Manual

<6. PARAMETER DESCRIPTION>
6-17
IM 01E30D01-01EN
NOTE
Iftheowrateunits,timeunits,andow
ratespanarespecieduponordering,these
parameters will be setup before shipment;
however, if this is not the case, it will be
necessary for the appropriate values to be set up
by the user.
NOTE
Flow rate span is the value for instantaneous
owratethatcorrespondstoacurrentoutputof
20 mA. The following factors should be taken
intoconsiderationwhendecidingontheowrate
span.
• In the case of applications with large
variationsinowrate,themaximumowrate
shouldbeset.Ifaowrateinexcessofthe
owratespanwastooccur,outputwouldbe
possible up to an upper limit of 103.13%, and
beyond this, error would occur. Note that the
same applies to pulse output and totalization.
• In the case of applications that have a
relativelystableowrate,aowratespanof
1.5to2.0timeslargerthanthenormalow
rate may be considered suitable.
• Theowratetobeadoptedshould-upon
conversiontoowvelocity-correspondto
a value within the range of 0.3 to 10 m/s.
Theowvelocitycanbeconrmedusing
sizing data or with parameter C44: Velocity
Check, and in the latter case, the value
obtainedwhenspanisconvertedtoow
velocity will be displayed.
• Regardless of the position of the decimal
point, the largest value that can be set on the
display unit is 32,000. Furthermore, it is not
possible to set a number of 4 or greater for
the highest-order digit. Similarly, if 3 is set for
this highest-order digit, it will not be possible
to set a number of 2 or greater for the next
digit to the right, regardless of the position of
the decimal point.
Example: A value of 333.33 is represented
by the character string 33333, and
since this exceeds 32000, it cannot
be set. In such a case, the value
333.3 should be set instead.
[B24: Flow Decimal Pnt] Setting of the decimal
p
ointpositionfortheinstantaneousowrate
→ This setting is linked with that of parameter C43.
This parameter sets the position of the decimal
pointforinstantaneousowratevaluesinterms
of the number of digits. When set using “Auto”,
the decimal point position will be automatically
determined in accordance with the setting value for
B23/C42:FlowSpan as shown below.
FlowSpan≤9 Decimalpointposition:
3 digits
9<FlowSpan≤90 Decimalpointposition:
2 digits
90<FlowSpan≤900 Decimalpointposition:
1 digit
900 < Flow Span Decimal point position:
no digits (i.e., no decimal
point)
When an item other than “Auto” is set, the selected
number of digits for the decimal point position is
used.
With the decimal point removed, 6 digits are
availablefortheinstantaneousowratevalue,and
displayispossibleupto999,999.Ifanoverow
occurs as a result of the setting adopted for decimal
point position, the warning 84: Disp Over Wng will
bedisplayedtoprovidenoticationofthiscondition.
Example: When 1000 m
3
/hissetforB23/
C42: Flow Span
Item Displaycontentforinstantaneousowratevalue
Auto 1000 m
3
/h
0 1000 m
3
/h
1 1000.0 m
3
/h
2 1000.00 m
3
/h
3 With the decimal point removed, 7 digits are not
availablefortheinstantaneousowratevalue;
therefore, a warning is displayed.