Seametrics FT500-Series - Manual (Page 8)

LT-65200029-A
9/1/10
Seametrics Incorporated • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • www.seametrics.com
TROUBLESHOOTING
Problem Probable Cause 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)
Display missing segments Damaged display module Contact distributor for return/replacement
Display reading meaningless Unit’s microcontroller crashed Disconnect and reconnect power, if problem
characters repeats, contact distributor for
return/replacement
Display reads normally, Wrong k-factor entered Check k-factor, enter proper one if in error
flow rate incorrect
Display reads normally, Wrong pulse output setting Check “SetP” to see if it is set correctly no
(wrong) pulse output
Polarity reversed on pulse output terminals Reverse leads and see if problem corrects
Display reads normally, Wrong 20 mA setting Check “Set 20” to see if it matches target top
no (wrong) 4-20 mA output flow rate
(FT420 only)
Inadequate loop power supply voltage Check voltage. For 4-20 mA applications,
24 Vdc recommended
Polarity incorrect in 4-20 mA loop circuit Compare to Connections diagram
Display reads zero when Flow sensor failed Consult flow sensor manual for how to test
there is flow
Break in flow sensor circuit Check for continuity with multimeter
Display reads flow rate when Long flow sensor wire, running parallel to Reroute wire or switch to shielded wire
there is none power wires
Flow sensor malfunction See flow sensor manual to check