Specification, Specification 41 – Dwyer UFB User Manual

Page 45

7: Specification

GENERAL

DSP Measurement Technique:

Transit time.

Timing Resolution:

50 pico-second, continuous signal level indication on display.

Flow Velocity Range:

Minimum Velocity 0.33 ft/s; Max Velocity 33 ft/s: Bi-directional.

Turn Down Ratio:

200:1

Accuracy:

±0.5% to ±2% of flow reading for flow rates >0.03 ft/s and Pipe OD >3.0 in (75 mm).
±3% of flow reading for flow rates >0.03 ft/s and Pipe OD in range 0.5 to 3.0 in (13 to 75 mm).
±6% of flow reading for flow rates <0.03 ft/s.

Repeatability:

±0.5% of measured value or ±0.03 ft/s whichever is the greater.

Reynolds Number Correction:

Flow velocity corrected for Reynolds number over entire velocity range.

Response Time:

< 500 ms depending on pipe diameter.

Selectable Flow Units:

VELOCITY: m/sec, ft/sec.
VOLUME: L/s, L/min, L/h, gal/s gal/min, gal/h, USgals/s, USgals/min, USgals/h, Barrel/h, Barrel/
day, m³/s, m³/min, m³/h.

Selectable Volume Units:

US gallons, gallons, barrels (oil), liters, m³.

Total Volume:

12 Digits - forward and reverse.

APPLICABLE FLUID TYPES

Fluid Condition:

Clean liquids or oils that have less than 3% by volume of particulate content. Applications include
river water, sea water, potable water, demineralized water, glycol/water mix, hydraulic systems
and diesel oil.

APPLICABLE PIPE TYPES

Pipe Materials:

Any sonic conducting medium such as Carbon Steel, Stainless Steel, Copper, UPVC, PVDF,
Concrete, Galvanized Steel, Mild Steel, Glass, Brass. Including Lined Pipes - Epoxy, Rubber,
Steel, Plastic.

Pipe Dimension (outside diameter):

Min 0.5

inch (13 mm); Max 197 inches (5000 mm) with D sensor set.

Pipe Wall Thickness:

0.04 to 3.0 inches (1 to 75 mm).

Pipe Lining:

Applicable pipe linings include Rubber, Glass, Concrete, Epoxy, Steel.

Pipe Lining Thickness:

0.0 to 1.0 inches (0 to 25 mm).

Pipe Wall Temperature Range:

Standard sensor operating temperature is -4°F to +275°F (-20°C to +135°C).