Chapter 7. Specifications
Velocity sensors | Velocity output bandwidth | spec – 100 Hz* | |
| Mass position output | DC – spec Hz* | |
| Velocity sensitivity | 2 × 1000 V/m/s** | |
| Mass position sensitivity | 1000 V/m/s2 | |
Controls | Mass locking and unlocking | remotely operated | |
| Mass centring | automatic, microprocessor controlled | |
Mechanics and electronics | Sensors | 3 orthogonal sensors, each 0.180 kg | |
| Lowest spurious resonance | above 140 Hz | |
| Sensor transducer type | capacitive displacement | |
| Feedback transducer type | magnet/coil | |
Connector | pressure tight, waterproof | ||
Borehole diameter | 89 – 229 mm | ||
| Temperature range with masses locked | –20 to +75 °C | |
| Operational temperature range | –10 to +65 °C | |
Power | Supply requirements | 12 – 30 V DC | |
| Current at 24 V DC | 75 mA† | |
*spec refers to the quoted frequency response value, e.g., for a “30 s” sensor, the value of spec would be 30 s = 0.033 Hz.
**Sensors are available with a range of sensitivities between 2 × 750 and 2 × 10,000 V/m/s.