Emerson KJ3002X1-BG2 12P1731X082 DeltaV Thermocouple Input Module

Technical Dossier

Product Details And Specifications

Emerson KJ3002X1 Series Technical Notes

The Emerson KJ3002X1 series is a family of thermocouple and analog input modules designed for the Emerson DeltaV distributed control system (DCS). These modules are deployed across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore oil and gas platforms, and large-scale chemical processing plants. The KJ3002X1 platform occupies a critical position in process automation infrastructure: it provides the primary interface between field-level thermocouple sensors and the DeltaV controller subsystem, enabling high-accuracy temperature measurement and closed-loop process control. Installed base counts for this series run into the tens of thousands of nodes worldwide, making long-term spare parts availability a primary operational concern for plant maintenance engineers and reliability teams.

The Evolution of KJ3002X1 Architecture

The KJ3002X1 series was introduced as part of the DeltaV S-series I/O subsystem, succeeding earlier analog input architectures that required dedicated signal conditioning hardware external to the controller cabinet. The KJ3002X1 integrates signal conditioning, cold junction compensation, and analog-to-digital conversion onto a single module footprint, reducing panel space requirements and wiring complexity. Early variants (BA1, BB1) supported a limited range of thermocouple types (J, K, T) with 8-channel density. Subsequent revisions expanded thermocouple type compatibility to include R, S, B, E, and N types, and introduced 12-channel configurations (BG1, BG2) to increase I/O density per carrier slot. The BG2 variant, including the specific assembly KJ3002X1-BG2 12P1731X082, represents a mature revision with enhanced noise immunity and improved cold junction compensation accuracy. Compatibility with DeltaV controller versions v7.x through v14.x has been validated; however, integration with DeltaV Live (v15+) requires firmware verification at the controller level. As the DeltaV platform has transitioned toward the Electronic Marshalling (CHARM) architecture, the KJ3002X1 series has entered a maintenance and lifecycle phase. Emerson no longer actively develops new hardware revisions for this series, but continues to provide firmware support. Plants operating legacy DeltaV S-series cabinets face a long-term sourcing challenge for these modules, as OEM production volumes have declined significantly.

KJ3002X1 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented KJ3002X1 series module range, organized by functional category. Each entry reflects a distinct hardware configuration or channel density variant.

Thermocouple Input Modules — 8-Channel:

• KJ3002X1-BA1: 8-channel thermocouple input, types J/K/T, standard accuracy, DeltaV S-series carrier mount
• KJ3002X1-BB1: 8-channel thermocouple input, extended type support (J/K/T/E/N), improved CJC circuit
• KJ3002X1-BC1: 8-channel thermocouple input, types J/K/T/R/S/B, high-temperature process variant
• KJ3002X1-BD1: 8-channel thermocouple input, intrinsically safe field wiring interface, ATEX/IECEx rated
• KJ3002X1-BK1: 8-channel thermocouple input, enhanced EMI shielding, suitable for high-noise electrical environments
• KJ3002X1-BK2: 8-channel thermocouple input, revision 2 PCB, improved analog front-end linearity

Thermocouple Input Modules — 12-Channel:

• KJ3002X1-BG1: 12-channel thermocouple input, types J/K/T/E/R/S/B/N, standard DeltaV S-series carrier
• KJ3002X1-BG2 12P1731X082: 12-channel thermocouple input, revision 2 assembly, enhanced CJC accuracy, noise-hardened analog stage — primary subject of this listing
• KJ3002X1-CA1: 12-channel thermocouple input, conformal-coated PCB for high-humidity environments
• KJ3002X1-CB1: 12-channel thermocouple input, extended temperature range operation (-40°C to +70°C ambient)
• KJ3002X1-CB2: 12-channel thermocouple input, revision 2 CB-series, updated firmware compatibility tag

Associated KJ3001X1 Analog Input Modules (RTD/mV — Same Carrier Family):

• KJ3001X1-BA1: 8-channel RTD/resistance input, 2/3/4-wire PT100/PT1000, DeltaV S-series carrier
• KJ3001X1-BB1: 8-channel RTD input, extended resistance range, improved linearization algorithm
• KJ3001X1-BC1: 8-channel RTD input, intrinsically safe field wiring, ATEX Zone 1 rated
• KJ3001X1-BD1: 8-channel millivolt input, direct mV signal measurement, 0–100 mV range
• KJ3001X1-BG1: 12-channel RTD input, high-density configuration, DeltaV S-series 12-slot carrier