HCEN12630 Revision 07.2015
Program version 1.xx
AK 98™ Dialysis Machine - Calibrations 157
Figure 7-4. Pressure transducer.
1. No pressure
2. -500 mmHg
3. +500 mmHg
4. E
2
PROM
NOTE!
Never try to fit another transducer board to a transducer since there is an analog
trimming made with a resistor (laser trimmed) during manufacturing.
7.1.7 Calibration errors
Calibration error Reason for the error
Set value and measured value are too
separated
If a value, far away from the reading on the
reference instrument is entered. Typically,
entering a positive pressure, when the actual
pressure is negative.
Set value is too near values entered earlier The calibration achieves highest accuracy, if
the measuring points are far apart.
A three-point calibration with zero, -15mm Hg
and +18 mmHg will generate a poor result.
Table 7-1. If the machine finds that one of the calculations generated an offset or a
coefficient which is outside its limits, it will generate a calibration error. There are
several possibilities:
7.1.8 Calibration errors - Pressure transducers
If the AK 98 dialysis machine finds, during the pressure transducer calibration
procedure, that a calculated offset or calibration coefficient is outside certain limits, a
calibration error appears. These limits are:
● Offset: ±20 mmHg
● Calibration Coefficient: 0.9 – 1.1
● Correlation Coefficient: Low limit 0.95
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