Three Level-Sensor Types on One Line, Three Different Fault Reports? NL-LSM-6 Mixed-Line Life and Calibration Bench (level sensor life test)

Three sensing principles are in production at once: capacitive sensing through the wall, a mechanical float, and a pressure diaphragm tapping the head. An appliance plant builds all three on one line, and they fail in completely different ways. Capacitive units shift their switching point as water quality and scale change. Floats stick and never move when the water arrives. Pressure types age at the diaphragm, widen the hysteresis band and start short-cycling. Service hears three stories — no fill, overflow, chatter — while the line has one continuity lamp: no switching point, no hysteresis, no response time, no margin left after ten thousand cycles. Mixed-line production does not lack a standard part; it lacks one bench that can host all three principles.

What the NL-LSM-6 mixed-line bench measures

• Six stations on one line, fixture-adaptive for all three principles: wall-contact for capacitive, guided float for mechanical, pressure port for diaphragm types — a changeover swaps fixtures, not programs (the mixed-line version of our level sensor life test range)
• Switching point and hysteresis: water level stepped in 0.5 mm increments, rising and falling points logged separately, hysteresis computed per unit
• Repeatability: thirty round trips per sample, scatter of the switching point judged, so intermittent no-action parts become visible
• Response time: step change to output transition logged per unit, the waiting time in control logic set from data
• Scale and deposit effect: hard water circulated, switching point re-checked on a scale cycle, a cleaning and replacement interval derived
• Life cycling: switching point, hysteresis and response re-measured after tens of thousands of level changes, decay plotted against cycles
• Temperature compensation: calibrated in 5 to 85 °C water in stages, switching point stable across hot and cold duty
• Barcode and type binding, switching point, hysteresis, response and life data exported per unit for cross-principle comparison

Applicable standards

GB/T 14536.1 and GB/T 14536.9 (the IEC 60730-2-8 basis for electrically operated water valves and associated automatic controls), GB/T 4288 (household electric washing machines), IEC 60335-2-7, GB 4706.1 and GB/T 2828 sampling; switching windows, hysteresis and life criteria can follow the customer standard.

Stations and throughput

Six stations running continuously host all three principles in one loading, replacing “touch it and watch the lamp” with per-unit switching points, hysteresis, response times and life curves. Incoming sensors, appliance assembly and returned-part re-tests share one bench, turning three fault descriptions into one comparable report.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of mixed-line level sensor life and calibration benches, level sensor life test machines, washing machine test equipment, dishwasher test equipment, pump test bench and pump performance test systems.

Keywords: pump test bench, pump performance test, level sensor life test, dishwasher test equipment, washing machine test equipment.