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AEG AS-B875-002
- Product Introduction: AEG AS-B875-002 is a high-precision 4-channel thermocouple input module designed for the Modicon 800 series PLC systems, optimized for critical temperature measurement and control applications in industrial process control, manufacturing and instrumentation. The module features built-in high-accuracy cold junction compensation (CJC), advanced signal conditioning, wide thermocouple type support and full channel-to-channel isolation, delivering ultra-precise and stable temperature data even in high-noise industrial environments. It supports high-speed sampling and configurable digital filtering, and integrates seamlessly with the Modicon 800 series backplane bus, making it an ideal solution for critical temperature monitoring in pharmaceutical, semiconductor, chemical and food manufacturing applications requiring GMP/ISO-compliant precision measurements.
- Technical Specifications:
- Number of Input Channels: 4 fully isolated thermocouple input channels (channel-to-channel and channel-to-backplane)
- Supported Thermocouple Types: Software-configurable per channel – J, K, T, E, R, S, B, N (8 industrial standard types)
- Measurement Range: Dependent on thermocouple type – J (-210°C to +1250°C), K (-270°C to +1372°C), T (-270°C to +400°C), E (-270°C to +900°C), R (0°C to +1768°C), S (0°C to +1768°C), B (400°C to +1820°C), N (-200°C to +1300°C)
Detailed content
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- Measurement Accuracy: ±0.2°C (at 25°C, J/K/T/E), ±0.4°C (at 25°C, R/S/N), ±0.8°C (at 25°C, B) + 0.03% of reading
- Cold Junction Compensation (CJC): Built-in high-precision PT1000 RTD, ±0.1°C CJC accuracy, automatic real-time compensation
- Input Impedance: >20 MΩ (ultra-high impedance to minimize signal loading and loss)
- Isolation Voltage: 2500 V AC (channel-to-channel), 3000 V AC (channel-to-backplane bus)
- CMRR: >130 dB (@50/60 Hz) – ultra-high noise rejection for industrial electrical environments
- Sampling Rate: 20 samples per second (sps) per channel, simultaneous sampling for all channels
- Digital Filter: Software-configurable 2nd order filter (0.01s–30s time constant), selectable filter bypass for high-speed sampling
- Open Thermocouple Detection: Automatic per-channel open circuit detection, fault signaling to PLC CPU
- Backplane Communication: Modicon 800 series proprietary bus, <0.8 ms data transfer latency
- Power Supply: 24 V DC (from PLC chassis), power consumption <1.8 W
- Operating Temperature: -25°C to +70°C
- Storage Temperature: -40°C to +85°C
- Vibration Resistance: 5-50 Hz, 0.5 g acceleration (IEC 60068-2-6)
- Protection Class: IP20 (cabinet-mounted)
- Dimensions: 80 mm (W) × 160 mm (H) × 60 mm (D)
- Weight: 0.6 kg
- Compatibility: Modicon 800 series PLC chassis (AS-B800/810/820), Modicon 800 series remote I/O racks (AS-P890/AS-J892)
- Functional Features:
- 4 fully isolated channels with 2500 V AC channel-to-channel isolation eliminate ground loops and electrical interference, ensuring precise temperature measurements in high-noise industrial environments with VFDs, motors and welding equipment. Built-in PT1000 RTD-based CJC with ±0.1°C accuracy delivers ultra-precise cold junction compensation, eliminating the need for external CJC modules and ensuring accurate temperature readings for all thermocouple types. 16-bit high resolution and ultra-low measurement error provide GMP/ISO-compliant temperature data, critical for pharmaceutical, semiconductor and food manufacturing applications requiring strict process control. 20 sps simultaneous high-speed sampling enables real-time temperature monitoring of dynamic process changes (e.g., chemical reactions, thermal processing), with filter bypass for maximum sampling speed. Software-configurable 2nd order digital filtering balances measurement speed and stability, adapting to both fast dynamic processes and static temperature monitoring (e.g., storage tanks, pipelines). Automatic per-channel open thermocouple detection provides real-time fault signaling to the PLC CPU, enabling immediate alarm triggering and system safety actions to prevent process deviations. Ultra-high input impedance (>20 MΩ) minimizes signal loading and loss, ensuring accurate temperature measurements even with long thermocouple cable runs (100+ meters) in large industrial facilities. Software-configurable thermocouple type per channel allows mixed thermocouple usage in a single module, maximizing system flexibility and reducing hardware costs for multi-point temperature monitoring with different thermocouple types. Calibration-free design with on-board self-calibration circuitry maintains long-term measurement accuracy without manual adjustment, lowering maintenance costs and ensuring compliance with quality standards. Seamless integration with Modicon 800 series remote I/O racks enables distributed high-precision temperature monitoring, reducing cable runs to measurement points and improving signal integrity.
- Application Scenarios:
- Pharmaceutical manufacturing for high-precision temperature monitoring of reactors, fermenters, lyophilizers and sterilization equipment, complying with GMP and FDA regulations. Semiconductor and electronics manufacturing for ultra-precise thermal control of clean room equipment, wafer processing tools and semiconductor fabrication processes. Chemical and petrochemical processing for critical temperature monitoring of reactors, distillation columns and high-temperature reaction vessels, ensuring process safety and product quality. Food and beverage production for precision temperature control of pasteurization, baking, freezing and cold storage processes, complying with HACCP and food safety standards. Metalworking and machining for high-temperature measurement of furnaces, molds and welding equipment, with accurate monitoring of thermal processing conditions. Power generation for temperature monitoring of turbine bearings, generator windings and transformer oil, enabling preventative maintenance and avoiding equipment failure. Glass and ceramic manufacturing for high-temperature measurement of kilns and furnaces (up to 1820°C with B-type thermocouples), with stable readings in high-heat industrial environments. Water and wastewater treatment for temperature monitoring of digesters, heat exchangers and chemical treatment processes, with high noise rejection for industrial plant environments. Aerospace and automotive testing for thermal characterization of components under extreme temperature conditions, with high-precision and high-speed sampling.
