Reference Manual
00809-0100-4021, Rev FB
August 2011
3-19
Rosemount 3144P
HAR
T
DEVICE OUTPUT
CONFIGURATION
Device output configuration contains PV range values, alarm and saturation,
HART output, and LCD display options.
PV Range Values
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. See Table A-1 on page A-5 for
unit and range setting limits. 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 reranging 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.
Process Variable
Damping
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 5
seconds. Damping may be disabled by setting the parameter damping
value to 0 seconds. The maximum damping value allowed is 32 seconds.
An alternate damping value may be entered with the following restrictions:
1.
Single Sensor Configuration:
• 50 Hz or 60 Hz Line Voltage Filters have a minimum
user-configurable damping value of 0.5 seconds
2.
Dual Sensor Configuration:
• 50 Hz Line Voltage Filter a minimum user-configurable damping
value of 0.9 seconds
• 60 Hz Line Voltage Filter a minimum user-configurable damping
value of 0.7 seconds
Traditional Fast Keys
1, 3, 4, 1
Device Dashboard
Fast Keys
2, 2, 5, 5
Traditional Fast Keys
1, 3, 4, 1, 3
Device Dashboard
Fast Keys
2, 2, 1, 6
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182
