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 long-term kit includes a weather-resistant case to make continuous monitoring of construction/demolition vibration a practical reality to which the Vibra+ adds 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 Vibra+ has all the features of the Vibra and it can additionally send out alarms and data e-mails using the on-board GPRS modem. The frequency content of waveforms downloaded from the Vibra+ can be analysed using FFT analysis and the detection of dominant frequency can also be on an FFT basis (which is more accurate than the zero-crossing method employed by the Vibra). The Vibra+ also measures displacement which can be important for low frequency vibration.

• 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
• 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

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