Flex 8 Point Thermocouple RTD Module

Model Numbers: 1794-IRT8

Inputs:

• 8 channels (2 groups of 4)

Supported Thermocouple Types and Ranges:

• B: 300…1800 °C (572…3272 °F)
• E: -270…1000 °C (-454…1832 °F)
• J: -210…1200 °C (-346…2192 °F)
• K: -270…1372 °C (-454…2502 °F)
• TXK/XK(L): -200…800 °C (-328…1472 °F)
• N: -270…1300 °C (-454…2372 °F)
• R, S: -50…1768 °C (-58…3214 °F)
• T: -270…400 °C (-454…752 °F)

Supported RTD Types and Ranges:

• 100 Ω Pt α = 0.00385 Euro: -200…870 °C (-328…1598 °F)
• 200 Ω Pt α = 0.00385 Euro: -200…400 °C (-328…752 °F)
• 100 Ω Pt α = 0.003916 U.S.: -200…630 °C (-328…1166 °F)
• 100 Ω Nickel: -60…250 °C (-76…482 °F)
• 200 Ω Nickel: -60…200 °C (-76…362 °F)
• 120 Ω Nickel: -80…320 °C (-112…608 °F)
• 10 Ω Copper: -200…260 °C (-328…470 °F)

Nominal Input Voltage Ranges:

• Thermocouples: -40…100 mV DC
• RTDs: 0…325 mV

Resolution: 14 bits

Cold Junction Compensation Range: -20…100 °C

Flexbus Current: 40 mA

Power Dissipation: 3.0 W max @ 31.2V DC

Thermal Dissipation: Max 10.2 BTU/hr @ 31.2V DC

Environmental Specifications:

• Operating Temperature:
  • 1794-IRT8, 1794-IRT8K: -20…55 °C (-4…131 °F)
  • 1794-IRT8XT: -20…70 °C (-4…158 °F)
• Non-operating Temperature: -40…85 °C (-40…185 °F)
• Relative Humidity: 5…95% non-condensing
• Vibration: 5 g @ 10…500 Hz
• Shock: 30 g (operating), 50 g (non-operating)

Technical Specifications:

• Isolation Voltage: 50V (continuous), Basic Insulation Type

• Common Mode Rejection: -80 dB @ 5V peak-to-peak, 50…60 Hz

• Common Mode Input Range: +15V min

• System Throughput (8 channels scanned):

  • 7.4 ms: Millivolt
  • 8.0 ms: Ω - 2-wire RTD
  • 10.0 ms: Ω - 3-wire RTD
  • 10.4 ms: Ω - 4-wire RTD
  • 8.0 ms: 2-wire RTD (°F)
  • 10.4 ms: 4-wire RTD (°F)
  • 8.8 ms: 2-wire RTD (°C), (°K)
  • 10.8 ms: 4-wire RTD (°C), (°K)
  • 9.8 ms: 3-wire RTD (°F)
  • 10.0 ms: 3-wire RTD (°C), (°K)
  • 9.0 ms: Thermocouples (°F)
  • 9.4 ms: Thermocouples (°C), (°K)

• Open Circuit Protection:

  • RTD mode: Module defaults to max value on open input
  • TC mode: Module defaults to min value on open input

• Overvoltage Capability: 15V DC continuous at 25 °C

• Overall Drift with Temperature: 50 ppm/°C of span (max)

Weight: Approximately 0.36 kg