LabSen® 241-3SP pH electrode for protein-containing micro samples


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SKU: 28APE190366 / AI3151 Categories: , , ,

The LabSen® 241-3SP pH electrode for micro samples from Apera Instruments is manufactured using patented Swiss sensor technology and materials. It is particularly suitable for measuring small volume samples (>30 μl) in NMR sample tubes, microtiter plates, microcentrifuges and other thin vessels. With a suitable microvolume container (sold separately), samples up to 15 μl can be measured.

Long-life reference system – The LabSen 241-3SP pH electrode uses a long-life reference system consisting of a glass tube, AgCl and a reference silver wire. The top of the thin glass tube is filled with cotton, which prevents the reaction between AgCl and electrolyte when the temperature changes. It improves the stability of the reference electrode and extends the life of the electrode.

Protelyte Electrolyte – The electrolyte used is a special oily reference solution designed for measuring protein solutions and viscous solutions.

Unique glass membrane – The electrode has a special cylindrical micro-electrode tip (tip ø3mm, steel tube ø4mm) and can be used at temperatures up to 100°C. A stainless steel sheath ensures that it is protected against damage in the event of impact, despite its thin shape.

  • pH sensor technology and materials from Switzerland
  • Special cylindrical LabSen sensor tip for micro volumes (>30 microliter)
  • Electrode is protected by a steel sheath
  • Long-life reference system that improves the stability of the reference electrode and extends the life of the electrode
  • Suitable for measurements in NMR tubes
  • With microcontainer measurements up to 15 μl possible

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.

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

Technical Specifications

Measuring range (0 ~ 14) pH Electrolyte Protelyt
Recommended operating temperature (0 ~ 100)°C Storage solution Protelyt
Diaphragm type S Membrane resistance <450MΩ
Shank material Lead free glass Electrode dimension Electrode (Ø12×130) mm

Measuring tip (Ø3×16/ Ø4×54) mm

Reference system Long Life Connection BNC
Diaphragm Ceramics Cable Ø3mm×1m



Compatible measuring devices