KROHNE MFC 400 EN - Manual (Page 91)

OPERATION
6
91
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
On-site density calibration:
• Ensure that the device has been properly installed and functions smoothly.
• If air (empty) is used as the medium, the measuring tube must be completely dry and free of
liquids and solids. If possible, blow dry air into the measuring tube to empty it.
• If liquids are used, flush for a few minutes at a high flow rate to remove gas bubbles.
• Set the flow rate to a typical value (50% of the nominal flow is ideal).
• If the process temperature is higher than the ambient temperature, wait until the system has
stabilised.
• When it comes to 1 point and 2 point calibration, you can choose from the options "empty",
"pure water", "town water" and "other". The reference values for the specified products are
stored in the converter.
Density calibration has failed if "Density Calib. Error" is displayed. The reason for the error may
be indicated on the display. Possible reasons for failed density calibration:
• The device is not in "Measuring" mode.
• The calibration points are too close together.
• One or more calibration points did not pass the plausibility test.
• Flow, pressure, temperature or system are not stable?
• Please check your system and try again.
• If this results in another failed calibration, please contact the manufacturer.
1 Point Calibration
• See examples for "Calibration with town water and other".
• Select the function using ↓ and ↑ and then confirm with ^.
• If "Other" is selected, the product density must be entered.
• 1 point calibration is generally sufficient for most applications, such as adapting the density
measurement to a new installation.
• Make sure that prior to calibrating the 2nd point that 1 point calibration was carried out and
that the result was saved with the dialog "Save Configuration?".
2 Point Calibration
• In this case, both reference points are recalibrated (with the products of the system).
• With 2 point calibration, ensure that both calibration points entered by the user are accepted.
If the 2nd point cannot be calibrated immediately after the first one, because the 2nd product is
not yet available, the device continues to function normally as after the 1 point calibration. In
other words, there can be weeks or even months between the calibration of the two measuring
points.
.book Page 91 Monday, August 26, 2013 9:05 AM