Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
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6.2 Calibration Method
The calibration is carried out as follows:
The counts supplied by the detector are read into memory at various product
densities or concentrations. At the same time the product temperature is auto-
matically stored. The density or concentration values (analysis values) deter-
mined in the lab are entered in another memory. The diagram below illustrates
the correlation of memories.
Countrates:
Rate:
Density/ Concentration
(Lab values):
Product temperature:
1: 3012 1.234 25
2: 2801 1.322 22
3: 2567 1.381 23
4: 2711 1.363 ...
... ...
... ...
10: 0 0 0
The calibration points should be distributed fairly evenly over the entire
measuring range.
Some calibration points may lie outside the measuring range
(e.g. water). However, calibration with
all
point lying outside the measuring
range is not advisable.
Calibration Modes
The calibration mode has to be entered in the Calibrate menu, submenu Calcu-
late. Five calibration modes are available.
a)
Calibrate mode 1
: one-point calibration
Select none and enter the absorption coefficient
This calibration mode must be selected when
•
only one value pair is available
or
•
only a provisional calibration is to be performed.
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