These cold air chambers and the included bearing test rigs conform to the requirements of ASTM D1478 Low Temperature Torque of Ball Bearing Greases as well as ASTM D4693 Low Temperature Torque of Grease Lubricated Wheel Bearings test methods.

The top-opening, well insulated cold air chamber is mechanically refrigerated by two hermetically sealed, maintenance-free compressors, arranged in a cascade configuration. Air chamber temperature stability of ±0.1°C is maintained by a digital indicating temperature controller. The digital temperature display shows air chamber temperature to 0.1°C resolution. Additional digital temperature displays are provided for measuring test bearing temperature in the case of ASTM D4693.

For both test methods the torque is measured by a strain gauge and is digitally displayed.

Either model can be configured with one or two independently operated electric drive systems (1 rpm) externally mounted on either side of the air chamber. A thermally insulated drive shaft is used to reduce heat gain by the test bearing. A torque safety limit, stops the electric drive motor if the torque exceeds a preset limit thus protecting the test rig and the drive shaft from damage.

AVAILABLE MODELS: