Horizontal geophone PS-4.5B1

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Overview
4.5Hz Series geophones belong to the low-frequency series, primarily including four models: 4.5B1, 4.5C1, 4.5D, and 4.5F. Models 4.5B and 4.5B1 are standard-sensitivity types, 4.5C1 is a high-sensitivity type, and 4.5F is designed for high spurious-frequency environments. Suitable for geophysical exploration, engineering vibration monitoring, and handheld vibration meters.

Product Category
Low frequency (≤4.5 Hz), passive geophones

Models

• 4.5B1 (standard sensitivity)
• 4.5C1 (high sensitivity)
• 4.5D
• 4.5F (high spurious frequency)

Models and Key Parameters (table)
Parameter | PS-4.5B1 | PS-4.5C1 | PS-4.5D | PS-4.5F | VAS-100 | VAS-200 | VAS-300
Natural Frequency (Hz) | 4.5±10% | 4.5±0.5 | 4.5±0.5 | 4.5±10% | 4.5±0.5 | 1.8±25% | 4.5±15%
Coil Resistance (Ω) | 375±5% | 3400±10% | 1650±10% | 375±5% | 3800±5% | 41500±12% | 27400±10%
Sensitivity (V/m/s) | 28.8±7.5% | 82±7.5% | 50±7.5% | 28.8±7.5% | 100±5% | 220±20% | 210±15%
Damping | 0.6±10% | 0.58±20% | 0.6±20% | 0.6±10% | 0.595±10% | 0.73±20% | 0.6±10%
Distortion (%) | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.9 | ≤0.9 | ≤0.9
Max. Motion (mm) | 4 | 4 | 4 | 4 | 4 | 4 | 4
Moving Mass (g) | 11.3 | 11.3 | 10.2 | 11.3 | 11.8 | 18 | 11
Spurious Frequency (Hz) | ≥90 | ≥90 | 140 | 140 | ≥90 | - | -
Dimensions (d×h) mm | 25.4×36 | 25.4×36 | 25.4×36 | 25.4×36 | 25.4×36 | 25.4×36 | 25.4×36
Temperature Range (°C) | -40 to +70 | -40 to +70 | -40 to +70 | -40 to +70 | -40 to +70 | -40 to +70 | -40 to +70
Warranty Period (Year) | 1 | 1 | 1 | 1 | 1 | 1 | 1
Weight (g) | 80.4 | 80 | 80 | 80.4 | 81 | 78 | 80

Notes
* Damage resulting from high voltage or physical damage is excluded from the warranty coverage.
* Product specifications may be updated without prior notice.

Characteristics / technical specifications

• Series: 4.5Hz low-frequency geophones (models: 4.5B1, 4.5C1, 4.5D, 4.5F)
• Natural frequency: nominal 4.5 Hz (tolerances vary by model)
• Sensitivity range: ~28.8 V/m/s (standard) up to ~82 V/m/s (high-sensitivity model)
• Coil resistance: from ~375 Ω to ~41,500 Ω depending on model
• Damping: typical ~0.6 (varies by model)
• Maximum motion: 4 mm
• Moving mass: ~10.2–18 g depending on model
• Spurious frequency: typically ≥90 Hz (some models up to 140 Hz)
• Dimensions: 25.4 × 36 mm (diameter × height)
• Operating temperature range: -40 °C to +70 °C
• Warranty: 1 year
• Typical weight: ~78–81 g