Siemens SITRANS TF420 Single or Dual Input Smart Temperature Transmitter

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Smart temperature transmitter, one or two universal inputs (RTD, thermocouple, mV, Ohm), 4-20 mA output, HART communications optional, single or dual chamber enclosure for wall or pipe mounting, 55 mSec update time, digital accuracy to ±0.04° C (Pt100Ω), long-term stability <0.05% range/year or <0.18% range/5 years

Territory Restriction: Due to our territory agreement with Siemens, Lesman is the authorized Siemens sales representative in Illinois, Indiana, Wisconsin, Eastern Missouri, Michigan's Upper Peninsula, and the Paducah, KY area. If you are outside that area, you can find your local sales office or get technical assistance by calling 800-365-8766 or 972-522-4500, or sending an email to
  • Great for remote installations where the measuring point is hard to access, is subject to high temperatures or vibration, or you need to avoid long neck pipes and thermowells
  • One or two RTD, thermocouple, mV or Ohm inputs, available cold junction compensation
  • Input 2 can be redundancy (hot backup), for difference, absolute difference, minimum, maximum, or average
  • 4-20 mA output standard, HART 7 communication optional
  • Input accuracy to ≤±0.072° F (±0.04° C), varies by input type
  • Long-term stability <0.05% of range per year or <0.18% of range over five years
  • Available with single chamber diecast aluminum enclosure or dual chamber diecast aluminum or precision cast stainless steel enclosure
  • Can be configured locally through four-button interface, quick-start menus, and English language prompts, or via handheld or PC using SIMATIC PDM software and HART 7 communications
  • Local interface optional, available with closed lid or glass window
  • NAMUR NE43 compliant so you can see the difference between out-of-range errors and instrument faults
  • FM, CSA, ATEX, IECEx approvals; General purpose, intrinsically safe, flameproof, explosion-proof, dust ignition proof models available
  • SIL 2/3 certified for use in for safety critical applications

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