Chapter 7. Specifications
Velocity sensors | Velocity output bandwidth | spec – 100 Hz* |
Mass position output | DC – spec Hz* | |
Velocity sensitivity | 2 × 1,000 V/ms⁻¹** | |
Mass position sensitivity | 1,000 V/ms⁻² | |
Controls | Gimbal locking and unlocking | Automatic, microprocessor controlled |
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 Volts D.C. |
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 seconds (= 0.033 Hz).
** Sensors are available with a range of sensitivities between 2 × 750 and 2 × 10,000 V/ms⁻¹.