TE 60 is a three-station reciprocating tribometer, designed around a high pressure chamber, for experiments under hydrogen and other gases. It includes a vacuum pump for purging the chamber before charging with a chosen gas, so can also be used for tests under medium vacuum. Facilities are provided for running tests with plate specimen temperatures from -55°C to +150°C.
The test assembly, comprising three ball specimen carrier assemblies, is mounted on the underside of the pressure vessel lid. A manually rotated lead-screw assembly is provided for raising and lowering the vessel lid.
Reciprocating motion is generated by a manually adjusted, variable stroke, crank mechanism, driven via a magnetic coupling, by an externally mounted, geared servo motor.
Evacuating, Purging, Charging and Venting
The chamber is supplied fitted with the necessary ports and valves and pressure/vacuum sensors to allow charging of the system. External gas handling and venting systems are not included, but must be installed by the user, in accordance with local standards and safety requirements. It is recommended that all gas connections are hard plumbed in industry standard stainless steel tubing. It is essential that potentially explosive and asphyxiating gases are safely discharged, outside the laboratory, in accordance with local safety regulations.
The normal procedure for charging is to start by evacuating the chamber, to remove as much air as possible. The chamber is then purged, then pressurised, with nitrogen or inert gas. The purge gas is then vented and evacuated. The chamber is then slowly charged with hydrogen (or other test gas) and the specimens soaked for the required number of hours, before the test is started. At the end of the test, hydrogen is slowly vented from the chamber, if necessary, diluted with nitrogen or inert gas.
A cartridge heater and temperature controller are provided for heated tests and a laboratory refrigeration unit with refrigerant probe for cooled tests.
Control and Data Acquisition
Control and data acquisition facilities are provided by a PC in conjunction with a Serial Link Interface Module, High Speed Data Acquisition Card and COMPEND control and data acquisition software.
Number of Test Stations: Three Test Configuration: Ball on Flat Cylinder on Flat Gases: Hydrogen, Argon, CO2 Working Pressure: 0.1 mbar to 100 bar Proof Pressure: 120 bar Stroke Range: 0 to 20 mm Continuously Adjustable Frequency: 0 to 5 Hz Motion: Sinusoidal Loading System: Tension Spring Load Range: 5 to 100 N Friction Range: 0 to 50 N Deflection Sensor: Inductive Transducer Pressure Rating: 150 bar Refrigerant Probe: Action: Contact cooling of plate specimen Temperature Range: Ambient to -50°C Heating Probe: Action: Contact heating of plate specimen Temperature Range: Ambient to 150°C Electrical Feedthroughs: PT100 x 2 Rotary Feedthough: BMD-300 Magnetic Coupling Motor: NX-210 a.c. Servo Motor Automatically Controlled Parameters Frequency Plate specimen temperature Test duration Manually Controlled Parameters Load Stroke Chamber pressure (external service) Measured Parameters Friction Plate specimen temperature Chamber temperature Chamber pressure Number of cycles Derived Parameters Friction coefficient Services Electricity: 220/240V, single phase 50/60 Hz, 7.5 kW Process Gas System: Not included ATex Rating The machine, drive motor and associated instrumentation are ATex rated. The chiller unit, vacuum pump, power module and PC control and data acquisition system are not ATex rated. It follows that these items must be installed outside any ATex rated test cell, with suitable ATex rated connections between the operator work-station and the test cell.
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