CDJ Series Digital Seismic Geophones - CDJ-Z/P4

Description
CDJ Series Digital Seismic Sensor (Geophone) are available frequencies from 1Hz to 100Hz vertical and horizontal direction, and geophone-consisted three-component geophones, borehole geophone, tomographic imaging geophone series with stable performance, high fidelity and consistent quality in oil, gas exploration and other fields.

Applications and Features

1~3Hz geophones applied for deep seismic prospecting, natural earthquake surveillance and prediction, pulse and microseismic measurement for bridge and highways, etc.
4~100 Hz widely used to seismic prospecting of petroleum, coal, metallurgy, defense engineering and etc.
High sensitivity, low-distortion, reasonable damping coefficient, good linear response, good parameter conformity, higher resolution and excellent waterproof property.
Small-sized, easy to install, easy to operate, large ambient temperature range, can meet the demand of multi-wave component seismic data acquisition technology
Technical Specifications ((20℃) Table 1
Medium–High Frequency (vertical and horizontal) Geophones

Parameter\type name CDJ-Z/P4 CDJZ/P4.5 CDJ-Z/P10 CDJ-Z/P15 CDJ—Z/P28 CDJ-Z/P30
CDJ—Z/P38
Natural Frequency (Hz) 4±10%
4.5±10% 10±5%
15±5%
28±5%
30±5%
38±5%

Sensitivity G
(v/cm.s-1) 0.28±5% 0.26±5%
Coil Resistance Rc(Ω) 365±5% 365±5% 365±5% 500±5% 500±5% 650±5%
Internal Resistance
（Ω） 345±5% 335±5% 310±5% 415±5% 415±5% 560±5%
Damping Coefficient Bt 0.7±10% 0.58±10% 0.58±10% 0.62±10% 0.6±10% 0.6±10%
Harmonic Distortion D ≤ 0.2
Insulating Resistance
Ri (MΩ) ≥ 20
Coil’S Maximum Displacement P-P(mm) 2
Suspension Mass( g ) 13.2 12.8 8.6 7.9
Working Temperature
（℃） — 40 ～ ＋ 70
Weight ( g ) 255


Table 2

Medium–High Frequency (vertical and horizontal) Geophones

Parameter\type name CDJ-Z/P40

CDJ-Z/P60

CDJ—Z/P80
CDJ—Z/P100

Natural Frequency (Hz) 40±5%
60±5%
80±5%
100±5%

Sensitivity G
(v/cm.s-1) 0.26 ±5% 0.3 ±5% 0.25 ±5% 0.25 ±5%
Coil Resistance Rc(Ω) 690±5% 1030 ±5% 735 ±5% 1080 ±5%
Internal Resistance
（Ω） 580 ±5% 800 ±5% 685 ±5% 1020 ±5%
Damping Coefficient Bt 0.6 ±10% 0.6 ±10% 0.55 ±10% 0.5 ±10%
Harmonic Distortion D ≤ 0.2

Insulating Resistance
Ri (MΩ) ≥ 20 　
Coil’S Maximum Displacement P-P(mm) 2
Suspension Mass( g ) 7.9 5.9 5.5 5.2
Working Temperature
（℃） — 40 ～ ＋ 70
Weight ( g ) 255



Table 3

Low-Frequency (vertical, horizontal and three-component ) Geophones

Parameter\type name CDJ-Z1/P1/S1


CDJ-Z1A/P1A/S1A

Natural Frequency (Hz)

1±10%
Coil Resistance Rc(Ω)
3400±10% 3500±10%
Open Circuit Sensitivity
G (v/cm/s) 2±10% 6.7±10%
Closed Circuit Sensitivity
(v/cm/s) 1.83±10%

6.4±10%


Internal Resistance R（Ω）

3100±10% 3300±10%
Open Circuit Damping Coefficient Bt

0.32±10%
Closed Circuit amping Coefficient

0.43±10%


Insulating Resistance
Ri (MΩ)
≥ 10

Coil’S Maximum Displacement P-P (mm) 6

Suspension Mass （ g ） 770
Working Temperature （℃）
—25 ～ ＋55
Weight (K g ) 8.15 3.4 10 8.15 3.4 10


Table 4

Low-Frequency (vertical, horizontal and three-component ) Geophones

Parameter\type name CDJ—Z2A/P2A/S2A


CDJ-Z2B/P2B/S2B


CDJ-Z2C/P2C/S2S



Natural Frequency (Hz) 2±10%

Sensitivity G
(v/cm.s-1) 1.2±10% 3.5±10%% 2±10%
Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5%
Internal Resistance
（Ω） 1540±5% 12800±5% 5800±5%
Damping Coefficient Bt 0.7±10%
Harmonic Distortion D ≤ 0.2
Insulating Resistance
Ri (MΩ) ≥ 20
Coil’S Maximum Displacement P-P(mm) 3
Suspension Mass( g ) 60
Working Temperature
（℃） —25 ～ ＋55
Geophone Element Weight (K g ) 0.25

Table 5

Low-Frequency (vertical, horizontal and three-component ) Geophones

Parameter\type name CDJ—Z2.5A/P2.5A/S2.5A


CDJ-Z2.5B/P2.5B/S2.5C


CDJ-Z2.5C/P2.5C/S2.5S



Natural Frequency (Hz) 2.5±10%

Sensitivity G
(v/cm.s-1) 1.2±10% 3.5±10% 2±10%
Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5%
Internal Resistance
（Ω） 1540±5% 12800±5% 5650±5%
Damping Coefficient Bt 0.7±10%
Harmonic Distortion D ≤ 0.2
Insulating Resistance
Ri (MΩ) ≥ 20
Coil’S Maximum Displacement P-P(mm) 3
Suspension Mass( g ) 60
Working Temperature
（℃） —25 ～ ＋55
Geophone Element Weight (K g )
0.25

Table 6

Low-Frequency (vertical, horizontal and three-component ) Geophones

Parameter\type name CDJ—Z3A/P3A/S3A


CDJ-Z3B/P3B/S3B


CDJ-Z3C/P3C/S3S



Natural Frequency (Hz) 3±10%

Sensitivity G
(v/cm.s-1) 1.2±10% 3.5±10% 3±10%
Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5%
Internal Resistance
（Ω） 1540±5% 12800±5% 5650±5%
Damping Coefficient Bt 0.7±10%
Harmonic Distortion D ≤ 0.2
Insulating Resistance
Ri (MΩ) ≥ 20
Coil’S Maximum Displacement P-P(mm) 3
Suspension Mass( g ) 60
Working Temperature
（℃） —25 ～ ＋55
Geophone Element Weight (K g )
0.25