Historical building monitoring: MR3000SB

Vibration monitoring is essential when it comes to historical buildings. Regarding buildings that fall under class I of national importance category, the preservation of their value and current state is a priority.

Monitoring with MR3000SB helps us observe their behavior before an intervention, post-intervention, after an earthquake etc., after which we can come up with a re-enforcement process, keeping in mind the revertibility principle and that of minimally-invasive measures.

Main Benefits

The most advanced monitoring system.
MR3000SB is an integrated and reliable monitoring system for structures and buildings, able to automatically detect, record and process any strong motion vibrations that might affect the structure.
The most easy-to-use system available on the market.
The daisy-chain network (Fiber Optic or Ethernet Copper cable), coupled with latest data retrieval capabilities, make the MR3000SB the easiest to use and most versatile instrument available on the market.
Easy instalation, without any additional help needed.
The all-in-one Red Box with internal battery, AC/DC and terminals already integrated provides all the necessary features for easy installation. Command & control access through an embedded web server provides self-explanatory interface for system set-up and control.
Option of connecting it to any external alarm devices.
The optional kit with 3 configurable relay outputs (alarm 1, alarm 2, device error) can be directly connected to any external alarming devices and used as an earthquake early warning system. A common logic system, for a typical 3-station network, will ensure highest reliability and avoid spurious activation of the warning system.

Main Features

  • IP67 compact unit containing tri-axial MEMS sensor, digital recorder, battery and communications
  • No need of periodic calibration
  • Digital interconnection through Fiber Optics or Ethernet copper type cable with minimal noise
  • Common timing and common triggering
  • Automatic alerting and self-test
  • Remote control and data retrieval

Technical specifications

Data acquisition

  • General principle 4th order delta-sigma ADC per channel
  • Resolution 24 bits
  • Sampling-rate 50, 100, 200, 400, 500, 800, 1000, 2000 sps
  • Number of channels 3
  • Channel to channel skew None, simultaneous sampling on all channels
  • Data Filter Anti-aliasing filters
  • Trigger Filter Digital IIR filter: 0.5 – 15 Hz band-pass (Strong Motion Applications)

Data acquisition

  • General principle 4th order delta-sigma ADC per channel
  • Resolution 24 bits
  • Sampling-rate 50, 100, 200, 400, 500, 800, 1000, 2000 sps
  • Number of channels 3
  • Channel to channel skew None, simultaneous sampling on all channels
  • Data Filter Anti-aliasing filters
  • Trigger Filter Digital IIR filter: 0.5 – 15 Hz band-pass (Strong Motion Applications)

Trigger and de-trigger

  • Principle Level trigger or STA/LTA or automatic adjustment of trigger level
  • Trigger voting logic Predefined AND or OR combinations, individual channel votes
  • Trigger level 1 mg to 4 g
  • STA / LTA STA: 0.1 to 25s, LTA: 1 to 250s, ratio 0.1:25
  • 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 s (in 1 second steps)
  • Post-event recording 1-100 s (in 1 second steps)
  • recording time Unlimited
  • Memory Removable SD flash card (4GB)
  • Timing
  • System clock 1ppm, could be disciplined by NTP or GPS (optional)
  • Data / User Interface
  • Web interface Easy to use command & control through embedded web server
  • Intelligent Alerting System initiates communications and sends e-mail when an event is recorded
  • FTP Built-in FTP client to push data to an FTP-server
  • API Application programming interface REST with extended functions available
  • Alarm triggers
  • Principle Two alarm levels independently settable as threshold levels or user-defined curves, with various notification options (individually settable for each axis)
  • Alarm level range 1 % to 100% full scale
  • User-defined alarm Thresholds and frequencies individually settable for each axis
  • System status 3 LEDs Run, Recording, Warning/Error. Internal LCD with status info and important settings

Network capabilities

  • Common trigger and Configurable with AND/OR logic, for every device within the same network common alarm
  • in LAN network Typically 1 ms with NTP protocol
  • number of MR3000SB 32, in Master/Slave configuration
  • Remote control VPN, DDNS

Power Supply

  • Power supply 100 – 240 V AC, 50 – 60 Hz, internal AC/DC. Optional DC power 10-36 V DC
  • Internal battery 12 V, 12 Ah
  • Consumption 4 W (with charged battery), 25 W (AC max. and battery in charge)
  • Battery autonomy Typical 60 hours in stand-alone mode

I/O (glands and connectors)

  • Power M16 cable gland 4-11mm / Terminals on the AC/DC
  • Kit Relays (3) On request, M16 cable gland 7-11mm / Terminals
  • Kit daisy-chain LAN On request, RJ45 panel mount
  • Kit daisy-chain FO On request, M20 cable gland 6-13mm / ST connectors
  • Kit GPS On request, connector and GPS antenna with 5 m cable for time synchronization

LAN cables

  • Fiber Optic type Multimode OM2 fiber with wavelength 1300 nm, 50/125 μm, Rx/Tx
  • Ethernet Copper type Cat 5e, <100m

Relays kit

  • Configuration 3 output configurable relays, No/Nc
  • Current 2 A, 30 V DC

Acceleration sensor

  • Principle Micro-machined capacity MEMS accelerometer
  • Hysteresis None
  • Noise (10 to 1000 Hz) 7 μg/√ Hz
  • Frequency range DC to 600 Hz
  • Dynamic range 100 dB @ 200 sps
  • Measuring range ±4 g
  • Sensitivity 25 V/g differential
  • Scale factor error < 1 %
  • Orientation Horizontal or vertical mounting, to be specified when ordering
  • Self test Test-pulse, configurable

Housing

  • Dimensions 330 x 230 x 110 mm
  • Weight 5 Kg
  • Protection degree IP67, temporary static immersion in water

Environmental

  • Shock 30 g/11 ms half-sine
  • Heat -20 °C to +50°C
  • Humidity up to 100% RH

Regulations

  • EMC IEC 61326-1
  • Electrical safety IEC 61010
  • Origin Swiss Made

For projects associated with other types of structures:
SHORT-TERM MONITORING

Monitoring
CONSTRUCTION SITE
Assessment of
STRUCTURAL HEALTH
Monitoring
BLASTING
Find out more