Maretron TLM200 Ultrasonic Tank Sensor

The TLM200 is used to sense levels of liquid tanks using ultrasonic technology and transmit the liquid levels over an NMEA 2000 network. The TLM200 is NMEA 2000 certified so you can view any and all tank levels anywhere on the vessel using a compatible NMEA 2000 display such as the Maretron DSM250. The TLM200 is capable of sensing tanks up to 104" (2.64m) in depth. It can be used for diesel, fresh water, grey water, black water, and oil tanks but not for gasoline. Unlike most tank senders that only work with rectangular tanks, the TLM200 can be calibrated for irregular tank shapes so you know the true level of your tanks.

The TLM200 can be mounted on tanks with a SAE J1810 5-hole mounting pattern, or to tanks using 1.5" NPT or 1.25" BSP threaded openings via available adapters (sold separately). 

Product Features

  • NMEA 2000 Interface
  • Integrated ultrasonic level sensor
  • Replaces conventional tank sender
  • Maximum tank depth 104"
  • Works with diesel, fresh water, grey water, black water (holding tanks), and oil tanks
  • Not for use in gasoline tanks
  • Programmable tank capacity
  • Accommodates irregularly shaped tanks with 16 point calibration
  • 16 programmable tank types including fuel, fresh water, waste water, live well
  • Programmable tank number up to 16 per tank type
  • Bolts into existing fitting
  • SAE J1810 5-hole, 1.5" NPT, or 1.25" BSP Mounting
  • Most US boats use the standard SAE 5-bolt mount and do not need an adapter
  • Uses an NMEA 2000 drop cable (not included) to connect to a T on the network backbone


To configure this unit for tank size and shape, you will need either (1) a Maretron DSM250 display or (2) the free Maretron N2K Analyzer software running on a laptop connected to the network through a Maretron USB100 interface.