{"product_id":"ai843-3bse028925r1-abb-s800-analog-thermocouple-input-module","title":"AI843 3BSE028925R1 ABB S800 Analog Thermocouple Input Module","description":"\u003ch3\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e ABB S800 Thermocouple\/mV Input Module Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eABB AI843\u003c\/strong\u003e\u003c\/span\u003e (article number 3BSE028925R1) is an 8-channel differential analog input module designed for precision temperature and low-millivolt instrumentation within the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eS800 I\/O series\u003c\/strong\u003e\u003c\/span\u003e. It handles linear voltage inputs spanning -30 mV to +75 mV alongside direct integration for Thermocouple Types B, C, E, J, K, L, N, R, S, T, and U. Equipped with a high-resolution 16-bit A\/D converter, the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e delivers maximum measurement accuracy of 0.1% across critical processing loops.\u003c\/p\u003e\n\u003cp\u003eFor accurate thermocouple cold-junction compensation (CJC), the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e features a dedicated 4-wire Pt100 RTD reference channel. CJC temperature monitoring can be performed locally on the MTU terminal block, positioned at a remote connection point, or fixed via software parameters. The module supports both single and redundant Modulebus topologies, providing robust signal processing for demanding industrial environments.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eBrand \u0026amp; Manufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e (Part Number: 3BSE028925R1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eProduct Family\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/s800-i-o\"\u003eS800 I\/O\u003c\/a\u003e System\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDifferential Thermocouple \/ Millivolt Analog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eInput Channel Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Differential Channels + 1 Dedicated 4-wire Pt100 CJC Channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eSignal Ranges\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-30 mV to +75 mV linear; TC Types B, C, E, J, K, L, N, R, S, T, U\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eConversion Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 Bits A\/D Converter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eSystem Redundancy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSupports Single and Redundant Modulebus Architecture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eMeasurement Error\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaximum 0.1% of full scale; Temperature Drift: Typ. 10 ppm\/°C (Max 25 ppm\/°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 1 MΩ; Filter Rise Time (0-90%): 1.1 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eUpdate Cycle Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e320 + 80 * (active channels) ms at 50 Hz; 267 + 67 * (active channels) ms at 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eNoise Rejection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCMRR: 100 dB (50\/60 Hz); NMRR: \u0026gt; 40 dB (50\/60 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eField Wiring Limits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaximum 600 meters (656 yards) cable length or max 500 Ω loop resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eModulebus Current Draw\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 mA at +5VDC; 50 mA at +24VDC (Power Dissipation: 1.5 W)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eStatus Diagnostics\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFront LEDs: F(ault), R(un), W(arning); Wire-break open-circuit detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eHazardous Certifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ecULus Class 1 Div 2, Class 1 Zone 2, ATEX Zone 2; CE Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color: #f2f2f2;\"\u003e\u003cstrong\u003eEnvironmental Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIP20; ISA-S71.04 G3 Conformal Coating for harsh gas environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatible Termination Units (MTUs)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.ubestplc.com\/products\/3bse069209r1-tu818-abb-compact-module-termination-unit\"\u003eTU818\u003c\/a\u003e \/ TU818V1 (Compact MTU, 50V)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.ubestplc.com\/products\/extended-module-termination-unit-abb-tu830\"\u003eTU830\u003c\/a\u003e \/ \u003ca href=\"https:\/\/www.ubestplc.com\/products\/module-termination-unit-tu830v1-3bse013234r1-abb\"\u003eTU830V1\u003c\/a\u003e (Extended MTU, 50V, Screw Terminals)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.ubestplc.com\/products\/3bse038726r1-tu833-abb-extended-module\"\u003eTU833\u003c\/a\u003e \/ TU833V1 (Extended MTU, 50V, Spring Terminals)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.ubestplc.com\/products\/abb-3bse020850r1-tu842-module-termination-unit\"\u003eTU842\u003c\/a\u003e \/ TU842V1 (Redundant MTU, Modulebus)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.ubestplc.com\/products\/abb-tu843-3bse021443r1-redundant-mtu\"\u003eTU843\u003c\/a\u003e \/ TU843V1 (Redundant MTU, Extended)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTarget Equipment \u0026amp; Application Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Gas Turbines \u0026amp; Boilers:\u003c\/strong\u003e Multi-point exhaust gas temperature profiling using Type K or Type S thermocouples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical Reactor Vessels:\u003c\/strong\u003e Core exothermic reaction monitoring via high-accuracy differential mV\/TC sensor grids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Heat-Treating Furnaces:\u003c\/strong\u003e High-temperature zone regulation using Type R, S, or B thermocouples under ISA G3 corrosive environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlass \u0026amp; Ceramics Annealing Kilns:\u003c\/strong\u003e Precision thermal gradient tracking across continuous belt conveyors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetrochemical Distillation Columns:\u003c\/strong\u003e Distributed tray temperature surveillance wired through redundant S800 I\/O clusters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic \u0026amp; Signal Isolation Capabilities\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDetects open-circuit field wiring conditions per channel and triggers Channel Error flags in System 800xA \/ Compact Product Suite.