Conc H2SO4, NaOH, HCl, mixed acids, and HF all impose strict wetted-parts constraints. Mismatching the material causes rapid corrosion and reduces meter life to months. This guide walks through chemical types.
Measuring concentration, not just density
Material selection keeps the meter alive; the right principle gets you the number. For online chemical concentration measurement — an acid concentration monitor, a process concentration sensor — match the method to the liquid:
| Liquid | Best principle | Model |
|---|---|---|
| Opaque / particle-bearing (slurry acids, neutralization) | Density — acoustic impedance | PS7000 |
| Clean binary acid/alkali, high accuracy (H2SO4, HCl, NaOH) | Sound velocity | PS7020 |
| Clear liquids, Brix-like / refractive ranges | Refractive index | PS7110 |
| Multi-component baths (e.g. HF + H2SO4 + H3PO4) | Spectroscopic (UV-Vis-NIR) | PS7100 |
Related: chemical / fine chemical · semiconductor multi-acid baths · optical concentration meters. Tell us your medium for a recommendation.