Low frequency accelerometers
Low frequency measurement is critical for many industries. The petrochemical, machine tool and paper industries use low frequency for both condition monitoring and process measurements. Other applications include slow speed agitators, cooling towers, semiconductor lithography and structural testing.
Low frequency measurements and low levels of vibration are closely related, as acceleration levels decrease at low frequencies. In order to have adequate voltage signals at the acquisition equipment, low frequency sensors have greater output sensitivity (usually 500 mV/g) than general-purpose sensors. Additionally, the low-end frequency cut-off is improved (up to 0.1 Hz at -3dB) in order to read slow speed vibration signals.
All Wilcoxon low frequency accelerometers incorporate a low-pass filter with the on-board amplifier electronics to avoid resonance distortion.
Some low frequency accelerometers can be supplied in the ‘hazardous area’ version (Y), for applications in potentially explosive athmosphere.
|Model||Sensitivity||Sensitivity tolerance +/-||Frequency response @ +/- 3db||Max temp.||Accel Range||Haz area option|
|Low frequency accelerometers|
|786LF-500||500 mV/g||5%||0.1 - 13k||120°||10|
|793L||500 mV/g||5%||0.2 - 2.3k||120°||10||Y|
|797L||500 mV/g||5%||0.2 - 3.7k||120°||10||Y|
|799LF||50 mV/g||5%||0.1 - 2.5k||120°||10|
|799M||1000 mV/g||5%||0.2 - 2.5k||80°||5|