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CTRL UL101 Ultrasonic Receiver

In Stock


Manufacturer: CTRL Systems, Inc.
The UL101 is a handheld ultrasonic receiver for compressed air/gas leak detection as well as predictive maintenance, troubleshooting, safety, and QC.
UL101 Models


The CTRL UL101 is a handheld, non-destructive inspection system that is useful for detection of compressed air/gas leaks as well as applications in predictive maintenance, condition based monitoring (CBM), troubleshooting, safety, and quality control.

The UL101 Receiver, the primary component in the system, detects and converts ultrasound into easily recognizable sounds within the human range of hearing and supplies output to a headset, as well as to an analog meter. The UL101 offers the best signal and sensitivity available on the market today (at least 3 times more sensitive than nearest competitor as tested by NASA).

Several UL101 Detector Kits are available for various applications and budgets:

  • UL-101 Air Audit Kit Standard
  • UL-101 Air Audit Kit Intrinsically Safe
  • UL-101 Full Kit Standard
  • UL-101 Full Kit Intrinsically Safe
  • UL-101 Condition Based Monitoring (CBM) Kit

Size & Weight Details:

  • Receiver Dimensions:  8.75” x 1.26” x 1.26” (222 x 32 x 32 mm)
  • Transmitter Dimensions: 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)
  • Housing: Extruded Aluminum, wall thickness .09" (2.3 mm)

Power Source:  Battery, 9-Volt Alkaline (> 45 continuous hours use)


Frequency & Sensitivity Specifications    

  • Distance of Reception:  Up to 150 feet (45 m)
  • 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

Environmental - Operating Temperature Range:  -4° to +130° F (-20° to +54° C)


  • Industrial Grade/600-Ohm Impedance
  • Over or Behind-the-Head (for use with hardhat)
  • 21-24 dB External Noise Attenuation        

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


  • No calibration required.
  • Requalification of performance is recommended once per year