YTGEM geotechnical and microseismic
monitoring system
perational monitoring of geohazards
must consider not only early warnings but
also worsening and triggering factors. This leads
monitor numerous different physical
Very Low Power technology
parameters related one to each other through
both transitory and long term physical
interactions for better in-sight and forecast.
Moreover, crisis management situations may call
Smart acquisition protocols
for the monitoring of the most exposed structures
at risk. Such a global monitoring approach calls
High level connectivity
clearly for advanced systems featuring high level
of integration, flexibility and connectivity.
Ready for Cloud Monitoring
The SYTGEM-vlp is a multi-parameter multi-
frequency monitoring unit with very low power
Fields of application
technology for easy deployment in adverse field
conditions. It includes smart data acquisition
Mines and quarries
protocols and networking capabilities for
large scale projects. Each unit may be connected
Geological storage
easily to Bus cabled and/or radio linked
SYTGEO® receivers, RGPS SYTGEO® receivers
Enhanced geothermal systems
and SYTMIS® microseismic and acoustic probes.
Dams and embankments
Landslides and rockfalls
The SYTGEM-vlp monitoring unit features
unique remote administration functions and is
ready for Cloud monitoring technology.
Geotechnical and Microseismic Monitoring System
SYTGEM-vlp overview :
* Motherboard with ARM core phyCORE PXA270
processor, 32 bits, running at 520 MHz, Linux based
OS, SYTGEOscop-vlp embedded application, large
memory with : 32 Mo flash, 64 Mo RAM, 1 Go with SD
card dedicated for data
* 4x20 characters LCD screen interface with
3 press
* Serial bus interface for controlling SYTGEO receivers
and synchronizing SYTGEM-vlp units
* I/O board combining optically coupled inputs and relay
Optional :
* Packs of ion-lithium or rechargeable lead batteries
* Fast microseismic acquisition board up to 150 kHz for 8
channels, DA : 16 bits
* GPS timing device
* 1 to 4 SYTGEO receiver boards mounted inside
* Edge/3G and Wifi b modules
scheme of a
/ early-warning system
based on a pair of SYTGEM-vlp
units, each connected to SYTGEO
receivers through cable bus and
RTS / RGps radio transmitters
Geotechnical and Microseismic Monitoring System
Multi-parameter monitoring capabilities
Hydro-geotechnical - Meteorological measurements
* 1 fast Ethernet connection (10/100 Mbp)
Cable and/or radio connection of 1 to 15 R4, RP, RC and
* 3 USB host connections, data file transfer on USB key
RM SYTGEO receivers to monitor more than one hundred
* 2 asynchronous serial ports (RS232) : 1 SUBD 9pts for
sensors related to: stresses, displacements, strains,
3G modem and 1 for cable link to other SYTGEM-vlp
inclinations, forces, pressures, temperatures, levels, flows,
unit (HE10 board to board connector)
directions, pluviometry, visibility, etc .
* Edge/3G and Wifi b modules (optional)
Total acquisition time varies from a few seconds to tens
of minutes, depending of the topology, the numbers of
Time synchronization
receivers and sensors installed.
* Resolution 1ms, time accuracy ± 2min per month, GPS
GPS-RTK Geodesic measurements
timing device optional
Radio link of a permanent network of
2 to 15 GPS-RTK
* Synchronization accuracy between interconnected
sensors, composed of 2 to 15 SYTGEO RGps receivers,
SYTGEM-vlp < 2ms
one as reference considered at fixed location, others
Input - output board
located for real-time 3D displacement measurements.
Average acquisition time per GPS-RTK sensor ranges
* 8 bistable relay outputs, capacity of 2A with 30Vdc or
15 to 30 min depending on local conditions and
0,5A with 125Vac. Common, Open and Close contacts
expected accuracy.
are isolated to control outer automates and processes
SYTGEO RGps receiver is based on SYTGEO RTS
* 8 optically isolated inputs with common reference,
technology and Magellan bifrequency GPS sensor unit.
polarized at
3V/0,5mA, for software driven automatic
triggering of data acquisition cycle or shift in monitoring
Seismic - microseismic - acoustic measurements
mode from : Normal Vigilance ↔ Alarm ↔ Normal
* 8 differential channels with 16 bits AD conversion
Main auto-diagnosis parameters
* Output voltage to seismic probes : ±12V
* Temperatures, voltages on bus cable, power batteries
and external source, remaining battery charge
* Input voltage amplitude : ±5V
* No responding SYTGEO receiver, sensor flaw
* Commutable bandwidth at -3dB : 0,1Hz to 1kHz or
0,1Hz to 5kHz
* Seismic Autotest calibrated signal
* Signal accuracy : ±0,5% à 400Hz, noise level : < ±1mV
* Data storage memory availability
* Selectable sampling frequency : 1 kHz à 150Khz
* Multi-criteria automatic triggering, automatic adjustable
recording time length
* Automatic activation of calibrated signal from seismic
(depending of configuration and options)
allowing complete test of all seismic channels and
correct functioning of monitoring unit .
Detailed specifications
* 4x20 characters LCD screen interface with
3 press
* Activation of functions, display of operational indicators
and status variables
Geotechnical and Microseismic Monitoring System
This product complies to
73/23/CEE low voltage
directive , electrostatic discharges : EN 61000-4-2 (06/95)
+ A1
(10/98), surge immunity EN
radiated and conducted electromagnetic fields EN 55022
(04/01) class B, radiofrequencies EN 61000-4-3 (02/95) EN
61000-4-6 (02/97), immunity to fast transients EN 61000-4-
4 (06/95).
Operating and storage temperatures for standard
* operating : -20°C à +60°C, storage : -25°C à +75°C
* IP66 enclosure closed, IP13 when opened
Enclosure description
* Polyester enclosure,
2 key locks, Internal caution
* 20 cable glands for cable with from 4 to 18 mm,
connector block for 1,5mm² max.
Remote control
* Dimensions in cm : H = 95, l = 64, p = 30
SYTGEM-vlp monitoring unit is interactively updated,
* Indicative weight : 27Kg (without battery)
parameterized and controlled through :
* local Ethernet / Wifi connection with a laptop equipped
with SYTGEOscop application for Windows
* over-the-air across the internet from central site with
automatic and full manual remote control of most
functions and parameters : auto-diagnosis, reset, data
transfer, data acquisition mode, triggering parameters, I/
O control, software update
Data acquisition and transfer
* CAPA protocol
- dynamic Coupling of Active and
Passive Acquisition
- enhances considerably the
monitoring of transient processes
* User-defined Vigilance and Alert variables improves the
accuracy of monitoring whenever necessary, with
potential triggering events or early signs of instability,
based on GAMA protocol - Automatic Management of
Acquisition Modes - Normal, Vigilance, and Alarm
* Periodic data transfer with self-adjustment of time
intervals following monitoring mode
Electrical specifications
SYTMIS® , SYTGEO® et SYTGEM® are registered trademarks
of INERIS. All specifications subject to change without notice.
In autonomous installation, pack of
18V nominal
batteries. External voltage supply
: from
8V to
following configuration of the monitoring system. Indicative
For more information and custom applications, please contact
power required min./ave./max. during data acquisition
0.75W/1W/2W, during remote control or data transfer mode
< 4W.
Contact :
INERIS - Ecole des Mines - Campus ARTEM -CS 14234
54042 Nancy cedex -France
e-mail : - Internet :