{"product_id":"mtl3073-mtl-temperature-signal-converter","title":"MTL3073 MTL Temperature Signal Converter","description":"\u003ch3\u003e\u003cstrong\u003eMTL3073 Temperature Transmitter – Thermocouple and RTD Signal Conversion\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #0070c0;\"\u003eMTL3073\u003c\/span\u003e\u003c\/strong\u003e is a single-channel temperature transmitter from the MTL3000 range. It converts low-level temperature sensor signals into a standard 4–20mA output. The module connects hazardous-area temperature sensors to safe-area control and monitoring equipment.\u003c\/p\u003e\n\u003cp\u003eIts input supports eight thermocouple types and 2-, 3-, or 4-wire platinum RTDs. Engineers can configure sensor linearisation, measurement range, monitoring, testing, and tag information through MTL PCS45 software. An integral cold-junction compensation sensor supports thermocouple measurements that require CJC.\u003c\/p\u003e\n\u003cp\u003eThis signal conversion architecture helps integrate field temperature measurements into PLC, DCS, and process monitoring systems. It also provides configurable sensor burnout responses for different process alarm strategies.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e01 | Temperature Input and Output Architecture\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe MTL3073 processes one temperature input channel and produces a nominal 4–20mA output. Its input circuit accepts either thermocouple EMF signals or platinum RTD resistance signals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermocouple input:\u003c\/strong\u003e Supports J, K, T, E, R, S, B, and N types to BS 4937.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTD input:\u003c\/strong\u003e Supports 2-, 3-, and 4-wire platinum RTDs to BS 1904\/DIN 43760, with 100Ω at 0°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput measurement:\u003c\/strong\u003e Accepts -75 to +75mV or 0 to 400Ω.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigurable span:\u003c\/strong\u003e 3 to 150mV or 10 to 400Ω.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTD excitation:\u003c\/strong\u003e 200µA nominal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput signal:\u003c\/strong\u003e 4–20mA nominal, with direct or reverse action.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum load:\u003c\/strong\u003e 600Ω.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel count:\u003c\/strong\u003e One.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor thermocouple applications, the module provides automatic or selectable cold-junction compensation. Its specified CJC error is ≤1.0°C. Engineers can also select upscale, downscale, or disabled sensor-burnout behavior.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e02 | Measurement Accuracy and Signal Stability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eLow-level temperature signals require careful treatment before they enter a control system. The MTL3073 combines input conditioning, sensor linearisation, and configurable signal conversion to support stable process measurements.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePerformance item\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalibration temperature\u003c\/td\u003e\n\u003ctd\u003e20°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermocouple \/ mV input accuracy\u003c\/td\u003e\n\u003ctd\u003e±15µV or ±0.05% of input value, whichever is greater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRTD input accuracy\u003c\/td\u003e\n\u003ctd\u003e±80mΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput accuracy\u003c\/td\u003e\n\u003ctd\u003e±11µA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermocouple input drift\u003c\/td\u003e\n\u003ctd\u003e±0.003% of input value\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRTD input drift\u003c\/td\u003e\n\u003ctd\u003e±7mΩ\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput drift\u003c\/td\u003e\n\u003ctd\u003e±0.6µA\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon-mode rejection\u003c\/td\u003e\n\u003ctd\u003e120dB for 240V at 50Hz or 60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries-mode rejection\u003c\/td\u003e\n\u003ctd\u003e40dB at 50Hz or 60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThese specifications matter when engineers evaluate temperature measurement stability in electrically noisy plant environments. Correct sensor wiring, grounding, and cable routing remain essential for reliable readings.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e03 | Hazardous-Area Interface and Electrical Safety\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe MTL3073 accepts temperature signals from sensors installed in hazardous locations. Its specified source location is Zone 0, IIC, T4, and Division 1, Group A. The module provides 250V AC isolation between safe-area and hazardous-area circuits.\u003c\/p\u003e\n\u003cp\u003eEngineers must check the complete intrinsic safety loop before connecting a field sensor. The following entity parameters and safety descriptions support that assessment.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection \/ parameter\u003c\/th\u003e\n\u003cth\u003eSafety specification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminals 5 and 6\u003c\/td\u003e\n\u003ctd\u003eNon-energy-storing apparatus: ≤1.2V, ≤0.1A, ≤20µJ, and ≤25mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminals 5 and 6 connection condition\u003c\/td\u003e\n\u003ctd\u003eMay connect to an IS loop with open-circuit voltage not exceeding 10V, without further certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminals 7 and 8\u003c\/td\u003e\n\u003ctd\u003e7.2V, 950Ω, 8mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration socket input\u003c\/td\u003e\n\u003ctd\u003eUmax 11.2V, Imax 12mA, Wmax 280mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration socket output\u003c\/td\u003e\n\u003ctd\u003eUmax 7.2V, Imax 8mA, Wmax 15mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFM entity parameters, terminals 5, 6, 7, and 8\u003c\/td\u003e\n\u003ctd\u003eVt ≤7.2V, It ≤11.5mA, Ca ≤11.0µF, La ≤245mH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFM entity parameters, terminals 5 and 6 only\u003c\/td\u003e\n\u003ctd\u003eVt ≤1.2V, It ≤3.8mA, Ca ≤1000µF, La ≤3.6mH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eDo not assess these values in isolation. Confirm the applicable control drawing, installation method, field device parameters, and site hazardous-area requirements before commissioning.