GeoSIG nair - GMS series

GeoSIG's latest seismic recorder offering— nair (rhymes with fire, named after Swiss peak Piz Nair)—is the groundbreaking latest generation of the GeoSIG Measuring Systems with highest performance, excellent operational flexibility and enhanced connectivity. With its optimised installation, operation and maintenance philosophy, nair offers an abundance of features and options. Its user-replaceable modular electronic boards make nair 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 ideal for any application requiring seismic instruments. It boasts an impressive 147db (0.02-20Hz), making it suitable for weak-motion precision recording as well. 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, nair calculates a number of Event Parameters and reports them to a data centre immediately. nair 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 synchronise 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.

nair 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 nair "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 from anywhere around the world.
• Modular plug-in electronics structure provides highly increased serviceability and maintenance as well as easy hardware field upgrades or replacements.

• Data Analysis

• nair 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: nair 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 nair.
  External: All GeoSIG sensors and any other third-party sensors with following specifications can be connected to nair as external sensor(s):
• Sensor output:
• ±20 V, ±10 V, ±2.5 V - differential
•  
• Software selectable
• Power to sensor:
• 15 or 24 VDC / 600 mA

• DigitiSer

• Channels:
• 3 or 6*
• A/D conversion:
• 32 bit Δ−Σ converters individual for each channel
• DSP:
• 32 bit output word length
• Dynamic range:
•  
•    Overall:
• 158 dB per bin @ 1 Hz rel. full scale RMS
  150 dB @ 40 sps peak-peak RMS to RMS shorted input noise
• Wide-band:
•  
•    0 - 500 Hz
• 131 dB RMS full-scale peak to RMS shorted input noise
• ANSS:
•  
•    0.002 - 50 Hz
• 141 dB RMS full-scale peak to RMS shorted input noise
•    0.01 - 15 Hz
• 146 dB RMS full-scale peak to RMS shorted input noise
•    15 - 30 Hz
• 146 dB RMS full-scale peak to RMS shorted input noise
• Sampling rate:
• configurable up to 6 channels @ 5000 sps;
  supports 2 different simultaneous sample rates;
  each channel can have different sampling rates
• Max. bandwidth*:
• 0 to 1000 Hz (other optional)
• Anti Aliasing Filter:
• Analog and digital FIR (finite impulse response)

• Indicators

• LED indicators:
• RGB LEDs for Power, System, Data, Network and Sensor

• 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

• Freely user configurable threshold.

• STA / LTA Triggering

• Freely user configurable STA/LTA trigger and de-trigger ratios.

• Scheduled / Manual

• After start-up, at a given date / time, after event or manual

• 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

• Data Stream

• Protocol / compatibility:
• GSBU, SeedLink, Earthworm*

• 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 freely configurable duration which can be uploaded automatically to data server.

• 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 storage policy to define reserved space per file type.
• Recording format:
• miniSEED and extended miniSEED with information encapsulated into blockette 2000
• Estimated capacity:
• Sampling rate [sps] x 0.4 [MB / day / 3 channel]
  (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):
• < ±0.2 ppm @ -20 to +50 °C
• Accuracy:
•  
•   Running free:
• calculate from above drift
•   Running with NTP:
• < ±0.5 ms
•   Running with GPS or ICC:
• < ±0.001 ms
•   Common time:
• NTP grade timing accuracy among separate units over Ethernet TCP/IP networks

• Power

• Input voltage:
• 9 - 48 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

• Communication and connectivity

• 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
• Connectors:
• Power, Ethernet, Multicom (USB and Serial RS-232), SD card×,
  Sensor(s), GPS×, Alarm×, Option×, Intercon×, Wi-Fi×, micro-USB console×

• Alarm and Notification*

•  
• Alarms:
• 4 independent solid state relay contacts for trigger alarm and/or error (user selectable), with 1 "acknowledge input".
• Alarm levels:
• Freely user configurable based on event triggers
• Relay Hold-On:
• 1 to 60 seconds, typical;
  (Freely user configurable)
• 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:
• 60 V / 250 mA per relay

• Modem / WAN 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, nair 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