Model 812T is a high-sensitivity accelerometer which simultaneously measures acceleration and low-frequency vibration. 812T is capacitive accelerometer family utilizes a silicon Micro-Electro-Mechanical System (MEMS) variable capacitance sensing element. The output signal is scaled as a voltage which is proportional to the applied acceleration, signal format is single-ended 2.5±2V. The accelerometer is powered by a single regulated supply between 8 to 36 Vdc. Thermal drift has been compensated by internal circuit for the best environment stability. The sensing element and electronics are contained in a tough housing with an integral cable terminated by specified connector for train application. The output cables are protected by fire resistant tubes for long term out-door use. Signal ground is isolated from the test object for better interference shielding. The accelerometer can be mounted by M6 metric screw or adhesive. 812T is well-suited for a wide variety of train and railway applications requiring low frequency measurements and reliable package.