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IM 1E7B0-02E
8-1
8. ACTUAL OPERATION
8.
ACTUAL OPERATION
After you have installed the flowtube into the process
piping, wired the input / output terminals, set up the
required 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 adjust : one using the switches on the converter
panel and the other using the BT200. Use either
method.
Zero adjustment is made to set the instrument to 0%
(4mA) when the flow rate is 0.
The flow tube must be filled with fluid and let it stand
until all motion has ceased.
IMPORTANT
•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.
•Zero adjustment should be done prior to the
other operation. For 30 seconds during the zero
adjustment, any setting cannot be accepted.
8.1.1
Zero Adjustment Using Data
Setting Keys
The following two procedures can be used to perform
zero adjustment with the data setting keys.
(1) Hold Down the INC Key for Two Seconds in Flow
Rate Data Display Mode.
Display
Description
Code
Content
Call up the setting mode and set "01" in "C1".
(zero adjustment enable / inhibit)
Hold down the INC key for two seconds
in
flow
rate data display mode.
The display panel shows "-ZEro-".
After about 30 seconds, the zero correction is displayed.
Then the meter returns to data display mode.
00
01
INHIBIT
ENABLE
SET SHIFT INC
Default : 01
%
2 seconds
or longer
(2) Display "C2" and Press the SET key Twice.
Display
Description
Code
Content
Call up the setting mode and set "01" in "C1"
(zero adjustment enable/inhibit).
Call up "C2" and press the SET key twice
(as for data entry).
The display panel shows "-ZEro-".
After about 32 seconds, the zero correction is displayed.
Then the meter returns to data display mode.
00
01
INHIBIT
ENABLE
SET SHIFT INC
Twice
32 seconds
later
(Displays the
zero
correction)