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10. ACTUAL OPERATION
After you have installed the flowtube into the
process piping, wired the input/output terminals,
set up the required parameters, and performed
a pre-operation zero adjustment, the magnetic
flowmeter should output an accurate flow signal
from its terminals as soon as flow of the fluid to be
measured begins.
IMPORTANT
Warm up the instruments for at least 30 minutes.
Perform flow measurement 30 minutes after
turning on the power.
This section describes zero adjustment and the
corresponding procedures.
10.1 Pre-operation Zero
Adjustment
Zero adjustment is carried out to ensure that the
output for zero flow is 0%. Although adjustment to
zero is performed at the manufacturing plant prior to
shipment, this procedure must be carried out once
again following the installation of piping in order
to match the magnetic flowmeter to its operating
conditions.
This section describes the zero adjustment
procedure using display unit switches from the
converter and using the external status input;
accordingly, one of these methods should be
selected and implemented.
<10. ACTUAL OPERATION>
IMPORTANT
• Zero adjustment should be carried out
before actual operation. Note that parameter
settings and update functions cannot be
carried out during this procedure (i.e., for
approximately 450 seconds).
• Zero adjustment should only be carried out
when the flowtube has been filled with the
measurement fluid, wait 10 minutes, and the
fluid velocity is completely zero by closing
the valve.
• Each time that the fluid being measured
is changed, it will be necessary for zero
adjustment to be carried out for the new fluid.
• While zero adjustment is being carried out,
normally a current of 10.4 mA is output.
Since the current of 10.4 mA is output, when
zero adjustment is carried out, first change
the control loop to the manual mode, and
then set this parameter.
• Zero adjustment cannot be carried out during
occurring various alarms.
10-1
IM 01E30D01-01EN
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