AO890 ABB Brand New S800 IO Hazardous Area Control Unit
Manufacturer: ABB
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Part Number: AO890 3BSC690072R1
Condition：New with Original Package
Product Type: Intrinsically Safe IO Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The ABB AO890 (Part Number: 3BSC690072R1) operates as an 8-channel intrinsically safe analog output module within the distributed S800 I/O hardware platform. This specialized control component delivers standard 0 to 20 mA or 4 to 20 mA current loop signals to drive field devices positioned inside explosive or hazardous atmospheres. By embedding built-in intrinsic safety (IS) barriers on each individual channel, the module eliminates the requirement for bulky, expensive external safety isolation hardware. We provide this equipment exclusively as a 100% brand new, authentic factory product originating from ABB Switzerland, ensuring total compliance with global explosion-proof manufacturing regulations.
Technical Specifications
| Technical Parameter | Specification Data Value |
| Manufacturer | ABB |
| Model Number | AO890 |
| Catalog Code | 3BSC690072R1 |
| Channel Count | 8 analog output channels |
| Output Signal Range | 0 to 20 mA or 4 to 20 mA |
| Maximum Current Limit | 22 mA under overload states |
| Load Resistance Capacity | Less than or equal to 725 Ohm at 20 mA |
| Digital Resolution | 12-bit binary |
| Electrical Isolation | Groupwise isolated from ground loop circuits |
| Hazardous Area Certification | ATEX/IECEx Zone 2 to Zone 0 interface, cFMus Class I Division 2 |
| Diagnostics Indicators | Front panel LEDs for Fault, Run, Warning, and Open-Sensor |
| Modulebus Power Draw (5V) | 80 mA |
| Modulebus Power Draw (24V) | 110 to 150 mA |
| External Power Requirement | 220 to 300 mA at 24V DC |
| Signal Rise Time | 1 ms (10 percent to 90 percent step change) |
| Maximum Temperature Drift | 100 ppm per degree Celsius |
| Ambient Operating Temperature | 0 to +55 degrees Celsius |
| Physical Dimensions | 45 x 102 x 119 mm |
| Net Weight | 0.2 to 0.3 kg |
Engineering Advantages
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Eliminating External IS Barriers to Save Cabinet Space: Built-in intrinsic safety current limiters on every channel enable direct connection to explosive field zones. This integrated design removes standard standalone isolation barriers from your control cabinet layout, decreasing enclosure footprints and reducing overall wiring terminal costs.
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Direct Two-Wire Termination via Compact MTUs: The AO890 mounts directly onto the TU890 or TU891 Module Termination Units (MTUs). This layout establishes native two-wire connection points directly to field positioners or I/P converters, dispensing with intermediate marshalling terminal blocks and simplifying loop tracing during field commissioning.
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Proactive Loop Health Diagnostics via Real-Time LEDs: Four high-visibility LEDs on the front face instantly communicate channel health status. System operators can immediately isolate an open-circuit field loop or loose sensor wire without connecting an external engineering laptop, lowering mean time to repair (MTTR) on critical valves.
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Precise Actuator Control for Harsh Processing Lines: The 12-bit digital-to-analog converter generates granular output current adjustments, allowing smooth positioning of control valves, dampers, and variable speed pneumatic actuators. Groupwise ground isolation blocks stray common-mode noise voltages from corrupting the process signal.
FAQs
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Is this AO890 module a 100% brand new component?
Yes. We guarantee this unit arrives in 100% brand new, pristine condition, complete with original manufacturer labels and factory packaging from ABB.
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Which Module Termination Unit (MTU) should I select for a hazardous zone installation?
You must select the TU890 Compact MTU for explosive and intrinsically safe (Ex) applications. Use the alternative TU891 MTU only for non-hazardous (non-Ex) control loops.
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What happens if a field valve positioner fails and creates a short circuit?
The module incorporates an automatic output overload clamp that restricts maximum current flow to 22 mA. This protection profile prevents thermal damage to the internal electronics and preserves the intrinsic safety energy limits of the loop.
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Can I replace this module while the rest of the S800 I/O rack is operating?
Yes. When paired with a compatible S800 MTU baseline configuration, the hardware allows live replacement. You can pull a module and insert a brand new replacement unit without disconnecting power to the main Modulebus cluster.