Product Overview

The EMERSON KJ2221X1-BA1 is a field-wiring terminal block assembly designed to work in conjunction with the KJ2221X1-BB1 8-channel analog input(AI)module in Emerson’s DeltaV™Distributed Control System(DCS),specifically within the S-series I/O architecture.This terminal block serves as the physical and electrical interface between field instruments—such as 4–20 mA transmitters,thermocouples,or RTDs—and the DeltaV I/O module mounted on the backplane.The KJ2221X1-BA1 provides secure screw-terminal connections,built-in fuse protection,optional loop power supply distribution,and channel-level diagnostics,enabling safe,reliable,and maintainable signal acquisition in continuous process industries.

Engineered for use in demanding environments—including oil&gas,chemical,pharmaceutical,and power generation—the KJ2221X1-BA1 supports hot-swap capability,allowing technicians to replace the connected I/O module without de-energizing the field wiring or interrupting plant operations.Each of its eight channels features an individual LED indicator that shows power,signal presence,and fault conditions(e.g.,open circuit,overrange),significantly speeding up troubleshooting.When deployed in DeltaV SIS(Safety Instrumented System)applications with compatible safety-certified modules,the KJ2221X1-BA1 contributes to SIL 2/3 compliance by maintaining signal integrity and isolation per IEC 61508/61511 standards.Its modular design aligns with Emerson’s philosophy of reducing lifecycle costs through simplified installation,calibration,and spare parts management.

Technical Specifications

Parameter Name Parameter Value

Product Model KJ2221X1-BA1

Manufacturer Emerson Automation Solutions

Compatible I/O Module KJ2221X1-BB1(8-channel analog input)

Number of Channels 8

Field Connection Type Screw terminals(spring-clamp optional in some variants)

Supported Signal Types 4–20 mA(sink/source),0–10 V,±10 V,mV,RTD(Pt100),Thermocouple(J,K,T,etc.)

Loop Power Supply Optional 24 VDC(supplied via I/O module or external source)

Isolation Channel-to-channel and channel-to-backplane:≥500 Vrms

Fuse Protection Yes(replaceable mini-fuse per channel,typically 100 mA)

Operating Temperature–20°C to+70°C

Certifications CE,UL,CSA,ATEX,IECEx(for use in Zone 2/Div 2 hazardous locations)

Hot-Swap Support Yes(with DeltaV S-series chassis)

Diagnostic Indicators Per-channel LEDs for power,signal OK,and fault

Main Features and Advantages

Seamless DeltaV Integration:The KJ2221X1-BA1 is auto-detected by the DeltaV system when paired with the KJ2221X1-BB1 module.Engineers configure signal types,engineering units,and alarm limits directly in DeltaV Explorer,with real-time diagnostics visible in DeltaV Operate and AMS Device Manager.This eliminates manual jumpering or DIP switches,reducing configuration errors.

Enhanced Safety and Maintainability:Each channel includes a replaceable fuse to protect against short circuits in field wiring—a common cause of system-wide I/O failures.The hot-swap design allows module replacement during live operation,critical in 24/7 processes like refineries or bioreactors.Technicians can disconnect only the faulty channel without disturbing adjacent signals.

Universal Signal Compatibility:Unlike fixed-function terminal blocks,the KJ2221X1-BA1 supports a wide range of analog input types through software configuration of the KJ2221X1-BB1 module.This flexibility simplifies spares inventory and enables future sensor upgrades(e.g.,from 4–20 mA to HART-enabled transmitters)without rewiring.

Robust for Hazardous Areas:Certified for ATEX Zone 2 and NEC Class I Div 2,the KJ2221X1-BA1 can be installed directly in control rooms adjacent to hazardous zones.Its conformal-coated PCB and high dielectric strength ensure long-term reliability in corrosive or humid environments.

Application Field

The KJ2221X1-BA1 is extensively used in continuous process manufacturing where accurate,reliable analog signal acquisition is essential.In oil refineries,it connects pressure,temperature,and flow transmitters in distillation columns and hydrotreaters.In chemical plants,it interfaces with pH sensors,conductivity meters,and level transmitters in reactors and storage tanks.Pharmaceutical facilities rely on it for precise monitoring of bioreactor parameters under GMP compliance.

In power generation,the KJ2221X1-BA1 acquires boiler drum level,turbine bearing temperature,and flue gas O₂readings.When used in DeltaV SIS,it forms part of emergency shutdown(ESD)or burner management systems(BMS),where its isolation and diagnostic capabilities support functional safety requirements.Even in water treatment plants,it integrates turbidity sensors,chlorine residual monitors,and pump status feedback into a unified control architecture.Wherever DeltaV S-series I/O is deployed,the KJ2221X1-BA1 provides the trusted field interface that turns raw sensor data into actionable process intelligence.

Related Products

KJ2221X1-BB1:8-channel universal analog input module that plugs into the KJ2221X1-BA1

KJ2221X1-BC1:Alternative terminal base with spring-clamp terminals(vs.screw terminals)

KJ2201X1-BA1:Terminal block for 16-channel discrete input modules

KJ2231X1-BA1:Terminal assembly for analog output modules

DeltaV S-Series I/O Carrier(e.g.,KJ2005X1-BA1):Chassis that houses terminal blocks and I/O modules

AMS Device Manager:Emerson software for HART/Foundation Fieldbus device diagnostics via DeltaV

Installation and Maintenance

Pre-installation preparation:

Mount the KJ2221X1-BA1 onto the DeltaV S-series carrier rail before inserting the KJ2221X1-BB1 module.

Use twisted,shielded pair cables for each analog signal;ground the shield at the controller end only.

Verify that field transmitters are compatible with the selected input type(e.g.,2-wire vs.4-wire 4–20 mA).

Install the correct fuse rating(typically 100 mA fast-acting)in each channel before powering up.

Maintenance recommendations:

During routine rounds,check LED indicators for abnormal channel status(e.g.,red fault LED=open circuit or overrange).

Replace blown fuses only after identifying and correcting the root cause(e.g.,shorted cable,failed transmitter).

Clean terminal screws annually with contact cleaner to prevent oxidation-induced signal drift.

For calibration,use a precision current source to validate 4 mA/20 mA points via DeltaV Diagnostics.

Always power down the I/O carrier before removing the terminal block to avoid mechanical damage.

Product Guarantee

Every EMERSON KJ2221X1-BA1 is sourced from authorized Emerson distribution channels or refurbished to meet original factory specifications.Each unit undergoes visual inspection,continuity testing,and fuse validation.We provide a 12-month warranty against manufacturing defects,backed by access to DeltaV-certified support engineers for integration and troubleshooting guidance.Our goal is to ensure your field wiring infrastructure remains dependable,safe,and fully aligned with Emerson’s vision of intelligent,maintainable automation—because in process control,the quality of your data starts at the terminal block.

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