<10. ACTUAL OPERATION>
10-1
IM 01E30D01-01EN
Afteryouhaveinstalledtheowtubeintothe
process piping, wired the input/output terminals,
set up the required parameters, and performed
a pre-operation zero adjustment, the magnetic
owmetershouldoutputanaccurateowsignal
fromitsterminalsassoonasowoftheuidtobe
measured begins.
IMPORTANT
Warm up the instruments for at least 30 minutes.
Performowmeasurement30minutesafter
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
outputforzeroowis0%.Althoughadjustmentto
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
tomatchthemagneticowmetertoitsoperating
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
• Zeroadjustmentshouldbecarriedout
before actual operation. Note that parameter
settings and update functions cannot be
carried out during this procedure (i.e., for
approximately 450 seconds).
• Zeroadjustmentshouldonlybecarriedout
whentheowtubehasbeenlledwiththe
measurementuid,wait10minutes,andthe
uidvelocityiscompletelyzerobyclosing
the valve.
• Eachtimethattheuidbeingmeasured
is changed, it will be necessary for zero
adjustmenttobecarriedoutforthenewuid.
• Whilezeroadjustmentisbeingcarriedout,
normally a current of 10.4 mA is output.
Since the current of 10.4 mA is output, when
zeroadjustmentiscarriedout,rstchange
the control loop to the manual mode, and
then set this parameter.
• Zeroadjustmentcannotbecarriedoutduring
occurring various alarms.
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