Processing Magazine

Stainless Steel Plug-And-Play Compact Shaft Tachometer

July 27, 2010
The loop-powered, stainless steel analog shaft tachometer requires no user calibration. The compact tachometer is only 18mm in diameter. The unit reliably detects magnetic pulses from a rotating shaft-mounted pulser disc or wrap. Quartz crystal-based digital processing converts the pulses to a smooth, continuous 4-20mA analog signal directly proportional to the pulse frequency. The result is a plug-and-play solution that allows users to accurately and simply monitor rotating shaft speed in industrial applications. The shaft tachometer has been tested by UL to the standards UL913 and CAN/CSA C22.2 No 157-92 (Intrinsic Safety), assuring it provides an intrinsically safe solution for Class I (Groups C & D) and Class II (Groups E, F & G) environments, when used with an approved I.S. barrier. Its magnetic pulse detector, signal processing capability and 2-wire loop-powered 4-20 mA circuitry are combined into a robust stainless steel M18x1 sensor housing. With this durable construction, the unit resists harsh plant environments and is rated NEMA 4X/IP67. Applications include grain processing, bulk materials handling, general manufacturing, ethanol/biofuels processing, mining and power generation plants.