Instruction Manual
7-84
IM 01R04B04-00E-E 8th edition March 01, 2011 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
To set the functions of volume ow measurement. Notice: Volume ow
is derived density and mass ow measurement.
Errors in density measurement (e.g. from gas bubbles) effects the
accuracy of volume ow. For liquid it is recommended to use mass ow
as original measurement. Density below roh = 0.3 kg/l volume ow is
set to zero (for liquids)
Select:
only for gas application.
only for gas application or if Reference density
value is selected.
Select;
(low range value)
Set a volume ow value to the 4 mA or 0 Hz. LRV can also be negative
to measure reverse ow.
(upper range value)
Set a volume ow value to the 20 mA or xxxxx Hz.
Abs(URV-LRV) ≥ 5% of Qvnom for liquids.
For gas application Abs(URV-LRV) ≥ 1%
Set the damping time in s. Damping time affects outputs and display.
After 5 times damping time the given value is displayed (t=63%)
Set the low cut. Low cut affects outputs and display. Any low cut on
mass ow will affect volume ow also. A hysteresis of 0.05% of Qnom
on mass ow is given by the system.
Select:
Select a volume ow alarm level. What happens in case of an alarm
has to be dened in Status (7.12, 7.13).
Select:
Restrictions:
All alarms have to be in 0-110%
of URV-LRV.
Alarm criteria 2 must always be
larger than alarm criteria 1.
Select a volume ow alarm level. What happens in case of an alarm
has to be dened in Status out (7.12, 7.13).