KROHNE OPTIMASS Series Handbook page 71

Note:
When changing from STOP into STANDBY the instrument will run through the STARTUP mode.
In addition to these 'standby' modes the SYSTEM CONTROL function provides a fully automated way
of switching to similar modes using either the density or temperature of the process fluid as a control
(see submenu 4.8).
Density Calibration Fct. 1.3
Calibrating the points can only be done when product is in the meter.
The two samples that the density has been calibrated at can be seen in the menu 1.3.1 for point 1 'DISP
PT 1' and 1.3.2 'DISP PT 2' for point 2.
If the product was air, pure water or town water then the product name will be displayed.
If the product type was 'other' the density will be shown in the units that the density was entered at
calibration time.
Factory Calibration
This enables the user to recall the factory calibration settings.
• Menu 1.3.5 FACTORY.SET
• Enter the menu
• Sure Yes/No
• Yes displays please wait while the calibration is restored.
• CALIB OK or CALIB FAIL is then displayed.
One Point Calibration
Menu 1.3.3 '1 POINT CAL' - This does not allow the user to decide which point to move; the converter
decides the most appropriate point to move. The user chooses the product type that is in the meter and
moves the best point.
The choices are Air, Pure water, Town water and Other.
If "Other" is selected, the product density needs to be entered. You can enter the density in any of the
normal density units.
If you select 'pure water', 'air' or 'town water' the density does not need to be entered.
Once selected PLEASE WAIT is displayed.
Density calibration should take about 1 second.
After this time the result of the calibration will be displayed.
CALIB OK - the point has been entered correctly.
To see which point has been changed go to menu 1.3.1 'DISP PT1' and 1.3.2 'DISP PT2'.
CALIB FAIL - the density calibration failed. There are a number of causes for this:
1. Not in measuring mode
2. The 2 points are too close
3. The 2 points fail a plausibility check
Normally a 1 point calibration is adequate for most density calibrations e.g. tailoring the density to the
new installation.
The 1 point calibration can be done twice, with two different products to achieve a 2 point calibration.
However, there is no guarantee that the first point is entered will not be moved when the second point is
entered. In this case, it is better to use the two point calibration method.
Two Point Calibration
This is when the user wants to enter 2 set points.
The 2 point calibration makes sure that the 2 points entered by the user are used.
Warning - 2 point calibration will restore the factory calibration data before calibrating the 1st point.
Menu 1.3.4 '2 POINT CAL'
Sure Yes/No
Installation and Operating Instructions OPTIMASS 70