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GeoSIG's latest offering— scai (pronounced /skaI/, like the sky above and named after a Swiss peak, Piz Scai)—is the groundbreaking latest generation of the GeoSIG Measuring Systems with highest performance, excellent operational flexibility and enhanced connectivity. With its optimized installation, operation and maintenance philosophy, scai offers an abundance of features and options. Its user-replaceable modular electronic boards make scai extremely maintainable and future-proof.

It includes an Ethernet connection and optionally a Wi-Fi (b/g/n) module to ensure fast and reliable data transfer. Both wired and wireless network interfaces can be used simultaneously. Its design and efficiency make it the first choice for any application requiring seismic instruments. Highly reduced cost of ownership and user-friendly approach in the design make scai the perfect choice for the most advanced user. Numerous optimisations within the architecture and the design yields unprecedented performance for seamless and fast execution of all system processes.

The instrument’s software processes data in real time. If triggered by a seismic event, scai calculates a number of Event Parameters and reports them to a data centre immediately. scai is a self-contained instrument and is equipped with numerous power options. The instrument uses an “Intelligent Adaptive Real Time Clock” (IARTC) with self-learning temperature compensation, improving the accuracy of the RTC or TXCO significantly. The IARTC is able to synchronize with GNSS (GPS, GLONASS, BeiDou and Galileo) to provide high timing accuracy. Optionally the unit itself can act as an NTP server as well.

The instrument can be locally connected to a laptop through its ports for configuration, testing or data retrieval. The same functions are available remotely as well. Wired or Wireless Interconnected Network option enables the use of several units together in a time and trigger synchronised manner. There are multiple data storage options available.

scai is fully compatible with existing GeoSIG sensors and can co-exist and co-perform in the same network as the GMS series recorders. The simple upgrade path makes scai "future proof."

Applications

Seismic and Earthquake Recorder
Structural Health Monitoring
Real-time Seismology for Free-field and Urban Areas
High Density Earthquake Monitoring Networks
Shake / Hazard Mapping based on Instrumental Data
Earthquake Early Warning and Rapid Response
Damage Estimation, Disaster Management
Seismic Alarm and Safe Shutdown
Ambient Vibration Testing (optionally fully wireless)
Induced Vibration Monitoring and Notification
Building Code Compliant Instrumentation

