Model: 646B02

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Industrial vibration sensor, 4 to 20 mA output, 0 to 10 g's RMS, 3 to 10k Hz, top exit, 2-pin conn.

  • Measurement Range: 0.0 to 10 g rms (0.0 to 98.1 m/s² rms)
  • Output: 4-20 mA
  • Frequency Range: (±3dB) 180 to 600 kcpm (3 to 10 kHz)
  • Sensing Element: Ceramic
  • Weight: 4.7 oz (131 gm)

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Measurement Range0.0 to 10 g rms0.0 to 98.1 m/s² rms[1] 
Output4-20 mA4-20 mA 
Frequency Range (±3 dB)180 to 600 kcpm3 to 10 kHz[2][3] 
Broadband Resolution0.05 g rms0.49 m/s² rms[4] 
Non-Linearity±1 %±1 % 
Temperature Range-40 to 185 °F-40 to 85 °C 
Enclosure RatingIP68IP68 
Excitation Voltage12 to 30 VDC12 to 30 VDC 
Load Resistance50(Vs-12) Ohm50(Vs-12) Ohm 
Settling Time (within 2% of value)<15 sec<15 sec 
Electrical Isolation (Case)>100000000 Ohm>100000000 Ohm 
Size - Hex1.0 in25.4 mm 
Size - Height2.6 in66 mm 
Weight4.7 oz131 gm 
Mounting Thread1/4-28 UNFNo Metric Equivalent 
Mounting Torque3 to 5 ft-lb4 to 7 Nm 
Sensing ElementCeramicCeramic 
Sensing GeometryShearShear 
Housing MaterialStainless SteelStainless Steel 
SealingWelded HermeticWelded Hermetic 
Electrical Connector2-Pin MIL-C-50152-Pin MIL-C-5015 
Electrical Connection PositionTopTop 
Electrical Connections (Pin A)4-20 mA Pos (+)4-20 mA Pos (+) 
Electrical Connections (Pin B)4-20 mA Neg (-)4-20 mA Neg (-) 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Conversion Factor 1g = 9.81 m/s².
[2] 1Hz = 60 cpm (cycles per minute).
[3] Current will fluctuate at frequencies below 5 Hz.
[4] Typical.
[5] See PCB Declaration of Conformance PS039 or PS053 for details.
081A40Mounting Stud(1)
ICS-4NIST-traceable single-axis amplitude response calibration from 0 cpm (0 Hz) to upper 10% frequency for 4 - 20 mA output vibration sensor(1)
Optional Versions:
(EX) Hazardous Area Approval- contact factory for specific approvals
    Hazardous Area ApprovalEEx nL IIC T4, -40°C≤Ta≤80°C, II 3 G
    Hazardous Area ApprovalDIV I, CL I, II, III, GRPS A-G, Exia, AExia, IIC T4
    Hazardous Area ApprovalDIV II, CL I, GRPS A-D, ExnL, AExnA, IIC T4
    Hazardous Area ApprovalEEx ia IIC T4, -40°C≤Ta≤80°C, II 1 G
(M) Metric Mount
    M081A61Mounting Stud(1)
(RV) Buffered Analog Signal Output - 100 mV/g (±20%)
    Electrical Connector3-Pin MIL-C-5015
    Electrical Connections (Pin A)4-20 mA Pos (+)
    Electrical Connections (Pin B)4-20 mA Neg/Signal Output Neg
    Electrical Connections (Pin C)Signal Output Pos
Product Documents
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