Limit Page
Figure 67: Limit value settings
Min Flow Limit
A minimum rate setting establishes the filter software parameters and the lowest rate value to display . Volumetric entries
display in the
Flow Units
selected in
Meter > Flow
.
• For unidirectional measurements, set the
Min Flow Limit
to zero .
• For bidirectional measurements, set the
Min Flow Limit
to the highest negative (reverse) flow rate expected in the
piping system .
The flow meter does not display a flow rate at flows less than the
Min Flow Limit
value . As a result, if the
Min Flow Limit
is set to
a value greater than zero, the flow meter displays the
Min Flow Limit
value, even if the actual flow/energy rate is less than the
set
Min Flow Limit
.
For example, if the
Min Flow Limit
is set to 25 and the actual rate is 0, the flow meter displays 25 .
If the
Min Flow Limit
is set to –100 and the actual flow is –200, the flow meter displays –100 . This can be a problem if the
meter’s
Min Flow Limit
is set to a value greater than zero because at flows below the
Min Flow Limit,
the flow meter displays
zero flow, but the totalizer, which is not affected by the
Min Flow Limit
setting, continues totalizing .
Max Flow Limit
A maximum flow rate setting establishes the filter software settings and the highest rate value to display . Volumetric entries
display in the
Rate Units
selected in
Meter > Flow
.
For both unidirectional and bidirectional measurements, set the
Max Flow Limit
to the highest (positive) flow rate expected
in the piping system .
Low Flow Limit
A
Low Flow Limit
entry allows the flow meter to display very low flow rates (that can be present when pumps are off and valves
are closed) as zero flow . Typical values are 1 .0…5 .0% of the
Min Flow Limit
.
The
Low Flow Limit
is the minimum flow rate at which the meter gives reliable readings .
Meter Group
Page 53
November 2016
HYB-UM-00090-EN-04