http://www.ibiblio.org/kuphaldt/socratic/sinst/book/liii_1v36.pdf
Hart 275 Manual ***Link
Rosemount 3051 Reference Manual
Rerange (pfd p. 54) The Range Values
command sets each of the lower and upper range analog
values (4 and 20 mA points and 1 and 5
Vdc points) to a pressure. The lower
range point represents 0% of range and
the upper range point represents
100% of range. In practice, the
transmitter range values may be changed as
often as necessary to reflect changing
process requirements. For a complete
listing of Range & Sensor limits,
refer to “Range and Sensor Limits” on
page A-4.
NOTE
Transmitters are shipped from Emerson
Process Management fully calibrated
per request or by the factory default
of full scale (zero to upper range limit).
NOTE
Regardless of the range points, the
3051 will measure and report all readings
within the digital limits of the sensor.
For example, if the 4 and 20 mA points
are set to 0 and 10 inH2O, and the
transmitter detects a pressure of 25 inH2O,
it digitally outputs the 25 inH2O
reading and a 250% of range reading.
P.56
Reranging using the Field Communicator
and applied pressure is a way of
reranging the transmitter when
specific 4 and 20 mA points (1 and 5 Vdc
points) are not calculated.
Sensor
Trim
P. 80
Sensor Trim Overview
Trim
the sensor using either sensor or zero trim functions. Trim functions vary
in
complexity and are application-dependent. Both trim functions alter the
transmitter’s
interpretation of the input signal.
…
Sensor trim is a two-point sensor calibration where two end-point pressures
Sensor trim is a two-point sensor calibration where two end-point pressures
are applied, and all output is
linearized between them. Always adjust the low
trim value first to establish the
correct offset. Adjustment of the high trim value
provides a slope correction to the
characterization curve based on the low
trim value. The trim values allow you
to optimize performance over your
specified measuring range at the calibration temperature.
See next page--à
ANALOG OUTPUT TRIM --------(Digital-to-Analog Trim)
p. 77
The Analog Output Trim commands allow
you to adjust the transmitter’s
current output at the 4 and 20 mA (1
and 5 Vdc) points to match the plant
standards. This command adjusts the digital to analog
signal conversion.
Zero Trim 275 Hart Communicator---
HART communicator connection points Communicator loop resistance video
- Read this PDF on JouleDeadweight Tester
- *operating instructions start on p. 20
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