Page 71
Fresenius 2008
®
K Calibration Procedures
P/N 507296 Rev D
3.2 LEVEL DETECTOR CALIBRATION
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.
Warning! For accurate calibration, use a venous chamber identical to that
normally used in the machine.
3. Move the jumper on the LP241/LP450 board to the Calibrate position
(see Figure 8).
4. Observe the Channel 1 LED (see Figure 8). If the LED is On, turn channel
1 potentiometer (see Figure 8) clockwise until the LED turns off.
5. Slowly turn channel 1 potentiometer counter-clockwise until the channel 1
LED switches on. Stop turning immediately, just past the point where the
LED lights.
6. Repeat Steps 4 and 5 for the Channel 2 LED, adjusting channel 2
potentiometer (see Figure 8). 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 back to the Normal position (see Figure 8).
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.
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