Chapter 7. 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/m/s
		Acceleration sensitivity	2000 V/m/s2
Velocity sensors		Velocity output bandwidth	spec – 50 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
	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		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†

*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.

†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.