Yokogawa ADMAG CA - Manual (Page 66)

IM 1E8B0-01E
8-1
8. ACTUAL OPERATION
8. ACTUAL OPERATION
After you have installed the flowtube into the process piping, wired the input / output
functions, set up the required converter parameters, and performed the pre-operation
zero adjustment, the magnetic flowmeter should output an accurate flow signal from its
terminals as soon as the measured liquid begins to flow.
This section describes procedures of zero adjustment and alarms countermeasure.
8.1 Pre-Operation Zero Adjustment
In the magnetic flowmeter, zero adjustment is required before beginning operation in
order to obtain a 4 to 20mA signal that is accurately proportional to the flow.
This section describes two procedures for performing zero adjustment. Using the data
setting keys on the converter front panel or using a BT200.
Zero adjustment is made to set the instrument output to 0% (4mA) when the flow rate is
0.
The detector must be filled with fluid and let it stand until all motion has ceased.
1. Zero adjustment should be done only when the fluid is filled in the flow
tube and the fluid velocity is completely zero by closing the valve.
2. Zero adjustment should be done prior to the other operation. For 60
seconds during the zero adjustment, any setting cannot be accepted.
3. As warming up time for converter, please wait 5 min. for size 15 to 100
mm (0.5 to 4 in) or 10 min. for size 150, 200 mm (6, 8 in) before zero
adjustment after the power is turned on.
IMPORTANT