Use and Versatility
An intuitive web interface is available for easy configuration and interaction as well as display of live data graphs and state of health information, using any web browser.
The device configuration file in XML format can be alternatively edited on site through the instrument console, exchanged by replacing the memory card, remotely from a server or through SSH.
Modular plug-in electronics structure provides highly increased serviceability and maintenance as well as easy hardware field upgrades or replacements.
Data Analysis
scai can perform realtime single/double integration, differentiation, HP/LP/BP filtering, decimation, peak/average calculations on the physical sensor signal and can provide these as realtime virtual signal. All recording and monitoring features can be applied on the virtual signals, simultaneous to the physical signals.
Sensor*
Internal: scai can include select GeoSIG sensors internally. In that case the model name changes accordingly and the sensor levelling is achieved via the three levelling screws of the single bolt mounted base plate of the scai.
External: All GeoSIG sensors and any other third-party sensors with following specifications can be connected to scai as external sensor(s):
Sensor output:
±20 V, ±10 V, ±2.5 V - differential
0 - 20 V, 0 - 10 V, 0 - 2.5 V - single-ended*
4 - 20 mA - current loop*
Power to sensor:
15 or 24 VDC / 600 mA
Digitizer
Channels:
3 or 6*
A/D conversion:
24 bit Δ−Σ converters individual for each channel
DSP:
32 bit output word length
Dynamic range:
Overall:
146 dB (per bin @ 1 Hz rel. full scale RMS)
137 dB @ 50 sps peak-peak RMS to RMS shorted input noise
Wide-band:
0 - 500 Hz
118 dB RMS full-scale peak to RMS shorted input noise
ANSS:
0.002 - 50 Hz
127 dB RMS full-scale peak to RMS shorted input noise
0.01 - 15 Hz
132 dB RMS full-scale peak to RMS shorted input noise
15 - 30 Hz
133 dB RMS full-scale peak to RMS shorted input noise
Sampling rate:
configurable up to 6 channels @ 2000 sps;
supports 2 different simultaneous sample rates;
each channel can have different sampling rates
Max. bandwidth*:
0 to 1000 Hz
Anti Aliasing Filter:
Analog and digital FIR (finite impulse response)
Triggering
Several Trigger Sets can be defined in the instrument. Each set can be flexibly configured regarding the source of trigger, main and advanced trigger parameters,
trigger processing and selected channels for storage. A voting logic based on the monitored channels can be defined.
Trigger Filter
Fully independent high-, low- or bandpass trigger filters can be configured.
Level Triggering
User adjustable threshold.
STA / LTA Triggering
User adjustable STA / LTA values and STA/LTA trigger and detrigger ratio.
Scheduled / Manual
After start-up, at a given date / time, after event or manual triggers.
Early Warning (EEW)*
JMA Earthquake Early Warning
Event Recording
Pre-event memory:
1 to 720 seconds, typical
Post-event duration:
1 to 7200 seconds, typical
Event Summary and Parameters
Content:
PGA, PGV, PGD, SA (at 0.3, 1, 3 Hz)
Transmission delay:
User defined from trigger time
Ring Buffer
Usage:
User can request an event from any period of the ring buffer by specifying the start time/date and the duration from the console or remotely from a server
Method:
Ringbuffer files with configurable duration which can be uploaded automatically to data server.
Data Stream
Protocol/Compatibility:
GSBU, SeedLink, compatible to Earthworm
Storage Memory
Size and Type:
8 GByte Removable SD Card, FAT32 or EXT4 formatted
higher capacity on request*
Management:
Intelligent management of memory card capacity using policies as per file type and ring buffer capacity specification.
Recording format:
miniSEED and extended miniSEED with information encapsulated into blockette 2000
Estimated Capacity:
Sampling rate [sps] x 0.4 [MB / day / 3 channel @ 100 sps]
(example: 40 MByte / day / 3 channel @ 100 sps)
typical, since the data is compressed, capacity depends on the context of the data.
Self Test
Permanent self monitoring of hardware and software components without affecting their normal operation.

