Borehole Geophone
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| CDJ-JC | CDJ-QJS | ||
| Velocity borehole geophone series | Sealed borehole geophone series | ||
| Frequency (Hz) | 4HZ-100HZ optional | 4HZ-100HZ optional | |
| Minimum appropriate borehole diameter (mm) | φ50 | φ45 | |
| Operating temperature (℃) | -25~+55 | -25~+55 | |
| Size | Diameter (mm) | φ45 | φ40 |
| Length of single probe (mm) | 210 | 150 | |
| Cable length | optional | optional | |
| Distance between probes | optional | optional | |
| Weight (kg) | 22kg~60kg | 20kg~36kg | |
- Light weight, great waterproof capability and nice resolution.
- Optional numbers of channels: 6, 12, 24 and 60.
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