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Spear-Type Glass pH Electrode APERA LabSen®251 for Semi-Solid Samples

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The LabSen® 251 Combination Spear pH Electrode, engineered with proprietary Swiss sensor technology and materials, is specifically designed for testing semi-solid and soft solid samples including cheese, butter, dough, and fruit.

  • Long-life Reference System – Glass tube design with AgCl and silver reference wire, cotton-filled upper end prevents electrolyte degradation during temperature fluctuations, extending electrode lifespan
  • Polymer Electrolyte – Solid polymer electrolyte minimizes contamination and eliminates maintenance requirements
  • Specialized Spear Glass Membrane – Ideal geometry for semi-solid sample penetration and testing capability up to 80°C (176°F)

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The APERA LabSen® 251 is a combination spear-tip pH electrode optimized for semi-solid sample analysis. It features a durable reference system combining a glass tube, AgCl, and silver reference wire, complemented by a polymer electrolyte and specialized spear-shaped glass membrane. The electrode delivers reliable pH measurements in soft and semi-solid matrices with temperature compensation capability up to 80°C (176°F).

Technical Specifications

Material Lead-free glass
Temperature Sensor No
Diaphragm Ceramic + Single Pore
Reference System Long-life
Electrolyte Polymer
Length 100 mm
Diameter 12–6 mm
Membrane Shape Spear
pH Range 0–14 pH
Temperature Range 0 to 80°C (32 to 176°F)
Connector BNC
Cable Length 1 m

Applications

  • Cheese pH testing
  • Butter acidity measurement
  • Dough fermentation monitoring
  • Soft fruit quality control
  • Semi-solid food product analysis
  • Dairy processing quality assurance

Frequently Asked Questions

What makes the LabSen® 251 suitable for semi-solid samples?
The spear-shaped glass membrane is geometrically optimized for penetration and contact with semi-solid matrices such as cheese, butter, and dough, ensuring reliable pH readings without sample damage.
Does this electrode require regular maintenance?
No. The polymer electrolyte design and cotton-filled reference system minimize contamination and eliminate the need for routine maintenance, reducing operational complexity.
What is the maximum operating temperature?
The LabSen® 251 can measure pH in samples up to 80°C (176°F), making it suitable for warm food processing applications.
What is the pH measurement range?
The electrode measures across a 0–14 pH range, covering acidic through alkaline conditions typical in food and dairy applications.
What connector type is used?
The electrode features a BNC connector for compatibility with most laboratory pH meters and data acquisition systems.