Teledyne 4250, Installation And Operation Manual, Page: 23 / 204

4250 Flow Meter
Section 1 Introduction
1-11
Table 1-4 Technical Specifications for the Low Profile AV Sensor
Weight 2.1 lbs (.95 kg) including cable and connector
Sensor Dimensions Length: 6.00 inches (15.2 cm)
Width: 1.31 inches (3.3 cm)
Height: 0.75 inches (1.9 cm)
Nose Angle 110° from horizontal
Wetted Sensor Material Epoxy, chlorinated polyvinyl chloride (CPVC), Stainless-steel
Cable Material Polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC)
Cable Length 25 ft (7.6 m)
Maximum Distance (between sensor
and module) 75 ft (22.8 m) with optional extension cables. The distance can be extended
up to 1000 ft (300 m) with the optional Quick Disconnect Box.
Operating Temperature 32° to 122°F (0° to 50°C)
Storage Temperature -40° to 160°F (-40° to 71°)
Level Measurement Range 0.033 to 10.0 ft (0.01 to 3.05 m)
Maximum Allowable level 20 ft (6.1 m)
Level Measurement Accuracy 0.033 to 5.0 ft: ± 0.008 ft/ft (0.01 to 1.52 m: ± 0.008 m/m)
>5.0 ft: ± 0.012 ft/ft (>1.52 m: ±0.012 m/m)
Accuracy per foot of change from calibrated depth @77°F (25°C). Includes
non-linearity and hysteresis.
Temperature Coefficient ±0.0023 ft/°F (±0.0013 m/°C)
Maximum error within operating temperature range at zero pressure (per
degree of change from calibration temperature).
Maximum Long-term Drift 0.033 ft (±0.010 m)
Velocity Measurement Method Doppler Ultrasonic
Frequency 500 kHz
Transmission Angle 20° from horizontal
Typical minimum depth for velocity
measurement 1 inch (25 mm)
Range -5 to +20 ft/s (-1.5 to +6.1 m/s)
Velocity Accuracy -5 to +5 ft/s (-1.5 to +1.5 m/s): ± 0.1 ft/s (±0.03 m/s)
5 to 20 ft/s (1.5 to 6.1 m/s): 2% of reading
Velocity accuracy for a uniform velocity profile in water with a
speed-of-sound of 4,850 ft/s.