Emerson Process Management rosemount 3300 series manual DQG P$3RLQWV, Range Values

Rosemount 3300 Series

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00809-0100-4811, Rev AA October 2002

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1, 3, 3, 2

When setting the range values, it is possible to enter the values directly using the keypad on the HART 275 Communicator, or you may use actual values (HART command [1, 3, 3, 1]). Keep in mind that the 20 mA value should be below the Upper Dead Zone. If the 20 mA point is set to a point within the Dead Zone the full range of the analog output is not used.

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 6HFWLRQ￿￿￿￿'LVWXUEDQFHV￿DW￿WKH￿WRS￿RI￿WKH￿WDQN). The UNZ

is equal to zero in the default configuration.

The 4 mA point should be above the Lower Dead Zone. If the 4 mA point is set to a point within the Dead Zone or below the probe end (tank bottom for example), the full range of the analog output is not used.

See Section 2: Dead Zones for more information on the size of Upper and Lower Dead Zones.

Figure 4-7. Range Values

4 20 MA POINTS

Upper Reference Point	￿
Upper Dead Zone	+,￿￿￿￿<￿￿￿￿￿￿￿￿￿￿￿>￿￿￿￿￿7<￿>8
	9￿￿￿!￿￿￿￿￿￿￿￿￿￿￿>￿￿￿￿￿
Product Level	7!￿>8
Interface Level
Lower Dead Zone

4-12