Table of Contents
Advertisement
Specifications and Reference Data
July 2016
Table A-3. Ambient Temperature Effect on Digital Accuracy
Sensor options
DIN Type L
DIN Type U
Type W5Re/W26Re
GOST L
Other input types
Millivolt Input
2-, 3-, 4-wire Ohm Input
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.
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
Table A-4. Ambient and Process Temperature Difference Effect on Digital Accuracy
Sensor option
Rosemount X-well Pt 100
(α = 0.00385)
1.
Valid under steady state and process ambient conditions.
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: Digital + Digital Temperature Effects =
0.45 °C + 0.09 °C = 0.54 °C
Total Probable Error:
2
2
0.45
+
0.09
=
0.46
Specifications and Reference Data
Effects per 1.0 °C (1.8 °F) change in
Sensor reference
ambient temperature
0.0081 °C + (0.000435% of T)
DIN 43710
0.0081 °C +(0.00375% of absolute value T)
0.0096 °C
DIN 43710
0.0096 °C +(0.00645% of absolute value T)
0.024 °C
ASTM E 988-96
0.0345 °C – (0.0108% of T)
0.0105 °C
GOST R.
8.585-2001
0.0105 °C + (0.0045% of absolute value T)
0.0008 mV
0.0126
Sensor reference
IEC 751
(1)(2)
Effects per 1.0 °C
(1.8 °F) difference in
Ambient and process
(1)
temperature
± 0.01 °C (0.018 °F)
™
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 Accuracy + Digital Ambient
Temperature Effects + Process Temperature Effects =
0.29 °C + 0.058 °C+ 0.70 °C = 1.05 °C
Total Probable Error:
2
2
+
+
0.29
0.058
Reference Manual
00809-0200-4648, Rev BB
Input temperature (T)
T 0 °C
T < 0 °C
T 0 °C
T < 0 °C
T 200 °C
T < 200 °C
T 0 °C
T < 0 °C
Entire Sensor Input Range
Entire Sensor Input Range
Input temperature (T)
Entire Sensor Input Range
2
= 0.76 °C
0.70
61
Advertisement
Table of Contents
