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Reference Manual
00809-0100-4021, Rev GC
Section 3: HART commissioning
April 2014
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 re-range 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.
3.8.2
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
HART 5 Fast Keys
Sensor 1: 2, 2, 1, 6
Sensor 2: 2, 2, 2, 6
HART 7 Fast Keys
Sensor 1: 2, 2, 1, 7
Sensor 1: 2, 2, 2, 7
Summary of Contents for Rosemount
Page 1: ...Reference Manual 00809 0100 4021 Rev GC April 2014 Rosemount 3144P Temperature Transmitter ...
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Page 4: ...iv Reference Manual 00809 0100 4021 Rev GC Title Page April 2014 ...
Page 10: ...x Reference Manual 00809 0100 4021 Rev GC Table of Contents April 2014 Table of Contents ...
Page 38: ...28 Reference Manual 00809 0100 4021 Rev GC Section 2 Installation April 2014 Installation ...
Page 188: ...178 Reference Manual 00809 0100 4021 Rev GC Section 5 Maintenance April 2014 Maintenance ...
Page 250: ...Index 244 Reference Manual 00809 0100 4021 Rev GC Index April 2014 Index ...
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