• A self-contained mobile two-stage reciprocating air compressor test set to allow investigations into the operation and performance of compressors with a single-stage, two stages and two stages with inter-cooling. 
• Electronic drive units independently control both motors. 
• Meters show motor electrical power consumption of each motor. 
• A close-coupled load cell on each motor measures torque. 
• A sensor on each motor measures speed, shown by a digital indicator. 
• The product of the torque and speed gives true shaft power.
• All controls and instrumentation are on an easy-to-operate mimic panel.
• This test set has two independently-controlled, motordriven compressors, intercooler and air receiver. 
• It works as a single-stage, two-stage or two-stage compressor with intercooler. 
• Electric motors and low-maintenance toothed belts drive two twin-cylinder, air-cooled reciprocating compressors. 
• To allow students to study different types of air-compressor systems, diverter valves allow air to move in different directions. 

These include:

From the first stage to the receiver. Directly to the second stage. To the second stage, by means of the integral water-cooled intercooler. Independent control of the two compressor speeds allows flexibility to match the two compressors under different conditions.