12P3903X012 Emerson DeltaV DCS Datasheet & Technical Manual
Manufacturer: Emerson
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Part Number: 12P3903X012
Condition：New with Original Package
Product Type: Analog Output Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Emerson 12P3903X012 DeltaV Analog Output Module
The Emerson 12P3903X012 serves as the primary 12P3903X012 Analog Output Module utilized to execute digital-to-analog signal modulation across Emerson DeltaV DCS platforms. Configured for precise final control element drive, the assembly converts internal digital register values into 8 independent, linearly scaled current loops, transmitting physical command signals directly to field valves, positioners, and modulating actuators.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 12P3903X012 |
| Brand | Emerson |
| Origin | United States |
| Weight | 0.18 kg |
| Dimensions | 51 mm x 102 mm x 102 mm |
| Operating Temp | -40 to 70 deg C |
| Power Consumption | LocalBus: 12 VDC at 150 mA; Bussed Field Power: 12 VDC at 300 mA |
| System Compatibility | Emerson DeltaV Distributed Control System (DCS) |
| Number of Channels | 8 isolated analog outputs |
| Signal Range | 4-20 mA current output |
| Resolution | 16-bit digital-to-analog conversion |
| Load Resistance | 0 to 750 Ohm per channel |
| Accuracy | Plus/minus 0.1% of span |
| Field Circuit Rating | 24 VDC at 32 mA |
| Isolation | Galvanic channel-to-channel and channel-to-ground isolation |
| Shock Resistance | 10 g half-sine wave for 11 ms duration |
| Vibration Resistance | 1 mm peak-to-peak (2 to 13.2 Hz); 0.7 g (13.2 to 150 Hz) |
| Airborne Contaminants | ISA-S71.04 Class G3 harsh corrosive rating |
| Protection Class | IP20 ingress protection |
| Hazardous Area Certifications | CE, UL, ATEX, IECEx (Zone 2 / Class I Division 2) |
4-20 mA HART Loop Protocol and Channel-to-Channel Isolation
The 12P3903X012 implements a 16-bit digital-to-analog converter architecture across all 8 available channels to assure fine signal granularity over the standard 4-20 mA HART loop protocol current profiles. Structural galvanic channel-to-channel isolation is integrated on every output loop circuit, isolating individual channels from each other and from the internal LocalBus ground plane. This independent circuit configuration limits the path of localized field faults, preventing external short circuits, common-mode voltage spikes, or electromagnetic noise on one field circuit loop from corrupting adjacent channels or destabilizing the control core.
Frequently Asked Questions
Q: What are the restrictive load resistance thresholds enforced by this module?
A: Each output channel is rated to drive a total loop loop resistance spanning 0 to 750 Ohm. Exceeding the 750 Ohm load ceiling prevents the 24 VDC internal field circuit supply from generating the full 20 mA maximum output span, causing saturation faults and non-linear command execution.
Q: How does the internal isolation circuit handle field ground potential differences?
A: The integrated channel-to-channel and channel-to-ground galvanic isolation completely severs the direct electrical path between the instrumentation loops and the rack chassis. This design isolates common-mode voltage differences present across distributed field locations, maintaining an overall signal accuracy of plus/minus 0.1% of span.
Field Installation Guidelines
- Carrier Insertion Profile: Align the module side guides with the designated slot positions on the DeltaV carrier card. Press the unit downward perpendicular to the backplane plane until the mechanical retention tabs snap into locked engagement.
- Shield Grounding Disconnects: Land the shield drain wires of all 4-20 mA current cables at the central enclosure grounding bus bar. Ensure shields remain ungrounded at the field instrument side to prevent the generation of circulating ground currents.
- Signal Line Routing Isolation: Route all analog output pairs through dedicated low-voltage wiring trays, maintaining structured separation from high-capacity AC supply lines and inductive switching elements to prevent electromagnetic signal coupling.
- Enclosure Environmental Controls: Verify that the continuous internal cabinet ambient environment does not transition outside the -40 to 70 deg C thermal boundaries. Obstruction of natural convection air currents will trigger premature aging of the internal microelectronics.