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Model SBEPI is a cost effective triaxial downhole package useful for relatively shallow borehole installations. The unit consists of three EpiSensor force balance accelerometer modules mounted orthogonally in one small convenient package. The diameter of the SBEPI is only 2.625², making it suitable for installation in a 3² diameter hole.
With full-scale recording ranges of ± 0.25 to ± 4g, the SBEPI 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 en-hanced. 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 appro-priate 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.
EpiSensor force balance accelerometers are also available in the HypoSensor deep borehole package, Model FBA ES-DH.
Select Episensor Configuration for your Application
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Low noise |
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Fits in 3" diameter hole |
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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 |
| Cable: |
110-meter cable (in place of the 40 m cable) |
| Wellhead junction box: |
P/N 108390-04-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 140 psi, 67 mm diameter x 250 mm (2.625" x 10" stainless steel ) Provided with attached 40 m cable |
| Weight: |
2.3 kg (5 lbs)(85 lbs. With 40 m cable in shipping container) |
| Ordering Information: |
Specify: Full-scale range, outputs, noise (standard or low) and options, if any |
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