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Thermo Scientific™ Orion™ ROSS Ultra™ Refillable pH/ATC Triode™ Combination Electrodes for Orion Series Meters Available on GSA/VA Contract for Federal Government customers only.

Measure biological media, pharmaceuticals, foods and more with Thermo Scientific™ Orion™ ROSS Ultra™ Refillable pH/ATC Triode™ Combination Electrodes.

Manufacturer:  Thermo Scientific™ 8157BNUMD

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Catalog No. 13-643-201

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Measure biological media, pharmaceuticals, foods and more with Thermo Scientific™ Orion™ ROSS Ultra™ Refillable pH/ATC Triode™ Combination Electrodes. They are ideal for any application where the use of metallic reference electrodes would contaminate the samples. ROSS Ultra pH/ATC electrodes offer more flexibility, accuracy and precision for your pH measurement needs. With built-in temperature sensors, these electrodes offer a convenient solution for your routine sample measurements. They have great stability and drift and come with a two-year replacement warranty.

Unique internal element system replaces Ag/AgCl or Hg2Cl2 internals with platinum wire and redox-couple filling solution. Double-junction reference cells have porous ceramic or glass fiber outer junction. Design provides stable potential, independent of temperature, and stable readings even when samples vary by 50°C (90°F) or more. Minimizes drift, stirring effects, clogged junctions; no need for frequent standardization so samples are analyzed faster.

  • Epoxy body for durability and ruggedness
  • Built-in ATC probe
  • General-purpose applications
  • Standard size and standard bulb
  • Glass fiber junction
  • L x Dia.: 120 x 12mm


  • 0 to 14pH
  • 0° to 100°C (32° to 212°F) range
  • Slope, 92 to 102%; isopotential point, pH 7
  • When standardized in 6.86pH buffer at 25°C (77°F), accuracy is ±0.03pH for the buffer from 0° to 100°C (32° to 212°F) (using ATC); response is stable to 0.01pH within 30 seconds at 25°C (77°F) and 75°C (167°F) and stable to ±0.002pH within 15 seconds when cycling between pH 6.86 and 4.01 buffers at 25°C (77°F)
  • Max. cap dia. (top): 0.75in. (19mm); collar dia. 0.62in. (16mm); Cable length is 39.37in. (1m)
Description & Specifications


Orion ROSS Ultra Refillable pH/ATC Triode Combination Electrodes with a BNC and 8-pin MiniDIN Connector and 1 meter cable
2 years
0° to 100°C
Glass fiber
ROSS electrode 3 M KCl fill solution (Cat. No. 810007)
BNC Waterproof, 8-pin MiniDIN
Orion Versa Star, Star A and Dual Star Meters
0 to 14
0.03pH for buffers using automatic temperature compensation
Rugged epoxy body
Thermo Scientific Orion Versa Star, Star A, and Dual Star meters
pH/ATC Combination Electrode
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