Low noise hydrophone mod. GP1280
Low-noise preamplified omnidirectional hydrophone (“below sea state zero”). It is a highly professional instrument, suitable for a wide range of applications in the field of underwater acoustics. The hydrophone’s high sensitivity, together with the low voltage noise of its highly customizable preamplifier, make it particularly suitable for working in the field of bioacoustics, for environmental noise measurements and for the acoustic characterization of sources in the 5 Hz – 90 kHz frequency range. GP1280 Standard and GP1280MR are two versions of the same hydrophone. GP1280MR is designed for long-term deployments, with a resin-steel body that reduces exposed metal and a direct cable connection via pigtail. Compare the specifications of both versions below.
Features of the omnidirectional hydrophone
• High sensitivity
• Low noise “sea state zero”
• Highly customizable preamplifier
• Wide usable frequency range
• Double output: single/differential
• Calibration input
• High materials quality
• GP1280MR version for long-term deployments
GP1280 Standard and GP1280MR technical specifications
GP1280 Standard and GP1280MR are two versions of the same hydrophone. The values below refer to the corresponding manufacturer datasheets.
| Parameter | GP1280 Standard | GP1280MR |
|---|---|---|
| Working band | 5 Hz – 90 kHz | 5 Hz – 90 kHz |
| High-pass filter on preamplifier | Customizable on request | Customizable on request |
| Balanced output sensitivity at 5 kHz | -163 dB re 1 V/µPa (customizable) | -163 dB re 1 V/µPa (customizable) |
| Single output sensitivity at 5 kHz | -169 dB re 1 V/µPa (customizable) | -169 dB re 1 V/µPa (customizable) |
| Directivity | Spherical – Omnidirectional | Spherical – Omnidirectional |
| Maximum working depth | 900 m | 1,000 m |
| Gain at 5 kHz | 30 dB (single), 36 dB (balanced) | 30 dB (single), 36 dB (balanced) |
| Equivalent input acoustic noise at 5 kHz | 31 dB re 1 µPa/√Hz | 32 dB re 1 µPa/√Hz |
| Input impedance | 10 MΩ | 10 MΩ |
| Supply voltage range | 11.5 – 30 Vdc | 11.5 – 30 Vdc |
| Current consumption at 12 Vdc | 9 mA | 13 mA |
| Output voltage swing | 6 Vpp (single), 12 Vpp (balanced) | 6 Vpp (single), 12 Vpp (balanced) |
| Weight in air | 500 g | 200 g |
| Body construction | Stainless steel AISI 316 or PPSGF40 + internal steel core | Stainless steel AISI 316 or POMC + internal steel core |
| Dimensions | 233.25 × 33.5 mm | 165 × 33.5 mm |
| Packaging | Pelicase mod. 1170 | Preformed foam |
Reference datasheets: GP1280 Standard (PDF) · GP1280MR (PDF).
Accessories and optional configurations
- Protective frame, with an optional suspension system for vibration damping.
- Portable receiving unit with adjustable gain, rechargeable battery, audio and headphone outputs, and calibration signal.
- Low Power configuration: 3.1 – 5.5 Vdc supply, current consumption <5 mA.
- Custom cable lengths and connectors.
The GP1280 Standard datasheet also lists a modified body for ultra-deep applications up to 2,800 m and a reinforced resin body for long-term deployments. These are optional configurations; the maximum working depths of the two versions shown in the table are 900 m and 1,000 m respectively.
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