Dynasonics 902_903 Series Portable Doppler Ultrasonic Flow Meter - Manual (Page 22)

Rev. 10/08
- 20 - D902/3
NOTE: The D902/3 flow meter system requires a full
pipe of flowing liquid before a successful startup can be
completed. Do not attempt to make adjustments or
change configurations until both a full pipe and liquid flow
are verified.
NOTE: If Dow 732 RTV was utilized to couple the
transducers to the pipe, the adhesive must fully cure
before power is applied to the instrument. Dow 732
requires 24 hours to cure satisfactorily. If Dow 111 silicone
grease was utilized as a couplant, the curing time is not
required.
Procedure:
1. Verify that all wiring is properly connected and routed.
2. Set the SENSITIVITY Control to -2. This control is
located on the D902/3 front panel.
3. Apply power. The POWER indicator will illuminate.
4. Adjust the SENSITIVITY control so that the right-most
LED on the SIGNAL STRENGTH bar meter just
illuminates or SIGNAL STRENGTH is at least in the
yellow/green region.
NOTE: It is undesirable to adjust the SENSITIVITY control
to a position higher than necessary, as ambient noise can
also be amplified. This noise can cause false readings to
occur.
5. If the pipe is full of a flowing liquid, the READ indicator
will illuminate and the display will begin reading fluid
velocity as FPS (Feet per Second) or MPS (Meters per
Second). It is normal to have low SIGNAL STRENGTH
and FAULT indication at ZERO flow.
6. If a SIGNAL STRENGTH reading in the green portion
of the bar meter or a FLOW ANALYZER indication
could not be obtained, refer to the troubleshooting
section of this manual.
PART 3 - STARTUP AND CONFIGURATION
Before Starting the
Instrument
Important!
Instrument Startup