Yokogawa digitalYEWFLO (DY) - Manual (Page 95)

<10. OPERATION>
10-1
IM 01F06A00-01EN
After you have installed the fl owmeter into the
process piping, wired the input/output terminals, set
up the required parameters, the vortex fl owmeter
should output an accurate fl ow signal from its
terminals as soon as the measured liquid begins to
fl ow.
This section describes procedure of test method
and adjustment 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.
10.1 Adjustment
10.1.1 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 fl owrate is zero. In that case,
properly eliminate the source of the noise.
Refer to Section 10.2 “Adjustment for Manual
Mode.”
10.1.2 Span Adjustment
In normal application, you need not confi rm the
span.
If you need to ensure the output of 4 to 20mA DC,
refer to Subsection 10.1.3 “Loop Test.”
10.1.3 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 verifi cation procedure.
<Check Procedure>
1. Connect the instruments referring to Figure 10.1,
and warm up for three minutes more.
2. Set span frequency in Parameter J10:OUT
ANALOG.
3. In case the load resistance is 250 Ω, digital
multimeter indicates 5V. Otherwise if it is known
load resistance value, it indicates R (
Ω)  0.02
(A).
4. Check output value is in the rated value (±0.016
mA) after set 50% in Parameter J10.
5. Check output value is in the rated value (±0.016
mA) after set 0% in Parameter J10.
+
–
F1001.ai
250Ÿ
24V DC
±10%
BT200
digital
multimeter
SUPPLY
SUPPLY
Figure 10.1 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.
NOTE
When confi gure the parameters using the HART
Confi guration Tool, refer to Section 8.11 “Menu
Tree (HART 5)” or Section 9.11 “Menu Tree
(HART 7).”
10. OPERATION