ASTM D665 Hydraulic Oil Purification Tester

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The Hydraulic Oil Purification Filtration Tester is designed to maintain and improve oil cleanliness in hydraulic and lubrication systems. You can use this device to remove solid particle contaminants through multi-stage filtration and bypass circulation, ensuring stable system operation and extending the service life of hydraulic components and the entire system. It supports both online purification during operation and offline oil regeneration during filling, oil replacement, or maintenance.

Parameters

Item	Parameter
Rated Flow	1–5 L/min, 10 L/min, 25 L/min
Applicable Medium	Lubricating oil, hydraulic oil
Medium Viscosity	≤ 100 cSt
Operating Temperature	Ambient
Rated Working Pressure	0.6 MPa
Original Pressure Drop	≤ 0.08 MPa
Suction Filter Precision	80 μm / 100 μm
Pre-Filter Precision	10 / 15 / 20 / 40 μm
Fine Filter Precision	3 / 5 / 10 μm
Achievable Oil Cleanliness	NAS 1638 ≥ 4. up to 0

Application

You can apply this tester in various scenarios, including:

(1) Pre-cleaning of hydraulic oil during system filling;

(2) Online circulation filtration for hydraulic and lubrication systems;

(3) Bypass purification during equipment operation;

(4) Regeneration and cleaning of used hydraulic or lubricating oil;

(5) Routine maintenance of industrial hydraulic systems;

(6) Hydraulic systems in construction machinery, metallurgical equipment, injection molding machines, and machine tools;

(7) Oil management in power plants, mining, ports, and heavy-duty equipment.

Standards

You can operate this device in compliance with international and domestic standards:

(1) GB/T 14039 — Hydraulic transmission: Code for solid particle contamination levels in hydraulic fluids;

(2) GB/T 18854 — Hydraulic transmission: Automatic particle counting method for liquid contamination measurement;

(3) ISO 4406 — Hydraulic fluid contamination: Coding of solid particle contamination levels;

(4) ISO 4407 — Hydraulic fluid contamination: Measurement of particle contamination using optical automatic counters;

(5) NAS 1638 — Aerospace hydraulic system contamination levels.

Features

Compact design allows you to move and deploy the unit easily across multiple workstations.

High-performance gear pump and motor provide stable, low-noise, and vibration-free operation with strong self-priming ability.

Multi-stage filtration protects the pump, removes medium particles, and ensures fine particle removal for superior oil cleanliness.

Flexible filtration precision through interchangeable filter elements, meeting different equipment and cleanliness requirements.

Real-time monitoring via pressure gauges enables you to track system performance continuously.

Equipped with differential pressure alarms to alert you when filter replacement is needed.

Safety features include thermal relay, emergency stop, and independent oil-electric separation for reliable operation.

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