Rockwell Automation 1746-NR4 SLC 500 RTD/Resistance Input Module/ Instructions - Manual (Page 22)

22 SLC 500™ RTD/Resistance Input Module
Publication 1746-IN012B-EN-P - May 2001
RTD Accuracy and Temperature Drift Specifications
When you are using 100
Ω
or 200
Ω
platinum RTDs with 0.5 mA excitation current,
refer to the important note on the next page about module accuracy.
RTD Type Accuracy (4)
(0.5 mA
Excitation)
(4) The accuracy values assume that the module was calibrated within the specified temperature range of 0°C to 60°C
(32°F to 140°F).
Accuracy (4)
(2.0 mA
Excitation)
Temperature
Drift
(6)
(0.5 mA Excitation)
(6) Temperature drift specifications apply to a module that has not been calibrated.
Temperature
Drift
(6)
(2.0 mA Excitation)
Platinum
(385)
(1)
(1) The digits following the RTD type represent the temperature coefficient of resistance ( α ), which is defined as the resistance
change per ohm per °C. For instance, Platinum 385 refers to a platinum RTD with α = 0.00385 ohms/ohm - °C or simply
0.00385/°C.
100
Ω
± 1.0 °C
(±2.0 °F) ± 0.5 °C
(± 0.9 °F) ± 0.034 °C/°C
(± 0.061 °F/°F) ± 0.014 °C/°C
(± 0.025 °F/°F)
200
Ω
± 1.0 °C
(± 2.0 °F) ± 0.5 °C
(± 0.9 °F) ± 0.034 °C/°C
(± 0.061 °F/°F) ± 0.014 °C/°C
(± 0.025 °F/°F)
500 Ω ± 0.6 °C
(± 1.1 °F) ± 0.5 °C
(± 0.9 °F) ± 0.017 °C/°C
(± 0.031 °F/°F) ± 0.014 °C/°C
(± 0.025 °F/°F)
1000 Ω ± 0.6 °C
(± 1.1 °F) ± 0.5 °C
(± 0.9 °F) ± 0.017 °C/°C
(± 0.031 °F/°F) ± 0.014 °C/°C
(± 0.025 °F/°F)
Platinum
(3916)
(1)
100 Ω ± 1.0 °C
(± 2.0 °F) ± 0.4 °C
(± 0.7 °F) ± 0.034 °C/°C
(± 0.061 °F/°F) ± 0.011 °C/°C
(± 0.020 °F/°F)
200 Ω ± 1.0 °C
(±2.0 °F) ± 0.4 °C
(± 0.7 °F) ± 0.034 °C/°C
(± 0.061 °F/°F) ± 0.011 °C/°C
(± 0.020 °F/°F)
500
Ω
± 0.5 °C
(± 0.9 °F) ± 0.4 °C
(± 0.7 °F) ± 0.014 °C/°C
(± 0.025 °F/°F) ± 0.011 °C/°C
(± 0.020 °F/°F)
1000
Ω
± 0.5 °C
(± 0.9 °F) ± 0.4 °C
(± 0.7 °F) ± 0.014 °C/°C
(± 0.025 °F/°F) ± 0.011 °C/°C
(± 0.020 °F/°F)
Copper
(426)
(1)(2)
(2) Actual value at 0°C is 9.042 Ω per SAMA standard RC21-4-1966.
10
Ω
Not allowed.
(5)
(5) To maximize the relatively small RTD signal, only 2 mA excitation current is allowed.
± 0.6 °C
(± 1.1 °F) Not allowed.
(5) ± 0.017 °C/°C
(± 0.031 °F/°F)
Nickel
(618)
(1)(3)
(3) Actual value at 0°C is 100 Ω per DIN standard.
120
Ω
± 0.2 °C
(± 0.4 °F) ± 0.2 °C
(± 0.4 °F) ± 0.008 °C/°C
(± 0.014 °F/°F) ± 0.008 °C/°C
(± 0.014 °F/°F)
Nickel
(672)
(1)
120
Ω
± 0.2 °C
(± 0.4 °F) ± 0.2 °C
(± 0.4 °F) ± 0.008 °C/°C
(± 0.014 °F/°F) ± 0.008 °C/°C
(± 0.014 °F/°F)
Nickel Iron
(518)
(1)
604 Ω ± 0.3 °C
(± 0.5 °F) ± 0.3 °C
(± 0.5 °F) ± 0.010 °C/°C
(± 0.018 °F/°F) ± 0.010 °C/°C
(± 0.018 °F/°F)