How Does A pH Meter Work?

Answer 1

A pH meter is basically an electronic device that can appropriately measure the acidity of a particular liquid by utilizing specific probes that are often used to examine the pH of substances of a semi-solid nature. In most cases, a standard pH meter will have within it a measuring rod, made of glass, which connects to a meter detailing the pH outcome.

The hydrogen ions are covering the thin glass bulb of the probe, and the overall activity is measured. Only a tiny voltage is produced, namely 0.05 per pH unit, which can be found on the meter.

As far as the meter circuit is concerned, pH units show up on the voltmeter instead of the common volt measurement. When it comes to the circuitry involved, basically several operational amplifiers are in a backward setup and consists of a voltage around -17, at which point, the inverter converts the tiny voltage derived out of the probe into pH units.

In each and every case, the pH meter needs to be calibrated just before measuring or at least at the start of every day. Basically, the glass electrode cannot give the proper e.m.f. over a consistent period of time. The way that the proper calibration takes place is to have two basic buffer solutions, and they should in fact span the entire gamut of pH values for measurement; in standard instances, pH 4 and pH 10 are okay.

The calibration setup connects the amount of voltage produced by a probe with the appropriate pH scale. After every type of measurement, the probe needs to be immersed in distilled water in order to effectively remove remnants of the solution that is being measured, and then it should be wiped with a dry tissue to pick up any excess water that could affect the sample, and lastly it needs to be placed quickly back into an additional solution. The probe has to remain wet when not in use, namely anything resembling an acidic substance of about pH 3.0. It is possible to use tap water in an emergency situation—but it is definitely not recommended.

Answer 2

A pH meter is the same as a voltmeter, look up them for more information.