Final Conductivity Limit (SUP)

Chuck is correct - I'd also be weary of the temperatures. Also if you could provide the age, operating hours, sw version we could probably help a bit more.

Please list at the time of the alarm
FPE
FPA
TSE
TSBIC
TSD
TSDS
TSDE
TSDE_S (if present)
KP
KP_S

Thanks everyone! The machine is an only a little over a year old and has only been in use about 6 months. I noticed the acid wand was sucking air so I replaced the line (it had the long pink tubing for central delivery systems) and replaced the o-ring and the small piece of tubing that connects the stick part of the wand to the wand holder. I still see air bubbles being sucked in often so I had originally thought I needed to just replace the whole thing. But then when I saw it was spiking instead of dropping then I got confused. Can you explain to me why the conductivity would be spiking instead of dropping if the acid wand is sucking air?

I did notice too though that right before the conductivity spiked up to around 15, the conductivity would start slowly dropping down to around 13.3 and then it would alarm and spike at the same time. So is it actually spiking because it is going into bypass?

I would like to add my two cents here because many people do not think about the workings of the DF Manifold. When looking at it from the rear door, in the upper left corner is the water inlet. On the other side (front) is the connector for the bicarbonate fluid. That fluid enters the bottom of RVB and then flows into an internal flow path, which then makes a downward direction to mid-height, and then goes horizontally to the bottom of the Bic conductivity cell. The fluid then goes thru the cell and re-enters the manifold and goes right to be mixed with acid coming from RVK. The path then goes to the bottom of the block (important!!), and then goes horizontally to the inlet of the End conductivity cell. It then flows thru the cell and back into the manifold near the top, and then flows to the port for FPE.

Now, we all know air bubbles float in water. Those two downward tubes can capture air bubbles if the flow is not sufficient to push them thru the entire length. Hence, the vertical tube just before the End condo cell can collect an enormous amount of air before the fluid has no choice but to push the air bubble out of its way. The air bubble flows thru the End condo cell causing a complete loss of conductivity (but you won't see this on the screen as zero because of 'averaging values over 1 minute'; only a trend will capture it). This loss causes the pump to suddenly ramp up but then the fluid hits the cell, and the pump returns to normal.

When I experienced this, the air infiltration was small enough to cause the alarm to occur every 13-15 minutes. From there, it was just a matter of finding the source of the air.

I hope this helps, because not many people think about the inner piping of the Manifold and how it can screw up your thinking when trying to solve a problem. Note: The PM has a procedure to pressurize the DF Manifold and then check for leaks. Good start.