Rockwell-automation 1746-NR4 SLC RTD/Resistance Input Module User Manu Manual de usuario descargar pdf (Pagina 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)

1 2 ... 115 116 117 118 119 120 121 122 123 124 125 ... 147 148

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