Sensor Configuration; Change Type And Connections; Transmitter-Sensor Matching - Emerson Rosemount 3144P Reference Manual

Reference Manual
00809-0100-4021, Rev AA
March 2002

Sensor Configuration

HART Fast Keys 1, 3, 2
Sensor configuration contains information for updating the sensor type,
connections, units, and damping.

Change Type and Connections

HART Fast Keys 1, 3, 2, 1
The Connections command allows the user to select the sensor type and the
number of sensor wires to be connected. Select from the following sensor
types:
• 2-, 3-, or 4-wire Pt 100, Pt 200, Pt 500, Pt 1000
platinum RTDs (α = 0.00385 Ω/Ω/°C)
2-, 3-, or 4-wire Pt 100 (α = 0.003916 Ω/Ω/°C)
•
• 2-, 3-, or 4-wire Ni 120 nickel RTDs
• 2-, 3-, or 4-wire Cu 10 RTDs
• IEC/NIST/DIN Type B, E, J, K, R, S, T thermocouples
• DIN type L, U thermocouples
• ASTM Type W5Re/W26Re thermocouple
• –10 to 100 millivolts
• 2-, 3-, or 4-wire 0 to 2000 ohms
Contact a Rosemount representative for information on the temperature
sensors, thermowells, and accessory mounting hardware that is available
through Rosemount, Inc.

Transmitter-Sensor Matching

HART Fast Keys 1, 3, 2, 1, 1
The Model 3144P accepts Callendar-Van Dusen constants from a calibrated
RTD schedule and generates a special custom curve to match that specific
sensor curve. Matching the specific sensor curve with the transmitter
significantly enhances the temperature sensor measurement accuracy. See
the comparison below:
System Accuracy Comparison at 150 °C Using a PT 100 (α=0.00385)
Standard RTD
Model 3144P
Standard RTD
(1)
Total System
(1) Calculated using root-summed-squared (RSS) statistical method
TotalSystemAccuracy
The following input constants, included with specially-ordered Rosemount
temperature sensors, are required:
R = Resistance at Ice Point
0
Alpha = Sensor Specific Constant
Beta = Sensor Specific Constant
Delta = Sensor Specific Constant
RTD with a Span of 0 to 200 °C
Matched RTD
±0.10 °C Model 3144P
±1.05 °C Matched RTD
±1.05 °C Total System
(
TransmitterAccuracy
=
Model 3144P
±0.10 °C
±0.18 °C
(1)
±0.21 °C
) ( )
2 2
SensorAccuracy
+
3-10