6 volume flow functions (basic or detailed setup) – Yokogawa RotaMASS 3-Series User Manual

Page 156

7. pArAMETEr dESCrIpTION

7-84

IM 01R04B04-00E-E 8th edition March 01, 2011 -00

7.6 volume flow functions (Basic or detailed Setup)

volume flow

To set the functions of volume flow measurement. Notice: Volume flow
is derived density and mass flow measurement.
Errors in density measurement (e.g. from gas bubbles) effects the
accuracy of volume flow. For liquid it is recommended to use mass flow
as original measurement. Density below roh = 0.3 kg/l volume flow is
set to zero (for liquids)

vol flow unit

Select:
cm³/s, cm³/min, cm³/h, l/s, l/min, l/h, l/d, m³/s, m³/min, m³/h, m³/d,
gal/s, gal/min, gal/h, gal/d, Cuft/s, Cuft/min, Cuft/h, Cuft/d, bbl/s,
bbl/min, bbl/h, bbl/d, Impgal/s, Impgal/min, Impgal/h, Impgal/d,
I(N)/s, I(N)/min, I(N)/h, l(N)/d, m³(N)/s, m³(N)/min, m³(N)/h, m³(N)/d,
SI/s, SI/min, SI/h, Sl/d, Scuft/s, Scuft/min, Scuft/h, Scuft/d, Sm³/s,
Sm³/min, Sm³/h, Sm³/d

I(N)/s, I(N)/min, I(N)/h, l(N)/d, m³(N)/s, m³(N)/min, m³(N)/h, m³(N)/d
only for gas application.
SI/s, SI/min, SI/h, Sl/d, Scuft/s, Scuft/min, Scuft/h, Scuft/d, Sm³/s,
Sm³/min, Sm³/h, Sm³/d only for gas application or if Reference density
value is selected.

vol flow format

Select;

xxxxxxx, xxxxx.X, xxxx.XX, xxx.XXX, xx.XXXX, x.XXXXX

vol flow lrv
(low range value)

Set a volume flow value to the 4 mA or 0 Hz. LRV can also be negative
to measure reverse flow.

vol flow Urv
(upper range value)

Set a volume flow value to the 20 mA or xxxxx Hz.
Abs(URV-LRV) ≥ 5% of Qvnom for liquids.
For gas application Abs(URV-LRV) ≥ 1%

vol flow damping

Set the damping time in s. Damping time affects outputs and display.
After 5 times damping time the given value is displayed (t=63%)

vol flow lowcut

Set the low cut. Low cut affects outputs and display. Any low cut on
mass flow will affect volume flow also. A hysteresis of 0.05% of Qnom
on mass flow is given by the system.

vol flow alm 1 sel

Select:

No function, More than, less than

vol flow alm 1 crit

Select a volume flow alarm level. What happens in case of an alarm
has to be defined in Status (7.12, 7.13).

vol flow alm 2 sel

Select:

No function, More than, less than

vol flow alm 2 crit
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 flow alarm level. What happens in case of an alarm
has to be defined in Status out (7.12, 7.13).