Chapter 2. System Overview

Thank-you for purchasing a Güralp Fortimus digital accelerometer.

This section describes the key components of a Fortimus system. The Fortimus unit is the main, standard product in the system; other components and accessories are optional and can be purchased separately. Please check your order confirmation to see which components were purchased with your system.

2.1 Key features

• Digital, three-axis, strong-motion, force-feedback accelerometer.

• Flat response to ground acceleration from DC to 315 Hz.

• Selectable gains for full-scale readings of ±4 g, ±2 g, ±1 g and ±0.5 g.

• 24-bit digitiser with a nominal sensitivity of 2.44 µV per count.

• Selectable sample rates from 1 sample per hour to 5000 sps.

• Data streaming in real-time using GCF (Scream!), GDI-link and SEEDlink.

• Compact form, measuring just 165 × 165 × 84 mm.

• Internal ±2 g MEMS accelerometer for orientation.

• Identification of I.P. address via Güralp Discovery software and, optionally, a cloud-based or organisational registry server.

• Remote instrument and data management via Discovery software.

• Android app for installation integrity checking via Bluetooth.

• Low-latency mode for Earthquake Early Warning (< 40 ms).

• Hot-swappable data storage with dual redundant 64 GB microSD cards.

• GNSS time-synchronisation, compatible with Navstar (GPS), GLONASS, BeiDou and Galileo constellations, with PTP available as an alternative time-source.

• Touch-sensitive, 2.4 inch colour LCD for monitoring and control operations.

2.2 Typical applications

• Earthquake Early Warning systems.

• Multi-scale seismic networks and arrays.

• Structural health monitoring (e.g. dams, industry, buildings).

• Surface and vault installation.

• Posthole deployment.