AAS offers Flat Surface pH and ORP Electrodes that are combination In-Line, pH+Reference (or ORP+Reference) electrodes with a double reference junction for added protection against contamination.

All pH and REDOX (ORP) electrodes that AAS supplies are easy maintenance, combination electrodes with quick disconnect BNC connectors. Electrode installation and removal can be done in just a few seconds and no tools are needed. Built into the electrode's body is a sealed, gel filled double junction reference half cell. This design provides an extra barrier against reference side contamination.

In the center of the measuring surface is the pH-responsive (or ORP-responsive) flat glass surface. This surface is surrounded by the flat porous reference junction. The large area of this porous junction has thousands of pores that provide excellent sample contact.

The flat sensing surface is rugged, abrasion resistant, and self-cleaning. In both coating and abrasive applications these flat-type electrodes can improve measurement accuracy, reduce maintenance, prolong electrode life and virtually eliminate breakage.

SELF-CLEANING OPERATION

This simple, but effective system has no moving parts and requires no power. When the electrode's flat measuring surface is exposed to turbulent flow, the resulting scrubbing action provides a self-cleaning effect in most applications. For the typical spherical electrode (like other less expensive suppliers use), the downstream side is shielded from the flow; coating forms on this dead flow area, causing sluggish and drifting signals.

ABRASION-FREE OPERATION

Particles sweep by the electrode's flat, non-protruding surface without impinging on or abrading it-extending electrode life. Also, the electrode's non-protruding design virtually elinimates electrode breakage. Particles impinge on the upstream side of the spherical electrode, causing abrasion, calibration shift, and short life.

VISCOUS MATERIAL OPERATION

Viscous materials flow by the electrode's flat measuring surface in shear. Flow in shear causes new material to uniformily displace the old material. Having fresh material at the electrode's surface is essential for measurement accuracy. Downstream side of a spherical electrode is shielded from the flow; old sample is not displaced--giving inaccurate readings.

It should be clear to see why the AAS pH and ORP measurement systems are superior to other suppliers less expensive solutions.