It is now widely accepted that at sites with high ground noise, measurement conditions can be considerably improved by using a downhole seismometer. For those who seek the best possible solution for a challenging site, we offer two perfectly suited instruments: The LE-3D/BH and the simplified version LE-3D/BHs.
Essential features and characteristics:
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robust instrument
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stainless steel casing
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protection class IP68
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small diameter (62 mm)
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very low power consumption (<6 mA @ 12 V DC)
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uniform sensitivity and transfer function
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oriented installation with holelock possible
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also available as 'sand' version (LE-3D/BHs)
The most important characteristics:
| Eigenperiod | 1 second |
| Upper frequency limit | 100 Hz |
| Transduction factor | 800 V/(m/s) (differential) |
| Output signal | 3 analog voltages, max. +- 7V |
| Power supply | +10 ... +16V DC, typically 6 mA @12 V |
| Dimensions | 62 mm diameter, 880 or 1080 mm length |
| Weight | 9 kg |
| Temperature range | -15 ... +60 °C |
| RMS noise @ 1 Hz | < 1 nm/s |
| Dynamic range | > 136 dB |
