685a03-high-sensitivity-accelerometers

685A03 High Sensitivity Accelerometers (Extreme-Heat Charge Output)

The 685A03 series represents a premium class of high sensitivity accelerometers specifically engineered to capture low-level dynamic vibrations and structural transients within high-temperature, severe-service environments. Utilizing an unamplified piezoelectric charge output architecture encased inside a rugged, hermetically sealed shell, this single-axis transducer maintains structural integrity across a sweeping $-50^\circ\text{C}$ to $+500^\circ\text{C}$ thermal profile without risking crystal depolarization. Optimized for precision engineering applications, the 685A03 pairs an elevated 50 pC/g signal response with an integrated Φ3.2 high-temperature connection piece, delivering elite measurement reliability for gas turbine R&D, aerospace propulsion systems, and nuclear power plant diagnostics.

 

Key Features

• Elevated 50 pC/g Signal-to-Noise Resolution: Designed as high sensitivity accelerometers, these sensors provide powerful charge generation to capture micro-vibrations across low-amplitude testing spectrums, ensuring clean data acquisition prior to external amplification.

• Continuous Sub-Zero to 500°C Thermal Stability: Constructed with premium, ultra-stable piezoelectric crystals and zero internal electronics, preventing thermal drift or performance degradation during prolonged high-heat engine and exhaust operations.

• Integrated Φ3.2 High-Temperature Connection: Features a specialized Φ3.2 high-temperature integral piece connection, engineered to minimize cable mass loading, eliminate triboelectric noise, and guarantee secure electrical transmission under rigorous cyclical heating.

• Titanium / Stainless Steel Structural Armor: Housed within an ultra-tough, hermetically sealed metal casing capable of sustaining continuous linear vibration limits up to 500 g pk and sudden mechanical shocks up to 1000 g pk.

 

Parameter	Specification / Value	Note / Condition
Brand & Model	Dabey Technology Model 685A03	High-temperature dynamic vibration series
Core Target Keyword	High Sensitivity Accelerometers	Classification: Single-axis dynamic transducer
Sensor Type	Piezoelectric Charge Output	Requires external charge amplifier or inline signal conditioner
Sensitivity	50 pC/g	Rated nominal output; excellent signal-to-noise ratio
Measurement Range	±300 g	Full-scale dynamic measurement window
Frequency Range (±5%)	10-2.5k Hz	Reference baseline calibration range
Frequency Range (±10%)	1-4.5k Hz	Extended linearity frequency envelope
Resonant Frequency	≥ 16 kHz	High natural frequency prevents mounting resonance errors
Shock Limit	1000 g pk	Maximum survivable transient shock threshold
Maximum Vibration	500 g pk	Continuous sinusoidal mechanical vibration limit
Operating Temperature	-50°C to 500°C	Unamplified design supports extreme high-heat profiles
Housing Material	Titanium / Stainless Steel	Hermetically sealed, high strength-to-weight ratio alloy
Connector Type	Φ3.2 High-temperature integral piece	Standard micro-coaxial connection for low-noise instrumentation
Primary Applications	Gas Turbine R&D, Aerospace Engine Testing, Industrial Exhaust Monitoring	Optimized for ultra-high temperature dynamic structural analysis