Optional accessories available
| Parameter | Value |
| Transmitter | |
| Display | numeric and graphic sound level |
| Amplifier stages | The device comes with 3 amplifier stages: •  No. 1: pre-preamplifier •  No. 2: preamplifier •  No. 3: post-amplifier |
| Filter function | The device comes with 5 filter functions: •  open = 0–5000 Hz •  low = 0–300 Hz •  medium = 200–800 Hz •  high = 600–1400 Hz •  very high = 1000–4000 Hz |
| Amplification | Automatic pre- and post- amplification, -10 to +10 steps manually adjustable for pre- amplification |
| 5 preset filter ranges | |
| Transmission power | 500 mW maximum |
| Frequency bands | Channel A: 433.7 MHz Channel B: 434.7 MHz Channel C: 434.0 MHz |
| Background illumination | Automatic |
| Temperature conditions | Operation: -20 °C to +60 °C |
| Storage: -25 °C to +65 °C | |
| Power supply | integrated NiMH battery |
| Dimensions (length x width x height) |
approx. 175 x 165 x 155 mm |
| Structure-borne sound sensors | |
| Sound receiver | Piezoceramic |
| Connections | TNC antenna connection bayonet sensor connection 4-pin charging socket with cover 3-pin headphone connection with cover |
| Type of protection | IP68 |
| Housing | aluminium, powder-coated |
| Operating time | approx. 7 h in continuous operation with fully charged battery |
| Weight | approx. 2,900 g |
| Parameter | Value |
| Receiver | |
| Operating modes | Leak detection via correlation (automatic, manual) acoustic leak detection (volume, smart) |
| Measuring and device functions | automatic filter adjustment, automatic amplification, preference memory function for manual filter settings, sound level override protection |
| Measurement resolution correlation | 5 cm for a measuring distance of 100 m |
| Measurement resolution geophone | 0–99 digits (equivalent to dB) |
| Control | optionally via touchscreen or buttons and control dial |
| Amplification | 120 dB with low noise figure |
| Input impedance | 1 MΩ |
| Filter | 256 high-pass and low-pass filters |
| Display | 5.7″ touch colour LCD with background illumination |
| battery check | via micro controller |
| Output impedance | < 10 Ω |
| Power supply | integrated NiMH battery, 8500 mAh |
| Operating time | approx. 10 h in continuous operation with fully charged battery |
| Memory | up to 100 measurements per operating mode |
| Connections | 2 x SMA antenna sockets bayonet sensor connection 4-pin charging socket with cover 3-pin headphone connection with cover USB cable connection with cover |
| Type of protection | IP65 |
| Housing | aluminium, powder-coated |
| Temperature conditions | Operation: -20 °C to +60 °C |
| Storage: -25 °C to +65 °C | |
| Dimensions (length x width x height) |
approx. 380 x 155 x 67 mm |
| Weight | approx. 2,300 g |
The LD20HC uses computer-assisted correlation to determine leak positions with maximum precision – even under difficult conditions. Every leak generates a characteristic flow noise that propagates through the pipe network and is recorded at up to three measuring points by highly sensitive sensors. These signals are transmitted by radio to the correlator, which calculates the exact leak position from the time differences, taking into account pipe material, diameter and measuring distance. While conventional electroacoustic methods often reach their limits due to noise, weather or pipe depth, the LD20HC reliably delivers precise results even on long pipeline sections. With German-engineered quality, up to 20 definable pipe sections per measurement, 256 selectable filters, Smart display guidance and the option to connect ground and body microphones for verification and acoustic listening, the LD20HC is the ideal standard solution for professional leak detection in water supply networks.
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