The velocity transducer is inherently different to the accelerometer with a conditioned velocity output. This device operates on the spring-mass-damper principle, is usually of low natural frequency and actually operates above its natural frequency. The transducing element is either a moving coil with a stationary magnet, or a stationary coil with a moving magnet. A voltage is produced in a conductor when the conductor cuts a magnetic field and the voltage is proportional to the rate at which the magnetic lines are cut. Thus, a voltage is developed across the coil, which is proportional to velocity.

This type of transducer can provide sensitivities of up to 20mV/mm/s and is convenient because it generates a signal without an external power supply and the signal usually does not require further amplification.

The sensitivity vs. frequency response curve of a velocity pickup is limited at low frequencies by the optimum damping of the first natural frequency; at high frequencies its response is limited by the amount of motion necessary to overcome the inertia of the system, as well as by the presence of higher order natural frequencies.

For practical purposes, a typical velocity pick-up is limited to frequencies between approximately 10 and 1500 Hz. This has an advantage in certain applications where high frequency vibration (generated from steam noise for example) can saturate standard accelerometers with a built-in integration function.

It is possible to obtain moving coil type transducers which operate in any axis.The high specification units tend to be only available for operation in either the vertical or horizontal plane due to the arrangement of the sprung mechanism and orientation during factory calibration.

Model Type	Description
Click here	Heavy industrial Self generating 500mV/In/Sec/ or 100mV/In/Sec output Magnetically shielded Frequency range 4.5 Hz to 3 KHz

Specification
Output....................  Frequency range.................... Linearity.................... Max Displacement ....................                     Max Acceleration..................... Temperature  Range .................... Dimensions .................... Weight ..................... Connector Orientation .....................	500mV/in/sec PK +/-3% or 100mmV/in/sec PK +/-3% 4.5Hz to 3 KHz dependant on orientation/sensitivity +/-2% at 100 Hz 100 mils PK to PK 2000g in sensitive axis, 50g in non-sensitive axis -29 to 121oC Please consult Data Sheet 0.4 kg approx. Top or side exit