Water Purifier TDS Reading Fine Yet the Filter Light Never Stops Flashing? NL-TDS-4 Probe and Cartridge Life Bench, Six Stations (level sensor life test)

Water purifiers whose outlet measures a TDS of ten-something on a handheld meter while the filter light keeps flashing, so the customer assumes the machine is broken; or the reverse, a single-digit display on a cartridge that has clearly broken through, with water that already tastes earthy. Both sit in the sensing chain: scaled electrodes, polarization and failed temperature compensation push the reading off, while cartridge life is only estimated from cumulative throughput and run time, so a household with poor feed water and low daily draw falls off both lines. The line test is one powered flush at the end of assembly; how far the probe drifts after hundreds of hours and when a cartridge really breaks through on a real draw-off rhythm are unknown, and the after-sales answer is a new cartridge or a new machine.

What the NL-TDS-4 probe and cartridge life bench measures

• Six stations in parallel cycling a real draw-off rhythm — morning and evening peaks, long draws, idle standby — with probe readings re-checked against reference solutions at intervals to quantify the offset (the water-quality branch of our level sensor life test)
• Scaling and recovery: runs on water blended to different hardness levels, logging the reading error once scaled and how far it recovers after cleaning
• Temperature compensation: inlet temperature switched across seasonal bands to verify the corrected display value
• Cartridge breakthrough: outlet quality sampled against cumulative throughput to plot the decay curve and show how much margin the rated life really holds
• Indicator versus measured life: the warning point and the breakthrough point plotted on one chart to judge whether the lead time is sensible
• Stable supply pressure and flow: a constant-pressure supply module keeps every station on identical inlet conditions (the constant-pressure application of a pump test bench)
• Barcode and batch binding, with raw data exported per unit for probe and cartridge lot comparison

Applicable standards

GB/T 30307 (drinking water treatment units for household and similar use), QB/T 4143 (ultrafiltration water purifiers for household and similar use), GB 34914 (minimum allowable values of water efficiency and grades for reverse osmosis purifiers), GB 4706.1 (household appliances – general safety) and GB/T 2828 sampling; criteria can follow the customer’s standard and the cartridge construction.

Stations and throughput

Six stations running 24/7 turn a handheld meter and a glance at the filter light into curves, batches and trends, with probe offset and cartridge decay rechecked round by round — so incoming probes and cartridges, and end-of-line machines, can all be sampled batch by batch, stopping wrong readings and early breakthrough before shipment.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of water-quality probe and cartridge life benches, level sensor life test machines for level and water quality, 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.