Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 120)

Publication 1746-UM008B-EN-P - December 2006
120 Specifications
Nickel (618)
(1)(3)
120
Ω
-100…260 °C
(-148…500 °F) -100 …260 °C
(-148…500 °F) 0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
Nickel (672)
(1)
120 Ω -80 …260 °C
(-112…500 °F) -80 …260 °C
(-112 …500 °F) 0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
Nickel Iron (518)
(1)
604
Ω
-100 …200 °C
(-148 …392 °F) -100 …200 °C
(-148 …392 °F) 0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
(1) The digits following the RTD type represent the temperature coefficient of resistance ( ∝), which is defined as the resistance change per ohm per °C.
For instance, Platinum 385 refers to a platinum RTD with ∝ = 0.00385 ohms/ohm -°C or simply 0.00385 /°C.
(2) Actual value at 0 °C (32 °F) is 9.042 Ω per SAMA standard RC21-4-1966.
(3) Actual value at 0 °C (32 °F) is 100 Ω per DIN standard.
(4)
The temperature range for the 1000 Ω RTD is dependant on the excitation current.
(5) To maximize the relatively small RTD signal, only 2 mA excitation current is allowed.
RTD Temperature Ranges, Resolution, and Repeatability
RTD Type
Temp. Range
(0.5 mA Excitation)
(4)
Temp. Range
(2.0 mA Excitation)
(4)
Resolution Repeatability
IMPORTANT
The exact signal range valid for each input type is dependent
upon the excitation current magnitude that you select when
configuring the module.
For details on excitation current, refer to page 119.
RTD Accuracy and Temperature Drift Specification
RTD Type
Accuracy
(0.5 mA Excitation)
(4)
Accuracy
(2.0 mA Excitation)
(4)
Temperature Drift
(0.5 mA Excitation)
(6)
Temperature Drift
(2.0 mA Excitation)
(6)
Platinum (385)
(1)
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)