appLonterm
Long Term Vibration Monitors with Remote Access to Data and Off-Site Alarms

The Profound Vibra series of Vibration Meters are specifically designed for construction and demolition site work in accordance with BS 5228: Part 2 and BS 7385 Part 2. The monitors log peak particle velocity (PPV) and dominant frequency and the measurement period is user-selectable. The Vibra+ sends alarm and data e-mails via an on-board GPRS modem for off-site notification of the exceedance of limits and remote access to data. These instruments have amazing battery life (up to 4 weeks on 3 alkaline D cells) and the data is logged against the real time clock in the instruments' huge memory. Measurements can be taken continuously or only during user-specified periods and/or only above a user-specified vibration level. The instruments can also save the waveforms of the highest, (up to) nine noise events per hour (the waveform data is not available remotely).

  • Logs Peak Particle Velocity (PPV) and Peak Particle Acceleration (PPA) in 3 dimensions continuously or only during user-specified periods and/or only above a user-specified vibration level
  • Logs dominant frequency of the maximum PPV for each measurement period
  • The Vibra+ can send out an alarm e-mail on its GPRS modem when a user-selected trigger level is exceeded
  • The alarm e-mail contains a summary of the data since the last alarm e-mail
  • The Vibra+ can send out a daily data e-mail with all the results (except the waveform traces)
  • Captures time traces of the velocity waveform (stores up to 9 traces per hour)
  • Rugged construction makes Vibra ideal for monitoring on construction sites
  • Flexible and practical geophone mounting options
  • The measurement period is programmable from 1 second to 999 seconds and the system will store up to 37800 sets of full results (this equates to more than 3 weeks for measurement periods of 1 minute or more)
  • Frequency range from below 1 Hz – 100 Hz (digital processing extends the frequency range – unprocessed typical geophone responses tail off sharply below about 4.5 Hz and this can result in an underestimate of potentially damaging low frequency vibration)
  • Measures up to 100mm/s
  • Frequency range and accuracy in accordance with DIN 45669:1995 Class 1
  • External alarm beacon available
  • Full PC analysis software provided as standard with each Vibra
  • Method of determination of dominant frequency is user-selectable (zero-crossing or FFT)
  • Downloaded waveform traces can be frequency analysed using FFT
  • Peak displacement recorded for each channel in addition to velocity and acceleration
  • FFT narrowband analysis used to determine the dominant frequency of the maximum PPV.