KROHNE OPTIMASS with MFC 300 EN - Manual (Page 119)

119
Zero Calibration (Menu C1.1.1)
Following checks on the installation for soundness, it is necessary to set the zero point on the
meter prior to use.
All modifications/adjustments to the installation MUST be completed before the zero point is
set. Any modifications or changes (to piping or calibration factor) carried out after the zero
point has been set will render the performance of the meter unreliable and therefore will
require the zero point to be reset.
To achieve a successful zero calibration the following points MUST be noted:
• The primary head should be completely full of process fluid at normal operating pressures
and temperatures.
• All air MUST be exluded from the fluid, particularly for horizontal installations. It is recom-
mended that the primary head be flushed with the process fluid at a high flow rate (>50%),
for 2 minutes, prior to starting the adjustment.
• After flushing, flow in the primary head MUST be brought back to zero by tightly closing
appropriate valves.
The zero off-set can either be measured automatically or entered manually using the display
keys. If an automatic adjustment is to be made then the operator should trigger this, with the
front cover still in place.
A) Automatic Adjustment:
Key Text Displayed Description
>
A Quick Setup Countdown from 2.5 s to 0.0 s, then release key
C Setup
> > >
C1.1.1 Zero Calibration
> Calibrate Zero?
Break
Calibrate Zero?
Automatic
g
Please Wait
Countdown from 32s
Zero Calibration
+XX.XXX%
Displays zero value in %
Note: Care MUST be taken as the value can be
edited!
g
x 5
Save Configuration?
Yes
Accept Zero
g
Measuring Page
Automatic
Yes
Break