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Reference Manual
00809-0100-4021, Rev DA
November 2004
A-5
Rosemount 3144P
Ambient Temperature Effect
Table A-1. Ambient Temperature Effect
Transmitters may be installed in locations where the ambient temperature is
between –40 and 85 °C (–40 and 185 °F).
To maintain excellent accuracy performance, each transmitter is individually
characterized over this ambient temperature range at the factory.
Temperature Effects Example
When using a Pt 100 (α = 0.00385) sensor input with a 0 to 100 °C span at
30 °C ambient temperature, the following statements would be true:
Digital Temp Effects
•
D/A Effects (HART / 4–20 mA only)
•
Worst Case Error
• Digital + D/A + Digital Temp Effects + D/A Effects = 0.10 °C + 0.02 °C +
0.015 °C + 0.01 °C = 0.145 °C
Total Probable Error
Sensor Options
Digital Accuracy per 1.0 °C (1.8 °F)
Change in Ambient
(1)
(1) Change in ambient is in reference to the calibration temperature of the transmitter (20° C [68° F])
Range D/A Effect
(2)
(2) Applies to HART / 4-20 mA devices.
2-, 3-, or 4- Wire RTDs
Pt 100 (α = 0.00385) 0.0015 °C Entire Sensor Input Range 0.001% of span
Pt 100 (α = 0.003916) 0.0015 °C Entire Sensor Input Range 0.001% of span
Pt 200 0.0023 °C Entire Sensor Input Range 0.001% of span
Pt 500 0.0015 °C Entire Sensor Input Range 0.001% of span
Pt 1000 0.0015 °C Entire Sensor Input Range 0.001% of span
Ni 120 0.0010 °C Entire Sensor Input Range 0.001% of span
Cu 10 0.015 °C Entire Sensor Input Range 0.001% of span
Thermocouples
Type B 0.014 °C
0.029 °C – 0.0021% of (R – 300)
0.046 °C – 0.0086% of (R – 100)
R ≥ 1000 °C
300 °C ≤ R < 1000 °C
100 °C ≤ R < 300 °C
0.001% of span
Type E 0.004 °C + 0.00043% of R 0.001% of span
Type J 0.004 °C + 0.00029% of R
0.004 °C + 0.0020% of abs. val. R
R ≥ 0 °C
R< 0 °C
0.001% of span
Type K 0.005 °C + 0.00054% of R
0.005 °C + 0.0020% of abs. val. R
R ≥ 0 °C
R < 0 °C
0.001% of span
Type N 0.005 °C + 0.00036% of R All 0.001% of span
Types R and S 0.015 °C
0.021 °C – 0.0032% of R
R ≥ 200 °C
R < 200 °C
0.001% of span
Type T 0.005 °C
0.005 °C + 0.00036% of abs. val. R
R ≥ 0 °C
R < 0 °C
0.001% of span
DIN Type L 0.0054 °C + 0.00029% of R
0.0054 °C + 0.0025% of abs. val. R
R ≥ 0 °C
R < 0 °C
0.001% of span
DIN Type U 0.0064 °C
0.0064 °C + 0.0043% of abs. val. R
R ≥ 0 °C
R < 0 °C
0.001% of span
Type W5Re/W26Re 0.016 °C
0.023 °C + 0.0036% of R
R ≥ 200 °C
R < 200 °C
0.001% of span
Millivolt Input 0.00025 mV Entire Sensor Input Range 0.001% of span
2-, 3-, 4-wire Ohm Input 0.007 Ω Entire Sensor Input Range 0.001% of span
0.0015°C3020–()× 0.015°C=
0.01 of100[]30 20–()× 0.01°C=
%
0.10
2
0.02
2
0.015
2
0.01
2
++ + 0.10°C=