Reference
Last revision 2026/01/12
This article discusses the correlation between output voltage and pH values at 25°C, offering detailed operation and maintenance instructions for laboratory pH probes, ensuring proper use and longevity.
Principle
The relation between the output voltage and the pH value is shown as followed (25 ℃):
| Voltage (mV) | pH Value | Voltage (mV) | pH Value |
|---|---|---|---|
| 414.12 | 0.00 | 59.16 | 6.00 |
| 354.96 | 1.00 | 0.00 | 7.00 |
| 295.80 | 2.00 | -59.16 | 8.00 |
| 236.64 | 3.00 | -118.32 | 9.00 |
| 177.48 | 4.00 | -117.48 | 10.00 |
| 118.32 | 5.00 |
Operation and Maintenance Instructions
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It is forbidden to measure hard solid samples and semisolid samples containing sharp particles.
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Please keep the plug of the probe, signal transmitter board (especially the BNC connector) clean and dry.
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This pH probe is a laboratory electrode, which is not suitable for prolonged online testing. Therefore, do not immerse the electrode in the measured object for a long time.
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After using the pH probe, please clean it carefully.
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The components of this probe which touch the measured objects have a black ABS shell, a glass component and a silicone rubber material. Before testing the object, it is necessary to confirm that the measured objects are not harmful to these materials.
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Not suitable for measurement: oily samples, samples with higher viscosity, samples with more fine particles.
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Not suitable for non-aqueous titration.
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The head of the stainless steel spear tip is sharp. Please use safety when using it.
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