Publication 1794-6.5.12 - November 1997
Appendix
A
Specifications
Specifications – 1794-IRT8 Thermocouple/RTD/mV Input Module
Number of Inputs 8 Channels (2 groups of 4)
Module Location Cat. No. 1794-TB3G, -TB3GS Terminal Base Unit
Nominal Ranges –40 to +100mV dc for thermocouples
0 to 500Ω for RTDs
Supported Thermocouple Types Type B: 300 to 1800°C (572 to 3272°F)
Type E: –270 to 1000°C (–454 to 1832°F)
Type J: –210 to 1200°C (–346 to 2192°F)
Type K: –270 to 1372°C (–454 to 2502°F)
Type L –200 to 800°C (–328 to 1472°F)
Type N: –270 to 1300°C (–454 to 2372°F)
Type R: –50 to 1768°C (–58 to 3214°F)
Type S: –50 to 1768°C (–58 to 3214°F)
Type T: –270 to 400°C (–454 to 752°F)
Supported RTD Types Resistance:
100 ohm Pt α = 0.00385 Euro (–200 to +870°C)
100 ohm Pt α = 0.003916 U.S. (–200 to +630°C)
200 ohm Pt α = 0.00385 Euro (–200 to +400°C)
200 ohm Pt α = 0.003916 U.S. (–200 to +400°C)
100 ohm Nickel α = 0.00618 (–60 to +250°C)
120 ohm Nickel α = 0.00672 (–80 to +320°C)
200 ohm Nickel α = 0.00618 (–60 to +200°C)
10 ohm Copper α = 0.00427 (–200 to +260°C)
Resolution 14 bits
Accuracy vs. filter Cutoff 0.2Hz = 0.05% of full range in millivolt mode
0.5Hz = 0.05% of full range in millivolt mode
1.0Hz = 0.05% of full range in millivolt mode
2.0Hz = 0.05% of full range in millivolt mode
4.0Hz = 0.05% of full range in millivolt mode
10.0Hz = 0.05% of full range in millivolt mode
40.0Hz = 0.05% of full range in millivolt mode
Hardware only = 0.10% of full range in millivolt mode
Data Format °C
°F
°K
–32767 to +32767
0-65535
0-5000 (ohms mode)
–4000 to +10000 (millivolt mode)
Common Mode Rejection –80db @ 5V peak-to-peak 50-60Hz
Common Mode Input Range ±4V minimum
Isolation Voltage 1500V ac (rms) or 2550V dc for 1.0s between customer and
system
Specifications continued on next page.
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