Shaft speed switches by Electro-Sensors are ideal for super-slow applications

The Electro-Sensors DR1000 shaft speed switch

Electro-Sensors test and measurement solutions are available to Canadian businesses through Durham Instruments – such as the DR1000 series of shaft speed switches. This line comprises complete precision rotation-monitoring systems that are recommended for detecting undesired slowdowns or stoppages of process equipment like pumps, drive trains, power-driven components, screw conveyors, or exhaust fans.

Every model in the DR1000 series is ideal for super-slow-speed applications, with precise setpoint capability over various speeds starting at ½ a revolution per minute (rpm).

Easy field calibration and setup

These switches also work for crushers, tail pulleys, and elevators, and it monitors shaft speeds, detecting shaft slowdown to within one per cent of the setpoint. A DPDT control relay – rated at 5A at 30 Vdc/l20Vac resistive, functions as the output. Durham Instruments recommends the DR1000 series for use in the general manufacturing, aerospace, automation, food-processing, forestry, medical, military, mining, packaging, power-generation, alternative-energy, and transportation sectors and in research and development.

These shaft speed switches are updated substitutes for the R-series of speed switches. Among their key features are digital circuitry, easy field calibration and setup, ETL approval as per relevant UL and CSA Group standards, NEMA 4X.7- and 9-rated cast aluminum switch housing, and setpoint range from ½ to 5,000 rpm. Optional features include explosion-proof sensors and alternative voltages.

Customers can use the DPDT relay for equipment shutdown or as an alarm for rotational failure. The DR1000 series brings efficiency and safety to operations by preventing equipment damage, product waste, and downtime. Every model functions as a system with a remote/external-pulse frequency output sensor and a pulse generator, sold separately. The switch is fail-safe, and any malfunction de-energizes the control circuit.

The most common DR1000 unit includes a 906 or 907 hall-effect sensor and a 255 pulser disc that is shaft-end-mounted and generates an alternating magnetic field picked up by the large-gap sensor. This sensor transmits the speed signal as a digital pulse (i.e., frequency) to the switch through a three-conductor shielded cable. The switch decodes this frequency signal to determine shaft speed and compare this to the pre-adjusted setpoint.

For more information, contact Durham Instruments.

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