There are different types of combination electrodes. The basic pH sensing system does not change.
The sealed chamber contains a pH7 buffer solution. The glass bulb measures the potential, mV, of the solution. The meter converts the mV signal to a pH value on the display.
The reference type can change, according to the sample being measured.
The reference filling medium can be liquid or gel.
It may have a single or double junction.
The electrode may have a glass or plastic housing.
The pH glass may be shaped to meet application requirements.
For example, flat surface or spear type.
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