Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 55)

Publication 1746-UM008B-EN-P - December 2006
Preliminary Operating Considerations 55
Effective Resolution
The effective resolution for an input channel depends upon the filter
frequency selected for that channel. This table displays the effective
resolution for the various input types and filter frequencies.
Effective Resolution
Input Type Filter Frequency
10 Hz 50 Hz 60 Hz 250 Hz
100 Ω Pt RTD (385) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.4 °C
(±0.7 °F)
200 Ω Pt RTD (385) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.4 °C
(±0.7 °F)
500
Ω Pt RTD (385) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F) ±0.4 °C
(±0.7 °F)
1000 Ω Pt RTD (385) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.4 °C
(±0.7 °F)
100 Ω Pt RTD (3916) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F)
200
Ω Pt RTD (3916) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F) ±0.3 °C
(±0.5 °F)
500 Ω Pt RTD (3916) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F)
1000 Ω Pt RTD (3916) (1) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F)
10
Ω Cu RTD (426) (1)(2) ±0.2 °C
(±0.4 °F) ±0.3 °C
(±0.5 °F) ±0.3 °C
(±0.5 °F) ±0.4 °C
(±0.7 °F)
120 Ω Ni RTD (618) (1)(3) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F)
120
Ω Ni RTD (672) (1) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.3 °C
(±0.5 °F)
604
Ω NiFe RTD (518) (1) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.1 °C
(±0.2 °F) ±0.2 °C
(±0.4 °F)
150 Ω Resistance Input ±0.02 Ω ±0.04 Ω ±0.04 Ω ±0.08 Ω
500
Ω Resistance Input
±0.1
Ω
±0.2
Ω
±0.2
Ω
±0.4
Ω
1000
Ω Resistance Input ±0.2 Ω
±0.3
Ω
±0.3
Ω
±0.5
Ω
3000
Ω Resistance Input ±0.2 Ω
±0.3
Ω
±0.3
Ω
±0.5
Ω
(1)
The digits following the RTD type represent the temperature coefficient of resistance (µ), which is defined as the resistance change per ohm per °C. For instance,
Platinum 385 refers to a platinum RTD with µ = 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.