Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
64
Two and Multi-Point Calibration
The gradient of the calibration curve can be determined accurately by two-point
calibration. Multi-point calibration helps to exclude errors made during sampling
and analysis. Furthermore, the output signal is in linear proportion to the con-
centration, even though the density is not linear to the concentration. For multi-
point calibration, enter the countrate obtained at various density values in the
submenu Data input at Rate 1. to Rate 10 and the density or concentration value
in the corresponding rows. The procedure is the same as with the one-point
calibration (see 0 Calibration).
For multi-point calibration, the respective values should be entered in the Prod-
uct Data menu at the queries Current Output Limit Values (see also page 19).
Current output 26a/26c.
0,9 1 1,1 1,2 1,3 1,4
6.000
7.000
8.000
9.000
10.000
11.000
Density in g/ccm
cps
Figure 28: Example of multi-point calibration
You need not observe a rising or falling order when entering the sample values.
However, you must observe the proper correlation countrate and density value.
The values must be available in pairs. If the associated density or concen-
tration value is missing, the countrate is automatically given the density or
concentration “0”.
Remedy
:
The entered data can be corrected as needed since the calibration procedure is
performed only after selection of the calibration mode.
To Next Page
Loading...
