pH and ORP: Solutions and spare parts
Components in contact with the measured medium always wear out to a greater or lesser extent. Long-term accurate and reliable measurement therefore requires maintenance. Depending on the type of sensors used, this mainly involves regular calibrations, replacement of worn parts, or entire sensors (where applicable).
You can easily handle a number of these common tasks yourself, saving time and costs. You can find the relevant procedures in the user's manual of the individual products, or we can also advise you over the phone. Below you will find the necessary materials.
pH buffers
Buffers are used for calibration of pH sensors. The IEC (NBS) buffer set pH 4.01 - 6.87 - 9.18 is suitable for basic measurement range. Buffers are supplied in bottle sets 3 x 100 ml, 3 x 500 ml or 3 x 1000 ml, or as separate bottles.
| Recommended set | Other available buffers | |
| pH 1.68 ± 0.05 | pH 3.56 ± 0.05 | |
| pH 4.01 ± 0.02 | pH 6.00 ± 0.05 | |
| pH 6.87 ± 0.02 | pH 7.00 ± 0.02 | pH 7.41 ± 0.02 |
| pH 9.18 ± 0.02 | pH 10.01 ± 0.05 | pH 10.90 ± 0.05 |
| pH 11.88 ± 0.05 | pH 12.83 ± 0.05 | |
Buffers pH 3.56 4.01 6.87 7.41 9.18 are primary IEC (NBS) buffers, 1.68 is primary IEC (NBS) standard for low pH range, 10.01 is supplementary IEC (NBS) standard, 6.00 7.00 10.01 10.90 11.88 12.83 are standardized against IEC using a glass pH electrode. The listed values are valid at 25 °C.
ORP reference solution
The reference solution is used to calibrate ORP sensors. The listed ORP value is valid at 25 °C, with the Ag/AgCl reference electrode.
| Product code | Value | Bottle sizes |
| SS ORP 11 | 225 mV | 100 ml, 500 ml, 1000 ml |
| SS ORP 12 | 252 mV | 100 ml, 500 ml, 1000 ml |
| SS ORP 13 | 468 mV | 100 ml, 500 ml, 1000 ml |
Auxiliary solutions for pH, ORP and ISE sensors
We can also supply further auxiliary solutions, useful for maintenance of pH and ORP sensors, or for ISE measurements:
- Deproteining solution for cleaning pH sensors
- Non-ionic detergent for cleaning pH sensors
- Storage solution for pH and ORP sensors
- Reference solutions and salt bridge solutions
- Conditioning solutions, Ionic Strength Adjustors for ISE measurements