FT430/440/450 INSTRUCTIONS
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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 flow 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 filter (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 flow rate when there
is none
Long flow sensor wire, running parallel
to power wires
Reroute wire or change to shielded wire
Flow sensor malfunction
See flow sensor manual to check
Flow "jitter" (oscillating slosh) reads as
flow
Consult factory for "anti-jitter" setting
Display reads normally but flow rate
incorrect
Wrong K-factor or time base entered
K-factor was not entered in pulses per
gallon
Enter correct K-factor from meter, fitting, or manual
Change K-factor to pulses per gallon
Display reads normally but flow 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 flow rate
Use "Set 20" to correct target top flow 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
flow
Flow sensor failed
Consult flow sensor manual for how to test
Break in flow sensor circuit
Check for continuity with multimeter
Flow sensor not battery-compatible
Check flow 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 flow
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 reflect any flow
between the last write and the time the power was lost
