YOKOGAWA ADMAG AXR - 10. ACTUAL OPERATION; 10.1 Pre-operation Zero Adjustment

<10. ACTUAL OPERATION>
10-1
IM 01E30D01-01EN
Afteryouhaveinstalledtheowtubeintothe
process piping, wired the input/output terminals,
set up the required parameters, and performed
a pre-operation zero adjustment, the magnetic
owmetershouldoutputanaccurateowsignal
fromitsterminalsassoonasowoftheuidtobe
measured begins.
IMPORTANT
Warm up the instruments for at least 30 minutes.
Performow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ow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owmeter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owtubehasbeenlledwiththe
measurementuid,wait10minutes,andthe
uidvelocityiscompletelyzerobyclosing
the valve.
• Eachtimethattheuidbeingmeasured
is changed, it will be necessary for zero
adjustmenttobecarriedoutforthenewuid.
• 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,rstchange
the control loop to the manual mode, and
then set this parameter.
• Zeroadjustmentcannotbecarriedoutduring
occurring various alarms.