{"product_id":"ntu-7b1-abb-bailey-infi-90-series-rtd-input-module","title":"NTU-7B1 ABB Bailey Infi 90 Series RTD Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eABB NTU-7B1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eNTU-7B1\u003c\/strong\u003e RTD Input Module, operates as a dedicated hardware component for field RTD sensor wiring termination and signal conditioning within Bailey Infi 90 DCS networks.\u003c\/p\u003e\n\u003ch3\u003eModel Suffix \u0026amp; Configuration Structure\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNTU\u003c\/strong\u003e: Base termination unit hardware series designator for field I\/O connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-7B1\u003c\/strong\u003e: Hardware variant specifying 8-channel temperature resistance input circuitry and 24 VDC bus power routing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eNTU-7B1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e17.8 x 5.1 x 17.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e8 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Lead Resistance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 25 OHM per wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003e0.5 kV AC channel-to-earth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge Protection\u003c\/td\u003e\n\u003ctd\u003e600 W TVS per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e250 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95 % RH non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network \u0026amp; Backplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe termination unit converts resistance values from 8 RTD field elements into structured signals, preserving backplane bus communication velocity to controller modules. Onboard 600 W Transient Voltage Suppressors (TVS) per channel clamp voltage surges, protecting backplane logic while supporting high I\/O density scaling inside control cabinets without compromising firmware flash compatibility.\u003c\/p\u003e\n\u003ch3\u003eSupply Items\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x ABB NTU-7B1 RTD Input Termination Unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTerminal Connections \u0026amp; Field Wiring Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead Resistance Limits\u003c\/strong\u003e: Verify that RTD field wiring does not exceed 25 OHM per wire to maintain measurement calibration accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurge \u0026amp; Earth Grounding\u003c\/strong\u003e: Connect the termination chassis earth connection directly to the main cabinet grounding bar to ensure effective 600 W TVS transient diversion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Cable Shielding\u003c\/strong\u003e: Terminate overall RTD cable shields at designated ground terminals to prevent high-frequency noise coupling onto input channels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat maximum field lead wire resistance is supported per channel on the NTU-7B1?\u003c\/p\u003e\n\u003cp\u003eThe input termination circuitry tolerates a maximum lead resistance of up to 25 OHM per wire without degrading measurement accuracy.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat transient surge protection capacity is built into each input channel?\u003c\/p\u003e\n\u003cp\u003eEach of the 8 input channels incorporates a 600 W Transient Voltage Suppressor (TVS) to clamp high-voltage field spikes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat isolation voltage exists between the input channels and chassis earth?\u003c\/p\u003e\n\u003cp\u003eThe module provides a dielectric isolation rating of 0.5 kV AC between field channel inputs and physical chassis earth ground.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat terminal voltage rating applies to the field wiring screw blocks?\u003c\/p\u003e\n\u003cp\u003eThe screw terminal assembly carries a continuous voltage insulation rating of 250 VAC for field signal safety.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the NTU-7B1 module be replaced while the system rack power is applied?\u003c\/p\u003e\n\u003cp\u003eField termination units can be disconnected and swapped with system power on provided connected controller I\/O channels are disarmed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat operating power supply rail is required by the NTU-7B1 board?\u003c\/p\u003e\n\u003cp\u003eThe termination module connects directly to a regulated 24 VDC power distribution bus inside the enclosure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does lead resistance symmetry affect three-wire RTD measurements?\u003c\/p\u003e\n\u003cp\u003eMatched lead resistance across all three wires ensures complete cancellation of line resistance errors in internal bridge networks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum operating ambient temperature for cabinet installation?\u003c\/p\u003e\n\u003cp\u003eThe module operates reliably within an ambient temperature range extending from -20 deg C up to +70 deg C.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":46021109153965,"sku":"NTU-7B1","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/NTU-7B1.jpg?v=1789279640","url":"https:\/\/www.maxwellplc.com\/products\/ntu-7b1-abb-bailey-infi-90-series-rtd-input-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}