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Tank Level Monitor (40" depth)

* TLM100 requires configuration. (Maretron DSM570, DSM410, USB100, or IPG100 needed to configure)

Link to knowledge base and frequently asked questions

Is this the correct tank monitor for my application?

Follow this Link for a Knowledge Base Article describing which product to use for your particular Tank Monitoring Application.

Maretron's TLM100 is used to sense fluid levels of tanks by using ultrasonic technology. Ultrasonic, or sound waves, are transmitted via the TLM100 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 Maretron's N2KView® vessel monitoring system, or by Maretron's DSM570 / DSM410 color graphics displays.

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 FPM100 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.

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 optional focus tube to permit use on boats with planing hulls, which is 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.

  • Diesel Tanks
  • Fresh Water Tanks
  • Live Well Tanks
  • Waste Water Tanks
  • Black Water Tanks
The following accessories are available for the TLM100:
TM Gasket (2 Pack) Replacement gaskets for TLMs, Focus Tubes, and Submersible Pressure Transders using the industry standard SAE J1810 5-hole mounting pattern.
1.25" BSP Displacement Hull Tank Adapter Part Number: TA-5H-1.25BSP
1.5" NPT Displacement Hull Tank Adapter Part Number: TA-5H-1.5NPT
SAE 5-Bolt Pattern Non-Displacement Hull Focus Tube Part Number: TFT-5H
SAE 5-Bolt Pattern Focus Tube with Dead Band Eliminator Part Number: TFTDBE-5H
1.25" BSP Non-Displacement Hull Focus Tube Part Number: TFT-1.25BSP
1.5" TFT Non-Displacement Hull Focus Tube Part Number: TFT-1.5NPT

These examples monitor a single tank.


The following examples monitor 6 tanks - 2 fuel, 2 fresh water, waste water, and black water.

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