Device Output Configuration - Emerson Rosemount 3144P Reference Manual

HART Commissioning
December 2019
3.9

Device output configuration

Device output configuration contains PV range values, alarm and saturation, HART output,
and LCD display options. PV range values;
HART 5 Fast
Keys
HART 7 Fast
Keys
Field Communicator
The PV URV and PV LRV commands, found in the PV Range Values menu screen, allow the
user to set the transmitter's lower and upper range values using limits of expected
readings. The range of expected readings is defined by the Lower Range Value (LRV) and
Upper Range Value (URV). The transmitter range values may be reset as often as necessary
to reflect changing process conditions. From the PV Range Values screen select 1 PV LRV
to change the lower range value and 2 PV URV to change the upper range value.
Reranging the transmitter sets the measurement range to the limits of the expected
readings, which maximizes transmitter performance; the transmitter is most accurate
when operated within the expected temperature range for the application.
The rerange functions should not be confused with the trim function. Although re-ranging
the transmitter matches a sensor input to a 4–20 mA output, as in conventional
calibration, it does not affect the transmitter's interpretation of the input.
3.9.1 Process variable damping
HART 5 Fast Keys
HART 7 Fast Keys
Field Communicator
The 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 loop dynamics of the system. The default damping value is 5.0
seconds and can be reset to any value between 1 and 32 seconds.
The value chosen for damping affects the response time of the transmitter. When set to
zero (disabled), the damping function is off and the transmitter output reacts to changes
in input as quickly as the intermittent sensor algorithm allows. Increasing the damping
value increases transmitter response time.
Damping
Damping values may be used for, and should equal, the update rate for Sensor 1, Sensor 2,
and sensor differential. Sensor configuration automatically calculates a damping value.
The default damping value is five seconds. Damping may be disabled by setting the
102
2, 2, 5, 5
2, 2, 5, 5
Sensor 1: 2, 2, 1, 6
Sensor 2: 2, 2, 2, 6
Sensor 1: 2, 2, 1, 7
Sensor 1: 2, 2, 2, 7
Reference Manual
00809-0100-4021
Rosemount 3144P