Density Meter LB 444 SECTION 5. GETTING STARTED
46
Calibration
One-point calibration is sufficient for preliminary adjustment of the measurement
ranges. Two- or multi-point calibrations should be performed for accurate and fi-
nal adjustment. Different procedures are required for each calibration method.
For more information on the calibration methods see section 6.2 Calibration
Method.
5.1.1.3 One-point Calibration
If only one value pair is available or the value pairs are close together, one-point
calibration has to be performed. Enter an absorption coefficient as a1-value; for
common products, this value may be taken from the table in the Appendix. The
calculation formulae for other products are listed in section 6.2 Calibration
Method.
Please read section 6.2 Calibration Method in any case before performing
calibration!
Prerequisite:
Pipeline or container must be filled completely
1. Select menu Calibrate / Live Display with <
more
>.
2. With <
sk1
>, call the Calibrate submenu.
3. Select product.
4. Specify if it is a suspension measurement.
5. Select unit.
6. With <
sk1
>, select the Data input submenu.
7. Deselect Calibr. Data transfer with "No"
8. Read in 1. Rate: cursor appears in the row "1. Rate = cps".
Press <
run
>. The countrate and the temperature (if a temperature sensor is
connected) are read in. Wait until the measured value has become stable
(20 to 50 s). While reading-in the countrate, the density of the products
must not change.
9. While reading in the countrate, take a sample of the product from the pipe-
line and determine its density or concentration.
If the product is very inhomogeneous, take several samples in quick suc-
cession and calculate an average value from their density or concentration
values.
10. Stop measurement by pressing the <
run
> button again.
11. Accept result with <
enter
>. Cursor jumps to next row.
12. Enter the density value of the sample(s) in g/cm³ determined in the lab and
confirm with <
enter
>. Cursor jumps to third row.
13. Confirm current product temperature with <
enter
>.
14. Rates 2. to 10. must all contain "0". If “0” is already there, scroll through the
rates with <
more
> until you get to the submenu group Data input / Calcu-
late. Otherwise, delete values with <
clear
> and confirm each with <
enter
>.
15. With <
sk2
>, select Calculate
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