ROSS Premium pH Electrodes

Faster Response


If you are measuring samples that vary in temperature, or differ in temperature from your calibrating buffers, the special internal system of ROSS electrodes provides superior measurement stability, faster response, greater accuracy and more reproducible results than conventional electrodes. With ROSS electrodes you avoid long-term drift or inaccurate readings, even in samples that vary in temperature, while conventional electrodes produce unstable results until they reach thermal equilibrium with the sample.


Temperature Response


The typical results in the graph below show how ROSS electrodes respond versus the best of conventional pH electrodes. In this case, both

electrodes were taken from a pH 4.01 buffer solution at 25 ?C and placed in the same buffer at 75 ?C. The ROSS electrode almost immediately reported the correct value of the buffer, pH 4.13, at the new temperature. After three minutes, the conventional electrode had just started to move toward the 4.13 mark. When both electrodes were put back in the 25 ?C buffer, the ROSS electrode read 4.0 again in less than 30 seconds while the other electrode was considerably in error. The ROSS electrode continues to show fast reproducibility and accuracy after many, many dramatic temperature changes.


No Sample Contamination


Conventional electrodes can leach metal ions into the filling solution and subsequently into the sample. ROSS electrodes do not contain silver or mercury that can react with the sample or clog the junction. Use ROSS pH electrodes where trace amounts of metal ions cannot be tolerated, in such samples as biological media, foodstuffs, and pharmaceuticals. All ROSS pH electrodes can be used in samples

that contain TRIS, sulfides or proteins.


Double Junction Design


This construction allows you more control over an important variable. Use a filling solution that is similar to the sample in order to minimize junction potential problems in high or low pH samples or non-aqueous solutions.  Also change the filling solution to minimize contamination when potassium or chloride in the sample is undesirable.


Sure-Flow Junction


The unique, free-flowing liquid-toliquid junction assures you of the most stable, drift-free measurements. The easy-to-clean junction never clogs, simply press the cap and flush the junction area. Release the cap and the junction is reset. Now even the most problematic, dirty or viscous samples can be easily measured without a clogged junction!


Best for Routine pH


Use ROSS electrodes as your standard for all routine pH determinations. They will provide accurate, stable, fast, and reproducible results.


Specifications Common to all ROSS Electrodes

  • Slope: 92-102% of theoretical Nernst slope
  • Isopotential point: pH 7
  • Accuracy of measuring a pH 6.86 buffer after standardization at 25 °C:

Accurate within 0.03 pH for buffer at any temperature between 0-100 using automatic temperature compensation.

  • Speed of response in 6.86 buffer going from 25 °C to 75 °C: Response stable

0-101to 0.01 pH within 30 seconds

  • Speed of response between 6.86 and 4.01 buffers at 25 °C: Response

stable to 0.002 pH within 15 seconds



Cat. No. Recommended Accessories

810001 ROSS Storage Solution

810007 ROSS Fill Solution

910199 All-in-One pH Buffer Kit

Ankersmid Lab,  (31)-0548-59 59 79