Piezoelectric velocity transducers that measures casing vibration of turbines, compressors, pumps and other rotating machinery, and outputs voltage signals.

Product Overview

Piezoelectric Velocity Transducers

CV series are built-in-amplifier type velocity transducers designed for continuos condition monitoring of rotating machines such as turbines, compressors and pimps. The transducers can be used for machine condition monitoring required by the standards such as ISO 10816, ISO 20816 and API 670.
Since the amplifier including integration circuits is built in, a pure vibration signal can be obtained without influence of external noise even at lower frequency range.

Features

  • Built-in-amplifier type (IEPE Type)
  • Intrinsically safe (TIIS、ATEX、KTL)
  • Type approval certificate for marine use
  • IP67 Dust tight and water proof

System Configuration Diagram

Mounting techniques and frequency response

The accuracy of high frequency response is directly affected by the mounting technique of the velocity transducer. In general, the greater the mounted surface area contact between the sensor and the machine surface, the more accurate high frequency response will be.

Selection Guide of an Optimal Vibration Transducer

Measuring the health of your rotating machinery begins at the transducer. Before choosing a transducer, a thorough understanding of the machine type, application and transducer’s specifications must be taken into account. The following table is an overview of applications for displacement, velocity and acceleration measurements. Please consult a vibration expert to find out what is right for your plant.

Type Eddy-Current Displacement
Transducer
Piezoelectric Velocity
Transducer
Piezoelectric Acceleration
Transducer
Relevant
Machinery
  • Steam turbines
  • Large or medium pumps
  • Compressors
    (plain journal bearings)
  • Gas turbines
  • Generators
  • Motors (plain journal bearings)
  • Fans (plain journal bearings)
  • Gearboxes
    (plain journal bearings)
  • Gas turbines
  • Medium-sized pumps
  • Generators
  • Motors
  • Fans
  • Motors (rolling bearing)
  • Pumps (rolling bearing)
  • Gearboxes (rolling bearing)
Applications
  • Detects relative radial displacement vibrations from low to high speed
  • Detects axial position and rotation speed
  • Detects bearing or casing velocity vibrations for machinery rotating at low to medium speeds
  • Detects absolute displacement vibrations by applying first-order integration.
  • Detects bearing, casing, or gearbox acceleration vibrations for machinery rotating at high speeds
  • Detects absolute velocity vibrations by applying first-order integration.
Main specifications Linear range 2,000 μm Max. velocity vibration 1,270 mm/s pk Measurement range 490 m/s2 pk
Sensitivity 7.87 V/mm 3.94 mV/mm/s 100 mV/9.8 m/s2
Frequency response DC – 10 kHz (-3 dB) 2 Hz – 7 kHz (±3 dB) 1 Hz – 10 kHz (±3 dB)
Sensor operating temperatures -40 to +177 ℃ -50 to +120 ℃ -50 to +120 ℃
Power -24 VDC ±10 %
(Shinkawa model FK-202F)
18 – 30 VDC, 2 – 10 mA
(Shinkawa model CV-861)
20 – 30 VDC, 2 – 10 mA
(Shinkawa model CA-302)
Notes
  • Run-out (noise) will occur in output when measuring points subject to residual magnetic fields or non-uniform materials.
  • Sensitivity varies depending on the electrical properties of the target material.
  • Beat noise from interference may arise if multiple sensors are placed close to each other.
  • Due to unwanted low-frequency phase characteristics, care must be taken when measuring phase analysis.
  • Secured with stud bolt to avoid unwanted high-frequency characteristics due to installation with magnets or adhesive.
  • May be unreliable in low-frequency ranges, particularly if displacement is obtained by second-order integration.
  • Secured with stud bolt to avoid unwanted high-frequency characteristics due to installation with magnets or adhesive.