HONEYWELL 51301874-100 / 51301875-100 – Thermocouple Multiplexer Board | TDC 3000 / TotalPlant Series
Engineering Background
The Honeywell TDC 3000 and TotalPlant Distributed Control System (DCS) platform has been the backbone of process automation in refining, petrochemical, and power generation facilities for decades. The thermocouple multiplexer (mux) board is a critical signal-conditioning front-end that aggregates multiple thermocouple inputs into the DCS data highway, enabling high-density temperature monitoring with minimal field wiring overhead.
Product Positioning
The 51301874-100 (mux board assembly) paired with 51301875-100 (associated termination/daughter board) provides a proven, field-replaceable solution for plants maintaining or expanding legacy TDC 3000 infrastructure. Konmask.com sources these modules from decommissioned plant inventories and authorized surplus channels, offering procurement engineers a reliable alternative to long lead-time OEM orders.
Complete Technical Specifications
| Part Number (Primary) | 51301874-100 |
| Part Number (Secondary) | 51301875-100 |
| Manufacturer | Honeywell Process Solutions |
| Platform | TDC 3000 / TotalPlant DCS |
| Module Type | Thermocouple Multiplexer (Mux) Board |
| Function | Multi-channel thermocouple signal acquisition & multiplexing |
| Input Type | Thermocouple (TC) — Type J, K, T, E, R, S, B (platform-dependent) |
| Signal Conditioning | Cold junction compensation (CJC) on-board |
| Form Factor | PCB card assembly, rack-mount compatible |
| Weight | 350 g (approx.) |
| Operating Temperature | 0 °C to +60 °C (standard industrial range) |
| Compliance | CE, UL (per original OEM certification) |
| Condition | Refurbished / Surplus — tested prior to shipment |
Proven Application Environments
- Petroleum refining — crude distillation unit (CDU) temperature loops
- Petrochemical plants — reactor and heat-exchanger monitoring
- Power generation — boiler and turbine exhaust temperature arrays
- Pulp & paper — digester and dryer section temperature control
- Pharmaceutical — autoclave and clean-room HVAC monitoring
- Any facility running Honeywell TDC 3000 / TotalPlant DCS with existing TC mux infrastructure
Engineering Advantages
- High-density input: Multiplexed architecture reduces field cable runs and cabinet space versus discrete AI cards
- On-board CJC: Eliminates external cold-junction compensation hardware, simplifying panel design
- Drop-in replacement: Direct form/fit/function substitute for installed base — no firmware changes required
- Dual-part bundle: 51301874-100 + 51301875-100 shipped as a matched set, reducing integration risk
- Immediate availability: Surplus stock bypasses OEM lead times of 16–52 weeks
System Architecture & Signal Flow
Field thermocouple pairs terminate at the 51301875-100 termination board, which provides screw-terminal connectivity and passive CJC sensing. The 51301874-100 mux board receives the multiplexed analog signals, performs A/D conversion, and transmits engineering-unit data onto the TDC 3000 Local Control Network (LCN) or Data Hiway via the host controller backplane. The module operates under the supervision of the Honeywell Process Manager (PM) or High-Performance Process Manager (HPPM), and configuration is managed through Honeywell’s Control Builder or equivalent engineering workstation software.
Sourcing & Quality Verification
- Source: Decommissioned plant surplus and authorized industrial distributors
- Inspection: Visual inspection, board-level cleaning, and functional power-on test prior to listing
- Authenticity: OEM labels, revision markings, and serial numbers intact and verified
- Packaging: Anti-static bag + foam-lined carton; humidity indicator card included
- Warranty: 90-day return-to-base warranty against DOA or functional failure
Procurement Process
- Step 1 — Confirm compatibility: Verify your TDC 3000 system revision and PM/HPPM firmware version against Honeywell’s compatibility matrix
- Step 2 — Request quote: Contact support@konmask.com with your PO number, required quantity, and delivery timeline
- Step 3 — Order confirmation: Receive proforma invoice; payment via T/T, PayPal, or approved credit terms
- Step 4 — Shipment: DHL / FedEx express with full tracking; export documentation (commercial invoice, packing list, COO) provided
- Step 5 — Incoming inspection: Recommended 48-hour bench test before installation in live process
Technical FAQ
Q: Is the 51301874-100 compatible with the HPPM as well as the standard PM?
A: Yes. The mux board is compatible with both the Process Manager (PM) and High-Performance Process Manager (HPPM) within the TDC 3000 architecture, subject to system firmware revision. Please confirm your PM revision with our technical team before ordering.
Q: Can this board be used with non-thermocouple inputs (e.g., RTD or mV)?
A: No. The 51301874-100 is specifically designed for thermocouple inputs with on-board CJC. RTD inputs require a separate Honeywell RTD mux board (different part number).
Q: What is the channel count per board?
A: Channel count is determined by the host PM slot configuration. Refer to Honeywell document #51-52-25-66 (TDC 3000 I/O Module Reference) for the specific channel density for your system revision.
Q: Do you provide a test report or certificate of conformance (CoC)?
A: A functional test report is available upon request. CoC can be provided for orders of 3+ units. Contact support@konmask.com.
Q: What is the lead time for international orders?
A: In-stock units ship within 1–2 business days. International delivery via DHL Express typically takes 3–7 business days depending on destination and customs clearance.
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