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 200C 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.
Standard natural frequencies are 8, 10, 14, and 30 Hz. Coil resistance is 1850 ohms. All units are available in both vertical and horizontal models, and are ideal for VSP, tri-axial and gimbal downhole operations.
Natural Frequency : 8.0 } 0.5 Hz, 10.0 } 0.5 Hz, 14.0 } 0.7 Hz, 30.0 } 1.5 Hz
Coil Resistance } 5% : 1850 ohms
Intrinsic Sensitivity } 5% : 0.40 V/cm/sec (1.02 V/in/sec)
Open Circuit Damping } 10% : 0.70 (8Hz, 10Hz), 0.50 (14Hz), 0.22 (30Hz)
Total Harmonic Distortion : Less than 1% at 12 Hz or natural frequency whichever is larger
Maximum Tilt Within Specifications : 10(V)/ 3(H) (8Hz), 20(V)/ 5(H), (10Hz), 30(V)/10(H), (14Hz),
180(V/H), (30Hz)
Temperature Limits : -40F to 392F (-40C to 200C)
All specifications apply to measurements made after a heat cycle of 200C and after unit returns to room temperature (20C). Units will operate at larger tilt angles, but performance will not necessarily meet specifications.
Maximum Coil Excursion : 0.12 in P-P (3.0 mm P-P)
Suspended Mass : 0.23 oz. (6.6 g)
Dimensions :
Diameter : 0.875 in (22.2 mm)
Height : 1.04 in (26.4mm)
Weight : 1.52 oz. (43g)
Chart for Seismic Detector Response Curve Output VS. Frequency (SMC-1850 @ 10 Hz & SMC-1850 @ 14 Hz
Specifications are subject to change without notice.