LabSen® 221 pH electrode for viscous and low-concentration solutions


Plus 19% MwSt. DE
SKU: 28APE190258 / AI3102 Categories: , , ,

The LabSen® 221 pH electrode from Apera Instruments is manufactured using proprietary Swiss sensor technology and materials. It was specially developed for pH measurement of viscous solutions and solutions with low ion concentration and is particularly suitable for titration. The electrode is compatible with TRIS buffer solutions.

LabSen S-Type Hemispherical Glass Diaphragm – Thanks to the low-resistance and rugged glass diaphragm, the electrode delivers fully stabilized readings in 15 to 30 seconds, yet is up to 10 times more rugged than conventional products, significantly reducing the likelihood of the electrode breaking during impacts.

Movable sleeve – The easy-to-clean diaphragm sleeve allows the infiltration rate of the electrolyte to be adjusted and thus adapted to the ion concentration of the sample.

  • pH measurement technology and material from Switzerland
  • Unique blue hemispherical membrane
  • Adjustable infiltration rate via movable sleeve
  • Durable reference system
  • TRIS buffer compatible

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 Reference electrolyte 3M KCl
Recommended operating temperature (-5 ~ 100) °C Storage solution 3M KCl
Shank material Special Glass Lead Free Membrane resistance <150 MΩ
Glass membrane type S Electrode dimension (Ø12×130) mm
Reference system Long Life Connection BNC
Diaphragm Movable sleeve Cable Ø3mm×1m



Compatible measuring devices