Digital guide
You are here:
B&R 3IF772.9
Product Type: 8-Channel Thermocouple Input Module with Cold Junction Compensation
Product Description:
The B&R 3IF772.9 is an 8-channel thermocouple input module from the B&R X20 distributed I/O system. It directly accepts signals from all standard thermocouple types (B, E, J, K, N, R, S, T) with integrated cold junction compensation (CJC), eliminating the need for external signal conditioners.
Detailed content
Technical Specifications:
- Number of Channels: 8 thermocouple inputs
- Supported Thermocouple Types: Type B, Type E, Type J, Type K, Type N, Type R, Type S, Type T
- Resolution: 16-bit A/D converter
- Measurement Range (Type K): -270 °C to +1,372 °C
- Measurement Range (Type J): -210 °C to +1,200 °C
- Measurement Range (Type T): -270 °C to +400 °C
- Accuracy (Type K): ±1.5 °C or ±0.4% of reading (whichever is greater) at 0 °C to +500 °C
- Cold Junction Compensation (CJC): Integrated, accuracy ±0.5 °C
- Sampling Rate: Up to 10 Hz per channel (all channels)
- Isolation: Channel-to-channel isolation, 500 V DC; field-side to logic-side isolation, 500 V DC
- Bus System: X20 System Bus
- Power Supply: 24 V DC via X20 bus connector
- Power Consumption: ≤ 2 W
- Operating Temperature: -25 °C to +70 °C
- Protection Rating: IP20 (with X20 base/coupler)
- Dimensions (W × H × D): 25 mm × 90 mm × 75 mm
- Weight: Approximately 110 g
Functional Features:
- Thermocouple type selection per channel via Automation Studio
- Linearization tables for all standard thermocouple types stored in module firmware
- CJC sensor: Integrated precision temperature sensor (NTC) on terminal block
- Open-thermocouple detection (wire-break alarm)
- Diagnostic LEDs per channel
- Software filtering: Moving average, median filter configurable
Structural Characteristics:
- PA66-GF30 plastic housing, UL94 V-0
- Thermocouple-specific terminal blocks (miniature thermocouple connectors, IEC 60584 compliant)
- CJC sensor mounted at terminal block for accurate reference junction
- DIN rail TS 35 mounting
Material Composition:
- Housing: Glass-fiber reinforced polyamide (PA66-GF30)
- Terminal blocks: Nickel-plated brass (thermocouple grade)
- PCB: FR-4, conformally coated
- CJC Sensor: NTC thermistor, 10 kΩ at 25 °C
Applicable Industries:
- Plastics processing (extruders, injection molding)
- Glass manufacturing (furnaces, annealing)
- Metal heat treatment (furnaces, quenching)
- Food processing (ovens, sterilizers)
- Ceramics and kilns
Installation Requirements:
- Mount on X20 Base (3EX280.60-1) or X20 Coupler (3EX290.60-1)
- Use thermocouple extension wire of matching type (Type K wire for Type K TC)
- Maximum cable length: 10 m (uncompensated), 100 m with compensating cable
- CJC sensor must remain at ambient temperature — do not insulate or heat it
