Hi!
I recently purchased an Gravity Arduino pH meter. However when testing it, I would put it in different acids and bases, and it would give me the same reading. Would it be a coding issue, or a product issue?
Hello @amalweera
It could be any of the problems you mentioned. But let’s test if it is an issue related to programming.
Have you tried the sample code for testing the PH meter? You can find it here
Also, make sure you are following the instrcutions/precautions:
- Please use an external switching power supply,and the voltage as close as possible to the +5.00V. More accurate the voltage, more higher the accuracy!
- Before the electrode in continuous use every time,you need to calibrate it by the standard solution,in order to obtain more accurate results.The best environment temperature is about 25 ℃,and the pH value is known and reliable,close to the measured value. If you measure the acidic sample, the pH value of the standard solution should be 4.00.If you measure the alkaline sample, the pH value of the standard solution should be 9.18.Subsection calibration, just in order to get a better accuracy.
- Before the pH electrode measured different solutions, we need to use water to wash it. We recommend using deionized water.
- The electrode plug should be kept clean and dry.
- Measurement should be avoided staggered pollution between solutions, so as not to affect the accuracy of measurement.
- Electrode blub or sand core is defiled which will make PTS decline, slow response. So, it should be based on the characteristics of the pollutant, adapted to the cleaning solution, the electrode performance recovery.
- The electrode should not be long-term immersed in acid chloride solution.