ABB AI835A Thermocouple/Millivolt Input Module
Description
ABB AI835A Thermocouple/Millivolt Input Module is an industrial-grade analog input module designed for precise thermocouple and millivolt signal measurement, featuring 8 differential input channels for use in automated industrial systems.
| Specification | Value |
|---|---|
| Number of Input Channels | 8 differential channels |
| Measurable Signal Types | Thermocouple (types B, C, D, E, J, K, L, N, R, S, T, U), millivolt signals |
| Millivolt Measurement Range | -30 mV to +75 mV linear |
| A/D Resolution | 15 bits |
| Input Impedance | > 1 MΩ |
| Common Mode Rejection Ratio (CMRR) | 120 dB (50/60 Hz) |
| Maximum Field Cable Length | 600 meters |
| Operating Temperature | -20 to 60 degrees Celsius |
| Power Input | Dual redundant DC 9 – 36 V (typical 24 V) |
| Communication Interface | Profibus DP, 9.6 kBit/s to 12 MBit/s |
| Mounting | Standard 35 mm industrial rail |
Key Features:
- Channel 8 configurable as cold junction (CJ) temperature measurement channel using 4-wire Pt100 RTD, with flexible CJ temperature acquisition options including local measurement, remote measurement, user parameter setting, or application-based setting
- Built-in open-circuit (broken wire) detection for real-time input signal integrity monitoring
- High noise immunity with >60 dB NMR suppression (50/60 Hz) and 1500 V DC power isolation
- Comprehensive protection including reverse polarity protection, 4000 V surge protection, 1.5 A overcurrent protection, and 600 W surge protection
- Linearization and filtering functions for accurate, noise-reduced signal readings
- Channel-to-channel electrical isolation for enhanced reliability
Applications:
- High temperature measurement in industrial furnaces, boilers, heat treatment processes, power generation, chemical plants, and oil and gas facilities
- Process control for temperature-critical manufacturing operations to ensure product quality
- Condition monitoring of equipment in energy, automotive, and food processing industries
- Environmental monitoring systems for water treatment and air purification equipment
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