joey
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Post by joey on Jul 29, 2021 15:46:31 GMT
We have a machine where the arterial blood side pressure sticks.
When the pressure went high during an alarm it just stayed there and would not release.
I came in the room later it was still like that and I stripped it to pull it and when I took the transducer off it stayed like that but then I opened the front door to see what was going on with it the pressure sensor released. When I got it in back I tested the sensor and ran a couple primes to test it and it worked but I ran a simulated therapy and it stuck when going through self test when priming. I changed the board so it has a brand new sensor board and sensor and it went back out and it happened again out in the room. The cord does not have any corrosion and it has been re-seated a few times when trouble shooting and switching the board. When it stuck today the tech grabbed it on the front door to move it to pull it and it released when he did so. It seems that jostling the door releases it but I do not see how that could be.
Any input would be appreciated.
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Post by Chuck Weddle on Jul 29, 2021 16:53:30 GMT
We have a machine where the arterial blood side pressure sticks. It sounds like a classic wet internal transducer protector.When the pressure went high during an alarm it just stayed there and would not release. Did it go high positive or negative pressure?I came in the room later it was still like that and I stripped it to pull it and when I took the transducer off Does this mean you don't use Streamlines? it stayed like that but then I opened the front door to see what was going on with it the pressure sensor released. When I got it in back I tested the sensor and ran a couple primes to test it and it worked but I ran a simulated therapy and it stuck when going through self test when priming. I changed the board so it has a brand new sensor board and sensor and it went back out and it happened again out in the room. The cord does not have any corrosion and it has been re-seated a few times when trouble shooting and switching the board. I would try a new ribbon cable, it could have a broken wire. When it stuck today the tech grabbed it on the front door to move it to pull it and it released when he did so. It seems that jostling the door releases it but I do not see how that could be. Make sure your ground wires are secure.Any input would be appreciated. |
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joey
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Posts: 235
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Post by joey on Jul 29, 2021 18:18:52 GMT
We have a machine where the arterial blood side pressure sticks. It sounds like a classic wet internal transducer protector(I've only had a few wet internal transducers in my time here but wouldn't it not perform normally anymore? Once it was unstuck it worked perfect and verified with external meter).When the pressure went high during an alarm it just stayed there and would not release. Did it go high positive or negative pressure(negative)?I came in the room later it was still like that and I stripped it to pull it and when I took the transducer off Does this mean you don't use Streamlines(unfortunately not but we are trialing on October)? it stayed like that but then I opened the front door to see what was going on with it the pressure sensor released. When I got it in back I tested the sensor and ran a couple primes to test it and it worked but I ran a simulated therapy and it stuck when going through self test when priming. I changed the board so it has a brand new sensor board and sensor and it went back out and it happened again out in the room. The cord does not have any corrosion and it has been re-seated a few times when trouble shooting and switching the board. I would try a new ribbon cable, it could have a broken wire(it is not a ribbon cable it is a plug with loose wires and I checked the continuity on each one and it tested ok). When it stuck today the tech grabbed it on the front door to move it to pull it and it released when he did so. It seems that jostling the door releases it but I do not see how that could be. Make sure your ground wires are secure(all were secure).Any input would be appreciated. Thanks Chuck, I changed the internal transducer since I had them and tested it and will see what happens. |
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Post by SrCusEngr on Aug 1, 2021 6:48:50 GMT
First question: What version machine is this? I think you have Ver 8.30 but need to be sure what you are talking about as there are two different systems in play.
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joey
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Posts: 235
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Post by joey on Aug 9, 2021 14:00:11 GMT
First question: What version machine is this? I think you have Ver 8.30 but need to be sure what you are talking about as there are two different systems in play. you got it ...8.30 |
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Post by SrCusEngr on Aug 15, 2021 16:09:24 GMT
Well, it sounds like this machine has the 'sensors on a board' instead of the individually mounted sensors. And there is a plug at one end to carry all the signals back to the LLS board. It sounds like what you are seeing is a loss of signal. To be brief, even though you checked for continuity, if you lost the ground, the last value seen has no reference anymore. Also, since this machine probably has many hours on it, the chance of a bad wire in the wiring harness for the sensor wires is high. And, since the movement of the door can cause it to return to normal, I would concentrate my efforts on the wires where the door hinges are. That is a bend point which can fatigue the wires.
BTW: how high did the pressure go? You never cited it?
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joey
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Post by joey on Aug 16, 2021 13:57:38 GMT
ok great thank you!!
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joey
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Posts: 235
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Post by joey on Aug 16, 2021 18:11:42 GMT
Well, it sounds like this machine has the 'sensors on a board' instead of the individually mounted sensors. And there is a plug at one end to carry all the signals back to the LLS board. It sounds like what you are seeing is a loss of signal. To be brief, even though you checked for continuity, if you lost the ground, the last value seen has no reference anymore. Also, since this machine probably has many hours on it, the chance of a bad wire in the wiring harness for the sensor wires is high. And, since the movement of the door can cause it to return to normal, I would concentrate my efforts on the wires where the door hinges are. That is a bend point which can fatigue the wires. BTW: how high did the pressure go? You never cited it? I believe it was around -475 |
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Post by SrCusEngr on Aug 21, 2021 17:34:11 GMT
I do know that when PDA opens, the pressure goes to about -675. Since PA should be calibrated at -300/0/+300; that -475 value appears to be a loss of signal. I would concentrate on finding the trace from the PV sensor that carries the signal to the plug. One line is ground, one is 5 volts, and the last is the pressure signal. This should be somewhere between 0 to 5V. Since PA is a -, 0, + signal, 0 mmHg should be about 2.5vdc. Find that trace and which plug pin it goes to and you have found the wire responsible for taking that signal back to the LLS board.
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joey
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Posts: 235
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Post by joey on Aug 23, 2021 12:19:23 GMT
I do know that when PDA opens, the pressure goes to about -675. Since PA should be calibrated at -300/0/+300; that -475 value appears to be a loss of signal. I would concentrate on finding the trace from the PV sensor that carries the signal to the plug. One line is ground, one is 5 volts, and the last is the pressure signal. This should be somewhere between 0 to 5V. Since PA is a -, 0, + signal, 0 mmHg should be about 2.5vdc. Find that trace and which plug pin it goes to and you have found the wire responsible for taking that signal back to the LLS board. Ok great thanks! |
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