The GE / Bently Nevada 3500/53 Series Electronic Overspeed Detection Systems for the 3500 Series Machinery Detection System provide a highly reliable, fast response, redundant tachometer system intended specifically for use as part of an overspeed protection system. It is designed to meet the requirements of American Petroleum Institute (API) Standards 670 and 612 pertaining to overspeed protection. The 3500/53 modules can be combined to form a 2-out-of-2 or a 2-out-of-3 (recommended) voting system. The Overspeed Detection System requires the use of a 3500 rack with redundant power supplies.
