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Revision 1.2 Page 13
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Symptom Troubleshooting Procedure
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 65-75% (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
TLM150 gasket should be used. The TLM150 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 TLM150 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 TLM150 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.
Figure 8 – Troubleshooting Guide
If these steps do not solve your problem, please contact Maretron Technical Support (refer to
Section 7 for contact information).