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Ultra
Low Noise
Force Balanced Accelerometer
Model
EA-140
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The EA-140 occupies the high-end range of the Servo Force
Balance Accelerometer line. It offers very low noise, high dynamic
range, in a frequency band of DC to 50 Hz. It is suited for specialized
strong motion monitoring applications.
The EA-140 standard packaging is an open-ended 3 1/4 inch plate that
can be mounted internally in the SMR recorder or the R-1 Triaxial
Rotational Sensor. Optional freestanding field or borehole packages
are available.
The sensor elements are housed in an epoxy sealed aluminum case. They
are extremely rugged, and designed for long-term deployment in field
environments. Unlike solid-state type accelerometers, the EA-140 does
not experience significant drifting with temperature changes.
Options include a variety of full-scale "g" levels, user selectable
full-scale "g" ranges, and other frequency bands
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FEATURES
- Very Low Noise
- Wide Temperature Range
- Low Power
- Rugged
- Optional Full Scale g levels
- Optional Passbands
- Borehole Configurations
- 148dB Dynamic Range
- Maintenance Free
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SPECIFICATIONS |
GENERAL |
Operating principle: |
Force balanced servo accelerometer |
Full Scale
Optional |
±2 g standard
±0.5 g to ±5 g, user selectable |
Dynamic Range |
142 dB ± 5V
148 dB ± 10V |
Frequency
Optional |
DC to 50 Hz +1, -3 dB
DC to 100 Hz or 200 Hz
(damping 70% critical) |
Output Signal Swing |
0.5 to 4.5 V or ±2.5V, ±5 V,
or ± 10 V |
Resolution (at ±10 V) |
0.1 µg @ 1g
0.2 µg @ 2g |
Zero G bias |
± 0.01g, optional electronic adjustment |
Linearity |
± 0.2% FS over temperature range
(0.1% opt) |
Cross Axis Sensitivity |
0.02 g/g (0.005 g/g option) |
HOW
TO ORDER
BasicEA-140 Configuration |
The standard configuration
includes flying leads and calibration sheets |
Extended g range |
option -xg
(x specifies g)
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Frequency Option |
option -Fxxx
(x specifies frequency) |
Electronic Zero Bias |
option -ZB |
Linearity (0.1%) |
option -L01 |
Crossaxis (0.005 g/g) |
option -CA5 |
Supply Voltage |
option -PWxx
(x specify voltage) |
Full Scale Output Volt |
specify |
Packaging |
specify |
Recorder Options |
SMR-4000
SMR-6102 |
Supplies and Accessories |
Sensor Cable |
General Spares |
None |
S Printer
Friendly Format For Specifications
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ENVIRONMENTAL |
Waterproof: |
Optional field case |
Operation Temperature |
-10° to 75° C (opt SS +85° C) |
Vibration Survival |
10 g RMS, 2 to 2,000 Hz |
Shock Survival |
1000 g, 1 ms 100 g, 11 ms |
Humidity |
95% R.H. (opt. SS 100%R.H.) |
MECHANICAL |
Housing Standard
Optional |
Open Internal Mount 3.25" plate
appx. Field Enclosure, SS (stainless steel), Borehole |
Sensor Element: |
1.25"H x 1"Diam |
Weight (Al housing) |
Package dependent |
Connector |
Package defendant |
POWER |
Power - Standard |
± 12V typ. others optional |
Supply current |
30 ma (triaxial) |
NOISE CURVE |
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Specifications Subject
to Change Without Notice |
©eentec 2000, 2003 |
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