i
ndu
Q
®
- Series VMM
Operation
Technical changes reserved
- 33 -
After choosing the function Volume flow up-
per-range value and pressing the ENTER
key, the following selection field will be dis-
played.
Example:
The unit for the QV URV is defined by the
function
Volume flow unit
.
7.1.5.2
Limit value messages
Fig: Limit value message and hysteresis.
Volume flow limit MIN:
The MIN limit value for volume flow can be
shown by the status output.
The value for
volume flow limit MIN
is
a percentage of the current measuring range
(lower-range value
QV LRV
to upper-range
value
QV URV
). If the volume flow falls below
that limit, the status output will be set and
the current output will change to alarm val-
ue, if the alarm functions have been enabled
(see Fig above).
For selecting the desired function please use
the key
or
. After choosing the function
Volume flow limit MIN
and pressing En-
ter, the following selection field will be dis-
played.
Example:
The value can be set in 1-percent incre-
ments.
Volume flow limit MAX:
The MAX limit value for volume flow can be
shown by the status output.
The value for volume flow limit MAX is a per-
centage of the current upper-range value QV
URV. If the volume flow surpasses this limit,
the status output will be set and the current
output will change to alarm value, if the
alarm functions have been enabled (see Fig
above).
For selecting the desired function please use
the key
or
. After choosing the function
Volume flow limit MAX
and pressing En-
ter, the following selection field will be dis-
played:
Example:
The value can be set in 1-percent incre-
ments.
QV limit hysteresis:
The value for Qv limit hysteresis is a per-
centage of the current upper-range value QV
URV. It specifies the difference between the
flow rate and the set volume flow limits
which is needed to reactivate respectively
deactivate the limit alarm.
For selecting the desired function please use
the key
or
. After choosing the function
QV limit hysteresis and pressing the ENTER
key, the following selection field will be dis-
played.
Example
The value can be set in 1-percent increments
from 0 to 10 %.
QV URV = 100%
+00005.00 USG/min
Flow limit
MIN = 10 %
Flow limit
MAX = 090 %
QV limit
hysteresis 00 %