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e04 | Power, Protection, and Module Status\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrical item\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent consumption at 24V\u003c\/td\u003e\n\u003ctd\u003e57mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent consumption at 20V\u003c\/td\u003e\n\u003ctd\u003e55mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent consumption at 35V\u003c\/td\u003e\n\u003ctd\u003e60mA with 20mA signal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower dissipation at 24V\u003c\/td\u003e\n\u003ctd\u003e1.2W with 20mA signal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower dissipation at 35V\u003c\/td\u003e\n\u003ctd\u003e2.0W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaceable fuse\u003c\/td\u003e\n\u003ctd\u003e100mA, 5 × 20mm glass, DIN 41571 Sheet 2, semi-time-lag (M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e250V AC between safe-area and hazardous-area circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED indication\u003c\/td\u003e\n\u003ctd\u003eOne green LED for power and status indication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e170g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe replaceable fuse provides a defined module protection component. During maintenance, engineers should verify the specified fuse type and rating rather than install an arbitrary replacement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e05 | Configuration and Default Operating Settings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eEngineers configure the MTL3073 using a personal computer running MTL PCS45 software and a PCL45 interface. Software settings cover sensor selection, linearisation, output range, monitoring, testing, and identification fields.\u003c\/p\u003e\n\u003cp\u003eUnless the order specifies another setup, the module uses the following default configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput type:\u003c\/strong\u003e Type K thermocouple.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinearisation:\u003c\/strong\u003e Enabled.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature unit:\u003c\/strong\u003e °C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold-junction compensation:\u003c\/strong\u003e Enabled.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamping:\u003c\/strong\u003e 0 seconds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoothing:\u003c\/strong\u003e 0 seconds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput zero:\u003c\/strong\u003e 0°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput span:\u003c\/strong\u003e 250°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTag and description:\u003c\/strong\u003e Blank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen-circuit alarm:\u003c\/strong\u003e High, upscale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmitter failure alarm:\u003c\/strong\u003e Low, downscale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold-junction failure alarm:\u003c\/strong\u003e Low, downscale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine frequency:\u003c\/strong\u003e 50Hz.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not assume the default Type K setup matches the installed sensor. Confirm the sensor type, engineering unit, range, output direction, and alarm response before connecting the module to the live process.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e06 | Suitable Equipment and Industrial Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe MTL3073 suits process installations that require temperature measurement in hazardous areas and a standard current signal for safe-area equipment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePLC temperature input systems:\u003c\/strong\u003e Supplies a 4–20mA signal to compatible analog input channels for process logic and equipment interlocks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDCS process control:\u003c\/strong\u003e Transfers thermocouple or RTD measurements to distributed control systems for temperature regulation and alarm handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil and gas facilities:\u003c\/strong\u003e Supports temperature monitoring around process vessels, utility systems, and hazardous-area equipment, subject to the complete installation approval.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical processing plants:\u003c\/strong\u003e Converts field temperature signals for reactor, pipeline, and process skid monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower generation:\u003c\/strong\u003e Supports temperature measurement circuits for auxiliary equipment, thermal systems, and plant utilities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePharmaceutical production:\u003c\/strong\u003e Provides a current output for temperature monitoring in process equipment and utility systems where the sensor and installation meet site requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial furnace and heating systems:\u003c\/strong\u003e Supports thermocouple-based temperature monitoring and configurable high or low burnout responses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e07 | Practical Diagnostic and Maintenance Guidance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe MTL3073 provides configurable monitoring and testing functions, sensor-burnout response settings, and a green power\/status LED. These functions help maintenance teams investigate temperature signal problems. They do not replace field sensor checks or loop testing.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eObserved condition\u003c\/th\u003e\n\u003cth\u003eRecommended engineering checks\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature value differs from the local instrument\u003c\/td\u003e\n\u003ctd\u003eConfirm the selected sensor type, linearisation, engineering unit, and configured measurement span.