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Post by Mike Hernandez on Sept 1, 2021 19:20:41 GMT
Dialog Evolution version 9.12.
Hi guys.
I have a couple of these machines with air bubbles from the lower tray to the balancing chambers, dialysate lines .
I retrofitted the disinfection valve, calibrated degassing pressure in both machines average 6000hrs . the machine will passed the pressure test and sometimes even.
the temperature and conductivity test .
but 1 minute into disinfection mode . All you see is bubbles all over the clear tubing of the hydrualic,.
Thanks
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Post by SrCusEngr on Sept 5, 2021 20:09:14 GMT
Which lower tray? Below the UF shelf; DF shelf?
First: Observe. Exactly WHERE do you first start to see air bubbles?
FBK1? If yes, trace back further.
Input/Output of FPE? If yes, trace back further. If no, check your tubing. Input to DF manifold? If NO, you have air infiltration from your DF Manifold. Clamp the water inlet to the block (from the rear of the machine, the inlet is the tubing connector at the upper left corner). Next, break the tubing at FBK1. Take a 60cc syringe filled with water and connect it to your RVFPE/RVFPA test jig with a pressure gauge and then connect it to the tubing going back to FPE. Pressurize the block to about 1000mmHg and check for leaks. Look for water droplets around tubing connectors, temperature/conductivity sensors, etc. If you have EVO I, check FPE for leaky O-rings. Disconnect the tubing from the outlets of KP and BICP. If you see water dripping out of the tubing going to the block and pressure dropping, rebuild RVB and/or RVK. If need be, loosen the two screws holding the block to the shelf; move the block to release it from the shelf, and check for water droplets from a seam on the bottom of the block.
Input to DF manifold? If YES, then you have a problem with your Water Block/Degassing circuit. Air bubbles INTO the DF Manifold indicates that FPE has emptied the heated water side of the water block and there is no longer sufficient water to satisfy the pull of FPE. Possibilities: Float not registering LOW to allow VVBE to open. Orifice in VEB blocked. DBK not allowing water to flow from the heater outlet and into the water block. EP not pushing water through the heater and back into the water block. Kinked tubing.
Please post your findings.
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Post by Mike Hernandez on Sept 7, 2021 15:00:41 GMT
Hi, SrCusEngr
Thank you very much for the troubleshooting tips I received .
the lower tray I was referring to is the lower tray where the water tank is located.
I will keep you posted of the outcome, When I get back from the caribbean Islands and work on these machines.
I usually go there once a month.
Thanks you.
I really really appreciated.
Mike Hernandez
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Post by SrCusEngr on Sept 11, 2021 2:21:19 GMT
Okay, we can wait. One additional thing - there will be air bubbles in the lower shelf because it is a degassing (remove air from the water) circuit. However, there should be more water than air. So if you are seeing LOTS of air entering EP, there may not be sufficient water in the tank. Does the level sensor work properly in test 1.9 with VVBE closed and EMPTY enabled? Is PE proper for EP rpm? [1500 rpm, VEB open, PE < -35 mmHg; 2000 rpm, VEB closed, PE < -500 mmHg]
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Post by Mike Hernandez on Oct 15, 2021 17:19:37 GMT
going back to the air bubbles in the lower shelf of the machines , I noticed a cracked on the lower part of the water tank.
it was not leaking water from it .
I used a marine welding compound to seal the crack and solved the issue..
Thank You
MH
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Post by belvedere on Oct 15, 2021 19:01:29 GMT
I used a marine welding compound to seal the crack and solved the issue.. Kind of risky in my opinion. You just never know what chemicals from that epoxy could leach into the water. |
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Post by SrCusEngr on Oct 15, 2021 21:51:39 GMT
You stated that you had a couple of machines with air feeding the upper shelf. Do they all have cracked tanks? And is that epoxy FDA approved to be in contact with fluid that will touch a patient?
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