TLM150 User’s Manual
Page 12
Revision 1.2
5 Troubleshooting
If you notice unexpected operation of the Maretron TLM150, follow the troubleshooting
procedures in this section to remedy simple problems.
Symptom
Troubleshooting Procedure
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 TLM150 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 3.3.1).
2. If using custom calibration, re-calibrate the TLM150 (see Section
3.3.2).
3. Ensure that the tank contains gasoline. Gasoline vapors must be
present in the tank in order for depth readings to be accurate. If you
have another fluid type, please use the Maretron TLM100 or TLM200
tank level monitors.
