Xylem FT420 RATE/TOTAL INDICATOR Manual de usuario descargar pdf (Pagina 12)

LT-65200063-D

9/20/10

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 ow rate)

Battery dead or loose (FT415 only) Wiggle battery, replace if over three years old

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

Battery nearly dead Replace battery if over three years old

Display reads normally, Wrong K-factor or time base entered Enter correct K-factor from meter, tting, or

ow rate incorrect manual

Display reads normally, Wrong pulse output setting Use “Set P” to correct pulse output setting

incorrect pulse output

Polarity reversed on pulse output terminals Reverse leads

Display reads normally, but Wrong 20 mA setting Use “Set 20” to correct target top ow rate

no (or incorrect) 4-20 mA output

(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 ow sensor manual for how to test

there is ow

Break in ow sensor circuit Check for continuity with multimeter

Flow sensor not battery-compatible Check ow sensor model number for

“micropower option”

Display reads ow rate when Long ow sensor wire, running parallel to Reroute wire or change to shielded wire

there is none power wires

Flow sensor malfunction See ow sensor manual to check

Flow “jitter” (oscillating slosh) reads as ow Consult factory for “anti-jitter” setting

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Xylem FT420 RATE/TOTAL INDICATOR Manual de usuario Pagina 12