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Sentinel GEO MKII is a premium-quality accelerograph with an embedded triaxial velocimeter that was conceived for structural monitoring and seismology with budget-sensitive constraints.
The onboard MEMS triaxial accelerometer which exhibits a dynamic range 85dB and a self-noise 20µg/√Hz can be synchronously sampled up to 250sps.
The embedded triaxial velocimeter sensor is made of three geophones electronically extended to 2 seconds, synchronously sampled at 24bit with a dynamic range that exceeds 120dB.
The contribution, in terms of performance, given by the combination of the two sensors (accelerometer and velocimeter) is considerable. In fact the greater sensitivity of the velocimeter provides better seismic information whereas the resolution of the accelerometer limits the latter and provides better results with strong motion events where the velocimeter would cause saturation.
The integrated memory bank (32 ÷ 256 GB) allows you to manage a ring-buffer for long continuous recordings as well as event data.
The data format is Binary and MiniSEED.
The system implements sophisticated trigger criteria (STA/LTA and threshold) that distinguishes false events (i.e. environment vibrations) from true seismic events.
The internal GNSS receiver allows you to create a network where all the instruments are synchronized with the absolute time.
You can connect to Sentinel Geo MKII locally via network (LAN or WiFi) or, alternatively, remotely using the internal 4G modem (optional).
Sentinel GEO MKII is powered by an external DC source (9 ÷ 36 Vdc) and it is equipped with its own internal battery (LiPo) which can guarantee an autonomy of 5 hours in case of a blackout. The battery can easily be replaced. The internal 4G modem (optional) is backed up by the internal battery.
The instrument comes in an anodized aluminum case which is rugged and shock-resistant and thus suitable for field applications.
