Emerson Process Management 5300 manual Output Source/Primary Variable, Upper/Lower Range Value

Reference Manual

00809-0100-4530, Rev BA July 2009

Rosemount 5300 Series

Analog Output (HART) The Output Source (Primary Value), Range Values and Alarm Mode are specified for the analog output.

Figure 5-5. Example of Range

Value settings

Upper Reference Point

Upper Transition Zone

Product Level

Lower Transition Zone

20 mA Upper Range Value (URV) = 100%

Range 0-100%

4 mA Lower Range Value (LRV) = 0%

Lower Reference Point (Level=0)

Output Source/Primary Variable

Specify the source to control the analog output. Typically, the Primary Value is configured to be the Product Level.

Upper/Lower Range Value

Enter the range values that correspond to the analog output values

4 and 20 mA. It is recommended that the 4 mA and 20 mA values are set outside the Transition Zones. See “Transition Zones” on page 2-10for more information.

If a measured value goes beyond the measurement range, the transmitter enters saturation mode (limit alarm is disabled) or alarm mode depending on the current configuration.

Also make sure that the 20 mA value is below the Upper Null Zone (UNZ). (This parameter may be used if there are measurement problems in the upper part of the tank, see “Handling of Disturbances from Nozzle” on page C-4). The UNZ is equal to zero in the default configuration.

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