Maretron TLM100 Manuale Utente

 

 

No tank level 
output 

1.  If operating in the NMEA 2000

 Mode, check the connection to the 

NMEA 2000

®

 interface (see Section 2.5.1) and tighten if necessary. 

2.  Ensure that power is supplied to the NMEA 2000

®

 network. Proper 

network power can be checked by measuring the voltage at an open 
tee between NET-S and NET-C. The voltage should be between 9 and 
16 volts.  

3.  Ensure that both trunk line terminators are in place. Proper network 

termination can be checked by removing network power and 
measuring the resistance at an open tee between NET-L and NET-H 
signals. The resistance should read approximately 60 ohms (two 120 
ohm terminators in parallel equals 60 ohms). 

4.  Remove the TLM100 sensor component from the tank opening and 

ensure that the surface of the ultrasonic sensor is not fouled. 

Inaccurate tank 
level output 

1.  If operating with a rectangular tank, ensure that the tank depth is 

programmed properly (see Section 3.4.1). 

2.  If using custom calibration, re-calibrate the TLM100 (see Section 

3.4.2). 

Erratic 
Readings  

1.  Remove the sender and place it on top of a standard paper towel roll 

core. Be sure the towel core is on a hard surface. Reset the unit to 
factory defaults using either a DSM250 display or N2KAnalyzer. 
Power the unit up and wait for two minutes. The tank level value 
should read 70-80% (this number can vary depending on the paper 
towel roll dimensions). If you see a depth reading in this range, the 
sensor is operational, so please follow the next steps in this 
sequence. 

2.  Determine if the sensor’s gasket is installed properly. Only a Maretron 

TLM100 gasket should be used. The TLM100 is not compatible with 
cork gaskets, silicone sealant, or metal fittings. The gasket only lines 
up a single way. A clear line of sight should be observed through all of 
the mounting holes with the gasket installed. 

3.  The TLM100 transmits sensor signals at a 6° angle. Think of the 

signal path as a cone getting progressively wider the deeper the tank 
is. There must not be any obstructions within this cone like baffles, 
return lines or clean out pipes. 

4.  Sloped or grooved tank bottoms will cause an issue with a signal 

return when the tank is empty, causing the TLM100 to transmit an 
inaccurate or erratic reading or no reading at all. As long as there is 
some fluid providing a flat surface to reflect the signal, you should 
receive a valid reading. 

 
If these steps do not solve your problem, please contact Maretron Technical Support (refer to 
Section 7 for contact information).