Owner's manual

14 Rockwell Automation Publication 1769-UM005B-EN-P - March 2012
Chapter 1 Overview
The table below provide specifications for RTD accuracy and temperature
drift. The ratings apply when a 50/60 Hz filter is used.
Table 2 - RTD Accuracy and Temperature Drift
RTD Type Maximum Scaled Accuracy
(25 °C with Calibration)
Maximum Scaled Accuracy
(0…60 °C with Calibration)
Maximum Temperature Drift
(from 25 °C without
Calibration)
Copper 426 10 Ω ±0.8 °C (1.44 °F) ±1.1 °C (1.98 °F) ±0.032 °C/°C (0.032 °F/°F)
Nickel 618 120 Ω ±0.3 °C (±0.54 °F) ±0.5 °C (±0.9 °F) ±0.012 °C/°C (±0.012 °F/°F)
Nickel 672 120 Ω ±0.3 °C (±0.54 °F) ±0.5 °C (±0.9 °F) ±0.012 °C/°C (±0.012 °F/°F)
Nickel-Iron 518 604 Ω ±0.3 °C (±0.54 °F) ±0.5 °C (±0.9 °F) ±0.015 °C/°C (±0.015 °F/°F)
Platinum 385 100 Ω ±0.5 °C (±0.9 °F) ±0.9 °C (±1.62 °F) ±0.026 °C/°C (±0.026 °F/°F)
200 Ω ±0.5 °C (±0.9 °F) ±0.9 °C (±1.62 °F) ±0.026 °C/°C (±0.026 °F/°F)
500 Ω ±0.5 °C (±0.9 °F) ±0.9 °C (±1.62 °F) ±0.026 °C/°C (±0.026 °F/°F)
1000 Ω ±0.5 °C (±0.9 °F) ±0.9 °C (±1.62 °F) ±0.026 °C/°C (±0.026 °F/°F)
Platinum 3916 100 Ω ±0.4 °C (±0.72 °F) ±0.8 °C (±1.44 °F) ±0.023 °C/°C (±0.023 °F/°F)
200 Ω ±0.4 °C (±0.72 °F) ±0.8 °C (±1.44 °F) ±0.023 °C/°C (±0.023 °F/°F)
500 Ω ±0.4 °C (±0.72 °F) ±0.8 °C (±1.44 °F) ±0.023 °C/°C (±0.023 °F/°F)
1000 Ω ±0.4 °C (±0.72 °F) ±0.8 °C (±1.44 °F) ±0.023 °C/°C (±0.023 °F/°F)
IMPORTANT
When you are using any platinum (385) RTDs with 0.5 mA excitation current, the
module’s accuracy is:
· ±0.5 °C (0.9 °F) after you apply power to the module or perform an
autocalibration at 25 °C (77 °F) ambient, with module operating temperature at
25 °C (77 °F).
· ±[0.5 °C (0.9 °F) + DT ± 0.026 deg./°C (±0.026 deg./°F)] after you apply power
to the module or perform an autocalibration at 25 °C (77 °F) ambient, with
module operating temperature between 0…60 °C (140 °F). DT is the temperature
difference between the actual module operating temperature and 25°C (77 °F).
The value 0.026 deg./°C (±0.026 deg./°F) is the temperature drift shown in the
table above.
· ±0.9 °C after you apply power to the module or perform an autocalibration at
60 °C (140 °F) ambient, with module operating temperature at 60 °C (140 °F).