Hi, folks, I have a 12 year old H machine with 36000 hours on it. It is very slow to come up into conductivity, and when it finally does it will not pass test because the conductivity drops low during the test. If you turn it off and let it come back up it will stabilize again at normal 14.0ms, go into test and drop out again. Tried an actuator board, no help, checked the cond. cal, temperature, deair and flow relief pressures. Tried a valve leak test and it passed. It does not have a fill program problem. The motors never stall out when this happens. Deair and flow relief pressures are good. Any thoughts, besides buy a new K machine while you still can?!!!

I had an old "H" that did the same thing. Try a Balance chamber volume cal. An acid pump volume and bicarb volume and finally a conductivity cal. Hope this helps

i've had this be the bc membranes. that is a true sign that they are bad.

I had this happen last week. It was a tear in the BC membrane.

I would still try the dearation pump head even if it checks out okay.

Try re building your acid and bicarbonate pumps

pato

What company do you work for? I do believe that most companies will replace machines at 36,000 hours because they have depreciated down to $0.00. It is easier than working on old, broken down equipment.

its the acid pump . Replace it

NO DOUBT THE BALANCE CHAMBER MEMBRANESTry placing the mach in service/ calibrate bcv and do a collect of the blue hansen connecter with the red in a bucket of water,then do a collect at drain if either are to the high side you will have a torn balance chamber membrane.

A follow up on this, there was a badly torn balancing chamber membrane, also a problem with valve 35. For those who sent replies, Thanks for the helpful input.

Like to thank the posters and site for helping me find this problem. This is the first membrane I have had to replace and will remeber what to look for next time! Thanks again!!

If you ever suspect a torn bc membrane, here is the fastest way to check it that I have learned. Bring the machine into conductivity and put both dialysate lines into a bucket of acid. If you have a tear in the membrane, the conductivity will spike (+17mS)in about 30 seconds. This is because acid is leaking from the spent side into the fresh side through the tear. Hope this helps.

quote:

Originally posted by FrankMills:
If you ever suspect a torn bc membrane, here is the fastest way to check it that I have learned. Bring the machine into conductivity and put both dialysate lines into a bucket of acid. If you have a tear in the membrane, the conductivity will spike (+17mS)in about 30 seconds. This is because acid is leaking from the spent side into the fresh side through the tear. Hope this helps.

Thanks!!

Frank, Most of the time you cannot get the conductivity to climb past 11.7 to 12.5 when you have a tear in the B.C membranes. So how does you test work??..If you cannot get flow to the hansens.The machine is in bypass.

quote:

Originally posted by Down south tech:
Frank, Most of the time you cannot get the conductivity to climb past 11.7 to 12.5 when you have a tear in the B.C membranes. So how does you test work??..If you cannot get flow to the hansens.The machine is in bypass.

I've found that most of the time the condo will be low (like 13.2) but not so low the machine is in bypass. That's why I suspect a b.c. tear in the first place. Low condo that a cell calibration doesn't fix or a condo that fluctuates with flow rate.

I guess you could also do this test in the condo cell calibration screen if the machine was in constant bypass.