Water Dispenser Runs Dry-Burn Hot While the Tank Is Empty, or Overflows a Full Glass? NL-BAR-4 Level and Dry-Burn Protection Bench (level sensor life test)

Water dispensers and tea bar machines draw two common complaints: heating carries on with the tank dry until it smokes and melts the drip tray, or the machine never stops filling and a full glass floods the counter. The level detection chain is where it fails — a scaled probe no longer reads conductivity truthfully, a float jams on its guide rod, and a reed switch actuation point moves as the magnet weakens. Any one of these turns the dry-burn protection into decoration. The line verifies one fill action before release, so whether the protection still responds after tens of thousands of fill-drain cycles, hard water scale and a tilted installation is unknown until a household smells burning.

What the NL-BAR-4 level and dry-burn protection bench measures

• Six stations, each with its own fill-drain circuit and heater loop, cycling a realistic draw-refill-heat rhythm (the dispenser branch of our level sensor life test range)
• Upper and lower actuation levels plus hysteresis: probe and float action levels logged every cycle and plotted against cycle count
• Dry-burn protection: with the tank drained, cut-off response time and reliability timed on every cycle
• Probe scaling: tens of thousands of cycles on water blended to a set hardness, quantifying scale drift in the conductivity reading
• Float jamming and tilt: repeated action on platforms tilted 0-5°, jams and false actuations counted
• Full-tank stop and overflow: whether the cut-off is timely with a full glass, and whether the overflow guard backs it up
• Heater interlock: level-to-heater logic verified cycle by cycle, leaving no dry-burn window
• Barcode and batch binding, raw data exported per unit for probe, float and reed switch lot comparison

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.19 (liquid heating appliances – particular requirements), GB/T 22090 (cold and hot water dispensers), IEC 60335-2-15 and GB/T 2828 sampling; criteria can follow the customer’s standard and the level sensing construction.

Stations and throughput

Six stations running 24/7 turn a glass poured by hand into actuation level, response time and scale decay data, with the protection loop rechecked round by round — so incoming probes and floats and end-of-line machines can all be sampled batch by batch, keeping burnt tanks and flooded counters out of the field.

Manufacturer

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

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