{"product_id":"mtl5081-mtl-isolator-thermocouple-mv-signal-module","title":"MTL5081 MTL Isolator | Thermocouple mV Signal Module","description":"\u003ch3\u003e\u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e Millivolt Signal Isolator – Product Overview\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e is a single-channel millivolt signal isolator from MTL. It transfers low-level DC signals from hazardous areas to safe-area instruments. The module provides electrical isolation between the input, output, and power circuits.\u003c\/p\u003e\n\u003cp\u003eThe \u003cb\u003eMTL5081\u003c\/b\u003e supports thermocouple circuits with external cold junction compensation. It accepts signals from thermocouples and other DC millivolt sources. Its isolated output preserves the input signal for measurement and control.\u003c\/p\u003e\n\u003cp\u003eTwo top-mounted switches configure thermocouple burnout response. Users can enable or disable safety drive. They can also select upscale or downscale output behavior.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003e\u003cb\u003eMTL\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eSingle-channel DC millivolt signal isolator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal source\u003c\/td\u003e\n\u003ctd\u003eAny DC millivolt source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput and output range\u003c\/td\u003e\n\u003ctd\u003e0 to ±50 mV; overrange to ±55 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput resistance\u003c\/td\u003e\n\u003ctd\u003e60 Ω nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransfer accuracy\u003c\/td\u003e\n\u003ctd\u003eLinearity and repeatability below 0.05% of reading or ±5 µV, whichever is greater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature drift\u003c\/td\u003e\n\u003ctd\u003e±(2 µV + 0.002% of input) per °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse time\u003c\/td\u003e\n\u003ctd\u003eTypically 150 µs to settle within 10% of final value\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003eDC to 4 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply\u003c\/td\u003e\n\u003ctd\u003e20 to 35 V DC; maximum current 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower dissipation\u003c\/td\u003e\n\u003ctd\u003e0.5 W at 24 V; 0.7 W at 35 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e250 V AC between safe circuits, hazardous circuits, and power supply circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower indicator\u003c\/td\u003e\n\u003ctd\u003eGreen LED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput terminals\u003c\/td\u003e\n\u003ctd\u003e1: Negative; 2: Positive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput terminals\u003c\/td\u003e\n\u003ctd\u003e11: Negative; 12: Positive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply terminals\u003c\/td\u003e\n\u003ctd\u003e13: Negative; 14: Positive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cb\u003eMeasurement note:\u003c\/b\u003e The manufacturer’s supplied specification does not state a separate resolution, sensitivity, or ambient temperature range. The ±5 µV accuracy criterion and temperature drift figure describe signal performance. They do not establish digital resolution or a guaranteed operating temperature range.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eHazardous-Area Safety and Certification\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe millivolt source may operate in Zone 0, IIC, T4–T6, subject to suitable certification.\u003c\/li\u003e\n\u003cli\u003eThe source may also operate in Class I, Division 1, Group A locations.\u003c\/li\u003e\n\u003cli\u003eInput terminals 1 and 2 form a non-energy-storing apparatus.\u003c\/li\u003e\n\u003cli\u003eSpecified input limits are ≤1.2 V, ≤0.1 A, ≤20 µJ, and ≤25 mW.\u003c\/li\u003e\n\u003cli\u003eThe input can connect to an intrinsically safe loop with open-circuit voltage below 28 V, without additional certification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eImportant:\u003c\/b\u003e Confirm the complete loop design against the applicable control drawing, entity parameters, and local hazardous-area requirements. The supplied data does not identify specific certificate numbers.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eInstallation Guide\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module in a suitable safe-area enclosure or approved system location.\u003c\/li\u003e\n\u003cli\u003eVerify the supply voltage remains between 20 and 35 V DC.\u003c\/li\u003e\n\u003cli\u003eConnect the millivolt source to terminals 1 and 2 with correct polarity.\u003c\/li\u003e\n\u003cli\u003eConnect the receiving instrument to terminals 11 and 12.\u003c\/li\u003e\n\u003cli\u003eConnect the DC supply to terminals 13 and 14.\u003c\/li\u003e\n\u003cli\u003eUse suitable wiring practices for low-level thermocouple and millivolt signals.\u003c\/li\u003e\n\u003cli\u003eKeep signal wiring away from high-current switching cables where practical.\u003c\/li\u003e\n\u003cli\u003eConfirm the hazardous-area installation meets the applicable intrinsic safety requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eCommissioning and Maintenance\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e supports straightforward commissioning through its terminal layout and top-mounted switches.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the green LED to confirm power availability.\u003c\/li\u003e\n\u003cli\u003eApply a known millivolt signal and verify the receiving instrument reading.\u003c\/li\u003e\n\u003cli\u003eCheck input and output polarity before evaluating signal accuracy.\u003c\/li\u003e\n\u003cli\u003eConfigure the burnout safety drive for the required process response.\u003c\/li\u003e\n\u003cli\u003eTest upscale or downscale behavior using an approved simulation method.\u003c\/li\u003e\n\u003cli\u003eInspect terminals and wiring during scheduled maintenance.\u003c\/li\u003e\n\u003cli\u003eRecord baseline readings to help identify later signal drift.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eField troubleshooting:\u003c\/b\u003e If the output remains incorrect, first verify the input signal, supply voltage, terminal connections, and burnout switch settings. Then compare the measured output against a calibrated millivolt source.