Blasting monitoring: MR3000C

Blasting monitoring is necessary in numerous scenarios, such as excavation, mining and building demolitions, in order to analyse the blasting’s impact.

When other structures are nearby those blasted, the vibration levels need monitoring, in order to assess possible damages.

MR3000C is a compact vibration/motion measurement system built in a rugged SYSCOM RED BOX.

The MR3000C is equipped with a new generation of electronic components, keeping the best features of the MR2002, but adding new ones, such as a reduction in size and weight and an increased computing power.

The MR3000C has been designed for different temporary and fixed measurements in the civil engineering and strong-motion surveys.

Applications

Civil Engineering

Industrial Vibrations - Construction Site Monitoring - Tunneling - Truck and Rail Traffic - Blasting Monitoring - Model Verification Earthquake Engineering

Building Monitoring

Monitoring of Structures (Dams, Bridges)

Geology

Soil Characterization

Earth Science

Earthquake Monitoring (seismic Intensity)

Continuous data stream in MiniSeed/SeedLink format

Major Features

IP65 compact unit containing sensor, digital recorder and communications
Internal or external sensor
Triaxial geophone or accelerometer available
External battery pack
External display showing the most important information
Removable memory SD Card
Precise timing (GPS or NTP)
Power over Ethernet (PoE)
Wired & wireless connectivity
Embedded Web Server for the configuration
Event recording principle with multiple level triggers
DDNS, OpenVPN, FTP push network capabilities
Automatic sending of SMS and E-mail in case of event

Technical specifications

Data acquisition

Resolution 24 bit
Sampling-rate 50, 100, 200, 400, 500, 800, 1’000, 2’000 sps, others on request
Number of channels 3
Channel to channel skew None – simultaneous sampling on all channels
Dynamic range 130dB@250, 127dB@500 sps
Data Filter FIR & IIR digital filters
Trigger Filter Digital IIR filter: 0.5 – 15 Hz band-pass (only for accelerometer)
Trigger and de-trigger
Principle Level trigger or STA/LTA
Trigger voting logic Predefined AND or OR combinations, individual channel votes
Level trigger 003 to 100% full scale
STA / LTA (for acceler.) STA: 0,1 to 25s, LTA: 1 to 250s, Ratio: 0,1 to 25.
Smart Trigger / De-Trigger Automatic adjustment of trigger level

Data acquisition

Resolution 24 bit
Sampling-rate 50, 100, 200, 400, 500, 800, 1’000, 2’000 sps, others on request
Number of channels 3
Channel to channel skew None – simultaneous sampling on all channels
Dynamic range 130dB@250, 127dB@500 sps
Data Filter FIR & IIR digital filters
Trigger Filter Digital IIR filter: 0.5 – 15 Hz band-pass (only for accelerometer)
Trigger and de-trigger
Principle Level trigger or STA/LTA
Trigger voting logic Predefined AND or OR combinations, individual channel votes
Level trigger 003 to 100% full scale
STA / LTA (for acceler.) STA: 0,1 to 25s, LTA: 1 to 250s, Ratio: 0,1 to 25.
Smart Trigger / De-Trigger Automatic adjustment of trigger level

Microprocessor

Recording principle Event recording (time history), continuous time recording or manually
triggered
Header Contains status information at time of trigger and event summary
Pre-event recording 1 – 30 seconds (in 1 sec steps)
Post-event recording 1 – 100 seconds (in 1 sec steps)
Data memory Removable SD card
Alarm triggers
Principle Two alarm levels independently settable as: threshold levels, curves defined
by the main regulations or user-defined curves
Alarm level range 1 % to 100% full scale
Alarm based on standards Different built-in standards: DIN 4150-3 (Germany), SN 640312
(Switzerland), Circulaire du 23/07/1986 (France)
User-defined alarm Thresholds and frequencies individually settable for each axis
Notifications Various notification options, individually settable for each axis
Precision timing
System Clock 1 ppm, this clock is disciplined by GPS, NTP
Data/user interface
Intelligent Alerting System initiates communications or sends text message (SMS) or
e-mail when an event is detected
Web Interface Easy to use command & control through embedded web server
FTP Built-in FTP client to push data to an FTP-server
Display
3 LED Run, Recording , Warning/Error
LCD-Display Status information, important settings, event-related information
Wireless Communication
WiFi IEEE 802.11 b/g compliant
Mobile Network (option) Multi-Band UMTS / HSDPA / WCDMA / GSM / GPRS / EDGE

Power Supply

Supply Voltage 9 – 13.5VDC or 48V PoE
Power Consumption 2 W (velocitymeter)
(W/O wireless communication) 3 W (accelerometer)

I/O and Connectors

Type Metallic self-latching push-pull connectors with positioning key (LEMO)
Power Metallic connector with protective GND
GPS Connector for external GPS
LAN / PoE Communication with PC or network – Ethernet 100BaseT

Sensors (Internal)

Triaxial Velocitymeter
Type Velocity sensor with linearized frequency response
A3HV 315/1 (triaxial) (according to DIN 45669)
Principle Geophone
Measuring range full scale ± 100 mm/s
F requency range 1 – 350 Hz
Case-to-coil motion 4 mm p-p
Dynamic range > 130 dB
Linearity/Phase According to DIN 45669 (class 1)
Cross axis sensitivity According to DIN 45669 (<5%)
Orientation Horizontal (floor) mounting or vertical (wall mounting)
Triaxial Accelerometer
Principle The sensing element is an analog force feedback accelerometer featuring a
variable capacitance, silicon bulk-micro machined acceleration sensor
(MEMS) and a custom low-power mixed-signal integrated circuit
(ASIC). The MEMS/ASIC custom design forms a DC coupled analog
servo accelerometer.
Hysteresis None
Dynamic range (100 Hz BW) 100 dB (±4g)
Noise (10 to 1000 Hz) 7 μgrms/√Hz
Frequency response 0 – 600 Hz
Measuring range ±4 g
Orientation Horizontal (floor) mounting or vertical (wall mounting)
Self test Test-pulse