Dytran Instruments model 3525A3 IEPE quartz accelerometer

Dytran Instruments has introduced the model 3525A3 single-axis IEPE hermetically sealed quartz accelerometer with a built-in impedance converting amplifier, capable of operating continuously at high temperatures up to 200°C.

Internal electronics allow the measuring of shock and vibration in high-temperature applications without the need for external charge amplifiers, reducing the cost and complexity of high-temp testing. The sensor has been tested at 200°C for 1500+ continuous hours in a thermal HALT/HASS chamber.

It utilises an inverted quartz sensing element to minimise the unwanted effects of base strain on the accelerometer signal. The use of quartz provides long-term thermal stability and a low thermal coefficient of sensitivity, meaning there is little change in sensitivity when the sensor goes from room temperature to 200°C.

The small, low-mass, hermetically sealed, stainless steel housing makes it suitable for use in locations inaccessible to larger high-temperature accelerometers. Typical uses include applications such as down-hole oil industry, environmental test chambers, HALT/HASS chambers for control, automotive applications including engine and exhaust hot zones, as well as for any general-purpose high-temperature IEPE applications.

It is available with a sensitivity of 10 mV/g and a 5 to 10,000 Hz frequency range (±5%). The model features a top-mounted 10–32 micro coaxial connector and is installed using an integral 10–32 mounting stud.