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ET 500

- Two-stage compressor with intercooler
- Compression process on a p-V diagram
- GUNT software for data acquisition


Technical Description

Compressed air for industry and businesses that use compressed air as an energy source is generated by means of so-called compressed air generation systems. A key component of these systems is the compressor. It converts the supplied mechanical energy into a higher air pressure. Compressed air generation systems are used to drive machines in mining, for pneumatic control systems in assembly plants or tyre inflation systems at petrol stations.

ET 500 includes a complete compressed air generation system with a two-stage compressor and an additional pressure vessel as intercooler. The trainer enables the recording of compressor characteristics and representing the compression process in a p-V diagram.

The air is sucked into the intake vessel and calmed there before it is compressed in two stages. The additional pressure vessel for intercooling is located between the first and second stage. After the second stage, the compressed air is pressed into another pressure vessel through a cooling tube. To achieve a steady state, the compressed air can be released through a blow-off valve with silencer. Safety valves and a pressure switch complete the system.

Sensors measure the pressures and temperatures in both stages as well as the electric power consumption. A nozzle at the intake vessel serves to determine the intake volumetric flow rate. The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- design and function of a two-stage compressor
- measurement of relevant pressures and temperatures
- determination of the intake volumetric air flow rate
- compression process on a p-V diagram
- determination of the efficiency



[1] recording the characteristic of a two-stage compressor
[2] piston compressor with 2 cylinders in V-arrangement
[3] intake vessel with nozzle to measure the intake volumetric flow rate, pressure sensor and additional manometer
[4] pressure vessel after the first stage as intercooler
[5] pressure vessel after the second stage with safety valve, blow-off valve and silencer as well as an additional manometer and a pressure switch
[6] sensors for pressures, temperatures and electric power output
[7] digital displays for temperatures, pressures, differential pressures and electric power output
[8] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

- two-stage
- with 2 cylinders in a V-arrangement
- power consumption: 3kW
- speed: 710min-1
- intake capacity: 250L/min
- quantity delivered: 202L/min (at 12bar)
- operating pressure: 12bar, max. 35bar
Intake vessel: 20L
Pressure vessels, 16bar; capacity:
- after 1st stage: 5L
- after 2nd stage: 20L

Safety valve: 16bar

Measuring ranges

- differential pressure: 0...25mbar

- pressure: 1x 0...1,5bar / 2x 0...16bar

- temperature: 4x 0...200°C

- power: 0...3500W

Dimensions and Weight
LxWxH: 1550x800x1500mm
Weight: approx. 260kg Required for Operation
400V, 50/60Hz, 3 phases or 230V, 60Hz/CSA, 3 phases

Scope of Delivery

1 trainer
1 GUNT software CD + USB cable
1 set of instuctional material

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