Tribometers

SRV Tester Overview

Main Features: 

• 10 µm – 2.8 mm stroke / 0.1 mm to 5 mm stroke
• Up to 300/500 Hz oscillating frequency
• High-resolution piezo sensors
• Electromagnetic coils
• Room to 350°C (optional -40°C, 800°C) temperature
• 3000 N downforce

Rtec SRV test system measures friction and wear of lubricant, oil, grease, and additives in linear oscillatory motion. Generate data compliant with several ASTM, DIN, and ISO standards. Test collected samples from the field or for research purposes.

The SRV tester comes fully automated and computer controlled. The setup is easy to calibrate and comes with standard oil and samples. Additionally, it runs several standard test methods and allows for new custom methods. This insures for future petroleum product standards.

 

SRV Test Machines Like No Other

This test method covers studying tribology between two contacting surfaces subjected to high-frequency linear oscillation.

Downforce Control Real-time downforce control		Flexure Design -Unmatched Waveform Control Magnetic flexure design prevents friction of rolling or bearing. In addition, the coil controls the stroke by monitoring smallest of increments of waveform change.
Voice Coil Electromagnetic actuator to impart linear reciprocating motion. Dependent on the test-optional additional coils. These are available to double the friction force range.		Piezo Friction Measurement FFT testers come with  piezo sensors to measure real-time friction at high frequency. Ultra low noise amplifiers allows detection of minute changes in friction.
High Accuracy Position Control The most accurate and precise displacement control in the market. Up to 1nm resolution and micron level of accuracy.		Additional In-line Sensors Acoustic emission for detecting the onset of cracks. ECR measures surface resistance changes to gain more insight on the film thickness.
Environmental Chambers The wide temperature range standard room to 180°C (from -40 to 400/800 °C available). Closed-loop temperature control.		Liquid Containers, Sample Holder Customizable liquid and sample holders for standard and non-standard tests.

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Features Next Generation With stroke control from 10 µm, the Rtec Instruments SRV tester simulates many test conditions that are not possible using any other commercially available tester.

Traceable Friction Force Calibrated friction force sensors to NIST traceable standards. This ensures correct absolute friction values. Platform Rigidity Vibration dampening frame, symmetrical design, and rigid samples holders yield a high system stiffness. This high rigidity facilitates the high repeatability of data and wear marks with ease.

Reliability On Long Runs The unique flexure suspension guides the magnet assembly without contact or lubrication. Furthermore, the design eliminates performance degradation over time. Instead, It delivers near maintenance free operation. Stroke control Ultra precise stroke control allows simulation of many applications. Including studying oil starvation areas and fretting regimes.

Choose Your Model

Choice Depends On Multi Function vs. Single Function

Single Function Tribometer SRV Tester Dedicated SRV tester for reciprocating friction and wear analysis

SRV Test on Multi Function Tribometer MFT-5000 SRV test on the MFT-5000 allows several other friction, tribology, wear tests on the same platform.

Data and Analysis

Custom and ASTM Standard Tests Available

Ball Wear Mark and Volume Wear 3D wear mark of ball surface after the test.

Real Time Friction and Downforce Real-time friction and downforce data

Real Time Stroke Control Real-time downforce and stroke control.

Table 1: COF values at different time intervals

Test	COF_15 min	COF_30 min	COF_90 min
Test 1	0.061	0.0588	0.0589
Test 2	0.060	0.059	0.061

Table 2: Wear Scar Diameter (mm)

Specimen	Test 1	Test 2
Ball Horizontal	0.4780 mm	0.4233 mm
Ball Vertical	0.4978 mm	0.4083 mm
Disk Horizontal	1.348 mm	1.336 mm
Disk Vertical	0.4273 mm	0.4380 mm

 

Several Applicable Standards

ASTM D5706

Standard Test Method for determining extreme pressure properties of lubricating greases using a high-frequency, linear-oscillation test machine 

ASTM D5707

Standard Test Method for measuring friction and wear properties of lubricating grease using a high-frequency, linear-oscillation test machine

ASTM D6425

Equivalent to DIN 51834 part 2, Standard test method for measuring the friction and wear properties of EP lubricating oils using the SRV test machine

ASTM D7217

Standard Test Method for Determining Extreme Pressure Properties of Solid Bonded Films Using a High Frequency Linear Oscillation SRV Test Machine

ASTM D7420

Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation  Test Machine

ASTM D7594

Standard Test Method for Determining Fretting Wear Resistance of Lubricating Greases Under High Hertzian Contact Pressures Using a High-Frequency, Linear-Oscillation Test Machine

DIN 51834-1

Tribological test in the translatory oscillation apparatus Part 1: General working principles

DIN 51834-2

Tribological test in the translatory oscillation apparatus
Part 2: Standard test method for measuring the friction and wear properties of EP lubricating oils

DIN 51834-3

Tribological test in the translatory oscillation apparatus Determination of tribological behavior of materials in co-operation with lubricants

DIN 51834-4

Tribological test in the translatory oscillation apparatus Testing the tribological performance of gear and hydraulic fluids

DIN 62136-1

Textile machinery and accessories – Needle and sinker lubricating oils for weft knitting machines

ASTM D7421

Standard Test Method for Determining Extreme Pressure Properties of Lubricating Oils Using High-Frequency, Linear-Oscillation  Test Machine

DIN 51834-5

Standardization project in the automotive sector

DIN 51834-6

Standard Test Method for Measuring Friction and Wear Properties of Lubricating Grease Using a High-Frequency, Linear-Oscillation Test Machine

DIN 51834-7

Standard Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using a High-Frequency, Linear-Oscillation  Test Machine

DIN 51834-8

Tribological test in translatory oscillation apparatus of bonded solid films DIN 51834-9 Evaluation of plastic greases with plastic specimens