Amprobe ULD-420 Ultrasonic Leak Detector

  • Transmitter generates an ultrasonic signal when working in unpressurized systems
  • Three Receiver filters to remove main noise frequencies in noisy environments
  • Adjustable Receiver sensitivity for accurate leak pinpointing
  • 20 kHz to 90 kHz frequency range: optimal range for detecting a variety of leakage events
  • 2.5” LCD display with bargraph
  • Quality headphones to help identify the source of the leak
  • Parabola accessory directs the ultrasound towards the sensor
  • Detachable Tubular Extension provides additional reach in hard to reach areas

SKU: 5117474 Category:


When equipment begins to fail due to an air or gas leak or vibration, or electrical discharge, the leakage point emits an ultrasonic sound wave that is above the natural range of human hearing. The ULD-420 Ultrasonic Leak Detector converts this ultrasonic sound into a signal that can be used to pinpoint the exact location of the equipment failure. When working in unpressurized systems or the pressure is not sufficient enough to detect or verify a leak with the Receiver alone use the Transmitter.


Winner – Tool Innovation Awards – Test & Measurement-Leak Detection

Additional information



ULD-400-R Receiver ULD-400-T Transmitter
Sensitivity Adjustment Yes N/A
Volume Adjustment Yes N/A
Signal Level Adjustment N/A Yes
Earphone Jack (3.5 mm) Yes N/A
Display Size LCD 2.5 in (6.35 cm) N/A
Display Dimensions 1.45 x 1.93 in (36.72 x 48.96 mm) N/A
Display Resolution 240(RGB) x 320 pixels N/A
Display Type TFT-LCD (262 K) N/A
Display Color True, 16bit/color N/A
Frequency Range 20 kHz to 90 kHz Typical 40 kHz squarewave
Filter ±5 KHz of main noise frequency, up to three filters N/A
Power Supply 4 x 1.5 V AA (LR6) alkaline batteries 2 x 1.5 V AAA (LR03) alkaline batteries
Power Consumption (typical) 75 mA 33 mA
Battery Life (typical) 105 hours (Alkaline) 60 hours (Alkaline)
Low Battery Indication Yes (Red LED)
Weight Approx. 0.518 lb (0.235 kg) Approx. 0.335 lb (0.152 kg)
Dimensions 7.547 x 2.984 x 1.791 in
(183 x 75 x 43 mm)
5.295 x 2.559 x 1.326 in
(137 x 65 x 33 mm)
APO function 60 minutes when in idle
Operating Temperature -4 °F to 122 °F (-20 °C to 50 °C)
Storage Temperature -4 °F to 158 °F (-20 °C to 70 °C)
Operating Humidity <80% RH
Pollution Degree 2
Protection IP40
Electromagnetic Compatibility (EMC) EN 61326-1
Korea (KCC): Class A Equipment (Industrial Broadcasting & Communication Equipment) [1]
[1] This product meets requirements for industrial (Class A) electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and is not to be used in homes.


ULD-400 Series Overview

Find ultrasonic leaks easily with the ULD-400 Series Ultrasonic Leak Detectors.


ULD-400 Series Adjusting Signal Strength

Learn how to pinpoint leaks by adjusting Receiver sensitivity.


ULD-400 Series Noise Filter

The Receiver will automatically detect and and filter out up to three main noise frequencies.


ULD-400 Series De-pressurized Systems

Use the Transmitter to emit an ultrasonic sound readable by the Receiver in systems without significant pressure.

What's Included

  • Receiver
  • Transmitter
  • Headphones
  • Earbuds (for use with hard hat)
  • PB-1 Power Parabola
  • TEA-1 Flexible Tubing Adapter
  • TE-1 Tubular Extension
  • Hard Carrying Case
  • 4 x AA Batteries
  • 2 x AAA Batteries


Datasheet »
Datasheet – Spanish »
User Manual »


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