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4.3
Installation factor
The extensive self-diagnosis functions of the MFM 2081 and MFM 3081 also include a so-
called installation factor. This factor indicates whether the flow meter has been correctly
installed in the pipeline. The installation factor should be checked during the initial start-up
phase. The installation factor can be checked by way of the keystroke combination described
in Section 5.
If correctly installed, the value of the installation factor when the primary head is full of water
should be as per the table below. If the figure is higher, the specified accuracy of the flow
meter cannot be guaranteed. Please check the installation again on the basis of the installation
information (Sect. 2). If necessary adjust clamping with the meter displaying the installation
factor to obtain optimum performance.
Primary Type
Installation
Factor
MFM 2081 K/F
< 50
MFM 2081 K/F
Ex
< 100
MFM 3081 K/F
< 20
MFM 3081 K/F
Ex
< 60
4.4
Zero point adjustment
After installation adjust the zero point. To do this, the primary head must be completely filled
with the liquid product without gas or air inclusions. This is best obtained by allowing the
liquid product to flow through the primary head for approx. 2 minutes at a throughput rate of
greater than 50% of rated flow. Subsequently ensure that flow comes to a complete stop in the
primary head (see fig 10, Section 2.2.2) for setting the zero without interruption to product
flow, use a bypass setup as shown in fig. 11 (Section 2.2.2).
Now initiate zero adjustment from measuring mode as described in Section 6.1.
Under certain conditions, it may not be possible to adjust the zero point:
–
If the medium is in motion. Shut-off valves not tightly closed.
–
If there are gaseous inclusions in the primary head. Flush the primary head and repeat the
calibration.
–
If resonant oscillations of the piping are interfering with the primary head. Check the
clamping of the instrument.
–
If there are active warning(s) in the status message list. (See section 5.6)
In such cases, the zero point adjustment procedure is automatically aborted and the following
message is displayed for a short time:
ZERO.ERROR
Then the converter returns to the start of the Zero Set function 1.1.1:
Further information on zero point adjustment is given in Section 5.
The CORIMASS MFM 2081 and MFM 3081 are ready to operate after zero has been adjusted.
All parameters have been factory-set in keeping with the data specified in your order. Detailed
information for further setting of the signal converter will be found in Part B of the operating
instructions.
