Geophones SMC-1850


High Temperature Geophone

>All units tested at 200° C
>Ideal for VSP, tri-axial and gimbal downhole operations
>Full one year warranty
>Small size, high output
>Patented PCB header
>100% burn-in of basic units

The SMC-1850 High Temperature Geophone has been tested at 200°C for more than 300 hours with no loss in performance specifications. Its design structure and super strength magnetic field makes the output of this small geophone equal to or greater than the output of larger units. Rotating dual coil construction withstands severe shocks and rough handling. The patented PCB header provides easy and reliable electrical connections.

Spec Sheet:

SMC-1850 Specifications

Natural Frequency (Fn) ± 5%               10.0 Hz            14.0 Hz            15.0 Hz           30.0 Hz

Operating Position                           Vert – Horz        Vert – Horz       Vert – Horz       Vert – Horz

Maximum Tilt Within Specifications       20° – 5°           30° – 10°         0° – 180°          0° – 180°

Coil Resistance ± 5%                       1850 ohms

Intrinsic Sensitivity ± 5%                  .402 V/cm/sec (1.02 V/in/sec)

Total Harmonic Distortion                 Less than 1% at 12 Hz or natural frequency whichever is larger.

Temperature Limits                         -40°F to 392°F (-40°C to 200°C)

Maximum Coil Excursion                  0.12 in P-P (3.0 mm P-P)

Suspended Mass                             0.23 oz. (6.6 g)


Diameter:                                        0.875 in (22.2 mm)

Height:                                          1.04 in (26.4mm)

Weight:                                         1.52 oz. (43g)

Note: For testing on SMT-200 Geophone Tester, the frequency, resistance and damping tolerances entered must be 1% greater than the published specification above. Sensitivity tolerance entered must be 2% greater than the published specification.

All specifications apply to measurements made after a heat cycle of 200°C and after unit returns to room temperature (25°C). Units will operate at larger tilt angles, but performance will not necessarily meet specifications. Note: The SMC-1850 is NOT hermetically sealed.

SMC-1850 @ 10 Hz

Specifications are subject to change without notice. 

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