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermocouple reading shows an unexpected offset\u003c\/td\u003e\n\u003ctd\u003eCheck thermocouple polarity, extension cable type, terminal connections, and cold-junction compensation settings.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRTD measurement fluctuates\u003c\/td\u003e\n\u003ctd\u003eInspect the 2-, 3-, or 4-wire connection arrangement. Check terminal tightness and cable resistance.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput remains at an alarm limit\u003c\/td\u003e\n\u003ctd\u003eReview sensor continuity, burnout direction, open-circuit alarm configuration, and transmitter failure settings.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePLC or DCS reading does not match the module output\u003c\/td\u003e\n\u003ctd\u003eMeasure the loop current and verify the receiving channel scaling, polarity, and load resistance.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule status indication appears abnormal\u003c\/td\u003e\n\u003ctd\u003eCheck the power supply, fuse condition, wiring, and module configuration. Consult the applicable product documentation for LED status interpretation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eField maintenance recommendation:\u003c\/strong\u003e Record the original configuration before changing sensor type or output range. After adjustment, verify the input response and 4–20mA output with suitable test equipment. Confirm the receiving controller displays the correct engineering value before returning the loop to service.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e08 | Global PLC Spare HUB's Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe MTL3073 is more than a basic current signal converter. Its practical value lies in combining thermocouple and RTD compatibility with configurable measurement processing and hazardous-area isolation.\u003c\/p\u003e\n\u003cp\u003eWhen selecting this module, engineers should focus on three points. First, match the input configuration to the actual field sensor. Second, verify the required temperature range and 4–20mA scaling. Third, check the intrinsic safety parameters against the complete field loop.\u003c\/p\u003e\n\u003cp\u003eA common commissioning issue occurs when a replacement module retains its default Type K configuration while the installed sensor uses another thermocouple type or an RTD. The resulting measurement can appear stable but remain incorrect. Always verify the configuration against the instrument datasheet and loop documentation.\u003c\/p\u003e\n\u003cp\u003eFor maintenance teams, preserving the original configuration record and documenting each adjustment can reduce troubleshooting time during future sensor replacement or control system maintenance.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e09 | Frequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What should engineers verify before replacing an existing temperature interface with the MTL3073?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCompare the field sensor type, input span, output scaling, burnout strategy, and intrinsic safety loop parameters. Also confirm that the receiving analog input accepts the configured 4–20mA signal and its associated load.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Why can a temperature reading remain stable but still be inaccurate after commissioning?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA stable signal does not always indicate correct sensor configuration. An incorrect thermocouple type, RTD wiring mode, or linearisation setting can produce a consistent measurement offset. Compare the configured sensor type with the field instrument documentation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: How should maintenance teams approach intermittent temperature fluctuations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStart with the field wiring rather than immediately changing the transmitter settings. Inspect terminal connections, cable condition, sensor continuity, and grounding. For thermocouple circuits, also check extension cable compatibility and cold-junction connections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: What information should a plant record during a module configuration change?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRecord the sensor type, input span, engineering unit, output zero, output span, direct or reverse action, burnout response, and line frequency. Retain the previous configuration and document the reason for each change.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5: How can engineers distinguish a field sensor problem from a receiving controller problem?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCompare the measured sensor input, module output current, and controller engineering value. If the output current matches the expected value but the controller display does not, investigate analog input scaling and loop wiring. If the current is incorrect, continue checking the sensor circuit and transmitter configuration.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e10 | Product Supply and Technical Support\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e MTL3073 Temperature Transmitter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e MTL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct function:\u003c\/strong\u003e Intrinsically safe thermocouple and RTD signal conversion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12-month warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping options:\u003c\/strong\u003e FedEx, UPS, and DHL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping arrangement:\u003c\/strong\u003e 24–48 hr shipping, subject to stock and order confirmation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/MTL3073.png?v=1793869064\" alt=\"\"\u003e\u003c\/p\u003e","brand":"MTL","offers":[{"title":"Default Title","offer_id":45013889745078,"sku":"MTL3073","price":127.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/MTL3073_68cb3136-817b-4d9b-a482-efe0d54ca7a8.jpg?v=1793868417","url":"https:\/\/www.plcsparehub.com\/products\/mtl3073-mtl-temperature-signal-converter","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}