Belt Speed Monitors

Conveyor belt speed sensors monitor belt or rotating-equipment movement and signal an underspeed, slip or zero-speed condition. Early detection helps reduce material build-up and equipment damage caused by a blocked or failed drive. The KBT range includes BSM60/60B and BSM70 models. Selection should reflect the measuring method, normal and minimum speed, mechanical arrangement, output and plant automation interface.

The monitored rotating part must represent true conveyor movement. Set point, delay and output logic should be coordinated with start-up and safe shutdown sequences.

Technical specifications and procurement documents commonly use “conveyor belt speed sensor”, “belt speed monitor”, “zero-speed switch”, “underspeed detector” and “belt speed switch”. Depending on the region and the monitored function, “zero speed switch”, “underspeed switch”, “conveyor speed monitor” and “belt slip switch” may also appear. These expressions overlap, but they do not make two devices interchangeable without checking actuator geometry, contacts, environmental limits and certification.

Relevant KBT product families on this category page include BSM60/60B and BSM70. The model code identifies a product family; the exact actuator, contact arrangement, enclosure and certification must be confirmed from the selected version.

Selection must start with actual site data rather than a model name. Record Normal and minimum operating speed, Mechanical connection or sensing method, Relay/contact or automation output, Delay and threshold adjustment and Temperature, dust, moisture and impact. Compare the shortlist with the current data sheet, dimensional drawing, certificate and control architecture; do not infer an unknown rating from a similar enclosure.

• Normal and minimum operating speed
• Mechanical connection or sensing method
• Relay/contact or automation output
• Delay and threshold adjustment
• Temperature, dust, moisture and impact

Exact limits, contact ratings and certification markings must be verified in the current product data sheet before ordering or commissioning. This verification applies specifically to the selected conveyor belt speed sensor configuration.

Choose a measuring point that still detects a stopped belt if the motor continues rotating; monitoring only the motor shaft is not sufficient in every application. Align the coupling, roller or sensing target and protect it from vibration. Commission under real conditions by checking normal speed, underspeed threshold, start-up delay and zero-speed output.

Used on conveyors, bucket elevators, rotating drums and material-handling machinery for motion confirmation and low- or zero-speed detection.

The conveyor belt speed sensor is a field device within a wider machine-control or safety function. Contact arrangement, PLC input, relay logic, alarm stage, stop stage and restart permission must be defined from the risk assessment. A contact change at the device is not sufficient proof: commissioning must confirm that the intended alarm or safe stop occurs at the machine.

Send the normal/minimum speed, monitored shaft or drum and output requirement; we will help identify the suitable BSM model.

Inspect the coupling, arm, roller or sensing target for wear, looseness and alignment according to the model. Revalidate the speed threshold after process changes so an incorrect setting does not mask belt slip. Periodically create a controlled speed reduction or safe simulation and verify both PLC alarm and shutdown logic.