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Uniaxial
Force Balanced Velocity meter/ Accelerometer
Model
EV-12
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The EV-12 is a high sensitivity uniaxial force balance sensor
with both velocity and acceleration outputs.
Unlike piezo type sensors, the servo force balance construction offers
acceleration frequency to DC. The velocity output has a frequency
range of 0.5Hz to 70Hz. It offers low noise, high dynamic range, and
is perfectly suited for most strong motion monitoring applications.
The unit can be used either as in horizontal or vertical orientations*.
The EV-12 standard packaging is a small 2-inch cube field case with
mounting plate and connector. 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 EV-12 does not experience significant drifting
with temperature changes.
Options include a single side voltage input with differential output
for long sensor run applications.
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FEATURES
- Acceleration
and Velocity Outputs
- Low Noise
- Low Power
- Rugged
- High Sensitivity
- Borehole Configurations
- Over 120dB
Dynamic Range
- Maintenance
Free
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SPECIFICATIONS |
| HIGH SENSITIVITY VELOCITY OUTPUT |
| Operating principle: |
Uniaxial Servo Force
Balanced design, can be used for horizontal or vertical mounting* |
| Frequency range: |
0.5Hz to 100Hz ±3 dB
(damping 70% critical) |
| Measuring range: |
±10 kine (4 IPS) |
| Voltage Sensitivity:
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at least 1V/Kine (2.54
V/ IPS) |
| Spectral Noise ( for
1/3 octave band ): |
1 ~ 70 Hz, < 20i kine
( rms ) |
| HIGH SENSITIVITY
ACCELERATION OUTPUT |
| Operating principle: |
Uniaxial Servo Force
Balanced design, can be used for horizontal or vertical mounting* |
| Frequency range: |
DC to 100 Hz +1dB,
-3dB |
| Measuring range: |
±2 g |
| Voltage Sensitivity:
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5 V/g |
| Spectral Noise ( for
1/3 octave band ): |
1 to 100 Hz, < 1i g
(µg) (rms) |
| Dynamic Range: |
> 120dB |
HOW
TO ORDER
| BasicEV-12 Configuration |
The standard configuration
includes field enclosure, circular connector on case and calibration
sheets |
| Single sided voltage input with differential
output |
option -DO |
| Crossaxis (0.005 g/g) |
option -CA5 |
| *Vertical biased for earth's gravity |
*option -B (Vertical mounting only) |
| Custom Packaging |
specify |
| Recorder Options |
SMR-4000
SMR-6102 |
| Supplies and Accessories |
Sensor Cable
Mating Connector
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| General Spares |
None |
S Printer
Friendly Format For Specifications
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ENVIRONMENTAL |
| Waterproof: |
Not submersible |
| Operation Temperature
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-10° to 50° C |
| Vibration Survival |
10 g p-p, 2 to 2,000
Hz |
| Shock Survival |
1000 g, 1 ms 100 g,
11 ms |
| Humidity |
95% R.H. |
| MECHANICAL |
Housing Standard
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Environmental Field
Enclosure. |
| Size |
2" cube with mounting
plate and circular connector |
| Weight (Al housing) |
250 grams |
| Connector |
Mates with PT06A-10-6S |
| POWER |
| Power - Standard |
± 12V typ. others optional |
| Supply current |
30 ma |
| NOISE CURVE |
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Specifications
Subject to Change Without Notice |
| ©eentec 2000, 2003 |
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