LabSen® 831 pH electrode for strongly acidic solutions and hydrofluoric acid (HF)


Plus 19% MwSt. DE
SKU: 28APE190270 / AI3109 Categories: , , , ,

The LabSen® 831 pH electrode from Apera Instruments is manufactured using proprietary Swiss sensor technology and materials. It is specially designed for measuring solutions containing hydrofluoric acid (≥3pH) or other strongly acidic solutions.

LabSen HF Glass Diaphragm – The special hemispherical glass diaphragm allows precise, fast and reproducible measurements of highly acidic solutions and is resistant to hydrogen fluoride corrosion (1g/L). It is up to 10 times more robust than conventional products, minimizing the likelihood of the electrode breaking during impact.

Silver Ion Trap Reference System – In addition to the Long Life Reference System, a silver ion trap is incorporated into the LabSen 831 pH electrode to prevent blockage or contamination of the diaphragm by silver sulfide.

  • Patented pH sensor technology and materials from Switzerland
  • Especially for pH measurement of hydrofluoric acid (≥3pH) or other strongly acidic solutions
  • Resistant to hydrogen fluoride corrosion (1g/L)
  • Silver ion trap reference system prevents contamination of the electrode
  • Glass membrane up to 10 times more robust than conventional products
  • Blue gel electrolyte, does not flow and does not cause air bubbles

The electrode uses a BNC connector that is compatible with all pH meters that use BNC connectors, such as Apera Instruments PH850, PC850, PH8500, PC8500, PH700, PH910, PC910, PH950, PC950,PH800, PH800, PC800, PH820 and PC820. A temperature sensor is not integrated. For automatic temperature compensation, a separate temperature sensor (e.g. Apera Instruments MP500) is required, or the temperature must be entered manually. The LabSen 831 is the replacement electrode for the PH850-HF and PH8500-HF from Apera Instruments.

This electrode has a 6-month manufacturer’s warranty.

Technical Specifications

Measuring range (0 ~ 12) pH Electrolyte 3M KCl
Recommended operating temperature (0 ~ 100) °C Storage solution 3M KCl
Shank material Lead free glass Membrane resistance <400MΩ
Diaphragm type HF Electrode dimension (Ø12×120) mm
Reference system Silver ion trap Connection BNC
Diaphragm Ceramics Cable Ø3mm×1m



Compatible devices