How To Perform pH Metre Calibration

March 21, 2016

Are you wondering how you can easily perform metre calibration? You know that the procedure matters a lot and of course you want to make sure that it has been done properly so you get an accurate measurement. With that in mind, it pays to know how this process is one.

Make sure you have modern pH metres

Why are modern pH metres a good choice? You may ask. This is because of the fact that these systems have their way of guiding you, the user, when it comes to the different steps in calibrating a pH metre. With this feature in place, there is a lesser room for error in the process of calibrating. You should not forget, however, that not all modern pH metres will work as you have expected. It will still depend on who has manufactured the tool and that of the pH metre. Also, it will be best to refer to the pH metre’s user manual for the calibration process.

Use reference values when calibrating

Using reference values, otherwise known as buffers, will help you accurately conduct the procedure. These same reference values have specific pH values depending on different levels of temperature. Be sure that you are familiar with these values and the standards used for measuring each of them.

Prepare the pH metre for calibration

There are several things to remember when it comes to preparing the pH metre for calibration. One of the important things you should never miss out on is to make sure that the electrode has been properly cleaned. For those who have stored their electrode, ascertain that they can still be used. You must also check that the buffer solution and that of the sensor have the same temperature. If not, you should give them enough time to achieve temperature equilibration.

Follow the standards for calibration

The first thing you should do is to turn the pH metre on. After that, you should allow ample time for the metre to warm up depending on what has been specified in the metre’s operating manual. From there, you should select pH buffers (two reference values will be enough). You should select the first buffer at pH 7.00 with the second buffer selected close enough to the sample pH. For those of you measuring both basic and acidic samples using one pH calibration, make sure that you also use a multi-point calibration technique.

Use a product that will help calibrate the pH metre easily

The good thing about pH metre calibration is you do not have to rely a lot on your own capabilities on how to perform the task. Remember that you cannot just trust your instinct when it comes to performing this. You always have to use exact or precise measurements to achieve better results.

It is good to note that there are products that will make calibrating pH metres a whole lot easier. You just have to be familiar with how these products work and which of the many manufacturers in the market offer the best product.