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ET 860

- Complete steam boiler simulation with pressure and water level regulation
- