Loop-powered, stainless steel analog shaft tachometer

July 28, 2010
Electro-Sensors, Inc. announces the ST420, a loop-powered, stainless steel analog shaft tachometer.
The ST420 requires no user calibration, providing a dependable shaft speed monitoring solution right out of the box. The rugged, compact ST420—only 18mm in diameter—reliably detects magnetic pulses from a rotating shaft-mounted pulser disc or wrap. Then, the ST420 uses quartz crystal-based digital processing to convert 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 ST420 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 ST420 resists harsh plant environments and is rated NEMA 4X/IP67.Also available is the ST420-DI* shaft tachometer, which delivers reliable shaft speed monitoring by incorporating the above features into a rugged M18x1 sensor housing with a built-in ½" NPT conduit port. This dust ignition-proof model is designed for Class II (Groups E, F & G) environments.Applications: Offering both standard and custom measurement ranges, the ST420 facilitates precise shaft speed monitoring in industries including:- Grain processing
- Bulk materials handling
- General manufacturing
- Ethanol/biofuels processing
- Mining
- Power generation plants
- Water utilities 
- Packaging
- Food processing
- Textile production

Electro-Sensors, Inc. - www.electro-sensors.com

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