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pH / ORP Conductivity Dissolved Oxygen Chlorine Standards CONTROLS Concerns in pH # 3: Sand Blasting Due to Slurry www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards PROBLEM In a pH electrode they are two key elements: the glass and the reference. To be able to measure accurately the glass surface must remain in good condition free from coating or pitting. When there is pitting the sensor loses slope and becomes sluggish because the Hydrogen Ions cannot leach onto a rough surface as efficiently. In the process the sensor will show inaccurate results. And subsequently, during calibration the slope will deteriorate until the sensor must be replaced. www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards CAUSE In mining application there is normally a lot of grit which is travelling at a high velocity. When this grit hits the glass sensing electrode it has a “sand blasting” effect causing the glass to become pitted. This decreases the response of the electrode and wears the glass away. www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Protecting the Glass 75° to Flow www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Turning Flutes 75° to Flow To help keep the glass intact the probe should be turned 75° to the flow. By inserting the probe at the angle a vortex will be created around the glass. The vortex will increase the velocity of the process around the glass and reference separating the grit by centrifugal force, which will also quicken the electrode response time and keep the reference cleaner by using the abrasive nature of the slurry. By turning the flutes to 75° the process does not directly hit the glass. Keeping the glass out of the path of the slurry which will lengthen life. www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Angling the Flutes Insert the electrode with the flutes at 75° to flow, as seen in the diagram on the next slide. By inserting the probe at this angle a vortex will be created around the glass. The vortex will increase the velocity of the process around the glass and reference which will, in turn, hasten electrode response time and also keep the reference cleaner. As well, by turning the flutes to 75° the process does not directly hit the glass which will slow down the pitting action. www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Vortex Action www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Vortex Action www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS pH / ORP Conductivity Dissolved Oxygen Chlorine Standards Angling the Flutes Reduced Pitting Longer Sensor Life Less Maintenance Better pH Response Proven Technology Superior Design Better Results www.iccontrols.com IC Controls Quality Water Solutions for pH R1.0 © 2004 IC CONTROLS