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Reference Manual
00809-0100-4021, Rev DA
November 2004
Rosemount 3144P
A-4
Accuracy
Reference Accuracy Example (HART only)
When using a Pt 100 (α = 0.00385) sensor input with a 0 to 100 °C span:
Digital Accuracy would be ±0.10 °C, D/A accuracy would be ±0.02% of 100 °C
or ±0.02 °C, Total = ±0.12 °C.
Differential Capability Exists Between Any Two Sensor Types
(dual-sensor option)
For all differential configurations, the input range is X to Y where:
• X = Sensor 1 minimum – Sensor 2 maximum and
• Y = Sensor 1 maximum – Sensor 2 minimum.
Digital Accuracy for Differential Configurations (dual-sensor option,
HART only)
• Sensor types are similar (e.g., both RTDs or both T/Cs): Digital Accuracy =
1.5 times worst case accuracy of either sensor type.
• Sensor types are dissimilar (e.g., one RTD, one T/C): Digital Accuracy =
Sensor 1 Accuracy + Sensor 2 Accuracy.
Sensor Options Sensor Reference Input Ranges
Recommended
Min. Span
(1)
(1) No minimum or maximum span restrictions within the input ranges. Recommended minimum span will hold noise within accuracy specification with damping
at zero seconds.
Digital
Accuracy
(2)
(2) Digital accuracy: Digital output can be accessed by the 375 Field Communicator.
D/A
Accuracy
(3)(4)
(3) Total Analog accuracy is the sum of digital and D/A accuracies.
(4) Applies to HART / 4-20 mA devices.
2-, 3-, 4-wire RTDs °C °F °C °F °C °F
Pt 100 IEC 751, 1995 (α = 0.00385) –200 to 850 –328 to 1562 10 18 ± 0.10 ± 0.18 ±0.02% of span
Pt 100 JIS 1604, 1981 (α = 0.003916) –200 to 645 –328 to 1193 10 18 ± 0.10 ± 0.18 ±0.02% of span
Pt 200 IEC 751, 1995 (α = 0.00385) –200 to 850 –328 to 1562 10 18 ± 0.22 ± 0.40 ±0.02% of span
PT 500 IEC 751, 1995 (α = 0.00385) –200 to 850 –328 to 1562 10 18 ± 0.14 ± 0.25 ±0.02% of span
Pt 1000 IEC 751, 1995 (α = 0.00385) –200 to 300 –328 to 572 10 18 ± 0.10 ± 0.18 ±0.02% of span
Ni 120 Edison Curve No. 7 –70 to 300 –94 to 572 10 18 ± 0.08 ± 0.14 ±0.02% of span
Cu 10 Edison Copper Winding No. 15 –50 to 250 –58 to 482 10 18 ±1.00 ± 1.80 ±0.02% of span
Thermocouples
(5)
(5) Total digital accuracy for thermocouple measurement: sum of digital accuracy +0.25 °C (0.45 °F) (cold junction accuracy).
Type B
(6)
(6) Digital accuracy for NIST Type B is ±3.0 °C (±5.4 °F) from 100 to 300 °C (212 to 572 °F).
NIST Monograph 175, IEC 584 100 to 1820 212 to 3308 25 45 ± 0.75 ± 1.35 ±0.02% of span
Type E NIST Monograph 175, IEC 584 –50 to 1000 –58 to 1832 25 45 ± 0.20 ± 0.36 ±0.02% of span
Type J NIST Monograph 175, IEC 584 –180 to 760 –292 to 1400 25 45 ± 0.25 ± 0.45 ±0.02% of span
Type K
(7)
(7) Digital accuracy for NIST Type K is ±0.50 °C (±0.9 °F) from –180 to –90 °C (–292 to –130 °F).
NIST Monograph 175, IEC 584 –180 to 1372 –292 to 2502 25 45 ± 0.25 ± 0.45 ±0.02% of span
Type N NIST Monograph 175, IEC 584 –200 to 1300 –328 to 2372 25 45 ± 0.40 ± 0.72 ±0.02% of span
Type R NIST Monograph 175, IEC 584 0 to 1768 32 to 3214 25 45 ± 0.60 ± 1.08 ±0.02% of span
Type S NIST Monograph 175, IEC 584 0 to 1768 32 to 3214 25 45 ± 0.50 ± 0.90 ±0.02% of span
Type T NIST Monograph 175, IEC 584 –200 to 400 –328 to 752 25 45 ± 0.25 ± 0.45 ±0.02% of span
DIN Type L DIN 43710 –200 to 900 –328 to 1652 25 45 ± 0.35 ± 0.63 ±0.02% of span
DIN Type U DIN 43710 –200 to 600 –328 to 1112 25 45 ± 0.35 ± 0.63 ±0.02% of span
Type W5Re/
W26Re
ASTM E 988-96 0 to 2000 32 to 3632 25 45 ± 0.70 ± 1.26 ±0.02% of span
Millivolt Input –10 to 100 mV 3 mV ±0.015 mV ±0.02% of span
2-, 3-, 4-wire Ohm Input 0 to 2000 ohms 20 ohm ±0.35 ohm ±0.02% of span