Seametrics FT450 User Manual

FT430/440/450 INSTRUCTIONS
Seametrics • 253.872.0284 Page 15 seametrics.com
TROUBLESHOOTING
Problem Probable Causes Things to try…
Display blank No power to the unit Check for minimum 12 Vdc at power terminals
Short in sensor circuit Disconnect sensor, see if display returns (zero ow rate)
Battery dead or loose (FT450 only) Wiggle battery, replace if over three years old
Display is in sleep mode Push any button to reactivate display. (Display goes to
sleep after about 3 minutes of non-use)
Display jumps between 2 distinct
values
Display lter (Set F) is set too low in
BURST mode
Increase Set F to a higher value
Display missing pixels Damaged display module Contact distributor for return/replacement
Display reads ow rate when there
is none
Long ow sensor wire, running parallel
to power wires
Reroute wire or change to shielded wire
Flow sensor malfunction See ow sensor manual to check
Flow "jitter" (oscillating slosh) reads as
ow
Consult factory for "anti-jitter" setting
Display reads normally but ow rate
incorrect
Wrong K-factor or time base entered
K-factor was not entered in pulses per
gallon
Enter correct K-factor from meter, tting, or manual
Change K-factor to pulses per gallon
Display reads normally but ow rate
is too high
Input pulses are being delivered in
groups or bursts followed by moments
of inactivity
Enable BURST mode.
Display reads normally but incorrect
pulse output
Wrong pulse output setting Use "Set P" to correct pulse output setting
Polarity reversed on pulse output
terminals
Reverse leads
Display reads normally but no (or
incorrect) 4-20mA output (FT440
only)
Wrong 4mA setting or wrong 20mA
setting
Use "Set 4" to correct target minimum ow rate
Use "Set 20" to correct target top ow rate
Inadequate loop power supply voltage Check voltage (For 4-20mA applications, 24 Vdc is
recommended)
Polarity incorrect in 4-20mA loop circuit Compare to Connections diagram
Display reads OVERANGE Display exceeds 5 digits
Reed is enabled and pulse input exceeds
50Hz
Adjust pulse input or rate unit to display fewer characters
Disable REED
Display reads zero when there is
ow
Flow sensor failed Consult ow sensor manual for how to test
Break in ow sensor circuit Check for continuity with multimeter
Flow sensor not battery-compatible Check ow sensor model for "micropower option"
Display showing meaningless
characters
Unit's microcontroller crashed
Battery nearly dead
Disconnect and reconnect power. If problem repeats,
contact distributor for return/replacement
Replace battery
Pulse output values are incorrect External electrical noise disrupting
output function
Tie commons together by adding a jumper between pulse
out [-] and power [-] and/or EGND
Totalizer does not always appear to
display the total ow
Break in power to meter The totalizer's memory is only updated every 15 minutes.
If power is lost, the totalizer will retain the value last
written but will not be updated to reect any ow
between the last write and the time the power was lost

Seametrics FT450 Specifications

General

Brand	Seametrics
Model	FT450
Category	Measuring Instruments
Language	English