Chapter 8. Specifications
Hybrid sensors | Velocity output bandwidth | 0.1 – 50 Hz |
| High pass filter output flat to acceleration | 0.01 Hz – spec* |
| High pass filter output flat to velocity | spec – 50 Hz* |
| Mass position output | DC – 0.1 Hz |
| Velocity sensitivity | 1400 V/ms-1 |
| Acceleration sensitivity | 2000 V/ms-2 |
Velocity sensors | Velocity output bandwidth | spec – 50 / 100 Hz* |
| Mass position output | DC – spec Hz* |
| Velocity sensitivity | 2 × 1000 V/ms-1** |
| Mass position sensitivity | 1000 V/ms-2 |
Controls | Mass locking and unlocking | remotely operated |
| Mass centring | 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 | Waterproof, bayonet | |
Borehole diameter | 89 – 229 mm | |
| Temperature range (masses locked) | –20 to +75 °C |
| Operational temperature range | –10 to +65 °C |
Power | Supply requirements | 11 – 36 V DC |
| Current at 24 V DC | 75 mA† |
| Current at 24 V DC during centring (average) | 115 mA† |
| Current at 24 V DC during locking and unlocking | 200 mA† |
See following notes:
* 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/ms-1
† Because centring, locking, and unlocking consume varying amounts of power, it is recommended that you use a power supply capable of delivering 1 A at 12 V.