121
Reference Manual
00809-0100-4021, Rev JA
HART Commissioning
April 2017
HART Commissioning
3.16.3
Transmitter-sensor matching
The transmitter accepts CVD constants from a calibrated RTD schedule and generates a special custom
curve to match that specific sensor resistance vs. temperature performance. Matching the specific sensor
curve with the transmitter significantly enhances the temperature measurement accuracy. See the
comparison below:
Problem description: Depending on the process being measured, a certain amount of accuracy may be
needed from the sensor.
Our solution: A more precise compensation for RTD inaccuracies is provided by Transmitter-Sensor
Matching using the transmitter's factory programmed CVD equation. This equation describes the
relationship between resistance and temperature of platinum resistance thermometers (RTDs). The
matching process allows the user to enter the four sensor specific CVD constants into the transmitter.
The transmitter uses these sensor-specific constants in solving the CVD equation to match the
transmitter to that specific sensor thus providing outstanding accuracy. See comparison below:
Take away: “Transmitter-Sensor Matching customizes sensor curves to minimize sensor inaccuracy”
Note
In order to use this diagnostic, the RTD must be set as type
Cal VanDusen
.
Configure Transmitter Sensor Matching in guided setup
Note
The guided setup will take you through the complete sensor configuration. This document will guide you
through the specific Transmitter Sensor Matching section.
HART 7 Fast Keys
Sensor 1 - 2, 2, 1, 11
HART 7 Fast Keys
Sensor 1 - 2, 2, 2, 11
System accuracy comparison at 150 °C using a PT 100 (
α
=0.00385)
RTD with a span of 0 to 200 °C
Standard RTD
Matched RTD
Rosemount 3144P
±0.08 °C
Rosemount 3144P
±0.08 °C
Standard RTD
±1.05 °C
Matched RTD
±0.18 °C
Total System
(1)
1.
Calculated using root-summed-squared (RSS) statistical method.
±1.05 °C
Total System
±0.21 °C
System accuracy comparison at 150 °C using a PT 100 (
α
=0.00385)
RTD with a span of 0 to 200 °C
Standard RTD
Matched RTD
Rosemount 3144P
±0.08 °C
Rosemount 3144P
±0.08 °C
Standard RTD
±1.05 °C
Matched RTD
±0.18 °C
Total System
(1)
1.
Calculated using root-summed-squared (RSS) statistical method.
±1.05 °C
Total System
±0.21 °C
Содержание Rosemount 3144P
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