Emerson Rosemount Reference Manual page 203

Reference Manual
00809-0100-4021, Rev GC
Sensor options Sensor reference
Type S NIST Monograph
175, IEC 584
Type T NIST Monograph
175, IEC 584
DIN Type L DIN 43710
DIN Type U DIN 43710
Type ASTM E 988-96
W5Re/W26Re
GOST Type L GOST R
8.585-2001
Other input types
Millivolt Input
2-, 3-, 4-wire Ohm Input
(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.
(2) Digital accuracy: Digital output can be accessed by the Field Communicator.
(3) Enhanced accuracy can be ordered using the P8 Model Code.
(4) Total Analog accuracy is the sum of digital and D/A accuracies.
(5) Applies to HART / 4-20 mA devices.
(6) Total digital accuracy for thermocouple measurement: sum of digital accuracy +0.25 °C (0.45 °F) (cold junction accuracy).
(7) Digital accuracy for NIST Type B is ±3.0 °C (±5.4 °F) from 100 to 300 °C (212 to 572 °F).
(8) Digital accuracy for NIST Type K is ±0.50 °C (±0.9 °F) from –180 to –90 °C (–292 to –130 °F).
(9) No minimum or maximum span restrictions within the input ranges. Recommended minimum span will hold noise within accuracy specification with damping at zero
seconds.
(10) Digital accuracy: Digital output can be accessed by the Field Communicator.
(11) Enhanced accuracy can be ordered using the P8 Model Code.
(12) Total Analog accuracy is the sum of digital and D/A accuracies.
(13) Applies to HART / 4-20 mA devices.
Reference accuracy example (HART only)
When using a Pt 100 (= 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.
TotalSystemAccuracy
Differential capability exists between any two sensor types
(dual-sensor option)
For all differential configurations, the input range is X to Y where:


Digital accuracy for differential configurations (dual-sensor
option, HART only)


Reference data
Input ranges
0 to 1768 32 to 3214
–200 to 400 –328 to 752
–200 to 900 –328 to 1652
–200 to 600 –328 to 1112
0 to 2000 32 to 3632
–200 to 800 –328 to 1472
–10 to 100 mV
0 to 2000 ohms

TransmitterAccuracy
=
X = Sensor 1 minimum – Sensor 2 maximum and
Y = Sensor 1 maximum – Sensor 2 minimum.
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.
Appendix A: Reference Data
Minimum Digital
(9) (10)
span accuracy
25 45 ± 0.50 ± 0.90
25 45 ± 0.25 ± 0.45
25 45 ± 0.35 ± 0.63
25 45 ± 0.35 ± 0.63
25 45 ± 0.70 ± 1.26
25 45 ± 0.25 ± 0.45
3 mV ±0.015 mV
20 ohm ±0.35 ohm
 
2
SensorAccuracy
+
April 2014
Enhanced
accuracy D/A
(11) (12)(13)
accuracy
±0.02% of span
±0.02% of span
±0.02% of span
±0.02% of span
±0.02% of span
±0.02% of span
±0.02% of span
±0.02% of span

2
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