Maretron TLM100 NMEA 2000 Tank Level Monitor
Defender Home Page
Phone: 800-628-8225 Fax: 800-654-1616 Int'l.: 860-701-3400 Email: Contact Us
Shipping Info
no sales tax Defender Home Page
Your Cart

View Cart View Shopping Cart
Check My Order(s)
Track My Package(s)
Conversion Chart
Shopping Areas
Boats & Motors
 Defender Seal

Maretron TLM100 NMEA 2000 Tank Level Monitor

  • Maximum Tank Depth: 40"
  • Safe For All Fluids (Including Diesel) EXCEPT Gasoline
  • Item #: 
    Model #: 
    Shipping Weight: 
    0.65 Lbs.
    List Price: 
    Our Price:
    Status:      In Stock


    Maretron's TLM100 Tank Level Monitor is used to sense fluid levels of tanks by using ultrasonic technology. Ultrasonic, or sound waves, are transmitted via the TLM 100 mounted at the top of the tank and the flight times of the sound waves to and from the fluid are measured much like a depth sensor. What this means for you is that there are no difficult to handle long probes protruding into the tank, which often foul and/or corrode. Once the TLM100 calculates and transmits the fluid level over the NMEA 2000® network, you can observe tank levels anywhere on the vessel where there is an NMEA 2000® compatible display such as the Maretron DSM250.


    • The TLM100 is capable of sensing fluid levels in tanks up to 40” (1.02m) in depth.
    • It can be used for diesel, fresh water, waste water, black water, and oil tanks (see TLM150 for gasoline tanks or TLM200 for deeper tanks).
    • Unlike most tank senders that only work with rectangular tanks, the TLM100 can be calibrated for irregular tank shapes so you can know the true fluid level in your tanks.
    • 16 Programmable Tank Types Including Fuel, Fresh Water, Waste Water, Live Well
      • Programmable Tank Number(s)
        • Up to 16 per Tank Type
      • Programmable Tank Capacity
    • The TLM100 is mounted directly to the top of tanks using the industry standard SAE J1810 5-hole mounting pattern.
    • The TLM100 can also be mounted to tanks with threaded tank openings using optional adapters that included both a 1.5" NPT and a 1.25" BSP adapter.
    • There are other important TLM100 Optional Accessories* including:
      • An airlock for black water applications
        • Keeps the face of the ultrasonic transmitter from fouling
      • Optional focus tube to permit use on boats with planing hulls
        • Required if the vessel spends a significant amount of time with the bow pitched up.
    • Most importantly, the TLM100 is NMEA 2000® certified so you can view any and all tank levels anywhere on the vessel when using a compatible NMEA 2000® display.
    • The TLM100 is another key component of Maretron's N2KView® vessel monitoring and control system.

    Kit Includes:

    • (1) TLM100 Tank Level Monitor
    • (1) TLM100 Gasket
    • (1) TLM100 User’s Manual
    • (1) Warranty Registration Card


    • Electrica l
      • Operating Voltage: 9 to 16 Volts DC Voltage
      • Power Consumption: <100mA Average Current Drain
      • Load Equivalence Number (LEN): 2 [ NMEA 2000® Spec. (1LEN = 50mA)]
      • Reverse Battery Protection: Yes (Indefinitely)
      • Load Dump Protection: Yes (Energy Rated per SAE J1113)
    • Mechanical
      • Size:
        • 3.9”” x 1.2” x 1.0” (99mm x 30.5mm x 25.4mm) Interface Component
        • 2.7” dia. X 0.9” (68.6mm dia. x 22.9mm) Sensor Component
        • 8.5” (215.9mm) Interconnecting Cable
      • Weight: 12 oz. (340g)
      • Mounting: SAE J1810 5-hole bolt pattern Can mount to 1.25” BSP or 1.5” NPT using available adapters
    • Environmental
      • IEC 60945 Classification: Exposed
      • Degree of Protection: IP67
      • Operating Temperature: -25°C to 55°C
      • Storage Temperature: -40°C to 70°C
      • Relative Humidity: 93%RH @40° per IEC60945-8.2
      • Vibration: 2-13.2Hz @ ±1mm, 13.2-100Hz @ 7m/s2 per IEC 60945-8.7 Rain and Spray 12.5mm Nozzle @ 100liters/min from 3m for 30min per IEC 60945-8.8
      • Solar Radiation: Ultraviolet B, A, Visible, and Infrared per IEC 60945-8.10
      • Corrosion: (Salt Mist) 4 times 7days @ 40°C, 95%RH after 2 hour Salt Spray Per IEC 60945-8.12
      • Electromagnet Emission: Conducted and Radiated Emission per IEC 60945-9
      • Electromagnetic Immunity: Conducted, Radiated, Supply, and ESD per IEC 60945-10
      • Safety Precautions: Dangerous Voltage, Electromagnetic Radio Frequency per IEC 60945-12

    * TLM100 Optional Accessories:

    • TA-5H-1.25BSP 1.25” BSP Displacement Hull Tank Adapter
    • TA-5H-1.5NPT 1.5” NPT Displacement Hull Tank Adapter
    • TAL-5H SAE 5-Bolt Pattern Black Water Airlock
    • TAL-1.25BSP 1.25” BSP Black Water Airlock
    • TAL-1.5NPT 1.5” NPT Black Water Airlock
    • TFT-5H SAE 5-Bolt Pattern Non-Displacement Hull Focus Tube
    • TFT-1.25BSP 1.25” BSP Non-Displacement Hull Focus Tube
    • TFT-1.5NPT 1.5” NPT Non-Displacement Hull Focus Tube
    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to


    Maretron TFT-5H-Focus Tube Kit
    Item #: 260964
  • Applications: SAE 5-Bolt Pattern
  • Type: Non-Displacement Hull Focus Tube
  •  Include

    Model #:
    Maretron Fuel Flow Monitor
    Item #: 300861
  • Provides Precision Fuel Flow Information
  • Power: 12 Volts DC, Draw: 150mA
  • Includes True Temperature Compensation
  •  Include

    Model #:
    Maretron SAE 5-Bolt Pattern Focus Tube
    Item #: 260884
  • Includes Dead Band Eliminator
  • Applications: TLM100 / TLM150 Tank Level Monitors (Sold Separately)
  • The Deadband Eliminator Allows Accurate Tank Level Measurement
  •  Include

    Model #:

    Have A Suggestion?

    Help us make our site better for everyone! Let us know you've found something wrong or frustrating on this page and we will improve it. Please mark each that apply.

    Product has been improperly categorized
    Page loads too slowly
    Product information is incorrect
    Page has errors or bugs
    Site is frustrating or difficult to use
    Product image is missing or wrong
    Cannot find my size
    Spelling errors on page
    Not enough product information

    Comments or Examples:
    Examples: Missing information such as dimensions and model number, typos, inaccuracies, etc...

    Please include your e-mail address below if you would like us to respond to your comments or questions.             

    Join Our Email List And Receive our Monthly Promotions
    Defender Email Specials