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Post by lisagalvan on May 30, 2022 16:38:49 GMT
I have a machine that keeps coming back failing OLPT!You name it I have checked or replaced everything I can think of!I do a positive and negative pressure test each time and do not find leaks or bubbles.This started 3 months back and has came back multiple times...new parts dear motor,air seperator,dear pump,flow pump head,valve 24,replaced diasafe,changed and cal #9 transducer due to it failing TMP and opt detector.Sooo...still fails OLPHT.Any help,please!
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Post by gfreely on May 30, 2022 16:59:00 GMT
You could try a UF Pump Integrity Test and/or change the UF filters...just a thought.
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BMF
Junior Member
Posts: 86
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Post by BMF on May 30, 2022 17:30:59 GMT
Look at debug screen 1 (PHT 0 and PHT1). Is there a value listed in either of those boxes when it tests or do they say 0? If those boxes are both 0 each time you perform the test, set the dialysate flow to 800 and look at FLWP on debug screen 0. Let the conductivity stabilize first for about 10 minutes. If FLWP is higher than 165, adjust the nut on the flow pump head counterclockwise in very small increments until it is set to 160. Retest and it should pass.
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Post by lisagalvan on Jun 13, 2022 17:02:45 GMT
No...my FLWP is 154.Sometimes there are numbers between 0-10 in the boxes.
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bess
Junior Member
Posts: 59
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Post by bess on Jun 13, 2022 18:46:14 GMT
Do a 3 minute manual pressure holding test with TMP set to 460mmHg and flow rate turned OFF. If that fails then start chasing small leaks--pinhole leak in balancing chamber membranes, balancing chamber valves with solenoids that aren't fully closing, o-rings that could be letting air into the system
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stuff
Full Member
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Posts: 229
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Post by stuff on Jun 13, 2022 19:01:57 GMT
isnt the range for FLWP at an 800 flow 155-165 though? so 154 is out of that range
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Post by Guest123 on Jun 13, 2022 20:47:00 GMT
isnt the range for FLWP at an 800 flow 155-165 though? so 154 is out of that range Yes and no. 155-165 is the range but even as low in the 130's, I still get/have machines that pass. Anything below the 150's & unable to adjust then it's time to start thinking about replacing the pumphead. *Have you swapped the d & f pumpheads and ran a PHT test yet? If you haven't try that and see if you get a pass or fail. I would also do the UF pump integrity test or swap with a known good one as suggested above. |
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Post by gnurk on Jun 14, 2022 12:08:24 GMT
the numbers for pht1 and 2 should be between 0 and 20
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Post by lisagalvan on Jul 5, 2022 14:37:31 GMT
Sorry for the communication delay...been on PTO.Now this ma hine was failing OLPHT AND OLCs #4.After replacing a kinds of stuff along with new dear/flow motors and pump heads,I was just watching the machine..thinking about tossing it in the dumpster..when I saw the NEW flow pump stopping intermittently.Swapped it out and took care of both issues.Thank everyone.
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Post by gnurk on Jul 6, 2022 12:50:06 GMT
thanks for posting your fix
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mtw2
New Member
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Post by mtw2 on Jan 18, 2023 16:00:40 GMT
I must be getting old. I kept pressing 0 instead of 1 for pht. Anyways I have a bluestar, 14k hours, deaer and flow brushes rebuilt, but my dac @800 reaches only 154 at best. I installed a new flow pump(2019) but even when nut is fully clockwise, I can only achieve a dac of 150-152. Could my pump be not the new tephlon kind? And how can I tell?
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stuff
Full Member
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Post by stuff on Jan 20, 2023 12:12:21 GMT
The flow/degas motors have multiple parts. It has the motor side with brushes coils and magnet sleeve. Then there is what I call the wet end end, where you get your pressures from.
If you just changed out the motor side, your wet end could be the problem
If you just changed out the wet end the motor could be the problem
Also from your comment it looks like your combining 2 things that as far as i know dont mix.
DAC value is the number when you go into the calibration
FLWP is a number that fluctuates depending on dialysate flow.
So i am not sure if you mean the actual DAC value or the FLWP value when you say DAC is at 154 with 800 flow.
I would also suggest check your flow/degas pressures and get those square BEFORE adjusting that nut
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mtw2
New Member
Posts: 47
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Post by mtw2 on Jan 20, 2023 13:38:57 GMT
No, I understand. I picked up bad habits from others referring to the flwp as a dac value. So I replaced flow motor brushes, the motor seems stong. I replaced the flow pump with a never used pump(2019) and reads 36psi in cal mode. When the machine is running at 800 flow for a good 5-10 minutes, the flwp is now 150 at best, which is why I tried adjusting the nut. Normally my machines were known to have a higher flwp of 170s and had to be adjusted down. This one is different and Im trying to figure out why. Pressure holds steady for 3 minutes with flow off.
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