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CT 400

- Control and load unit for four-cylinder diesel and petrol engines up to 75kW
- Air-cooled eddy current brake with precise torque adjustment for use as load unit for engine
- Easy connection of engine
- Complete test stand setup in conjunction with an engine


Technical Description

This test stand measures the power output of internal combustion engines delivering up to 75kW. The complete test stand consists of two main elements: The CT 400 as the control and load unit and a choice of engine: CT 400.01 petrol engine or CT 400.02 diesel engine. The engine to be investigated is connected to the CT 400 using a coupling with jointed shaft.

The main function of the CT 400 is to provide the required braking power. The brake unit is an air-cooled eddy current brake. The braking torque can be precisely adjusted using the exciting current. The braking torque is measured by means of a suspended brake unit and force sensor. Due to the air cooling of the brake, the engine test stand does not require cooling water inlet or outlet. A stabilisation tank with an intake air duct for the combustion air is mounted on the frame. The quantity of air taken in is measured in the duct.

The switch cabinet contains digital displays for the speed, torque, volumetric intake air flow rate and temperatures (exhaust gas, engine oil, engine cooling water (inlet and outlet), fuel and intake air). The switch cabinet pivots, enabling the operator to adjust it to the optimum viewing angle.

Data is transferred between the CT 400 load unit and the engine via a data cable connecting the switch cabinets of the two units. 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.

In addition to the standard safety features (e.g. oil pressure, temperature limiter), the load unit contains a limit switch to monitor whether the brake and the engine are correctly connected.

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

Learning Objectives / Experiments

In conjunction with an engine (CT 400.01 / CT 400.02)
- plotting of torque and power curves
- determination of specific fuel consumption
- determination of volumetric efficiency and lambda (fuel-air ratio)
- energy balances
  * overall engine efficiency


[1] load unit for prepared four-stroke diesel or petrol engines with a maximum power output of 75kW
[2] air-cooled eddy current brake for applying load to the CT 400.01 and CT 400.02 engines
[3] force transmission from engine to brake via rotationally elastic coupling and jointed shaft
[4] stabilisation tank for intake air approx. 220L
[5] potentiometer for continuous adjustment of brake
[6] potentiometer to "accelerate" engine
[7] recording of braking power via speed and braking torque
[8] measurement and display of engine load, air temperature, intake air consumption, speed
[9] measured value displays for engine: temperatures (oil, exhaust gas, cooling water, fuel), oil pressure, fuel consumption (using precision scale)
[10] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

Eddy current brake
- max. braking torque: 200Nm
- max. speed: 5000min-1
Measuring ranges (sensors on CT 400 and engine)
- speed: 0...6000min-1
- torque: 0...240Nm 
- volumetric flow 
  intake air: 0...6m³/min cooling water: 0...50L/min
- Temperatures:  -50...200°C
  Exhaust gas: 0...1200°C 

Dimensions and Weight
LxWxH: 1200x950x1920mm
Weight: approx. 446kg Required for Operation 230V, 50/60Hz, 1 phase

Scope of Delivery

1 load unit
1 GUNT software CD + USB cable 
accessories (including tools, battery charger, cables (data, USB), precision scales, exhaust gas hose 2,5m)
1 set of instructional material

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