Model 251

Parabolic Pinpointer

The Model 251 Ultrasonic Detector delivers industry-leading precision for detecting arcing and corona on energized overhead power lines. This rugged, all-in-one unit combines an 18-inch clear parabolic reflector with an integrated ultrasonic sensor and receiver, allowing field crews to quickly and accurately pinpoint electrical faults from the ground or bucket truck. Advanced directional sensitivity cut through ambient interference, providing fast, reliable identification of problem hardware.

Operators simply aim through the built-in sight, monitor the signal strength meter, and confirm faults with clear audible feedback for confident visual and audio verification. Designed to complement Radar Engineers’ RF-based locators, the Model 251 adds ultrasonic line-of-sight precision to your diagnostic toolkit, making it an essential instrument for utility professionals seeking faster and more certain power line diagnostics.

Features

Clear Parabolic Reflector
Integrated Ultrasonic Sensor & Receiver
Signal Strength Meter
Speaker Output
Gain Control & Attenuator Switch
Source Indication LED
Corona Check LED
Headphone Jack
Padded Carrying Case
Clear Parabolic Reflector

Specifications

Type Ultrasonic
Detection Range Up to 50 feet typical for moderate arcing; greater for strong sources
Transducer High-sensitivity ultrasonic microphone with parabolic reflector
Indicators Signal-strength meter and LED activity indicator
Gain Control High/Low range selector with 
fine-tune adjustment
Audio Output Built-in speaker and 3.5 mm headphone jack

Mechanical

Dimensions 18.5" × 2.5" × 5.5"
Reflector Diameter 18 inches (46 cm)
Weight 3 lbs

Power

Power Source One 9V Alkaline Battery
Battery Life Approximately 8 Hours of Operation

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