PCB Piezotronics was founded in 1967 as a manufacturer of piezoelectric quartz sensors, accelerometers, and associated electronics for the measurement of dynamic pressure, force, and vibration. The unique expertise of the company was the incorporation of microelectronic signal conditioning circuitry within these sensors to make them easier to use and more environmentally compatible. These ICP® sensors gained wide popularity and became the foundation for the company's success.

Subsequent growth and steady investment in facilities, machinery, and equipment permitted a constant broadening of the product offering. Measurement capabilities expanded with the addition of piezoceramic, tourmaline, capacitive, piezoresistive, and strain gage sensing technologies. Ensuing products include industrial accelerometers, DC accelerometers, load cells, torque sensors, microphones, pressure transmitters, and calibration equipment.

The backbone of the company is its mission statement: Total Customer Satisfaction. This mission is not only supported by products that offer great value, but also backed by our industry exclusive Lifetime Warranty Plus. Factory applications engineering and a worldwide network of sales offices and representatives are readily available to assist with customer requests.

About PCB Piezotronics

Vibration Sensor - 641B11

Industrial vibration sensor, 4 to 20 mA output, 0 to 1 in/sec RMS, 10 to 1k Hz, top exit, 10-ft integral cable


Model: 641B11

4-20 mA Output Velocity Sensor
Industrial vibration sensor, 4 to 20 mA output, 0 to 1 in/sec RMS, 10 to 1k Hz, top exit, 10-ft integral cable

  • Measurement Range: 0.0 to 1 in/sec rms (0.0 to 25.4 mm/s rms)
  • Output: 4-20 mA
  • Frequency Range: (±10%) 600 to 60000 cpm (10 to 1 kHz
    Measurement Range 0.0 to 1 in/sec rms 0.0 to 25.4 mm/s rms [3][4] 
    Output 4-20 mA 4-20 mA  
    Frequency Range (±10 %) 600 to 60000 cpm 10 to 1 kHz [1][2] 
    Broadband Resolution 0.005 in/sec rms 0.13 mm/s rms [5] 
    Non-Linearity ±1 % ±1 %  
    Temperature Range -40 to 185 °F -40 to 85 °C  
    Excitation Voltage 12 to 30 VDC 12 to 30 VDC  
    Settling Time <15 sec <15 sec  
    Electrical Isolation >100000000 Ohm >100000000 Ohm  
    Size - Hex 1.0 in 25.4 mm  
    Size - Height 4.2 in 107 mm  
    Weight 4.7 oz 131 gm  
    Mounting Thread 1/4-28 UNF No Metric Equivalent  
    Mounting Torque 3 to 5 ft-lb 4 to 7 Nm  
    Sensing Element Ceramic Ceramic  
    Sensing Geometry Shear Shear  
    Housing Material Stainless Steel Stainless Steel  
    Sealing Welded Hermetic Welded Hermetic  
    Electrical Connector Integral Cable Integral Cable  
    Electrical Connection Position Top Top  
    Electrical Connections 4-20 mA Pos (+) 4-20 mA Pos (+)  
    Electrical Connections 4-20 mA Neg (-) 4-20 mA Neg (-)  
    Cable Length 10 ft 3.0 m  
    Cable Type Polyurethane Polyurethane  


All specifications are at room temperature unless otherwise specified.



Product Notes
[1] 1Hz = 60 cpm (cycles per minute).
[2] Current will fluctuate at frequencies below 5 Hz.
[3] Conversion Factor 1 in/sec = 0.0254 m/sec.
[4] Maximum frequency for 1 in/sec rms output, 700 Hz.
[5] Typical.
[6] See PCB Declaration of Conformance PS039 or PS053 for details.
081A40 Mounting Stud (1)
ICS-4 NIST-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 Approval DIV II, CL I, GRPS A-D, ExnL, AExnA, IIC T4
    Hazardous Area Approval Ex d IIC T4 Gb, -20°C≤Ta≤+80°C, II 2 G
    Hazardous Area Approval EEx nL IIC T4, -40°C≤Ta≤80°C, II 3 G
    Hazardous Area Approval DIV I, CL I, II, III, GRPS A-G, Exia, AExia, IIC T4
(M) Metric Mount
     M081A61 Mounting Stud (1)
(RV) Buffered Analog Signal Output - 100 mV/g (±20%)
    Electrical Connector Integral Cable
    Electrical Connections (Red) 4-20 mA Pos (+)
    Electrical Connections (Black) 4-20 mA Neg (-)
    Electrical Connections (White) Signal Output Pos
    Electrical Connections (Green) Signal Output Neg
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