Description
Subsurface LD-18 Digital Water Leak Detector
The new LD-18 Digital Water Leak Detector is the first water leak detecting instrument to offer automatic noise reduction from intermittent interfering noises, like passing vehicles, people talking, and pedestrian footsteps.
This leak detector finds leaks quickly and easily. Amplifier easily identifies leak sounds.
All-digital amplifier with automatic noise reduction of environmental sounds, high and low filters, storage and graphing of leak noises at different locations on pipe.
Uses bar graph and numeric display of sound loudness, USB connection, and back light. Five High Frequency filters, Three Low Frequency filters(plus Low filter OFF), and 2 Notch filters(plus Notch filter OFF) to remove continuous interfering noises.
LD-18 Amplifier showing filter settings, bar graph and numeric display of sound loudness, and minimum sound level detected.
Automatic noise reduction capability for intermittent noises such as pedestrian footsteps, people talking, and passing vehicles.
5 High Frequency filters, 3 Low Frequency filters (plus Low filter OFF), and 2 Notch filters (plus Notch filter OFF) to remove continuous interfering noises from A/C hum, motors, wind, etc.
The “Saved” data file shows 10 leak sound levels and a graphical display. The leak is at the peak sound level in the center.
With the Minimum Noise Levels saved at 5 – 10 spots directly over the pipe, examine the GRAPH by pressing FILE twice.
The Minimum Noise Level at each spot is the actual leak sound, and where it reaches a peak is where the leak is pinpointed.
Key Features
- All-digital amplifier with automatic noise reduction of intermittent sounds, high and low filters, storage and graphing of sound levels at different locations on the pipe, bar graph and numeric display of sound loudness, USB connection, and back light.
- Automatic noise reduction capability for intermittent noises such as pedestrian footsteps, people talking, and passing vehicles.
- 5 High Frequency filters, 3 Low Frequency filters (plus Low filter OFF), and 2 Notch filters (plus Notch filter OFF) to remove continuous interfering noises from A/C hum, motors, wind, etc.
- Storage and graphical display of the leak‘s loudness at multiple locations along the pipe.
Pinpoint Water Leaks with the LD-18
Example 1: Iron Pipe, 75 Psi, 10 GPM Leak, 5 ft. Depth
Example 2: PVC Pipe, 50 Psi, 1 GPM Leak, 3 ft. Depth
2. Before listening on the asphalt or concrete over the pipe, always listen at hydrants, valves, and meters within 100 – 200 ft. of the suspected leak area:
3. Mark out the locations of the pipes and listen directly over them:
4. At spot no. 1, do you hear the leak? If ‘Yes,’ then the LD-18 hears it as well. Hold the Mute Switch and allow the LD-18 to listen for 30–60 seconds, or longer, until the Minimum Noise Level stabilizes. While still holding the Mute Switch, press the SAVE button.
Repeat this process at 5–10 locations directly above the pipe. The spots may be spaced as close as 6 inches or as far as 3 feet apart, but the LD-18 must still be able to detect the leak.
5. Each time you press the SAVE button (while holding the Mute Switch), the LD-18 records the Minimum Noise Level and assigns it a file number. Press FILE once to view the File List, and press FILE again to display the GRAPH.
6. With the Minimum Noise Levels saved at 5 – 10 spots directly over the pipe, examine the GRAPH by pressing FILE twice:
The Minimum Noise Level at each spot is the actual leak sound, and where it reaches a peak is where the leak is pinpointed.
7. The Band Pass Filters (HI and LO Filters) and Notch Filters (Off, 50 Hz, 60 Hz) are used for removing extraneous continuous noises like AC hum (60 Hz in USA), motors, air conditioners, wind, and traffic. Extraneous noises can interfere with the LD-18’s ability to hear the leak sounds.
8. The Noise Reduction function removes intermittent noises like footsteps, passing cars, and dogs barking. Choose Lv.3 (3.0 sec.) to remove the longest lasting intermittent noises, up to 3.0 seconds long. Intermittent noises longer than 3.0 seconds cannot be removed.
