THETA Standard
Product Overview
At the heart of each THETA seismometer are three newly designed seismic sensors with a truly rectilinear suspension of their inertial masses. Unlike pendulous or parallel spring suspension systems our rectilinear system has virtually no observable spurious modes of resonances at higher frequencies. This allows all THETA seismometers to have a flat response to ground motion velocity between 120 sec and 150 Hz with a high cross axis rejection.
The unique design of the connector turret provides not only easy access to the connectors and cabling. It also make the instrument water proof, when a potted connector is mated.
THETA seismometers are available in a range of form factors, including our THETA Compact instrument.
Key details of both instrument form factors are listed below. Please contact GaiaCode directly for additional information and datasheets for our THETA variants.
THETA Standard Version
Key Features
Instrument Design
- Classical orthogonal sensor topology with sensor axes pointing in the three cardinal directions.
- Fine pitched adjustable feet manufactured from brass.
- All sensor components are made of non-magnetic materials, minimizing noise induced by outside magnetic fields
Instrument Characteristics
- Flat frequency response from 0.008333 Hz (120 seconds) to 150 Hz.
- Optional responses: 60 sec to 150 Hz, 30 sec to 150 Hz, 20 sec to 150 Hz, 10 sec to 200 Hz, 2 sec to 200 Hz, 1 sec to 200 Hz
- Lowest spurious resonance: 340 Hz on both vertical and horizontal sensors.
- Operational range within ± 10.0 degrees of tilt.
- Default sensitivity unless specified otherwise: 2*1000 V/m/s. Offered in a whole range of sensitivities from 2*750 to 2*5000 V/m/s (differential output).
- Cross axis rejection >-68 dB.
- Operating temperature range: -20 to 75 °C.
Enclosure
- Rugged housing made from hard anodized aluminium. A stainless steel version is also available.
- Weight (Standard): 3.10 kg (Anodised Aluminium), 4.80 kg (Stainless Steel).
- Weight (Compact): 1.50 kg (Anodised Aluminium), 2.30 kg (Stainless Steel).
- Dimensions (Standard): Outer Diameter 13.8 cm, height 18.5 cm
- Dimension (Compact): Outer Diameter 10.1 cm, height 15.2 cm
- Waterproof as per IP68 standard.
Power and Electronics
- Power consumption 350 mW at 12 V (sleep mode)
- Power operating range from 9 to 36 Volt.
- The sensor's electronic circuitry is galvanically isolated, protected against polarity switch and voltage transients.
To obtain a detailed data sheet for this seismometer, please contact GaiaCode Headquarters
Disclaimer: The product specifications and the stated data are subject to change without prior notice.
