Dwyer FLMG - Manual (Page 11)

Problem Probable Cause Try...
Blank Display
Flow rate steadily reads
zero when there is flow
Flow rate intermittently
drops when there is flow
Jumpy reading
Meter reads, but no
pulse output
Output pulses missing
Replace battery pack, check power
connections
Reading will resume when flow increases
Reposition meter for full pipe (see page 4)
Note flow direction arrow, reverse meter
Change power connections
Select another flow meter
Reposition meter for full pipe (see page 5)
Check for proper ground
Use external power source
(allows more flow averaging)
Install chemical injection line downstream
of meter (or far enough upstream to allow
complete mixing of fluids before meter)
Add pull-up resistor
Change output connections
Check display
No power plus dead backup battery
Flow is below cutoff (very low)
Pipe is not full
Meter is installed backwards
(display reads [ - ] )
Power connections reversed
Fluid conductivity <20microSiemens/cm
Pipe is not full
Missing or incorrect ground wire
Pulsing flow
Rapidly changing conductivity
(in chemical injection applications)
External device needs pull-up resistor
Reversed leads (polarity sensitive)
Meter not reading
TROUBLESHOOTING
Page 8