Guralp Systems Limited

PreviousNext

1. Introduction 2. First encounters 3. Installing in a borehole 4. Calibrating the 3V / 3ESPV 5. Inside the 3V / 3ESPV 6. Connector pinouts 7. Specifications 8. Revision history

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.

PreviousNext

1. Introduction 2. First encounters 3. Installing in a borehole 4. Calibrating the 3V / 3ESPV 5. Inside the 3V / 3ESPV 6. Connector pinouts 7. Specifications 8. Revision history