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The KJ3221X1-BA2 8-channel 4–20 mA HART AO module from Emerson drives modulating field devices inside DeltaV control systems. This module converts controller commands into precise current outputs across eight channels. Engineers select this module when they need accurate analog control and access to HART device data.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | KJ3221X1-BA2 |
| Module Type | 8-Channel 4–20 mA HART AO Module |
| Output Type | 4–20 mA current loop with HART overlay |
| Interface | Backplane connector, field wiring terminals |
| Mounting | DeltaV chassis slot |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | Approx. 0.29 kg |
| Dimensions | Approx. 165 mm × 100 mm × 30 mm |
| Energy Storage | On-board capacitors for output smoothing |
| Component Count | 8 output channels per module |
Interface and Signal Details
The KJ3221X1-BA2 connects field wiring to the chassis backplane through a dedicated connector. Screw terminals secure outgoing conductors and resist vibration during continuous plant operation. Therefore, technicians achieve firm terminations without soldering or adapter kits. The module occupies one chassis slot and draws power from the shared rail.
Physical and Environmental Parameters
The module measures roughly 165 mm by 100 mm by 30 mm and weighs about 0.29 kg. Its compact housing fits crowded cabinets and keeps panel layout efficient. Meanwhile, the 0°C to 60°C operating range covers typical control room conditions. The on-board smoothing circuitry steadies output levels before signals reach field devices.
Why This Module Matters
Plant teams value the KJ3221X1-BA2 for its stable output and HART diagnostics. The energy storage components suppress ripple during load changes. As a result, control loops stay tight and valve hunting drops noticeably. Technicians also appreciate the clear channel labeling and quick slot access.