anything to be aware of when replacing one of these bad boys, alarm code A11 thanks!

Yeah, even though the Fresenius Bulletin with all the Blood Pump alarm codes and what to replace first, says replace the Hall Rotor Sensor for A 11, most of the time we have found that the motor is the culprit. And we usually see A11 and/or A24 both intermittently. That happened to me as recently as last Friday. And be careful, the Hall Rotor sensor and the Door sensor have almost identical part numbers, but they are different. One of those sensors was on indefinite back order recently also. They are so small that you might not notice the difference if you do not look real closely. And any time you remove the motor assembly make sure that when you reinstall it that you do not catch the vent tube under the corner of the motor between it and the gasket or housing. That tubing is all one assembly with the interior transducer protector, and it is not the same part as the interior transducer protector on an H machine blood pump. Let me guess, your machine has somewhere between 5 and 10,000 hours on it, and it's only two or three years old? 4 or 5KOS serial number? We have replaced about 25% of our motors on those machines, around 40 or 50 out of 200 machines. And also, if you are doing the 6 Month PM program, you had to record the serial number and Engineering Codes of the blood pump module when you did the Qualification Sheet, so if you change the module, you should probably fill out another sheet. And that also means that you should not use an H machine module in the K, because there is no way that the H module will meet those engineering code requirements that are listed on that Qualification Sheet. And you can save some money on the motor assemblies by having H&S Technical Service rebuild your bad motors. Just do not attempt to do anything with the very fragile tach assembly that is attached to the end cap as you will probably ruin it and then they will not be able to rebuild the motor.

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I just finished repairing another K blood pump that had an A11 alarm. We had recently replaced the motor so I put the Rotor Hall Sensor in. It still had the A11, so I put another motor in it and that took care of the problem. Some things to add about the rotor sensor and the door sensor. They look very similar but they are not the same. Both have three wires, but the door sensor has a four pin plug on it, and the rotor sensor has a three pin plug. So you can install a rotor sensor by mistake in the door sensor position. And it will work on some of the functions but not all. I don't think you can install a door sensor in the rotor position because the four pin plug is too large and will not fit into the three pin socket on the LP 956 board. And, there is a top and bottom to both of those sensors. The rotor sensor has white lettering on one of its flat sides, and when you put it into the plastic holder that lettering should be showing. The door sensor does not have any lettering, but if you look real close at the very tiny @#$$%* sensor head you will see that the edges are beveled so that one flat surface is slightly smaller than the other. The smaller surface is the face of the sensor and it has to point away from the plastic housing and towards the door or rotor, or the front of the module. The rotor sensor is also like that and the lettering on it is on that smaller flat surface. When you put the three wires into the slot of either plastic housing the green wire should be to the out side of the slot, i.e. put the white wire in first and the green wire in last, and that should also give you the proper orientatation of the sensor face. Also if you replace the door sensor be careful if you have to turn the module over to dump out a lost screw. In the bottom of the hole for the door sensor there is a steel washer that can fall out. That washer is what the door magnet is attracted to, and without it the door will not stay closed and the sensor may not work either. The reason that washer is there is because the rest of module is non-magnetic pot metal or aluminum. The washer, called Door Magnet Ring,part number M30677, $4.36 each, looks like a 3/8 inch flat washer. If you install the door rotor upside down then the blood pump will only initialize up to the blood line size, example 8.0, and then stop, it will not show a speed rate because it thinks the door is still open. I can't tell you what happens if you install the rotor sensor backwards, but I'm guessing you get an A something alarm. Here are the part numbers for the sensors, Rotor Hall Sensor, 670709,$8.57,and the Door Hall Sensor,670710,$10.09. Also, once you remove those sensors from the anti-static envelope that they come in there is not a part number on them that I could see.

This message has been edited. Last edited by: Ktech,

Ktech,

Nice...I didn't know that H&S could repair the blood pumps. Thanks for the tip. I just had a few of mine go out (4 within a two month time span). 2 1/2 years 8000-9000 hours, 5kos-serial. I know they don't repair the silver housing Blood pumps (A&D type T24****). Or atleast they couldn't repair the ones I sent..

Excuse me...I ment blood pressure modules. H&S couldn't repair A&D type blood pressure modules.