Biotech-Lab User Manual
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Use the adjustment functions only if you are fully aware of their consequences. Wrong adjustment values
will lead to false measurement values and in consequence these false values lead to hazards for patients.
12.1 ADJUSTMENT
An adjustment is a process in which properties of a measuring device are changed in that way that its scale or
display reads the same as an reference device or standard.
12.2 CALIBRATION
Calibration is the process of establishing the relationship between a measuring device and the units of measure.
This is done by comparing a device or the output of an instrument to a standard having known measurement
characteristics. For example the length of a stick can be calibrated by comparing it to a standard that has a known
length. Once the relationship of the stick to the standard is known the stick can be used to measure the length of
other things. Adjustments are checked by performing a calibration.
12.3 GENERAL
According to ISO 10012-1 “General Quality Assurance Requirements for Measuring Equipment” the error
attributable to calibration should be as small as possible. In most areas of measurement, it should be not more than
one third and preferably one tenth of the permissible error of the confirmed equipment when in use. In other words
the accuracy of the references to adjust or calibrate the HDM must have at least a tree times higher accuracy.
After a channel has been adjusted it is necessary to calibrate it afterwards. If inconclusive or incomprehensible
values are shown in the display it is highly recommended to do a calibration.
The procedure of calibration and adjustment is slightly different for each channel. Proceed with an adjustment only if
you have fully understood the procedure.
• Conductivity is adjusted only at one sampling point. No further points are needed due to the high linearity of the
conductivity probe.
• The temperature sensor does not drift. Normally there is no adjustment necessary. The adjustment is done by using
two sampling points.
• The pressure transducers drift is linear within its tolerances, so there is a tare function (see chapter “Measuring”).
Normally there is no adjustment necessary. The adjustment is done by using seven sampling points.
• Due to the kind of their technology it is necessary to adjust pH probes periodically. This is done using two sampling
points.
If you are uncertain of entering the correct adjustment values you can discard the values and cancel the adjustment
procedure at any time.
12 Adjustment and Calibration
