Fresenius Medical Care 2008K Calibration Manual page 54

Wait five minutes after the last adjustment of the TEMP DAC value, then
verify that the temperature on the external meter has remained at 37°C. If
not, change the TEMP DAC value, and wait five minutes again.
11. When the temperature remains at 37°C, press the [CONFIRM] key. The
screen will change.
12. Select the Monitor Reference data button.
Adjust the value shown for Monitor Reference until it matches the
external temperature meter at 37°C and then press the [CONFIRM] key.
13. Press the [CONFIRM] key again to save the data. The screen will change.
Open the shunt to stop the dialysate flow, remove the lines from the
external meter and replace them on the shunt.
Press the [CONFIRM] key to complete the calibration and return to the
Calibrate Sensors screen.
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Fresenius 2008 K Calibration Procedures
P/N 507296 Rev D