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000031 Standard Model
000033 Intrinsically Safe Model

The UL101 Troubleshooter includes all the components of the UL101 Leak Detector and more, further extending the application of your device. From leak detection to lubrication, the UL101 Troubleshooter is a fully integrated solution for a variety of issues you may encounter within your system. 


The CTRL UL101 Troubleshooter converts ultrasound signals produced by industrial machinery and vehicles into easily recognizable audible sounds, so the user can evaluate the condition of individual components, even in extremely noisy plant environments. The CTRL UL101 Troubleshooter is used worldwide for condition-based monitoring maintenance, quality control, and leak detection.

CTRL UL101 Troubleshooter

Benefits of UL101 Acoustic Ultrasound Listening Devices


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


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. 

No calibration needed

Acoustic ultrasound is used for indication and location, not leak measurement. Our leak detectors are ruggedized for use in the most caustic of environments, including power plants


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


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. 


Leak Detection (Pressure & Vacuum)

Airborne ultrasound detection can be used to easily locate leaks within a noisy environment.

Electrical Inspection

Airborne ultrasound can be used to detect various electrical faults; including corona discharge, tracking, and arcing.

Valve & Steam Traps

Effective use of the UL101 for ultrasound detection on valves can reduce and even eliminate unnecessary overhaul costs, resources, and time. 

(containment testing)

Acoustic ultrasound solutions for quality control and maintenance on non-pressurized cabin

Mechanical Inspection 
(Motor Bearings, Gearboxes, etc)

Precision lubrication is based on using an acoustic ultrasound detector to see if the bearing needs to be lubricated

Key Features

  • Fixed Frequency

  • High Sensitivity to all turbulent flow air, gas, or vacuum leaks

  • Easily adjustable sensitivity and gain

  • Lightweight, one-handed operation

  • Converts ultrasound to easily recognizable audible sounds

  • Standard 9-Volt Battery means no waiting to recharge

Intrinsically Safe

ANSI /UL 91 3-88, for DIVISION 1, CLASS I, Groups A, B, C and D, CLASS II, Groups E, F, G and CLASS III

It also complies with DIVISION 2, CLASS I, Groups A, B, C and D, CLASS II , Groups F, G, and CLASS III

Technical Specifications

UL101 Troubleshooter Technical Specifications

Receiver / Transmitter 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 / Transmitter Weight    
11.6 oz (330 g)

6.2 oz (175 g)                                                   
Kit Shipping Dimensions

17" x 8" x 14" (43 x 20 x 35 cm)    
Kit Shipping Weight

10 lbs (4.5 kg)    

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

9-Volt Alkaline (> 45 continuous hours use)    
Distance of Reception

Up to 150 feet (45 m)    
Sensitivity Threshold

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

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

1.8 - 2.2 kHz @ level 0.7 (or -3 dB SPL)    
Working Resonance Frequency

40 kHz +/- 1.5 kHz    
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 hard hat)

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

No calibration required

Requalification of performance (once per year)        

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