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Reference Manual
00809-0100-4027, Rev AA
December 2005
3-9
Rosemount 4500
Rerange with a HART Communicator Only
The easiest way to rerange is to use the HART Communicator only. This
method changes the values of the analog 4 and 20 mA points independently
without a pressure input.
From the HOME screen, enter the fast key sequence for “Rerange with a
Communicator Only.”
1. At “Keypad Input” select 1 and use the keypad to enter lower range
value.
2. From “Keypad Input” select 2 and use the key pad to enter upper range
value.
Rerange with a Pressure Input Source and HART Communicator
Reranging using the HART Communicator and a pressure source or process
pressure allows reranging the transmitter when specific 4 and 20 mA points
are unknown.
NOTE
The span is maintained when the 4 mA point is set. The span changes when
the 20 mA point is set. If the lower range point is set to a value that causes the
upper range point to exceed the sensor limit, the upper range point is
automatically set to the sensor limit, and the span is adjusted accordingly.
1. From the HOME screen, enter the fast key sequence for “Rerange with a
Pressure Input Source and a HART Communicator” to configure lower
and upper range values and follow the on-line instructions.
Rerange with a Pressure Input Source and the
Local Zero and Span buttons (option D1)
The transmitter may be reranged using the local zero and span adjustments
and a pressure source.
1. Using a pressure source with an accuracy three to ten times the desired
calibrated accuracy, apply a pressure equivalent to the lower range value
to the transmitter.
2. Push and hold the zero adjustment button for at least two seconds but no
longer than ten seconds.
3. Apply a pressure equivalent to the upper range value to the transmitter.
4. Push and hold the span adjustment button for at least two seconds but
no longer than ten seconds.
Fast Keys
1, 2, 3, 1, 1
Fast Keys
1, 2, 3, 1, 2
ALARM
SPAN
-LOOP
+LOOP
ZERO
SECURITY
Span
Zero