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eCompatibility and Application Notes\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eThermocouple systems:\u003c\/b\u003e Supports thermocouple millivolt signals when the application provides external cold junction compensation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDC millivolt sources:\u003c\/b\u003e Accepts compatible low-level DC sources within the specified range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReceiving instruments:\u003c\/b\u003e Connects to safe-area instruments that accept the module’s isolated millivolt output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIntrinsic safety systems:\u003c\/b\u003e Requires compatibility with the system’s loop design and hazardous-area certification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck the receiving instrument’s input impedance and measurement range before installation. Confirm the application does not require internal cold junction compensation.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eTypical Industrial Applications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eProcess temperature measurement:\u003c\/b\u003e Transfers thermocouple signals from hazardous process areas to safe-area temperature instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRefinery monitoring:\u003c\/b\u003e Isolates millivolt signals from temperature sensors in classified locations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eChemical processing:\u003c\/b\u003e Supports temperature monitoring where intrinsically safe instrumentation is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIndustrial furnace monitoring:\u003c\/b\u003e Transfers compatible thermocouple signals to control-room instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRemote measurement panels:\u003c\/b\u003e Provides an isolated signal path between field sensors and receiving equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eGlobal PLC Spare HUB's Insight\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eLow-level millivolt signals require careful wiring and commissioning. Small voltage errors can cause noticeable measurement deviations.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eField example:\u003c\/b\u003e A thermocouple in a classified process area feeds a safe-area temperature indicator through the \u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e. The technician checks polarity, verifies the external cold junction compensation, and applies a known millivolt signal. The technician then confirms the isolated output and tests the selected burnout response.\u003c\/p\u003e\n\u003cp\u003eThis approach helps distinguish wiring faults from configuration errors. It also verifies the signal path before the process returns to service.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePractical recommendation:\u003c\/b\u003e Select the burnout direction based on the receiving instrument and the process alarm strategy. Do not assume upscale drive always represents the safest response. Confirm the required fault indication with the control-system engineer.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003ePackaging and Delivery\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduct: \u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e millivolt signal isolator.\u003c\/li\u003e\n\u003cli\u003ePackaging: Protective packaging suitable for industrial electronic equipment.\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cb\u003e12-month warranty\u003c\/b\u003e, subject to the seller’s warranty terms.\u003c\/li\u003e\n\u003cli\u003eShipping carriers: \u003cb\u003eFedEx, UPS, and DHL\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eDispatch: Typically within \u003cb\u003e24–48 hours\u003c\/b\u003e, subject to stock confirmation and order processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eContact Global PLC Spare HUB to confirm availability, delivery arrangements, and warranty coverage before ordering.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003e1. Can the MTL5081 connect directly to a thermocouple?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eYes, it accepts thermocouple millivolt signals. The application must provide external cold junction compensation.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. What happens when a thermocouple cable breaks?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe module provides configurable safety drive for thermocouple burnout or cable breakage. The switches enable or disable this function and select upscale or downscale response. Verify the resulting indication during commissioning.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e3. How can technicians investigate an unstable temperature reading?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eCheck terminal polarity, cable condition, grounding, and nearby electrical interference. Compare the input and output using a calibrated millivolt source. Also verify the receiving instrument’s input configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e4. What should buyers confirm before selecting the MTL5081?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eConfirm the signal range, external cold junction compensation, required burnout direction, supply voltage, and receiving instrument compatibility. Review the hazardous-area loop documentation before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e5. Is the MTL5081 suitable for every thermocouple installation?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The module accepts compatible millivolt signals, but the complete installation must meet its electrical and safety requirements. Check the sensor, compensation method, receiving instrument, and intrinsic safety design together.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eRequest a Quote\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eContact \u003cb\u003eGlobal PLC Spare HUB\u003c\/b\u003e for pricing, availability, technical clarification, and delivery options for the \u003cb\u003e\u003cspan style=\"color: #1684c7;\"\u003eMTL5081\u003c\/span\u003e\u003c\/b\u003e millivolt signal isolator.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/MTL5081.png?v=1792722496\" alt=\"\"\u003e\u003c\/p\u003e","brand":"MTL","offers":[{"title":"Default Title","offer_id":45014020751542,"sku":"MTL5081","price":158.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/MTL5081.jpg?v=1792722461","url":"https:\/\/www.plcsparehub.com\/products\/mtl5081-mtl-isolator-thermocouple-mv-signal-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}