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UL101 Ultrasound Detector Kit


The CTRL UL101 detects and converts ultrasound
produced by mechanical, pneumatic, hydraulic, and
electrical systems. Changes in the amplitude and
characteristics of the ultrasound are easily detected in
noisy plant environments. Leaks are easily pinpointed.
Equipment problems are diagnosed even earlier than
other technologies such as vibration, infrared inspection,
or oil analysis.

Benefits of UL101 Acoustic Ultrasound Listening Devices


Simply adjust the sensitivity on the UL101 Ultrasound Detector's handheld receiver to pinpoint the sound. 


Ultrasound stays very close to the source. Instantaneous results from condition-based monitoring, leak detection, valve diagnostics, and more benefit from this principle for troubleshooting.


The UL101 Detectors is more sensitive than any detector on the market. Find the smallest leaks. Identify slow speed bearing problems easily, even below 10 rpms.


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.

Leak Detection (Pressure & Vacuum)
Electrical Inspection

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

Valves & Steam Traps

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

How the CTRL UL101 Ultrasound Detector Works

Using ultrasound detectors for condition-based monitoring and leak detection is a growing industry standard. 

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.

How UL101 Detects & Converts Ultrasound Into Human Audible Range of Hearing

Detect & Convert Ultrasound Into Human Audible Range of Hearing

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 Leak Detector 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)                            

Kit Shipping Dimensions    

17" x 8" x 14" (43 x 20 x 35 cm)

Kit Shipping Weight  

9 lbs (4 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 hardhat)

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

No calibration required.

Requalification of performance (once per year)             

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