91
Reference Manual
00809-0100-4021, Rev JA
HART Commissioning
April 2017
HART Commissioning
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.
3.9.1
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
five 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 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
Figure 3-8. Change in Input versus Change in Output with Damping Enabled
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
100.0
101.0
102.0
103.0
104.0
105.0
106.0
107.0
108.0
109.0
110.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5 10.0
Input Value
Output Value
Time (Seconds)
Te
m
p
e
ra
tu
re
Summary of Contents for Rosemount 3144P
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Page 10: ...8 Reference Manual 00809 0100 4021 Rev JA Title Page April 2017 Title Page ...
Page 16: ...6 Reference Manual 00809 0100 4021 Rev JA Introduction April 2017 Introduction ...
Page 38: ...28 Reference Manual 00809 0100 4021 Rev JA Installation April 2017 Installation ...
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