GeoSIG - Model ela - GMS Series -Accelerograph

Its compact and robust purpose-built design allows ela to be used as part of a large deployment for EEW. It can stream real-time data and record with multiple filtering options and embedded adjustable triggering algorithms, making it an asset in damage estimation and disaster management.

ela is a cost-effective solution, yet still effective for many sensitive applications where flexibility in data manipulation is a serious demand.

State-of-health data can be transmitted at user configurable intervals to a data centre for management and maintenance purposes. ela`s many customisable features and its attractive price point — without sacrificing reliability or quality — make it ideal for large scale deployment. ela is fully compatible with existing GeoSIG sensors and can co-exist and co-perform in the same network as the GMS series recorders.

GENERAL

• ela monitors ground motion in three orthogonal axes. It is a compact and robust instrument, designed for large scale deployment for
• indoor and outdoor installation.

Accelerometer

• Type: Triaxial MEMS
• Full Scale: ± 4 g (others available*)
• Dynamic Range: > 80 dB over 0-40 Hz Bandwidth
• Linearity: < 0.5 % typical
• Cross-axis: < 2 % typical
• Measurement error: < 1 % typical

Recording

• Features: Low noise 24 bit ΣΔ, 32 bit output word length
• Sampling rate: up to 2000 SPS
• Anti-aliasing filter: Attenuation > 100 dB, Pass band ripple < 0.5 dB
• Memory: Internal flash memory with up to 100 days re-cording capacity in miniSEED files, where a quota can be flexibly configured.
• Method: Continuous data recording in to ring buffer files, or event recording in event, files. Event and ring buffer files can be uploaded automatically to data server.

Triggering

• Multiple 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, with flexible configuration of multiple triggers.

STA / LTA Triggering

• User adjustable STA/LTA trigger and de-trigger ratio.

Event Summary and Parameters

• PGA, PGV, PGD, as well as Intensity estimation according to GB/T17742 China Intensity Scale

Data Stream

• Real-time waveform data streaming via seedlink, others* available 

TIME BASE

• Internal: NTP, RTC, GNSS* (GPS, BeiDou, GLONASS) receiver 
• External: Antenna for satellite signal
• Clock accuracy: 60 ns with GNSS

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.

Connectivity

• Configuration: Ethernet TCP/IP with remote configuration SFTP remote access to the files
• Supports: Earthquake Intensity Meter protocol (China)

Console Connector

• Accesses serial console for configuration and settings parameters at a Baud rate 115`200 bps.

Alarm / Relay Output Connector*

• Two solid state relay contacts, which can be activated upon triggered event or error with a maximum contact rating
• 60 V / 100 mA and one input acknowledge input galvanically isolated.

Environment / Reliability

• Operational temperature:  -20 to +70 °C
• Storage temperature: -40 to +85 °C
• Humidity: 0 to 100 % RH (non-condensing)
• Ingress protection: IP65
• MTBF: > 500’000 hours

Indicators

• 5 LED indicators on the front panel

Power Supply

• Input voltage: 9 - 48 VDC
• Power over Ethernet (PoE): 48 VDC
• Power consumption: < 2 W

Mounting

• The instrument can be mounted on the floor or wall. The 1 g gravity is automatically compensated.

Housing

• Type: Aluminium housing
• Size: 185 x 145 x 35 mm (W x D x H)
• Weight: 2.4 kg
• GMSplus series are produced in different types to suit particular specifications or regulations. Specifications mentioned here may be different among different types.

*   Optional
** Specifications subject to change without notice