Operation; Adjustment; Zero Adjustment; Span Adjustment - YOKOGAWA DY025 User Manual

6. OPERATION

After you have installed the flowmeter into the process
piping, wired the input/output terminals, set up the required
parameters, the vortex flowmeter should output an accurate
flow signal from its terminals as soon as the measured liquid
begins to flow.
This section describes procedure of test method and adjust-
ment method for the pre-operation.
NOTE
The initial parameter setting has already been
done at the factory according to the sizing data
when ordering. Therefore it is not necessary to
set parameters except measurement condition
changes or some additions happen.

6.1 Adjustment

6.1.1 Zero Adjustment

No zero adjustment is necessary since the zero point does not
shift.
Because of the effect of electrical noise and vibration noise,
digitalYEWFLO may provide an output even when the
flowrate is zero. In that case, properly eliminate the source of
the noise.
Refer to "6.2 : Adjustment for manual mode".

6.1.2 Span Adjustment

In normal application, you need not confirm the span.
If you need to ensure the output of 4 to 20mA DC, refer to

"6.1.3 Loop Test".

6.1.3 Loop test
To ensure output of 4 to 20mA DC or pulse, their loop tests
can be done using parameter "J10 (Analog out)" or "J20
(Pulse test)".
If you are verifying the analog output, follow the procedure
on the verification procedure.
<Check Procedure>
1. Connect the instruments referring to Figure 6.1, and warm
up for three minutes more.
2. Set span frequency in Parameter J10:OUT ANALOG.
3. In case the load resistance is 250 ohm, digital multimeter
indicates 5V. Otherwise if it is known load resistance
value, it indicates R x 0.02A.
4. Check output value after set 50% in Parameter J10.
5. Check output value after set 0% in Parameter J10.
SUPPLY
SUPPLY
Figure 6.1 Connection of Maintenance Instruments
IMPORTANT
• When using any test-purpose measuring
instruments, do not ground them.
• All of your parameter settings will be cancelled
if you turn digitalYEWFLO off less than 30
seconds after the parameter setup. Keep
digitalYEWFLO turned on at least 30 seconds
after setting up the parameters.
6.1.4 Totalizer Function Start and Total-
ized Value Reset
When using the Totalizer Function, the start setup should be
done.
(1) Start operation using BT200
Enter to B40(TOTAL START), and move the video bar
to "EXECUTE". Push "ENTER" key at 2 times.
(2) Start operation using indicator
Enter to "Setting mode", move to B40 of parameter
number, and enter to "01" of data number.
Refer to "4.4: Setting mode".
Totalized value can be reset using the indicator or BT200.
(1) Reset operation using BT200
Enter to B42 (TOTAL RESET), and move the video bar
to "EXECUTE". Push "ENTER" key at 2 times.
(2) Reset operation using indicator
Enter to "Setting mode", move to B42 of parameter
number, and enter to "01" of data Number.
Refer to "4.4 : Setting mode".
6-1
6. OPERATION
24V DC
+
±10%
250Ω
–
BT200
F060101.EPS
IM 01F06A00-01E