such as wastewater, chemicals, food and beverage, pharmaceuticals, power plants and oil and gas.
Not only can AML Instruments provide you with the correct pH probes, but we can also help you with its maintenance and daily or weekly calibration consumables.
Please get in touch with us if you have any questions or require additional information about our sensors.
During regular working hours, you can contact our technical sales team on Tel: 01522 789 375 and outside of those hours, you could use our contact form, and we’ll get back to you ASAP.
Lastly, our live chat is in the bottom right-hand corner of this web page.
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Below are some common questions searchers ask when looking for probes and sensors.
A pH sensor is a part of a measuring device that tests the pH value of a liquid or solution. The pH scale measures the acidity or alkalinity of a solution. The pH scale ranges from 0 to 14, with 0 being the most acidic and 14 being the most alkaline. A pH sensor is used to measure the acidity or alkalinity of a solution so that the solution can be adjusted to the correct pH level.
For example, owners or managers of swimming pools need to record the pH levels through active monitoring to maintain the water quality so it’s safe to use.
The sensor consists of a glass electrode and a reference electrode, which are connected to a pH meter that measures the voltage between them. The glass electrode is sensitive to the hydrogen ion concentration of the solution, while the reference electrode is not. When the two electrodes are placed in a solution, the meter measures the voltage between them.
There are seven different types of sensors, ranging in cost and accuracy.
The accuracy and the cost of the sensor are directly linked. Accuracy generally ranges from +/- 0.1pH to +/-0.001 pH. If you are in the quality assurance and research field, you may need to purchase a sensor that is accurate to +/-0.001; if it’s for a school laboratory, then an accuracy of +/- 0.1 pH may suffice.
The sensor follows the pH value spectrum calculated using the potentiometric measurement principle. The pH sensor’s range is 0-14, with 0 being the most acidic and 14 being the most basic.
The resolution refers to the intervals over which the reading is taken. If the pH sensor’s resolution is 0.1 pH, the measurement of pH values is taken in increments of 0.1 pH.
A sensor does not show the pH value instantaneously, and it is common to wait at least 30 secs before you get a reading. However, if the electrode and the solution differ by 10 degrees, you will need to wait longer. Also, if the sensor has been stored in distilled water or left to dry out, the response time will be considerably slower.
The pH sensor is calibrated by measuring the sensor’s voltage output in response to a known pH buffer solution. The pH sensor is placed in the known pH solution, and the voltage output is measured. The voltage output is then compared to the known pH of the solution. The pH sensor is then adjusted to match the voltage output to the known pH of the solution.
If a probe/sensor has been correctly maintained, you should look to replace it every 18 months to 2 years. However, for those in the aquatic sectors, they will replace the sensors every nine months as they can not risk the effectiveness of their pH probes.
Please contact us if you want more information or a quote about our products or services.