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Select conveyor monitoring switches by matching each failure mode to a dedicated device: a belt speed slip switch detects underspeed and slip against a reference speed, a longitudinal belt tear switch detects a developing rip before it spreads, and a plugged-chute switch detects material backing up at transfer points. KJT Sensors publishes all three as separate switch families in its conveyor belt switch series, plus a speed control switch family in its speed sensor line. Correct selection requires conveyor speed, material and startup conditions — and startup behavior deserves special attention, because slip switches trip on the acceleration phase unless delays and thresholds are set for the actual profile.
Three failure modes, three device types. Slip (belt losing speed against the drive), longitudinal tearing (rip propagating along the belt) and chute blockage (material backing up at transfers) each need their own switch; no single device covers all three.
Slip detection is a speed-comparison function. A speed/slip switch compares measured belt or pulley speed against an expected reference; the trip threshold and startup delay must be set for the actual conveyor acceleration.
Startup is the classic false-trip window. During acceleration, belt speed is momentarily below nominal — slip logic must be inhibited or delayed through startup (detailed troubleshooting belongs to the startup-trip analysis).
Alarm delays prevent nuisance trips. KJT Sensors documents alarm-delay behavior for plugged-chute switches specifically to ride through transient material surges.
Device parameters are model-level. Sensing distances, output types and trip settings are confirmed for the specific model; the series-level descriptions in this guide frame the selection, not the final configuration.
A belt speed slip switch — sometimes a speed control switch — detects slip by comparing measured conveyor speed against an expected reference and tripping on underspeed.
Slip means the belt is moving slower than the drive pulley, or slower than the process requires. The detection principle is speed comparison: the device monitors belt or pulley speed (often from a pulse-generating sensor or a dedicated slip detector at the pulley) and evaluates it against the reference speed or against an underspeed threshold. When the measured speed falls below the allowed ratio for longer than the configured delay, the switch trips and the conveyor control circuit responds.
KJT Sensors covers this function in two product families. The belt speed slip switch series in the conveyor belt switch line is the dedicated conveyor device, described by KJT Sensors as a slip detection device that judges abnormal belt speed. The speed control switch family in the speed sensor line extends the same capability, and KJT Sensors' speed sensor documentation explicitly lists mining and conveyor systems among its applications — monitoring conveyor drums, gear drives and equipment underspeed or slip. Speed sensor technologies available from KJT Sensors include active and passive eddy-current, Hall-effect and variable-reluctance principles, with gear speed sensors supporting near-zero-speed detection (manufacturer-stated), which matters for detecting a belt that has nearly stopped.
Selection inputs for the slip function: normal operating speed, minimum acceptable speed or slip ratio, startup acceleration time, target material (wet or dusty material can change belt friction and slip behavior), and the control interface the trip signal must reach. For the general device framework around these switches, see the conveyor belt protection system overview.
