Choosing A Mounting Location; Figure 1 - Tlm100 Operation - Maretron TLM100-01 User Manual

(or the tank bottom if the tank is empty). The cone width of the beam transmitted by the
TLM100 sensor component is 6°. Please refer to Figure 1 below for a diagram of the waves
emitted and received by the TLM100.
The deadband is the area in front of the electroacoustic transducer of ultrasonic sensors, in
which measurement is not possible. Basically, it represents the time (converted into a
distance) which is needed to emit the sending impulse and then activate the receiver. The
deadband, or minimum depth that can be measured by the TLM100 is 2" (5.08cm).
Figure 1 – TLM100 Operation

2.3 Choosing a Mounting Location

The primary function of the TLM100 is to sense levels of liquid in tanks using ultrasonic
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technology and transmit this information over NMEA 2000 network so that tank level information
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can be viewed anywhere on the vessel where there is an NMEA 2000 compatible display.
The TLM100 tank level monitor consists of two parts: 1) the sensor, which mounts onto the top
of the tank and contains the ultrasonic level measurement components, and 2) the interface,
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which converts the measured data into NMEA 2000 format and transmits the data over the
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NMEA 2000 network.
The interface component of the TLM100 may be mounted anywhere, subject to the length of
the cable connecting it to the sensor component.
The sensor component of the TLM100 must be mounted on the tank whose level is to be
monitored. Choosing a proper mounting location for the sensor component of the TLM100 is
critical to obtaining accurate tank level readings. For best results, please follow these
recommendations:
 The sensor component of the TLM100 must be mounted flat, so that the round
transceiver portion of the TLM100 faces straight downward.
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