Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 13)

Publication 1746-UM008B-EN-P - December 2006
Overview 13
RTD Compatibility
The following table lists the RTD types you can use with the RTD
module and gives each type’s associated temperature range,
resolution, and repeatability specifications.
RTD Unit Temperature Ranges, Resolution and Repeatability
RTD Unit Type Temperature Range
(0.5 mA excitation)
(1)
Temperature Range
(2.0 mA excitation)
(1)
Resolution Repeatability
Platinum (385)
(2)
100
Ω
-200…850 °C
(-328…1562 °F)
-200…850 °C
(-328…1562 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
200 Ω -200…850 °C
(-328…1562 °F)
-200…850 °C
(-328…1562 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
500
Ω
-200…850 °C
(-328…1562 °F)
-200…850 °C
(-328…1562 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
1000 Ω -200…850 °C
(-328…1562 °F)
-200…240 °C
(-328…464 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
Platinum (3916)
(2)
100
Ω
-200…630 °C
(-328…1166 °F)
-200 …630 °C
(-328…1166 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
200 Ω -200…630 °C
(-328…1166 °F)
-200…630 °C
(-328…1166 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
500
Ω
-200…630 °C
(-328…1166 °F)
-200…630 °C
(-328 …1166 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
1000 Ω -200…630 °C
(-328…1166 °F)
-200…630 °C
(-328…446 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
Copper (426)
(2)(3) 10
Ω
Not allowed
(4) -100…260 °C
(-148…500 °F)
0.1 °C
(0.2 °F)
±0.2 °C
(±0.4 °F)
Nickel (618)
(2)(5) 120
Ω
-100…260 °C
(-148 …500 °F)
-100…260 °C
(-148…500 °F)
0.1 °C
(0.2 °F)
±0.1 °C
(±0.2 °F)
Nickel (672)
(2) 120 Ω -80 …260 °C
(-112 …500 °F)
-80 …260 °C
(-112 …500 °F
0.1 °C
(0.2 °F)
±0.1 °C
(±0.2 °F)
Nickel Iron (518)
(2) 604
Ω
-100…200 °C
(-148…392 °F)
-100…200 °C
(-148…392 °F)
0.1 °C
(0.2 °F)
±0.1 °C
(±0.2 °F)
(1) The temperature range for the 1000 Ω RTD is dependant on the excitation current.
(2) 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 Ω/Ω -°C or simply 0.00385 /°C.
(3) Actual value at 0 °C (32 °F) is 9.042 Ω per SAMA standard RC21-4-1966.
(4)
To maximize the relatively small RTD unit signal, only 2 mA excitation current is allowed.
(5) Actual value at 0 °C (32 °F) is 100 Ω per DIN standard.