Maretron FPM100 用户手册

If you notice unexpected operation of the Maretron FPM100, follow the troubleshooting 
procedures in this section to remedy simple problems. 
 

No Pressure 
data visible on 
NMEA 2000

®

 

network. 

1.  Ensure that the FPM100 is properly connected to the NMEA 2000

®

 

network. 

2.  Ensure that pressure transducers are properly connected to the 

FPM100. 

3.  Ensure that each channel that you wish to monitor is configured as 

“Pressure/Vacuum”and that instance numbers are configured 
correctly. 

4.  Ensure that the FPM100 has the appropriate NMEA 2000 PGNs 

enabled. 

Inaccurate 
pressure output 

1.  Ensure that the “Pressure at 4mA” and “Pressure at 20mA” 

configuration items are set to appropriate values for the pressure 
transducer. 

2.  Check that the vent tube from the pressure transducer (only present 

on some transducers) is not kinked or blocked. 

3.  Remove the pressure transducer from the tank opening and ensure 

that the pressure port on the transducer is not clogged. 

No Tank Level 
data visible on 
NMEA 2000

®

 

network. 

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). 

Inaccurate tank 
level output 

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

programmed properly (see Section Error! Reference source not 
found.). 

2.  If using custom calibration, re-calibrate the FPM100 (see Section 

3.  Check that the vent tube from the pressure transducer is not kinked or 

blocked. 

4.  Remove the pressure transducer from the tank opening and ensure 

that the pressure port on the transducer is not clogged. 

Zero pressure 
readings when 
pressurized 

1.  Ensure that the “Pressure at 4mA” and “Pressure at 20mA” 

configuration items are set to appropriate values for the pressure 
transducer. 

2.  Check the cable connection to the pressure transducer to see whether 

a wire has become loose, or the cable has been cut.