Figure 22 - Typical Volumetric Flow Range Setting Values - Honeywell SmartLine Multivariable SMV800 Series User Manual

PV4 (Flow) Upper Range Limit (URL) and Range Values (LRV and URV)
Set the URL, LRV, and URV for calculated flow rate PV4 output by typing in the desired values on
the FlowConf tab card.
•
URL = Type in the maximum range limit that is applicable for your process conditions.
(100,000 = default)
•
LRV = Type in the desired value (default = 0.0)
•
URV = Type in the desired value (default = URL)
Be sure that you set the PV4 Upper Range Limit (URL) to desired value before you set
PV4 range values. We suggest that you set the PV4 URL to equal two times the maximum
flow rate (2 x URV).
About URL and LRL
The Lower Range Limit (LRL) and Upper Range Limit (URL) identify the minimum and maximum
flow rates for the given PV4 calculation. The LRL is fixed at zero to represent a no flow condition.
The URL, like the URV, depends on the calculated rate of flow that includes a scaling factor as well
as pressure and/or temperature compensation. It is expressed as the maximum flow rate in the
selected volumetric or mass flow engineering units.
About LRV and URV
The LRV and URV set the desired zero and span points for your calculated measurement range as
shown in the example in
Figure 22.

Figure 22 - Typical Volumetric Flow Range Setting Values

The default engineering units for volumetric flow rate is cubic meters per hour and tonnes
per hour is the default engineering units for mass flow rate. The URV changes automatically to
compensate for any changes in the LRV and maintain the present span (URV – LRV). If you
must change both the LRV and URV, always change the LRV first.
Damping
Adjust the damping time constant for flow measurement (PV4) to reduce the output noise. We
suggest that you set the damping to the smallest value that is reasonable for the process.
The damping values (in seconds) for PV4 are: 0.0, 0.5, 1.0, 2.0, 3.0, 4.0, 5.0, 10.0, 50.0 and 100.0
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SMV800 Series HART/DE Option User's Manual
Revision 6.0