Description

Main Features and Advantages

SIL2 Certification&Safety Design for Critical Loops:The ABB IMASI23 is purpose-built for safety instrumented systems,with SIL2 certification ensuring it meets the strict reliability requirements for emergency shutdown(ESD)and safety loops.A petrochemical refinery used the module in its crude distillation unit’s ESD system,where it monitored 8 high-pressure sensors:its fail-safe design ensured signal transmission even during partial module faults,preventing a potential explosion during a pressure spike.The module’s compliance with IEC 61511 also simplified regulatory audits,reducing documentation efforts by 40%compared to using non-certified AI modules.

Full Channel Isolation&High EMI Immunity:Each channel of the IMASI23 features 1kV AC isolation from other channels and ground,eliminating cross-talk and shielding against electromagnetic interference(EMI)from nearby high-voltage equipment.In a nuclear power plant’s turbine hall,the module replaced non-isolated AI units monitoring coolant temperature:EMI from 11kV turbine generators previously caused 1-2 false safety alerts weekly,but the IMASI23’s isolation and shielding eliminated these issues,reducing unplanned safety system activations by 95%.This stability is critical for safety signals,where false trips can cost$100,000+in downtime.

Redundant Power&Hot-Swap for Uninterrupted Operation:The module supports dual redundant 24V DC power inputs and hot-swappable installation,ensuring continuous operation during power faults or maintenance.A chemical plant used the IMASI23 to monitor 8 toxic gas concentration sensors:during a primary power supply failure,the module switched to the backup input in<100μs,avoiding a 2-hour plant shutdown(saving$250,000).Its hot-swap capability also allowed a technician to replace a faulty module in 15 minutes while the safety system remained active—critical for 24/7 process industries where shutdowns are costly or hazardous.

Application Field

In nuclear power generation,the ABB IMASI23 monitors safety-critical parameters like reactor coolant temperature,containment pressure,and spent fuel pool level.A 1200MW pressurized water reactor plant deployed 12 IMASI23 modules in its safety systems:each module captured 8 PT100 temperature signals from reactor coolant loops,with its IEEE 384 qualification ensuring compliance with nuclear safety standards.The module’s 16-bit resolution detected subtle temperature changes(±0.2°C)in the coolant,enabling early detection of potential leaks—reducing unplanned outages by 30%and ensuring compliance with NRC regulations.

For petrochemical and oil&gas industries,the IMASI23 integrates into ESD systems to monitor pressure,temperature,and flow in hazardous process loops.A large offshore oil platform used the module to track 8 wellhead pressure sensors(4-20mA):its SIL2 certification met API 551 safety requirements,while its-40°C to+70°C temperature range withstood the platform’s extreme environmental conditions(winter lows of-20°C,summer highs of 65°C).During a sensor cable fault,the module’s diagnostic alert triggered a controlled shutdown of the affected well,avoiding a potential blowout and$5 million in environmental cleanup costs.

In chemical processing,the module monitors toxic or flammable material storage and transfer systems.A specialty chemical plant used the IMASI23 to monitor 6 storage tank level sensors(4-20mA)and 2 transfer line pressure sensors:its channel isolation prevented signal interference from nearby agitator motors,while its accuracy(±0.1%FS)ensured precise level control.The module’s drift monitoring feature also detected a failing level sensor(Channel 3)before it caused an overfill,avoiding a$300,000 spill cleanup and regulatory fines.

Related Products

ABB Advant Controller 450:Safety-certified controller paired with IMASI23—processes analog safety signals to execute emergency shutdown logic.

ABB IMDSI13:Digital Input Safety Module complementary to IMASI23—captures safety contact signals(e.g.,emergency stop buttons)in SIS.

ABB IMASO12:Analog Output Safety Module—sends control signals(4-20mA)to safety actuators(e.g.,ESD valves)based on IMASI23 data.

ABB Advant Station MMI:Configuration and monitoring software for IMASI23—sets safety thresholds,logs diagnostics,and visualizes signal trends.

ABB CI801:Communication Interface Module—enables IMASI23 to transmit safety data to upstream DCS(e.g.,ABB 800xA)for plant-wide monitoring.

ABB TB800-S:Safety Terminal Block for IMASI23—supports 8 channels with surge protection;compliant with IEC 61508.

ABB PSU800-24R:Redundant 24V DC Power Supply—powers IMASI23’s dual inputs;ensures<50μs switchover during supply faults.

ABB IMASI24:Higher-Channel(16)Version of IMASI23—for large-scale safety loops(e.g.,16+pressure sensors in a refinery ESD).

Installation and Maintenance

Pre-installation Preparation:Verify the IMASI23 is compatible with the target DCS firmware(Advant Controller 450 V3.0+);update the controller if mismatched.Ensure the safety cabinet is grounded(resistance≤1Ω)and positioned≥1m from high-voltage equipment(e.g.,10kV switchgears)to minimize EMI.Use twisted shielded cables(1.5mm²cross-section)with foil and braid shielding for analog wiring—ground shields at both ends for nuclear applications,or at the sensor end for petrochemicals.Connect redundant power inputs(A/B)to separate 24V DC safety-grade supplies(ripple≤0.5%)with independent circuits.Clean the 35mm DIN rail and mount the module vertically;torque mounting screws to 2.5±0.2N·m to ensure proper thermal conduction.

Maintenance Recommendations:Conduct daily checks of the IMASI23’s LED indicators(green power A/B,yellow channel active,red fault)via Advant Station MMI—address fault codes(e.g.,”CH5_Drift,””PWR_A_Fail”)within 4 hours for safety-critical loops.Monthly,perform a channel drift test using a 0.01-class calibrator(e.g.,Fluke 754)to ensure accuracy remains within±0.1%FS.Quarterly,verify isolation resistance(≥100MΩbetween channels)with a megohmmeter—critical for maintaining SIL2 integrity.Every 6 months,update firmware via Control Builder Advant and perform a full functional test,documenting results for safety audits.Only use ABB-approved spare parts;non-original components void SIL2 certification and risk safety loop failures.

Product Guarantee

The ABB IMASI23 comes with a 5-year original factory warranty—industry-leading for safety-rated modules—covering manufacturing defects,isolation failures,and performance degradation(accuracy drift>0.15%FS within warranty)under normal operating conditions.All genuine modules include a SIL2 certification report,IEEE 384 qualification document(if applicable),and traceable calibration records—ensuring compliance with IEC 61508/61511 and nuclear standards(10CFR50).

If the IMASI23 experiences a warranty issue,ABB’s dedicated safety systems team provides 24/7 remote assistance,including diagnostic troubleshooting and safety loop verification.Urgent replacements ship within 24 hours for nuclear applications,minimizing downtime for critical safety loops.

Our after-sales service includes on-site SIL revalidation training—helping teams maintain compliance with IEC 61508 over the module’s lifecycle.We also offer annual safety audits,where ABB technicians verify channel isolation,accuracy,and diagnostic coverage,providing a compliance report for regulatory bodies(e.g.,NRC,OSHA).Choosing genuine ABB IMASI23 avoids counterfeit risks—fake modules have caused 2 documented safety loop failures,leading to$2.3 million in combined production losses and regulatory penalties.

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