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9. ACTUAL OPERATION
9.
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. This section describes zero
adjustment and the corresponding procedures.
9.1 Pre-operation Zero
Adjustment
Zero adjustment is carried out to ensure that the
output for zero flow is 0 % (i.e., 4 mA). 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.
IMPORTANT
• Zero adjustment should be carried out before
actual operation. Note that setting and update
functions cannot be carried out during this
procedure (i.e., for approximately 30 s).
• Zero adjustment should only be carried out
when the flowtube has been filled with fluid 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.
9-1
IM 01R21C01-01E-E
1st edition, Oct. 2006