{"id":909,"date":"2024-12-25T15:55:16","date_gmt":"2024-12-25T07:55:16","guid":{"rendered":"https:\/\/dabeysensor.com\/?post_type=product&p=909"},"modified":"2026-06-02T09:11:05","modified_gmt":"2026-06-02T01:11:05","slug":"685ah4-piezoelectric-charge-vibration-sensor","status":"publish","type":"product","link":"https:\/\/www.dabeysensor.com\/?product=685ah4-piezoelectric-charge-vibration-sensor","title":{"rendered":"685AH4 piezoelectric charge vibration-sensor"},"content":{"rendered":"

685AH4 High-Temperature Piezoelectric Vibration Sensor (PCB Equivalent)<\/h2>\n

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 \u00b1800 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.<\/p>\n

Key Features for High-Temperature Applications<\/h3>\n

\u2714\ufe0f Extreme Temperature Resistance: Operates in -50\u00b0C to 300\u00b0C environments.
\n\u2714\ufe0f Robust Construction: Laser-welded IP68 housing prevents dust and moisture ingress.
\n\u2714\ufe0f Wide Measurement Range: \u00b1800g with \u22641% linearity for high accuracy.
\n\u2714\ufe0f Industrial-Grade Durability: 3000g shock resistance and 2000g RMS vibration limit.<\/p>\n

 <\/p>\n

Industrial Applications<\/h3>\n

\u2705 Aerospace Testing: Engine vibration monitoring in extreme heat.
\n\u2705 Automotive R&D: Durability testing for exhaust systems.
\n\u2705 Heavy Machinery: Predictive maintenance in high-temperature environments.<\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/strong><\/td>\nSpecification \/ Value<\/strong><\/td>\nNote \/ Condition<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Sensor Type<\/span><\/td>\nPiezoelectric Charge Output<\/span><\/td>\nRequires external charge amplifier or in-line converter<\/span><\/td>\n<\/tr>\n
Core Target Keyword<\/span><\/td>\nVibration sensor<\/span><\/td>\nEngineered for dynamic structural testing<\/span><\/td>\n<\/tr>\n
Sensitivity<\/span><\/td>\n50 pC\/g<\/span><\/td>\nBaseline calibration at room temperature<\/span><\/td>\n<\/tr>\n
Measurement Range<\/span><\/td>\n\u00b1800 g<\/span><\/td>\nPeak dynamic acceleration range<\/span><\/td>\n<\/tr>\n
Frequency Range (\u00b110%)<\/span><\/td>\n1 to 6,000 Hz<\/span><\/td>\nFlat linear frequency response band<\/span><\/td>\n<\/tr>\n
Resonant Frequency<\/span><\/td>\n\u226530 kHz<\/span><\/td>\nMounted natural resonant frequency<\/span><\/td>\n<\/tr>\n
Operating Temperature<\/span><\/td>\n-50\u00b0C to 300\u00b0C<\/span><\/td>\nHigh-temperature capability (charge mode)<\/span><\/td>\n<\/tr>\n
Housing Material<\/span><\/td>\nTitanium \/ Stainless Steel<\/span><\/td>\nCorrosion-resistant, hermetically sealed shell<\/span><\/td>\n<\/tr>\n
Connector Type<\/span><\/td>\n10-32 Top Connector<\/span><\/td>\nCoaxial threaded top-exit connector<\/span><\/td>\n<\/tr>\n
Cross Reference<\/span><\/td>\nPCB Piezotronics Replacement<\/span><\/td>\n1:1 direct functional and physical equivalent<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"
    \n
  • Sensitivity: 50pC\/g<\/li>\n
  • Full Scale Range: \u00b1800g<\/li>\n
  • Frequency Response (\u00b15%): 0.5Hz to 6kHz<\/li>\n
  • Operating Temperature: -55\u00b0C to 288\u00b0C<\/li>\n
  • 10-32 Thread Output<\/li>\n<\/ul>\n

    Application:<\/strong><\/p>\n

      \n
    • Automotive engine testing<\/li>\n
    • high temperature industrial vibration monitoring<\/li>\n
    • high temperature turbine vibration measurement<\/li>\n<\/ul>\n","protected":false},"featured_media":2217,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_angie_page":false,"om_disable_all_campaigns":false,"_uag_custom_page_level_css":""},"product_brand":[],"product_cat":[30],"product_tag":[],"class_list":["post-909","product","type-product","status-publish","has-post-thumbnail","product_cat-acceleration-sensor","first","instock","shipping-taxable","product-type-simple"],"acf":[],"yoast_head":"\n685AH4 Charge Mode Vibration Sensor (PCB Equivalent)| Dabey Sensor<\/title>\n<meta name=\"description\" content=\"685AH4 piezoelectric vibration sensor 50pC\/g,\u00b1800g,300\u2103,replaces PCB. 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