Dynasonics 902_903 Series Portable Doppler Ultrasonic Flow Meter - Manual (Page 25)

Rev. 10/08
- 23 - D902/3
The FULL SCALE key allows the entry of the highest
anticipated fluid velocity. The entry is made as either FPS
(Feet per Second) or MPS (Meters per Second) dependent
on whether the unit is configured as U.S. units or Metric
units. The FULL SCALE input is used by the D902/3
microprocessor to scale the 4-20 mA output and adjust the
resolution of the flow rate display.
Acceptable input range for the FULL SCALE constant is
shown in Table 4.
* NOTE: FULL SCALE values below 1.5 FPS (0.5 MPS)
are not recommended.
NOTE: If an entered value is out of the acceptable range
of the instrument, a RANGE! indication will be displayed.
The meter will not allow any additional entries to be made
until a legitimate value is entered.
Two useful equations which relate volumetric flow in round
pipes to flow velocity are as follows:
FPS = U.S. GPM × 0.409
ID 2 (inches)
MPS = LPM × 21.23
ID 2 (mm)
I.D. U.S. METRIC
Max 20 FPS 8 MPS
Min * n/a n/a
Table 4
PART 3 - STARTUP AND CONFIGURATION
Full Scale Input
Important!
Volume to Velocity
Conversion
NOTE: If a decimal value is to be entered, enter 0 . X X.
The zero must precede the decimal value (if less than 1)
and only two numbers should be entered after the
decimal value.