Yokogawa digitalYEWFLO (DY) - Manual (Page 56)

MAINTENANCE
IM 1F2B4-01-YIA
Page 60
4.1.2 Adjusting zero and span
Zero Adjustment
There is no zero adjustment required on the YEWFLO. This is a procedure frequently required on other
types of flowmeters but is not applicable to the YEWFLO vortex flowmeter. If the vortex meter provides
an output in a no flow situation refer to the signal processing section or troubleshooting section of this
manual.
Span Adjustment
All YEWFLO vortex meters, both analog and pulse output units, require an initial span setting. If you
provided the correct process conditions at the time of your order, span has been preset at the factory. If it
is necessary to change this value, follow this procedure to make a span adjustment.
BT200 handheld terminal BT100 handheld terminal
B :SET 1 Using the up/down arrows,
scroll to the B :SET 1 menu and
press ENTER. Depress the Me
nu key until
B :Set 1 menu appears.
B51: SPAN FACTOR
E+1 Use the up/down arrow keys to
move through the parameter
list until B51: SPAN FACTOR is
displayed, press ENTER. Using the p r m tr key move
through the parameter listing
until B51 :Span Factor appears.
Select the desired SPAN FACTOR from the list. If the span value is
greater than 32,000 an exponential SPAN FACTOR (x 10 multiplier)
must be used. For example, a span value of 75,000; the flow span
(B52) would be set to 7,500 and the SPAN FACTOR would be set to
E+1 (10
1 ). 7,500 x 10 1 = 75,000.
Use the arrow keys to scroll
through the choice list, press
ENTER twice. Press F4,
OK. Use the INC or DEC key to
move through the choice list,
press ENT twice.
B52 :FLOW SPAN
7,500 Use the arrow key to move to
B52 :FLOW SPAN . Press
ENTER. Press the PRMTR key once
to move to parameter B52 :FLOW
SPAN
Input the flow span using the numeric keys
Press ENTER twice. Press
F4, OK. Press ENT twice.