Specialized Tools for Electrophysiology and Cell Biology Research

Protein Resistant pH Electrodes

Product Summary

These pH electrodes are ideal for biological samples containing proteins.

  • Ideal for determining pH in samples that contain protein
  • Faster response times than traditional pH electrodes
  • More accurate than traditional pH electrodes
  • Longer electrode life and more economical
  • Five styles available to meet most application needs
  • Operational pH range from 2 to 11

Measuring the pH of biological samples containing proteins is difficult. Proteins in solution can combine with silver ions from the electrolyte to clog the pH electrode diaphragm. This leads to long response times, inaccurate pH measurements, and eventually discarded electrodes. These protein resistant electrodes are designed for rapid, accurate, and reproducible pH measurements of protein containing solutions.

Unique to these pH electrodes is the specially formulated ProtelyteTM reference electrolyte. ProtelyteTM electrolyte prevents the precipitation of proteins on the electrode diaphragm. You get faster, more accurate, reproducible pH measurements of your samples. Select from five specialized electrodes. The best electrode for you depends upon your applications, physical size limitations, and temperature range. Each has a pH range of 2 to 11.


MinitrodeTM P The small size of this sensor makes it ideal for pH measurement of sample in microplates and microcentrifuge tubes. The sensor tip is 3 mm diameter with a usable length of 100 mm (3.9 inches).




FoodtrodeTM This sensor is ideal for measuring the pH of samples stored in cold rooms. Select this sensor if your sample is between -10° to +100°C. It has a 12 mm diameter tip.




FlushtrodeTMP If your sample contains between 5 to 85% water, this is the ideal sensor for you. It is good for determining pH of buffer solutions. It has a 12 mm diameter tip.




TiptrodeTM This pH sensor was designed for pH measurements in applications requiring penetration of solid and semi-solid materials including: foods, gelatinous materials, and viscous buffers. It has a 6 mm tip.




These pH Electrodes are supplied individually and have A7 type connectors. To ensure the most accurate pH measurements, calibrate your electrodes with DURACAL®Buffer Solutions.


Order No. Electrode Length Diameter Temp. Range
69-0070 MinitrodeTMP 100 mm 3 mm 0° to 80°C
69-0072 FoodtrodeTM 100 mm 12 mm -10° to 100°C
69-3160 FlushtrodeTMP 120 mm 12 mm 10° to 50°C
69-0074 TiptrodeTM 25 mm 6 mm 0° to 80°C

Customers from Europe and Australia can use the Multi Channel Systems - Online Shop to order Warner products or create quotes.

Order No. Model No. Product Description USA Price Order
Protein Resistant pH Electrodes
69-0070 Minitrode, length 60 mm, diameter 3 mm Login Login
69-0072 Foodtrode, length 100 mm, diameter 12 mm Login Login
69-3160 Flushtrode, length 120 mm, diameter 12 mm Login Login
69-0074 Tiptrode, length 25 mm, diameter 6 mm Login Login
69-0075 Protelyte reference electrolyte solution, 100 ml Login Login
69-0076 Electrode storage solution, 500 ml Login Login
69-0077 Electrode connecting cable, BNC to AS7, 1 m (3.3 ft) Login Login
69-0078 Electrode connecting cable, DIN to AS7, 1 m (3.3 ft) Login Login
69-0079 Electrode connecting cable, Metrohm (Lemo) to AS7, Type F, 1 m (3.3 ft) Login Login
69-0080 Electrode connecting cable, Metrohm (Lemo) to AS7, Type H, 1 m (3.3 ft) Login Login
69-0081 Electrode connecting cable, Radiometer to AS7, 1 m (3.3 ft) Login Login
69-0082 Electrode connecting cable, Standard US to AS7, 1 m (3.3 ft) Login Login

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