\u003c\/li\u003e\n\u003cli\u003eMonitors dedicated Pt100 cold-junction bounds (-40°C to +100°C), reporting CJ channel error if reference drift exceeds safety parameters.\u003c\/li\u003e\n\u003cli\u003eProvides groupwise isolation from ground with 500V AC dielectric test ratings, suppressing field-induced ground potential shifts.\u003c\/li\u003e\n\u003cli\u003eDisplays local status via front panel LEDs for immediate visual fault tracing during site maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eIn thermal process instrumentation, cold-junction compensation errors are the primary cause of system-wide drift. The \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eABB AI843\u003c\/strong\u003e\u003c\/span\u003e addresses this by utilizing a dedicated 4-wire Pt100 RTD reference loop on the termination unit. When commissioning an \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e module, ensure the MTU terminal screw torque matches manufacturer limits. Loose connections on the Pt100 reference terminals induce unwanted resistance offset, which skews cold-junction calculation across all 8 differential channels.\u003c\/p\u003e\n\u003cp\u003eDuring a field support case on a refinery cracking unit, a client experienced intermittent channel fault warnings on their \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e module. Field investigation revealed unshielded thermocouple extension wire routed in parallel with 480V motor supply cables over a 200-meter run. The electromagnetic interference overwhelmed the common-mode rejection filter. Enclosing the field wiring in grounded steel conduit and setting the Modulebus update cycle rate to match line frequency (50 Hz \/ 60 Hz filtering) eliminated signal distortion, establishing stable 16-bit temperature telemetry.\u003c\/p\u003e\n\u003ch3\u003eSelection Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify Sensor Interface:\u003c\/strong\u003e Select the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e for low-mV or thermocouple inputs (Types B, C, E, J, K, L, N, R, S, T, U). For standard 2-wire 4-20mA transmitters, select AI810 or AI835 instead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelect Matching MTU:\u003c\/strong\u003e Use TU830V1 for single-module installations requiring screw terminals, or TU842\/TU843 for redundant Modulebus backplane architectures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Space Planning:\u003c\/strong\u003e When mounting vertically in compact MTU enclosures, ensure cabinet cooling limits maximum ambient operating temperature to 40°C (104°F) instead of the standard 55°C horizontal rating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePackaging, Shipping \u0026amp; Warranty Terms\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e Ships as a factory-sealed \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eABB AI843\u003c\/strong\u003e\u003c\/span\u003e module (Article Number 3BSE028925R1) with mechanical keying pins set to code BA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Coverage:\u003c\/strong\u003e Includes a comprehensive 12-month factory-backed replacement warranty effective from dispatch date.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder Dispatch:\u003c\/strong\u003e Ships within 24 to 48 hours following order verification from our inventory hub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLogistics Network:\u003c\/strong\u003e Worldwide priority air transport via FedEx, UPS, and DHL Express.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can individual channels on the AI843 be configured for different thermocouple types simultaneously?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. Channel parameters on the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e are independently configurable in software. You can assign a Type K curve to Channel 1 while running a -30 to +75 mV linear range on Channel 2.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens to the AI843 temperature output if the CJC Pt100 RTD sensor fails or disconnects?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The module flags a Channel 8 CJ error when reference temperatures drop below -40°C or exceed +100°C. Depending on control logic settings, the system defaults to a user-defined fixed junction temperature parameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the AI843 module hot-swappable during active PLC backplane operation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. The \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e supports live insertion and removal (HCIR) when installed on compatible redundant S800 MTUs (such as TU842 or TU843) without interrupting adjacent Modulebus communication.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the maximum cable length constraint affect remote TC installations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Total field cable loop resistance must remain under 500 Ω over a maximum distance of 600 meters. Exceeding 500 Ω total resistance reduces A\/D converter accuracy and increases susceptibility to common-mode noise.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I configure mechanical keying for the AI843 on the matching MTU terminal unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Position the mechanical keying code wheel on the MTU to position \u003cstrong\u003eBA\u003c\/strong\u003e before inserting the \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAI843\u003c\/strong\u003e\u003c\/span\u003e module. This prevents accidental insertion of incorrect voltage module types into the slot.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":45401207668918,"sku":"AI843","price":163.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/AI843.jpg?v=1788419703","url":"https:\/\/www.plcsparehub.com\/products\/ai843-3bse028925r1-abb-s800-analog-thermocouple-input-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}