Dwyer LOFM - Manual (Page 3)

OPEratiOn and trOUBLESHOOting
Problem Probable causes try...
No output
Flow rate incorrect
Reverse flow connections
Check piping conditions
Select a different flowmeter
Check electrical connections
Select a different flowmeter
Relocate meter or reduce noise
Select another flowmeter
Check piping conditions
Relocate meter or reduce noise
Reversed flow direction
Empty pipe
Flow rate below minimum
Loose or incorrect wiring
Fluid conductivity too low
Electrical noise
Fluid conductivity too low
Empty pipe
Electrical noise
LT-65200322-022412
2/24/2012
trOUBLESHOOting
The meter will output one pulse when powered up. The newly-
installed meter takes from a few seconds to a minute for the
signal to stabilize at startup, especially if it has been dry. In
normal operation, keep the meter filled with fluid and pow-
ered on to prevent this delay. When the meter is mounted
properly, an empty pipe detection feature will normally detect
absence of liquid in the pipe and register zero flow.
The 4 to 20 mA signal outputs 4 mA at zero flow and 20 mA
at 20 gallons/minute flow or 3 gallons/sminute, depending
on model. The pulse signal is a 50% duty cycle pulse set at
LOFM-1: 500 pulses/liter (1892 pulses/gallon),
LOFM-2: 1,000 pulses/liter (3785 pulses/gallon).
OPEratiOn
Dwyer Instruments, Inc. • 102 Indiana Highway 212 • Michigan City, IN 46360 • USA
(P) 219.879.8868 • (F) 219.872.9057 • 1.800.872.9141 • www.dwyer-inst.com
WarrantY/rEtUrn
Refer to "Terms and Conditions of Sale" in
our catalog or on our website. Contact customer
service to receive a Returns Goods Authoriza-
tion number before shipping your product back
for repair. Be sure to include a brief description
of the problem plus any relevant applciation
notes.