Currently have two 2008H's at 2 different facilities where the conductivity is "good" when the acid and bicarb source is the central delivery system (out the wall); however; when using "jugged acid", the values decrease by approx .2 or .3. It only happens on these two machines. Any suggestions? Thanks

There should be a check valve before the acid and bicarb pumps. I have had the same problem with some our our machines and found that if I take out tjese check valves the mS comes right back up to the TCD value.

That said if you take out the check valves to use jugs you need to replace them when you start using the delivery system again or you will start getting "high" conductivity readings.

Good Luck Matt

Also, if you have pressure regulators on the wall stations be sure nobody changed them. Some people think the more pressure the better when there should be as little as possible. Could also be springs and seals getting worn in the pump. Or like Matt said, the checkvalves. Good luck! Those kinda problems can be fun to hunt down. Lol.

quote:

Originally posted by NewestGuy:
Currently have two 2008H's at 2 different facilities where the conductivity is "good" when the acid and bicarb source is the central delivery system (out the wall); however; when using "jugged acid", the values decrease by approx .2 or .3. It only happens on these two machines. Any suggestions? Thanks

Found that diaphrams inside of the balance chamber were bad. Replaced the pair and recalibrated bc. Runs to spec. Thanx Fresenius!!!!