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6 Explanations Volume 6
6.4 Multi-Point Calibration
Polygon Line In a multi-point calibration, the calibration points are connected
with each other by a straight line, i.e. a polygon line.
Figure 6-8 Multi point calibration
A multi-point calibration makes sense:
• if high accuracy is required over the entire measuring range,
• on irregular tank shapes such as conical or lying cylindrical ves-
sel
• if accessories, e.g. an agitator, are in the radiation path
As a rule, the vessel is filled in steps of 5 to 20 different levels. The
Uni-Probe LB 490 can be calibrated using the values measured in
this way.
If it is not possible to fill the different levels with the product, you
may also use one product which is equal in density. Often water is
used as replacement for the product. Please contact our field ser-
vice staff, or BERTHOLD TECHNOLOGIES directly, to get more infor-
mation on optimum calibration.
Try to record as many value pairs as possible, but use as few value
pairs as possible for calibration.
If you have measured several calibration points it is quite helpful to
draw the calibration curve. Using the curve it is easy to tell which
calibration points are not necessary, i.e. those that fall between
calibration points already in a flat line.
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