The DirectLine DL5000 Equilibrium Probe works on a patented equilibrium probe technology which is based on applying partial pressure of oxygen rather than the diffusion rate of oxygen through the probe membrane. This unique technology replaces oxygen consumed in the measuring process hence no replacement parts are required.
Oxygen is then allowed to diffuse through the heavy-duty probe membrane as a gas. The membrane eliminates the need for periodic replacements. Equipped with a permanent anode, cathode and reference electrode, the device is surrounded by permanent electrolyte and membrane, which reduces maintenance costs.