User-configurable periodical state of health (SOH) report based on comprehensive test of instrument, which can be requested at any time.
User-configurable periodical sensor test.
Advanced sensor testing with sine, saw and square wave injections.
Logging of temperature and humidity inside the unit.
TimING
Internal clock:
Intelligent Adaptive Real Time Clock (IARTC)
Sources:
Network Time Protocol (NTP),
GNSS (GPS, GLONASS, BeiDou and Galileo) with external antenna
up to 5 m cable, or with external module up to 100 m cable*,
wired interconnection (ICC)*
Free running drift:
Without any source
±0.5 ppm @ constant +25 °C
±2.5 ppm @ -10 to +50 °C
After learn (source disconnect):
< ±0.5 ppm @ -10 to +50 °C
Accuracy:
Running free:
calculate from above drift
Running with NTP:
< ±0.5 ms
Running with GPS or ICC:
< ±0.5 ms
Power Supply
Input voltage:
9 - 48 VDC
optional 9 - 36 or 18 - 75 VDC
90 - 260 VAC / 50 - 60 Hz to 15 VDC
switched UL approved external power block*
Power over Ethernet:
Mode A and B*
Power consumption:
130 mA @ 12 VDC for 3 channels
200 mA @ 12 VDC for 6 channels
Internal battery*:
7.2 Ah for > 24 h autonomy with intelligent charger, higher autonomy is optionally available with external batteries
Indicators
LED Indicators
RGB LEDs for Power, System, Data, Network and Sensor
Communication
Configuration, Data Retrieval°:
Ethernet, Wi-Fi*, Serial line, Console, removable SD card, USB storage*
Network requirements:
Fixed or Dynamic IP on Ethernet LAN and/or internet connection with Ethernet interface
or OpenVPN, upload to HTTPS and SFTP servers, Wi-Fi
(b/g/n) network with WEP, WPA, WPA2 security and Enterprise Mode*
Security:
GeoDAS proprietary protocol over SSL, checksum and software handshaking
Serial ports:
2 ports (console and streaming)
Baud rates:
Console: 115200 baud
Serial stream*: 38400, 57600, 115200 baud
Alarm and Notification*
Alarms:
3 independent or 4 common solid state relay contacts (user selectable) for trigger alarm and/or error, with "acknowledge input" support.
This provides a seismic switch functionality. SMS notification is available.
Alarm levels:
Configurable based on event triggers
Relay Hold-On:
1 to 60 seconds
(User programmable)
Capacity:
The contacts are suitable for a low voltage control. In case a large load must be switched then external relays should be implemented.
Max voltage:
125 V / 250 mA
WIRED Interconnection (ICC)*
GeoSIG proprietary wired common time and common trigger interconnection network via special dedicated cable, distributing GPS-grade time precision among several units.
Modem / WAN / LAN Interfaces*
External peripheral modules for cellular 3G/4G, SHDSL, Fiber optic, etc, are available.
Environment / Reliability
Operational temperature:
-20 to +70 °C**
Storage temperature:
-40 to +85 °C**
Humidity:
0 to 100 % RH (non-condensing)
MTBF:
> 500’000 hours (based on GMS series)
Housing
Type:
Cast aluminium housing
Connectors:
Metallic circular screwed, or MIL-style*
Size:
296 x 175 x 140 mm (W x D x H)
Size with base plate
296 x 225 x 156 mm (W x D x H)
Weight:
4.7 kg (optional < 4 kg)
0.3 kg internal sensor, 2.6 kg internal battery
1.3 kg base plate, ask for other options*
Protection:
IP65 (NEMA 4), IP67 (NEMA 6)*
Mounting:
Base plate with single bolt, surface mount. When base plate levelled and fixed, scai can be replaced without re-levelling.
Easy Transport*:
Portability accessories are available to facilitate short term measurements.
GMSplus series are produced in different types to suit particular specifications or regulations. Specifications mentioned here may be different among different types.

* : Optional
** : Use of an internal battery may degrade this specification
° : Retrieved data can be in the following formats depending on transmission, software and storage method used: miniSEED, DAT, ASCII, SEISAN, SUDS, SAC, SEG-2, Matlab, Artemis

***Specifications subject to change without notice

Modular electronics for field repair and upgrade
3 or 6* channels, up to 2000 sps sampling rate
Low noise individual 24-bit Δ−Σ ADC per channel
Internal built-in and/or external sensor options
Wired, Wi-Fi*, GSM*, satellite* links
Power-Over-Ethernet and wide power range
Smart satellite* or network timing
USB for storage and communication devices*
Continuous data recording to ringbuffers
Flexible configuration of multiple triggers
Simultaneous data streaming to several clients
Virtual signals from realtime processed sensor signal
Rugged aluminium housing with easy installation
Web Interface compatible with smartphones / tablets
Simple and secure remote access over Internet
Alarm output with up to 4 dry-contact relays*
Internal battery*, low power consumption
Hot swappable SD card
Third generation of NetQuakes Recorders

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scai - GMS series

Use and Versatility

Data Analysis

Sensor*

Digitizer

Triggering

Trigger Filter

Level Triggering

STA / LTA Triggering

Scheduled / Manual

Early Warning (EEW)*

Event Recording

Event Summary and Parameters

Ring Buffer

Data Stream

Storage Memory

Self Test

TimING

Power Supply

Indicators

Communication

Alarm and Notification*

WIRED Interconnection (ICC)*

Modem / WAN / LAN Interfaces*

Environment / Reliability

Housing

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