Berthold LB 444 - Two- and Multi-Point Calibration

Density Meter LB 444 SECTION 5. GETTING STARTED
47
16. Select calibration mode "none" = one-point calibration
17. Calculate absorption coefficient and enter it in Results a1.
Calibration starts as soon as you confirm
<
enter
>.
18. Zero countrate I0 is displayed. Continue with <
more
>.
19. The entered linear absorption coefficient for this application is displayed. It
must not change during one-point calibration. If it has changed, at least one
more value pair is available.
Correction:
Delete the additional value pair.
Run through steps 15 – 17 once more.
20. Skip the other coefficients with <
more
>.
21. If necessary, enter a factor for multiplicative correction of the measured
values to correct the gradient of the linear line. This becomes evident only
during measurement and is only required when the absorption coefficient is
too small or too big (see section 6.6 Correcting the Results: Addition and
Multiplication).
22. If necessary, enter an Offset for additive correction of the measured values
to offset the straight line on the Y-axis (see section 6.6 Correcting the Re-
sults: Addition and Multiplication).
23. With TC: display of temperature-corrected density values.
23. Return to submenu group Data / Calculate with <
done
>.
24. Press <
run
> to start the measurement.
25. Calibrate once more (step 17.) if the current output limit value changes (see
page 19).
5.1.1.4 Two- and Multi-Point Calibration
The gradient of the calibration curve can be determined accurately. Select the
calibration mode depending on the number of value pairs.
Prerequisite:
Pipeline or container must be filled completely
1. Select menu group 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 measuring 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 inho-
mogeneous, take several samples in quick succession and calculate an av-
erage value from their density or concentration values.
10. Stop measurement by pressing the <
run
> button again.