GVd, GVu, GHa Geophones

Description

Intrinsically safe geophone sensors GVx and GHx of the ARAMIS M/E system designed for measuring the velocity of ground vibrations.

Operating position and mounting type:

  • GVu – vertical operation, mounted on the roof,
  • GVd – vertical operation, mounted on the floor,
  • GHa – horizontal operation.

The PPV version (sensors GVu-P, GVd-P and GHa-P) includes sensitivity limitation of the probe, preventing output signal saturation at ground movement velocities of 1 m/s.

The sensors are intrinsically safe devices of Group I, Category M1.

Specification

Electrical Parameters
Maximum output voltage   Uo = 8 V
Maximum output current   Io = 21 mA
Maximum output power   Po = 0.17 W
Maximum external inductance   Lo = 500 mH
Maximum external capacitance   Co = 1000 μF
Maximum input voltage   Ui = 20 V
Maximum input current   Ii = 80 mA
Maximum input power   Pi = 0.3 W
Maximum internal inductance   Li = 600 mH
Maximum internal capacitance   Ci – negligible
Transmission type   DTSS – pulse digital transmission via power-supply telecom line
Metrological Parameters
Frequency range    
- sensor GVx, GVx-P   4.5 Hz - 1500 Hz
- sensor GHa, GHa-P   4.5 Hz - 1500 Hz
Permissible positioning deviation    
- sensor GVx, GVx-P   ± 7°
- sensor GHa, GHa-P   ± 1°
Mechanical Parameters
Protection rating   IP54
Weight   0.7 kg
Dimensions   135 mm x Φ50 mm
Additional Functions
- Sensor sensitivity memory    
- Brass mounting thread    

Gallery

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