In the fields of infrastructure safety monitoring, seismic detection, and large-scale structural health management, ultra-low-frequency, low-noise, and high-stability acceleration sensing is the core to ensuring reliable data and timely warnings. Based on the mature 374A series,Senther has introduced an optimized and updated version of the seismic acceleration sensor, achieving comprehensive upgrades in noise control, low-frequency response, and temperature adaptation. With more stringent performance standards, it meets the precise capture requirements for weak vibration signals in scenarios such as buildings, bridges, tunnels, and geological exploration.
This optimization focuses on three core pain points: lower noise, lower starting frequency, and stricter high-temperature limits. The maximum operating temperature of the optimized product is explicitly reduced to 85°C, ensuring stable output across the full temperature range of -55°C to 85°C, with temperature response error controlled within ±10%, completely resolving drift and distortion issues in high-temperature environments. The noise level is further reduced, with residual noise as low as 0.000005g RMS, enabling stable detection of extremely faint vibrations and preventing minor signals from being drowned out by environmental noise. The lower frequency limit is extended, with the LF version achieving a frequency response of ±3dB down to 0.01Hz, providing distortion-free response in the ultra-low frequency range. This eliminates the monitoring blind zone of traditional sensors below 0.1Hz, enabling precise capture of key signals such as seismic pulses and structural micro-movements.
The optimized version 374A continues the high-performance ceramic crystal sensor with IEPE standard output architecture, delivering superior signal efficiency and signal-to-noise ratio compared to peers. Featuring a built-in low-noise modulation circuit and high-sensitivity design, it achieves a sensitivity of 20V/g at ±0.25g range, enabling strong signal output even for minimal vibrations. Paired with gain amplifiers and signal conditioners, it allows rapid deployment of data acquisition systems, suitable for long-term unattended monitoring. With a sensitivity tolerance of ±10%, nonlinearity ≤1% FSO, and lateral sensitivity below 5%, it ensures precise and consistent measurement results, meeting the high accuracy demands of scientific research and engineering monitoring.
Comprehensive reinforcement in structure and protection. The 316L stainless steel housing is sealed with laser welding, featuring a military-grade 2-pin MIL-C-5015 ejector connector for easy installation and secure connections, suitable for complex field and industrial installation conditions. The housing isolation and dual EMI/RFI shielding design effectively resist electromagnetic interference, static electricity, and overload impacts, ensuring long-term stability in high-electromagnetic, high-humidity, and dust-laden environments, meeting stringent industrial-grade requirements for repeatability and reliability. The product withstands an impact limit of 100g, with rapid power-on response—less than 300 seconds for the LF version and under 30 seconds for the standard version—quickly stabilizing into operational mode after deployment.
Key performance parameters have been comprehensively upgraded, with broader application scenarios. The frequency response covers 0.01Hz to 500Hz, featuring a resonant frequency of 2000Hz, catering to both ultra-low frequency and conventional vibration measurements. Standard constant current power supply ranges from 2–10mA and 18–30Vdc, with an output impedance below 100Ω and an insulation resistance exceeding 100MΩ. The interface is universally compatible with mainstream data acquisition systems. The optimized 374A model offers multiple ranges of ±0.25g, ±0.5g, and ±1g, along with LF low-frequency and standard frequency response versions, enabling flexible adaptation to diverse needs such as building vibration monitoring, seismic detection, bridge health monitoring, dam micro-deformation monitoring, rail transit vibration assessment, and infrastructure vibration research.
Senther Technology is committed to safeguarding infrastructure security with sensor technology, providing users with cost-effective, high-reliability one-stop monitoring solutions. The new version 374A features lower noise, lower frequency response, and more stable temperature characteristics, paired with dedicated cables, signal conditioners, and data acquisition systems. It enables rapid deployment and reduces system integration costs, advancing structural safety monitoring to a more precise, stable, and long-lasting stage, making it a reliable choice in the fields of seismic detection and structural health monitoring.