The V901-GSM Seismograph is available as a single channel machine, a twin channel PPV machine and as a twin channel PPV & VDV machine.
Each channel (or geophone pack) has three orthogonally mounted geophones for measuring in the 3 axes (or dimensions).
The V901-GSM Seismograph is powered by 2 ‘D’ cell batteries which last for approximately 20-40 days depending on how many hours per day the Seismograph is monitoring. The Seismograph can also be powered by an external 12 volt battery or an external mains supply (240 v ac). The built in GSM Modem is powered from a separate internal rechargeable battery, which can power the Modem for approximately 10-11 days before requiring recharging.
The V901-GSM Seismograph has a flash memory, which means that no results in its memory are lost if the power is removed from the unit.
The built in GSM Modem allows the user to dial into the V901-GSM Seismograph and have full remote access. The user can watch the Seismograph operating in real time, change the set up of the Seismograph, and download the vibration results from the memory of the Seismograph, in DAT and CSV form.
The V901-GSM Seismograph can alert two mobile phones when a preset vibration trigger level is reached or exceeded. You can send a low alarm text message to one mobile phone and a high alarm text message to another mobile phone, or you can send both text messages to the same mobile phone.
There are two modes of monitoring. They are blasting (or trigger) mode and Piling (or continuous) mode. Blasting mode stores data to 1/100th of a second. Piling mode stores data at 30 second intervals. These settings cannot be altered by the user.
The memory capacity of the V901-GSM Seismograph is 80 days of continuous monitoring or 300 trigger events. When the memory is full then the oldest data is overwritten.
In blasting mode you can measure in velocity, acceleration or displacement. Which ever mode you select, the other two parameters are also measured and stored in the memory along with the frequency. This is for all 3 axes.
- The sampling rate is 1/1000th of a second (and stores 1/100th of a second)
- The velocity range is 0.1 mm/s to 206 mm/s.
- The acceleration range is 0.01g to 20g.
- The displacement range is 0.009 mm to 1.6 mm.
The frequency range is 4.5Hz to 200Hz flat frequency response, with levels down to 2 Hz (for VDV) with roll-off. If the frequency is outside of this range, then nothing is displayed in the frequency data table.
The V901 Seismograph conforms to BS6472 Part 1:2008 when measuring VDV (Vibration Dose Value).
The optional air overpressure microphone has a range of 100db to 140db linear.
When the results are downloaded to a PC, they are saved as DAT files and can be printed at any time. The graphs can be converted to the JPEG format and then inserted into any document. The data can also be saved as .CSV format for Excel files where you can manipulate the data and create your own graphs.