Consumables, spare parts and field accessories for the HORIBA U-50 Series multiparameter water quality meters — U-51, U-52, U-52G, U-53 and U-53G. Select the item you need from the dropdown. Every part is genuine HORIBA and fits the U-50 Series directly, with no adapters or modification.

These are the items that keep a U-50 running season after season: the DO membrane caps and protective covers that wear out with use, the probe guards and rubber caps that absorb impact in rough boreholes, the wiper rubbers that keep turbidity optics clean, the O-rings that maintain the waterproof seal at every sensor port, and the standard solutions needed for routine calibration.

Consumables & seals

• DO membrane caps (3 pcs) — 3200170194
• DO sensor protective covers (3 pcs) — 3200175020
• pH sensor protective covers (3 pcs) — 3200175019
• O-ring set for pH/ORP sensor (10 pcs) — 3200169520
• pH electrode O-ring — 3030053468
• DO electrode O-ring — 3030054233
• Reference electrode O-ring — 3030049447

Probe guards & hardware

• Probe guard, stainless steel — 3200167002
• Probe guard, plastic with holes (no rubber cap) — 3200160840
• Rubber cap for probe guard — 3200054596
• Rubber cap set for sensor guard (8 pcs) — 3200169428
• Wiper rubber (3 pcs) — 3200169789
• DO spanner — 3200098516

Cases, cells & power

• U-5030 carrying case — 5200529244
• Flow-through cell — 3200156570
• Calibration beaker — 3200156572
• KU-20-2 USB communication cable, 2 m, with software — 3200174823
• U-50EP external power supply — 3200358528
• USB connector, leak test (ETO) — 3200225292

Standard solutions

• 140-4 pH 4 standard solution (4 L) — 3200174430
• #306 DO international standard solution (50 ml) — 3200170938
• 330 reference electrode internal solution, 3.33 mol/L KCl gel (250 ml) — 3200043641

Documentation packages

• Traceability certificate — U-50 meter unit
• Traceability certificate — #7112 pH sensor

Each package includes a test report, traceability certificate and NIST traceability chart.

Applications

• Routine preventive maintenance and pre-season instrument servicing
• Replacing consumable DO membranes and caps between sampling events
• Restoring the waterproof seal after a sensor change or O-ring failure
• Low-flow groundwater sampling using the flow-through cell
• Extended deployments and continuous monitoring using external power
• Calibration and QC verification before regulatory sampling
• Supplying documentation for audited or accredited monitoring programs

Documentation

• U-50 Series specifications (PDF)
• U-50 Series instruction manual (PDF)
• U-50PC software instruction manual (PDF)
• U-50FC flow cell instruction manual (PDF)

Related items

Replacement pH, ORP, DO and turbidity sensors and complete probe assemblies are in the Horiba Parts & Accessories collection. Complete meters and control units are in the HORIBA collection.