Measuring pH levels is a quite simple and straightforward process. Measuring pH is for environmental monitoring, plating wastewater treatment, and much more. Using an InstrumentChoice pH data logger for measuring pH level will provide accurate results for either short or long-term trends that will impact different factors. At the same time, it will also provide information for alarming, reporting, and quality control. But before you can start capturing accurate measurements, consider these three critical factors that will affect the accuracy of your pH data logger. In this article, we’re going to introduce these essential factors to give you some much-needed insight on the things you should consider when using a pH data logger for pH data collection.
Measuring pH Using a Data Logger
The voltage range of a standard pH meter is between +400 mV to -400 mV. It also corresponds to a pH range of 0 to 14 at standard room temperature. Any pH data logger should accept both negative and positive voltages. The device should also be sensitive enough for it to measure small increments of changes in voltage. Data loggers that provide full-scale input range of 1 or 2 volts will make sure sufficient resolution and accuracy to detect changes in pH levels of 0.1 to even a negative number.
The Consequences of Not Choosing the Right pH Data Logger
Keep in mind that the electrode wire has a very high impedance. That means since this voltage developed across an ion glass membrane, the level of current that the electrode supplies will be minimal. A standard InstrumentChoice pH data logger will have an input impedance of 1 Megohm, which is standard for common voltage measurements. However, when you measure the pH level, the current drawn by this resistance will produce large amounts of errors in the voltage readings. That’s why it’s incredibly crucial to choose a pH data logger that has high impedance.
Finally, know that these errors in the output voltage tend to worsen as you move away from a pH value of 7 as the temperature deviates from 26°C. For instance, measuring the voltage output of a probe that’s immersed in a solution of pH level 2 at 86°C without considering the temperature can potentially lead to errors and inaccurate readings that go as high as 9 pH levels. Make sure you choose a multichannel pH data logger that can read voltage and temperature and for better and more accurate readings. Click here to buy the best InstrumentChoice pH data logger.