Air Release Value Apparatus DAR-201

Air release value apparatus conforms to the ASTM D3427 standard Test Method for Air Release Properties of Petroleum Oils. It is used to test the ability of turbine, hydraulic, and gear oils to separate entrained air. This apparatus measures the time for the entrained air content to fall to the relatively low value of 0.2% volume under a standardized set of test conditions and hence permits the comparison of the ability of oils to separate entrained air under conditions where a separation time is available. The significance of this test method has not been fully established. However, entrained air can cause sponginess and lack of sensitivity of the control of turbine and hydraulic systems. This test may not be suitable for ranking oils in applications where residence times are short and gas contents are high.

Specification :

Features

1. The apparatus adopts digital display temperature meter, control temperature with high accuracy.

2. Digital timer alarm, easy to operate.

3. The apparatus adopts the pressure regulator valve, pressure gauge displays.

4. Decent and beautiful design.

Technical parameters

1. Rated voltage: AC 220V±10% 50Hz

2. Power: 600W

3. Temperature: Digital display temperature controller

4. Temperature range: Room temperature ~ 100°C

5. Control precision: ±0.1°C

6. Temperature sensor: Pt100 (Platinum resistor)

7. Cycle mode: Pump cycle

8. Ambient requirement: Temperature 15~30°C, Humidity≤85%

Precise Measurement of Air Release in Lubricants with the Air Release Value Apparatus DAR-201

Ensure optimal performance and longevity of industrial lubricants with the Air Release Value Apparatus DAR-201—a fully compliant, benchtop testing system engineered to determine the air release properties of petroleum-based oils and hydraulic fluids in accordance with ASTM D3427, ISO 13737, and DIN 51381 standards. Critical for power generation, steel mills, and heavy machinery, this apparatus measures how quickly entrained air separates from oil—helping prevent foaming, cavitation, and loss of lubricity.

Engineered for Standardized, Repeatable Testing

The DAR-201 Air Release Value Apparatus uses a controlled stream of air bubbled through a heated oil sample (typically at 50°C, 75°C, or 100°C) to saturate it with air. Once air injection stops, the instrument precisely tracks the time required for the oil to release air down to 0.2% by volume—reporting the result in minutes. Its integrated temperature control, calibrated flowmeter, and transparent graduated cylinder ensure high repeatability and operator safety.

Full Compliance with ASTM D3427 & ISO 13737 – Validated design for official quality control and specification testing.
Precision Temperature Control (±0.1°C) – Digital PID-controlled heater with immersion circulator for stable test conditions.
Calibrated Air Flow System – Adjustable flowmeter delivers consistent 100 mL/min air injection as per standard.
Clear Graduated Test Cylinder – Easy visual or automated detection of air/oil interface (optional optical sensor available).
Stainless Steel & Glass Fluid Path – Chemically inert, easy to clean, and resistant to oil degradation byproducts.
Compact, Benchtop Design with Safety Shield – Includes splash guard and stable base for safe, routine lab use.

Trusted in Oil & Lubricant Quality Control

Excessive air retention in lubricants leads to reduced film strength, pump cavitation, oxidation, and erratic system performance. The DAR-201 enables lubricant formulators, oil analysts, and maintenance teams to verify that new or in-service oils meet OEM specifications (e.g., GE, Siemens, Denison, or Vickers requirements).

Whether you’re qualifying turbine oils, hydraulic fluids, or compressor lubricants, the Air Release Value Apparatus DAR-201 delivers the accuracy, compliance, and reliability your quality assurance program demands.

Know your oil’s air release behavior—before it costs you downtime.