Honeywell SMV800, Руководство пользователя

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Page 26 SMV800 Modbus User's Guide Revision 1.0
g/min Grams per Minute
g/sec Grams per Second
ton/h Tons per Hour (Short Tons)
ton/min Tons per Minute (Short Tons)
ton/sec Tons per Second (Short Tons)
Flow Upper Range Limit (URL) and Range Values (LRV and URV)
Set the URL, LRV, and URV for calculated flow rate output by typing in the desired values on the
Flow Config tab .
•
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)
ATTENTION: Be sure that you set the Flow Upper Range Limit (URL) to
desired value before you set Flow range values. We suggest that you set
the Flow 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 Flow 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 2-1.
Figure 2-1: Typical Volumetric Flow Range Setting Values