FOXBORO P0926MX – Signal Splitter / Isolator | I/A Series DCS Platform
Engineering Background
The Foxboro I/A Series (Intelligent Automation Series) is one of the most widely deployed Distributed Control System platforms in the global process industry, with installations spanning refining, petrochemical, power generation, and specialty chemical facilities. Within this architecture, signal conditioning modules play a critical role in maintaining loop integrity, eliminating ground loops, and enabling multi-drop signal distribution without degrading measurement accuracy. The P0926MX was engineered specifically to address these requirements within the I/A Series field wiring infrastructure.
Product Positioning
The FOXBORO P0926MX is a precision signal splitter/isolator module designed for 4–20 mA analog loops in I/A Series DCS environments. It accepts a single 4–20 mA input and provides two fully isolated, galvanically separated 4–20 mA output channels — enabling one field transmitter signal to be simultaneously distributed to the DCS controller, a safety system (SIS), historian, or third-party instrument without signal loading or ground loop interference. It is the preferred choice for procurement engineers requiring certified, OEM-sourced signal conditioning in Foxboro-based control architectures.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | P0926MX |
| Manufacturer | Schneider Electric / Foxboro (formerly Invensys) |
| Module Type | Signal Splitter / Galvanic Isolator |
| Input Signal | 4–20 mA (2-wire or 4-wire transmitter compatible) |
| Output Channels | 2 × isolated 4–20 mA outputs |
| Isolation Voltage | ≥ 500 V DC (channel-to-channel and channel-to-ground) |
| Accuracy | ±0.1% of full scale |
| Load Resistance (Output) | 0–600 Ω per channel |
| Power Supply | 24 V DC (loop-powered or external, per configuration) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH, non-condensing |
| Enclosure / Mounting | DIN rail mount, compact form factor |
| Certifications | CE, UL listed (verify current revision with datasheet) |
| Platform Compatibility | Foxboro I/A Series, SPEC 200, third-party 4–20 mA loops |
| Weight | Approx. 500 g (with packaging) |
Note: Specifications are based on Foxboro published datasheets. Always verify against the specific hardware revision in your system BOM.
Proven Application Environments
- Petroleum Refining: Distributing pressure and flow transmitter signals to both DCS and SIS (Safety Instrumented System) simultaneously, meeting SIL loop integrity requirements.
- Petrochemical Plants: Eliminating ground loops in long cable runs between field junction boxes and control room marshalling panels.
- Power Generation: Feeding boiler drum level signals to both the I/A Series controller and an independent historian/SCADA system.
- Pharmaceutical Manufacturing: Providing galvanic isolation in FDA-regulated processes where signal integrity and audit trail accuracy are mandatory.
- Pulp & Paper: Multi-drop signal distribution in high-noise electrical environments with variable-frequency drives (VFDs).
- LNG / Gas Processing: Hazardous area signal conditioning where ground potential differences between equipment skids create loop interference.
Engineering Advantages
- True Galvanic Isolation: Eliminates ground loops and common-mode noise — critical in large plant installations with multiple earthing points.
- Dual Independent Outputs: One transmitter feeds two independent systems (e.g., DCS + SIS) without signal loading or accuracy degradation.
- High Accuracy (±0.1% FS): Maintains measurement fidelity across the full 4–20 mA span — essential for custody transfer and regulatory reporting loops.
- DIN Rail Mounting: Compact, standardized installation in marshalling cabinets; minimizes panel space and simplifies wiring.
- OEM Foxboro Compatibility: Designed and validated for I/A Series architecture — no compatibility risk, no third-party integration uncertainty.
- Wide Temperature Range: Suitable for both air-conditioned control rooms and non-climate-controlled field enclosures.
- Low Maintenance: Solid-state design with no moving parts; MTBF exceeds typical plant maintenance intervals.
System Architecture & Signal Flow
In a typical I/A Series deployment, the P0926MX is installed in the marshalling cabinet between the field terminal block and the FBM (Field Bus Module) input card. Signal flow is as follows:
- Field Transmitter (e.g., pressure, flow, temperature) generates a 4–20 mA signal.
- Signal enters the P0926MX input terminal via shielded twisted-pair cable from the field junction box.
- Internal isolation circuitry galvanically separates the input from both output channels.
- Output Channel 1 feeds the Foxboro FBM analog input card (DCS control loop).
- Output Channel 2 feeds a secondary system — SIS logic solver, historian I/O card, or third-party SCADA input.
This architecture ensures that a fault or ground fault on the secondary system cannot propagate back to the primary DCS control loop, maintaining process control integrity.
Sourcing & Quality Verification
Konmask.com sources the FOXBORO P0926MX exclusively through verified industrial surplus channels and authorized distributor networks. Every unit undergoes the following pre-shipment verification protocol:
- Visual inspection: housing integrity, terminal condition, label legibility, and revision marking verification.
- Functional bench test: 4–20 mA input applied; both output channels measured for accuracy and isolation.
- Firmware/hardware revision documented and disclosed to buyer prior to shipment.
- Anti-static packaging with humidity indicator card for international shipments.
- Certificate of conformance (CoC) available upon request for regulated industries.
We do not source from unverified grey-market channels. All units are traceable to documented supply chain records.
Procurement Process
- Inquiry: Submit your RFQ via [email protected] or WhatsApp +0086 19859288691 with your required quantity, delivery timeline, and any revision/certification requirements.
- Quotation: We respond within 1 business day with pricing, lead time, and available stock confirmation.
- Order Confirmation: Purchase order accepted via email. Proforma invoice issued for payment processing.
- Payment: T/T (bank transfer), PayPal, or platform checkout. Net terms available for qualified accounts.
- Shipment: DHL / FedEx / UPS express with full tracking. Export documentation (commercial invoice, packing list, CoC) included.
- After-Sales: 90-day warranty on functionality. Technical support available for installation and commissioning queries.
Technical FAQ
Q: Can the P0926MX be used with HART-enabled transmitters?
A: The P0926MX passes the 4–20 mA analog signal. HART communication (superimposed FSK signal) compatibility depends on the specific revision — confirm with Konmask before ordering if HART transparency is required.
Q: Is the P0926MX suitable for SIL-rated safety loops?
A: The module provides galvanic isolation suitable for SIS input conditioning. For formal SIL certification of the complete loop, consult your functional safety engineer and verify the module’s SIL rating documentation.
Q: What is the difference between P0926MX and similar Foxboro splitter variants?
A: Foxboro offers several signal conditioning variants (P0926GX, P0926HX, etc.) differentiated by input type, output count, and power configuration. The P0926MX specifically provides dual 4–20 mA isolated outputs. Contact us to confirm the correct variant for your application.
Q: Can this module replace a failed unit in an existing I/A Series cabinet without reconfiguration?
A: In most cases, yes — the P0926MX is a passive/semi-passive signal conditioning module with no software configuration required. Verify hardware revision compatibility with your system integrator.
Q: Do you provide expedited shipping for urgent plant shutdowns?
A: Yes. Contact us directly via WhatsApp for same-day quotation and priority dispatch arrangements.
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