Fresenius Medical Care 2008K Operator's Manual page 69

Conductivity
The Theoretical Conductivity (TCD) represents the expected conductivity for the selected
concentrate at the set Na+ and bicarbonate levels. It is displayed above the electrolyte
constituents on the left side of the "Dialysate" screen (see Figure 28 on page 61). The actual
conductivity of the Final Dialysate is displayed above the conductivity bar graph on the right
side of the "Dialysate screen." It is represented by a horizontal bar in the conductivity graph.
The bar appears green when the conductivity is within alarm limits, and turns red when the
actual conductivity is outside the alarm window. With both concentrate supplies connected
to the machine, a stable, accurate conductivity reading should be attained about five minutes
after the concentrate is confirmed in the "Dialysate" screen.
Conductivity Limits
As the operator changes the sodium or bicarbonate settings, the TCD (Theoretical
Conductivity) will change. The alarm limits are set around the TCD. The alarm window is
the area between the upper and lower alarm limits. The upper and lower alarm limits are
shown by yellow horizontal lines in the conductivity bar graph. They are set 0.5 mS/cm
above and below the TCD by default. The conductivity alarm sounds when the actual
conductivity of the dialysate climbs or falls outside of this window. The alarm window can be
shifted up or down to within 0.5 mS/cm of the default setting using the Alarm Position
button (with the data entry keypad), and widened or narrowed using the Alarm Width button
(and the data entry keypad). The width of the alarm window can be set from a minimum of
0.6 mS/cm to a maximum of 1.0 mS/cm, within the range of 12.5–16.0 mS/cm.
The following examples illustrate how to set the conductivity alarm window:
Upper and lower alarm limits
Figure 32 – Changing Conductivity Limits
2008K Hemodialysis Machine Operator's Manual Rev P
Chapter 3—Setting Treatment Parameters
1) To access the
position of the
conductivity alarm
window, touch Alarm
Position.
2) To shift the
conductivity alarm
window upward, press
the  (Up) arrow key.
To shift the window
downward, press the 
(Down) arrow key.
3) Press CONFIRM to
save the new alarm
settings.
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