UL101 Electrical Inspector

The UL101 Electrical

The UL101 Electrical Inspector utilizes airborne attachments to safely inspect sealed electrical panels and substations. The UL101 Electrical Inspector allows for early, long-distance detection of arcing, corona discharge, and tracking. Save time and money by reducing transmission/distribution loss and outages. The parabolic accessory (PowerBeam 300) can accurately pinpoint sources of ultrasound within 1 degree off target from up to 300 feet (91.44 meters) away. 

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The Benefits


Simply adjust the sensitivity on the UL101 Leak Detector’s handheld receiver to pinpoint the leak; scan areas from up to 300 feet away with the PowerBeam 300 parabolic accessory. 


Our UL101 Leak Detectors can find leaks faster and more accurately. Your systems can now run at normal and even improved vacuum levels to improve power turbine efficiency. 


Ultrasound travels in linear paths and doesn’t tend to travel around corners or reflect. Using CTRL’s acoustic ultrasound listening products, leaks are not easily masked. 


The cost of a high end ultrasound detector is 3 to 5 times less than the cost of a helium leak detection system. CTRL’s UL101 products are priced competitively compared to industry leaders, require less training, and are faster to use. 

Key Features

Inspections performed at a safe distance

Ability to inspect sealed panels

Lightweight, accurate, easy to use

Identify arcing and tracking potential as a safety precaution before using infrared

Inspect sealed panels without opening or using an expensive window

How It Works

Using ultrasound detectors for leak detection is a growing industry standard. Acoustic ultrasound leak detection is recommended by many, such as the U.S. Department of Energy, as the best method for detecting the location of leaks in order to minimize energy waste and improve plant efficiency.

The CTRL UL101 Leak Detector converts the ultrasound (40 kHz +/- 1 kHz) down into the audible range and outputs to a headset. All other frequencies are filtered, so that even the smallest air/gas, vacuum, or refrigerant leak can be detected and pinpointed in a noisy plant environment.

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Technical Specifications

PowerBeam 300 Dimensions

21″ x 17″ x 1.26″ (533 x 432 x 32 mm)

Dish Diameter

13″ (330 mm)              

PowerBeam 300 Weight

45 oz (1.3 kg)  

PowerBeam 300 Power Supply

Two (2) Standard AAA Alkaline Batteries (for laser)

Battery Life

> 20 hours

PowerBeam 300 Warranty

1 Year Parts & Labor

Receiver Dimensions

8.75” x 1.26” x 1.26” (222 x 32 x 32 mm)

4.125″ x 1.26″ x 1.26″ (105 x 32 x 32 mm)

Receiver Weight

11.6 oz (330 g)


Extruded Aluminum, wall thickness .09″ (2.3 mm)

Receiver Power Supply

9-Volt Alkaline (> 45 continuous hours use)

Kit Shipping Dimensions

21″ x 18″ x 7″ (53 x 18 x 46 cm)

Kit Shipping Weight

14 lbs (6 kg)

Distance of Reception

Up to 300 feet (90 m)    

Sensitivity Threshold

Minimum Intensity: 10-12 W/m2 (0 dB SPL)

Minimum Ultrasonic Pressure: 2.0 x 10-5 PA @ 40 kHz     

Working Resonance Frequency

1.8 – 2.2 kHz @ level 0.7 (or -3 dB SPL)

Operating Temperature Range

-4° to +130° F (-20° to +54° C)


Industrial Grade/600-Ohm Impedance

21-24 dB External Noise Attenuation 


Over or Behind-the-Head (for use with hardhat)

5-year parts & labor on all manufacturer’s defects

No calibration required

Requalification of performance (once per year)

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