Product Overview
When you need precise measurement of analog signals in harsh industrial environments, the ABB AI820 Analog Input Module delivers reliable performance. Part of the ABB S800 series, this module offers 4 differential, bipolar current/voltage inputs. Each channel accepts either voltage or current signals, providing flexibility for various sensors and transmitters.
Technical Specifications Breakdown
The AI820 provides 4 channels supporting -20...+20 mA, 0...20 mA, 4...20 mA, -10...+10 V, 0...10 V, 2...10 V, -5...+5 V, 0...5 V, and 1...5 V d.c. bipolar differential inputs. With 14-bit resolution plus sign, it captures fine signal variations. Input impedance is 200 kΩ ± 25% in voltage mode (common mode) and 800 kΩ ± 25% in voltage mode (normal mode), while current inputs use a 250 Ω shunt resistor. The module achieves a maximum error of 0.1% and temperature drift of 70 ppm/°C for voltage and 50 ppm/°C for current.
Industry Applications
In process control applications, the AI820 connects to 2-wire transmitters for pressure, temperature, or flow measurement. The module distributes external transmitter supply to each channel via extended MTUs, simplifying wiring. Its ability to withstand accidental 30 V d.c. connections on current inputs protects against wiring errors, reducing downtime.
Installation & Setup Guidance
Mount the AI820 on an S800 series MTU such as TU810V1, TU810, TU812, TU814, TU830, or TU833. Ensure the module bus provides 24 V power. For vertical mounting in compact MTU configurations, the maximum ambient temperature is 40 °C (104 °F). Use field cable lengths up to 600 meters (656 yards).
Maintenance & Reliability
The AI820 features front LEDs for fault, run, and warning status. Supervision covers internal power supply, module error, module warning, and channel error. Operating temperature range is 0 to +55 °C (+32 to +131 °F), with storage from -40 to +70 °C (-40 to +158 °F). The module meets IP20 protection class and is corrosion protected to ISA-S71.04 G3.
Compatibility & Integration
This module integrates with ABB S800 I/O systems via the ModuleBus. It is compatible with MTUs TU810, TU812, TU814, TU830, and TU833. The AI820 supports HART communication on inputs. Certifications include CE, UL, ATEX Zone 2, and marine approvals from ABS, BV, DNV, and LR.
Selection Guide & Purchasing Advice
Before ordering the ABB AI820 (article number 3BSE008544R1), verify your system's compatibility with the S800 series and required MTU. The module weighs 0.2 kg (0.44 lbs) and has dimensions 45 mm width, 102 mm depth (111 mm with connector), and 119 mm height. Contact SpareTechPLC to confirm lifecycle status and availability.
Frequently Asked Questions
What signal types does the AI820 support?
The AI820 supports -20...+20 mA, 0...20 mA, 4...20 mA, -10...+10 V, 0...10 V, 2...10 V, -5...+5 V, 0...5 V, and 1...5 V d.c. bipolar differential inputs.
Can the AI820 handle accidental overvoltage?
Yes, current inputs can withstand an accidental maximum normal mode 30 V d.c. connection. The 250 Ω current sense resistors are rated at about 5 Watts for temporary protection.
What is the resolution of the AI820?
The module provides 14-bit resolution plus sign.
Is the AI820 isolated?
Yes, all 4 channels are groupwise isolated from ground with a dielectric test voltage of 500 V a.c.
What MTUs are compatible with the AI820?
Compatible MTUs include TU810, TU812, TU814, TU830, TU833, and TU810V1.
