LD20HC Correlator
Correlation is a computer-based method that can be used to detect leaks with a high degree of accuracy.
A sound is generated at each leak point, which travels through the pipe and is transmitted to the hydrants, couplings, or valves. At up to three measurement points, the sound is captured by highly sensitive signal receivers and transmitted to the correlator via an LD radio transmitter.
The LD20HC calculates the exact location of a leak based on the difference in the transit time of these signals, taking into account the material, the pipe diameter, and the length of the measurement path.
While with other electroacoustic methods—especially in the case of long pipelines—it can be difficult to detect leaks due to interfering factors such as weather, pipe depth, or high noise levels—it is nevertheless easy to locate the leak using correlation. such circumstances.
The LD20HC combines high-quality engineering—”Made in Germany”—with the latest technology for detecting leaks in pipelines or drinking water networks, making it the ideal standard equipment for water utilities and metrology service providers.
At the leak points, water escapes under pressure, creating flow noise that travels in both directions through the pipes, which is detected by highly sensitive sensors that can be installed in accessible locations, such as fire hydrants or valves.
Since the type of water pipe always affects sound propagation, the LD20HC allows you to specify the material and diameter of all pipes, and you can examine up to 20 pipe sections in a single measurement operation.
The recorded signal is amplified and transmitted via radio to the correlator, which allows 256 freely selectable filters to be applied to the signal.
It can also be used to detect acoustic leaks and pipes
Various structure-borne or floor microphones can also be connected to the LD20HC for listening. When used with a floor microphone, the leak location previously determined by correlation can be verified. In addition, all other types of acoustic leak detection and pipe location can be performed.
Thanks to the patent-pending Smart feature, you can see what’s important right on the screen: potential leak locations are displayed as bar graphs, and the steepest drop indicates the leak location. There’s no faster or easier way to detect leaks acoustically!
Advantages:
- Combined device for measuring correlation and detecting acoustic leakage
- Advanced measurement technology with an ultra-fast 6-core processor in a sturdy aluminum housing
- 64-bit three-point correlation
- Frequency Analysis (FFT)
- The material and diameter of the pipe sections to be measured can be specified
- Time-efficient correlation measurement of up to 20 pipe sections in a single measurement run
- An innovative smart feature for even faster acoustic point detection (patent pending)
- User-friendly interface with control via two touchscreens
- Highly sensitive audio receivers and powerful radio transmitters—more than 60,000 times the amplification
- Connector for the body and floor microphones
Technical details:
- Operating modes: Correlation leak detection (automatic, manual); Acoustic leak detection (F & L, Smart)
- Measurement and device features: automatic filter adjustment, automatic gain control, memory function for manual filter settings, audio level overload protection
- Measurement resolution (correlation): 5 cm at a measurement distance of 100 m
- Measurement resolution (acoustic leakage detection): 0–99 units (corresponds to dB)
- Controls: touchscreen or buttons and rotary controls
- Amplifier: 120 dB with low noise figure
- Input resistance: 1 MOhm
- Filter: 256 high-pass and low-pass filters
- Frequency range: 0–5,000 Hz (correlation); 0–4,000 Hz (acoustic leakage detection)
- Display: color LCD (5.7 inches) with backlight
- Battery Control via a Microcontroller
- Output impedance: <10 ohms
- Power supply: built-in Ni-MH battery, 8,500 mAh
- Operating time: over 10 hours of continuous operation on a single charge
- Memory: up to 100 measurements per operating mode
- Connections: 2x SMA antenna ports, bayonet connector (IP65), 4-pin charging port with cover (IP65), 3-pin headphone jack with cover (IP65), USB cable port with cover (IP65)
- Menu languages: German, English, French, Italian, Portuguese, Polish, Swedish, Russian, Turkish, Croatian, Slovenian, Slovak, Chinese
- Protection Class: IP65
- Housing: aluminum, powder-coated
- Dimensions (W x L x H): 380 x 155 x 67 mm
- Weight: 2300 g
Standard package contents:
- LD20HC Correlator with Two Antennas and a Carrying Strap
- LD K – Noise-Canceling Headphones
- Charger
- LD-TA transmitter 1, including audio pickup, color: red
- LD-TB transmitter, 2-piece set including microphone, yellow
- Carrying Case for Measuring Instruments, LD-TA, LD-TB, and Accessories
Optional accessories available for order:
- LD-TC Transmitter 3, including audio pickup, color: blue
- LD20 MA – Magnetic-base antenna for a correlated receiver
- LD20 MA + – Magnetic Ground Antenna for a Correlator with Amplification (4 dB gain)
- LD20 hydrophone without a pressure gauge
- LD20 Hydro UF – Adapter for a hydrophone, with a DIN hydrant coupling featuring a 1-inch internal thread and a slide lock for installation
- LD6000 VK Connection Cable for Ground Microphones
- LD6000 BMW – Wind-protected surface-mounted microphone (with dead man’s switch)
- LD6000 BM – Universal Microphone with Magnetic Adapter
- LD6000 DA Tripod Adapter
- LD6000 VL – Probe Extension with Tip
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