Vibration Sensors
Servo Type sensor
- A motion is sensed by a displacement detector, a current is fed to the coil to get back the pendulum mass to the original position. This current will be proportional to the acceleration, that is converted to an output voltage. The servo type sensor is for the earthquake monitoring or measurements of micro tremor on the civil engineering structures because of its higher sensitivity and stability or more accurate phase responses in the lower frequency range than those of other vibration transducers.
Product lineup
Features
- ■ Detectable down from DC
- ■ Advanced linearity and high resolution
- ■ High sensitivity and large output voltage
- ■ Excellent phase response in low frequency range
- ■ Stable operation because of armature flexure suspension free from friction or fatigue
- ■ Static sensitivity calibration is possible using the gravity acceleration
- ■ Long cable can be used because of the pretty low output impedance
-
[ Frequency response ]
Though the upper frequency limit of the servo sensor should be defined by the natural frequency of the pendurum that is affected by displacement negative feedback, it is actually limited by the installed low pass filter. Lower frequency components can be detected down to DC acceleration. However, lower limit will depend on the integral characteristic of the amplifier in case of convension to velocity or displacement.
-
[ Phase response ]
Phase response of the servo sensor is favorable down from low frequency area (almost DC)
Product lineup
Drip
proofVP-5113 HHV – Fixed on the ground –
Outward dimension PDF■ Specifications
| Sensitivity direction | HHV |
|---|---|
| Maximum measurable acceleration |
29.4 m/s2 |
| Sensitivity | 0.204 V (m/s2) ± 5 % or less |
| Frequency range | DC to 100 Hz |
| Natural frequency | > 400 Hz |
| Linearity | ± 0.1 % full scale |
| Resolution | 4.9 x10-5 m/s2 or less |
| Power supply | DC ± 11 to 16 V |
| Operating temperature range |
－25 to +70 ﾟC |
| Structure | Dust proof, drop proof (equivalemt to IP65) |
| Cable connection | Drip proof packing |
| Material | Aluminum die cast |
| Weight | 5 kg |
| Self test | Equipped |
Water proofGeneral typeVP-9462 HHV – Fixed on the ground –
■ Specifications
| Sensitivity direction | HHV |
|---|---|
| Maximum measurable acceleration | 29.4 m/s2 |
| Sensitivity | 0.204 V (m/s2) ± 5 % or less |
| Frequency range | DC to 100 Hz |
| Natural frequency | > 400 Hz |
| Linearity | ± 0.1 % full scale |
| Resolution | 4.9 x10-5 m/s2 or less |
| Power supply | DC ± 11 to 16 V |
| Operating temperature range | －25 to +70 ﾟC |
| Structure | Water-proof |
| Cable connection | Water-proof packing |
| Material | Brass tube C2700T |
| Weight | 5.5 kg |
| Self test | Equipped |
Water proofGeneral typeVP-9562 HHV – Bore hole type –
■ Specifications
| Sensitivity direction | HHV |
|---|---|
| Maximum measurable acceleration | 29.4 m/s2 |
| Sensitivity | 0.204 V (m/s2) ± 5 % or less |
| Frequency range | DC to 100 Hz |
| Natural frequency | > 400 Hz |
| Linearity | ± 0.1 % full scale |
| Resolution | 4.9 x10-5 m/s2 or less |
| Power supply | DC ± 11 to 16 V |
| Operating temperature range | －25 to +70 ﾟC |
| Structure | Water-proof |
| Cable connection | Water-proof packing |
| Material | Brass tube C2700T |
| Weight | 6.5 kg |
| Self test | Equipped |
Flame proofVP-5232EX – Fixed on the ground –
■ Specifications
| Sensitivity direction | HHV |
|---|---|
| Maximum measurable acceleration | 29.4 m/s2 |
| Sensitivity | 0.204 V (m/s2) ± 5 % |
| Frequency range | DC to 100 Hz |
| Natural frequency | > 250 Hz |
| Linearity | ± 0.1 % full scale |
| Resolution | 4.9 x10-5 m/s2 or less |
| Power supply | DC ± 15 V |
| Operating temperature range | －10 to +60 ﾟC |
| Structure | Flame-proof (Ex db IIB T4) |
| Cable connection | Pressure-resistant packing |
| Material | Aluminum |
| Weight | 5 kg |
| Self test | Equipped |