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Reference Manual
00809-0100-4808, Rev CA
June 2008
Rosemount 3051N
2-12
Damping The process variable (PV) Damp command changes the response time of the
transmitter to smooth variations in output readings caused by rapid changes
in input. Determine the appropriate damping setting based on the necessary
response time, signal stability, and other requirements of the of loop dynamics
of your system. The default damping value is 0.4 seconds,
(1)
and can be reset
to any of eleven pre-configured, nominal damping values between 0 and 25.6
seconds.
LCD Meter Options The Meter Options command allows you to customize the LCD meter for use
in your application. You can configure the meter to display the
following information:
• Engineering Units
• Percent of Range
• User-Configurable LCD Scale
• Alternating between any two of the above
The user-configurable scale is a feature that enables you to configure the
LCD meter to a custom scale using a HART Communicator. With this feature
you can define the decimal point position, the upper range value, the lower
range value, the engineering units, and the transfer function. Refer to
“Custom Meter Configuration” in Section 6 for complete configuration
information.
DETAILED SETUP
Local Span and Zero
Control (Local Keys)
The Local keys command allows software control over the use of the local
span and zero adjustments. To enable or disable the span and zero
adjustment buttons on your transmitter, perform the fast key sequence at left.
NOTE
Disabling the local keys does not disable all transmitter configuration
changes. With the local keys disabled, you can still make changes to the
transmitter configuration—including range values—using a HART
Communicator.
Sensor Temperature
Output Unit Selection
The Sensor Temperature Output Unit Selection command selects between
Celsius and Fahrenheit units for output of the sensor temperature. The sensor
temperature output is accessible via HART only.
DIAGNOSTICS AND
SERVICE
The diagnostics and service functions listed here are primarily for use after
you install the transmitter in the field. The transmitter test feature is designed
to verify that the transmitter is operating properly, and can be performed either
on the bench or in the field. The loop test feature is designed to verify proper
loop wiring and transmitter output, and should only be performed after you
install the transmitter.
HART Comm. 1, 3, 6
(1) Rosemount 3051ND0 default damping is 3.2 seconds. Rosemount 3051ND1, with calibra-
tions below 2.5 inH
2
O (0,62 kPa), have damping set at 3.2 seconds.
HART Comm. 1, 4, 3, 4
HART Comm. 1, 4, 4, 1, 7
HART Comm. 1, 4, 1, 2, 2