Emerson Rosemount X-well 648, Reference Manual

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Specifications and Reference Data
Specifications and Reference Data
July 2016
Reference Manual
00809-0200-4648, Rev BB
Transmitters can be installed in locations where the ambient temperature is between –40 and 85 °C (–40 and 185 °F). In
order to maintain excellent accuracy performance, each transmitter is individually characterized over this ambient
temperature range at the factory.
A.1.6 Process temperature effects
Temperature effects example
When using a Pt 100 (

= 0.00385) sensor input at 30 °C
ambient temperature:

Digital Temperature Effects: 0.009 °C
⫻
(30 - 20) = 0.09 °C

Worst Case Error: D Digital Temperature Effects =
0.45 °C + 0.09 °C = 0.54 °C

Total Probable Error:
Rosemount X-well
™
temperature effects example
When using Rosemount X-well Technology at 30 °C ambient
temperature and 100 °C process temperature:

Digital Ambient Temperature Effects:
0.0058 °C
⫻
(30 - 20) = .058 °C

Process Temperature Effects: 0.01 °C
⫻
(100 - 30) = .70 °C

Worst Case Error: Digital Ac Digital Ambient
Temperature E Process Temperature Effects =
0.29 °C + 0.058 °C+ 0.70 °C = 1.05 °C

Total Probable Error:
= 0.76 °C
DIN Type L DIN 43710
0.0081 °C + (0.000435% of T) T

0 °C
0.0081 °C +(0.00375% of absolute value T) T < 0 °C
DIN Type U DIN 43710
0.0096 °C T

0 °C
0.0096 °C +(0.00645% of absolute value T) T < 0 °C
Type W5Re/W26Re ASTM E 988-96
0.024 °C T

200 °C
0.0345 °C – (0.0108% of T) T < 200 °C
GOST L
GOST R.
8.585-2001
0.0105 °C T

0 °C
0.0105 °C + (0.0045% of absolute value T) T < 0 °C
Other input types
Millivolt Input 0.0008 mV Entire Sensor Input Range
2-, 3-, 4-wire Ohm Input 0.0126

Entire Sensor Input Range
1. Change in ambient is with reference to the calibration temperature of the transmitter (20 °C [68 °C]) from factory.
2. Ambient temperature effect specification valid over minimum temperature span of 28 °C.
Table A-4. Ambient and Process Temperature Difference Effect on Digital Accuracy
Sensor option Sensor reference
Effects per 1.0 °C
(1.8 °F) difference in
Ambient and process
temperature
(1)
1. Valid under steady state and process ambient conditions.
Input temperature (T)
Rosemount X-well Pt 100
(
α
= 0.00385)
IEC 751 ± 0.01 °C (0.018 °F) Entire Sensor Input Range
Table A-3. Ambient Temperature Effect on Digital Accuracy
Sensor options Sensor reference
Effects per 1.0 °C (1.8 °F) change in
ambient temperature
(1)(2)
Input temperature (T)
0.45
2
0.09
2
+ 0.46 =
0.29
2
0.058
2
0.70
2
+ +