685AH4 piezoelectric charge vibration-sensor

685AH4 High-Temperature Piezoelectric Vibration Sensor (PCB Equivalent)

The 685AH4 is an industry-grade, piezoelectric charge mode vibration sensor purposefully built for high-accuracy dynamic acceleration and component structural monitoring in elevated thermal environments. Featuring a high nominal sensitivity of 50 pC/g, a balanced measurement range of ±800 g, and a linear frequency response spanning 1 to 6,000 Hz, this sensor captures detailed structural dynamics without data degradation. Engineered to serve as a 1:1 direct drop-in replacement and equivalent for legacy PCB Piezotronics models, it provides test engineers with identical mounting compatibility and measurement accuracy alongside exceptionally competitive global production lead times.

Key Features for High-Temperature Applications

✔️ Extreme Temperature Resistance: Operates in -50°C to 300°C environments.
✔️ Robust Construction: Laser-welded IP68 housing prevents dust and moisture ingress.
✔️ Wide Measurement Range: ±800g with ≤1% linearity for high accuracy.
✔️ Industrial-Grade Durability: 3000g shock resistance and 2000g RMS vibration limit.

 

Industrial Applications

✅ Aerospace Testing: Engine vibration monitoring in extreme heat.
✅ Automotive R&D: Durability testing for exhaust systems.
✅ Heavy Machinery: Predictive maintenance in high-temperature environments.

 

Parameter	Specification / Value	Note / Condition
Sensor Type	Piezoelectric Charge Output	Requires external charge amplifier or in-line converter
Core Target Keyword	Vibration sensor	Engineered for dynamic structural testing
Sensitivity	50 pC/g	Baseline calibration at room temperature
Measurement Range	±800 g	Peak dynamic acceleration range
Frequency Range (±10%)	1 to 6,000 Hz	Flat linear frequency response band
Resonant Frequency	≥30 kHz	Mounted natural resonant frequency
Operating Temperature	-50°C to 300°C	High-temperature capability (charge mode)
Housing Material	Titanium / Stainless Steel	Corrosion-resistant, hermetically sealed shell
Connector Type	10-32 Top Connector	Coaxial threaded top-exit connector
Cross Reference	PCB Piezotronics Replacement	1:1 direct functional and physical equivalent