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Reference Manual
00809-0100-4808, Rev CA
June 2008
2-9
Rosemount 3051N
FIGURE 2-5. Square Root
Output Transition Point.
Rerange The Range Values command sets the 4 and 20 mA points (lower and upper
range values). Setting the range values to the limits of expected readings
maximizes transmitter performance. In practice, you may reset the transmitter
range values as often as necessary to reflect changing process conditions.
You may use one of three methods to rerange the transmitter. Each method is
unique; examine all three closely before deciding which method to use.
Rerange with a
Communicator Only
Reranging using only the communicator changes the values of the analog 4
and 20 mA points independently without a pressure input.
NOTE
Changing the lower or upper range point results in similar changes to the
span.
To rerange using only the communicator, enter the fast-key sequence above,
select 1 Keypad input, and follow the on-line instructions. Or enter the values
directly from the ONLINE screen.
Sq. Root
Curve
Transition Point
Linear Section
Slope=1
Slope=42
Transition
Point
Sq. Root Curve
Full Scale
Flow (%)
Full Scale Output
(mA dc)
HART Comm. 1, 2, 3, 1, 1