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RTI2 INSTRUCTIONS
Dwyer Instruments, Inc. • 219.879.8868 • www.dwyer-inst.com
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)
Display is in sleep mode
Push any button to reactivate display. (Display goes to
sleep after about 3 minutes of non-use.)
Display missing pixels
Damaged display module
Contact distributor for return/replacement
Display showing meaningless
characters
Unit's microcontroller crashed
Disconnect and reconnect power. If problem repeats,
contact distributor for return/replacement.
Display reads normally but flow
rate incorrect
Wrong K-factor or time base entered
Enter correct K-factor from meter, fitting, or manual
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 (RTI2
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 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 number for "micropower
option"
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
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.
TROUBLESHOOTING