Fresenius Medical Care 2008k Technical Manual page 125

CHECK DIALYSATE PRESSURE.
Line 5
1. With the machine in dialysis mode and at the Home screen, open the shunt door
and remove the dialysate lines.
2. Connect the dialysate lines to a four-way connector and hang it at normal dialyzer
height.
3. Connect a 30cc syringe to one of the four-way connector outlets.
4. Connect an external pressure gauge to the remaining four-way connector outlet.
5. Clamp the tubing between the external pressure gauge and the four-way connector.
6. Close the shunt door.
7. Dialysate should be flowing, as indicated by the flow indicator in the dialysate
lines. Wait until no air is visible passing through the flow indicator then press the
[Dialysate Flow on/off] key to stop the flow.
8. Unclamp the tubing between the external pressure gauge and the four-way
connector.
9. Use the syringe to create a pressure reading of 0mmHg on the external pressure
gauge. Verify that the TMP value on the Home screen is 0mmHg.
10. Use the syringe to create a pressure reading of -250mmHg on the external pressure
gauge. While holding this pressure, verify that the TMP value on the Home screen
is 250mmHg ± 10mmHg.
NOTE: Calibration must be performed if the TMP values are not within tolerance.
11. Return the dialysate lines to the shunt.
12. Turn the dialysate flow back on by pressing the [Dialysate Flow on/off] key.
CALIBRATE LEVEL DETECTOR WITH UNIT'S BLOOD LINES
Line 6
1. Place the machine in Dialysis mode and clear all blood alarms.
2. Insert a venous chamber filled with warm water into the level detector. For
accurate calibration, use a venous chamber identical to that normally used in the
machine.
3. Move the jumper on the LP241 board to the Calibrate position.
4. Observe the Channel 1 LED. If the LED is ON, turn potentiometer 144 on the
LP241 board clockwise until the LED turns OFF.
5. Slowly turn potentiometer 144 counter-clockwise until the channel 1 LED switches
ON. Stop turning immediately, just past the point where the LED lights.
6. Repeat Steps 5 and 6 for the Channel 2 LED, adjusting potentiometer 145. The
response of channel 2 is slower than channel 1. When adjusting to the switch point,
move the potentiometer in small steps and wait to see if the LED switches ON.
7. Move the jumper on the LP241 board back to the Normal position.
8. Press the [RESET] key to clear the alarm and check that both LED's are OFF,
indicating that the level detector is sensing no air present in the venous chamber.
9. Remove the venous chamber and watch the LED's. Verify that channel 1 lights first
followed quickly by channel 2.
NOTE: Channel 1 stops the blood pump and Channel 2 clamps the venous blood line.
P/N 507300 Rev. A
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