Ag-AgCl vs Metal Electrodes for Precision Measuring

Sintered silver/silver chloride electrodes are recognized worldwide as a stable, low noise reference electrode. It is reversible, which means it can pass an electric current without changing the chemical environment in the immediate vicinity of the electrode. This is not true of metal electrodes. This reversibility requires a soluble chloride containing electrolyte gel or paste such as EEG paste.

Because the sintered silver/silver chloride eeg electrodes are thermodynamically reversible, they exhibit low noise and theoretically zero electrode polarization impedance effects. They have much lower DC offset potentials than metal electrodes and provide excellent low frequency response.

 

Electrical Specifications:

Following are typical values of key parameters between pairs of electrodes of the same size measured after prolonged soaking in 0.9% saline.  

DC offset Voltage (biaspotential): 180 µV, Drift: 25 µV / h (at constant temperature) Noise: 1 µV P – P (0.1 – 1 (0.l – l kHz with 60 Hz filtered out) Polarization (counter EMF): 2 – 4µV at 0.1 µA

Essentially non-polarizable
Resuable-Resurfaceable,
Sintered
Never need chloriding

We test all of our electrodes for Continuity and DC Offset Voltage.