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 Model FBA ES-DH is a triaxial downhole package useful for deep borehole installations. The unit consists of three EpiSensor force balance accelerometer modules mounted orthogonally in one small convenient package.
With full-scale recording ranges of ± 0.25 to ± 4g, the HypoSensor provides on-scale recording of earthquake motions even at near-fault locations.
The significant bandwidth of DC to 200 Hz allows engineers and scientists to study motions at higher frequencies while maintaining the very important DC response that allows simple field calibration and reduces post-processing confusion.
Output circuitry is also significantly enhanced. Four types of outputs can be selected by the user: ± 2.5V single-ended, ± 10V single-ended, ± 5V differential or ± 20V differential. The ± 2.5V single-ended output is appropriate for use with traditional Kinemetrics earthquake recording instruments. The ± 10V single-ended output and ± 20V differential output are well suited for use with a wide range of digital recorders currently on the market. HypoSensor force balance accelerometers are also available in the Model SBEPI shallow borehole package.
Select Episensor Configuration for your Application
HypoSensor PDF Download
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Low noise |
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Extended bandwidth – DC to 200 Hz |
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Factory-selectable full-scale range |
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Calibration coil (standard) |
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Single-end or differential output (user selectable) |
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Double-stage transient protection |
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Single 12Vdc supply |
| Internal compass: |
P/N 110501-PL |
| Wellhead junction box: |
P/N 108390-04-PL |
| EPRI-Youd Wedging System: |
PN 108365-PL |
| Yoke adapter for loading poles: |
PN 105080-PL |
| Master orientation pole: |
P/N 105060-PL |
| Loading pole (10 ft extens. Pole): |
P/N 105071-PL |
| Loading pole clamp: |
P/N 105075-PL |
| Centering spiders: |
P/N 108369-PL |
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| Dynamic range: |
155 dB+ |
| Bandwidth: |
DC to 200 Hz |
| Calibration coil: |
Standard |
| Full-scale range: |
Factory-selectable at ± 0.25g, ± 0.5g, ± 1g, ± 2g or ± 4g |
| Outputs (user selectable at): |
± 2.5V single-ended |
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± 10V single-ended |
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± 5V differential |
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± 20V differential |
| Linearity: |
< 1000 µ g/g2 |
| Hysteresis: |
< 0.1% of full scale |
| Cross-axis sensitivity: |
< 1% (including misalignment) |
| Zero point thermal drift: |
< 500 µ g/°C (1g sensor) |
| Power consumption: |
12mA from +/- 12V (Standard Amp) |
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35mA from +/- 12V(Low Noise Amp) |
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Single supply option available |
| Operating Temperature: |
-20° to 70°C (0° to 160°F) |
| Housing: |
Watertight to 1000 psi, 75 mm diameter x 470 mm (3" x 18 ¾" stainless steel type 316) |
| Weight: |
6 kg (13 ¼ lbs) |
| Ordering Information: |
Mating connector and cable, P/N 700306-XXX (-XXX: Must specify desired cable length.) |
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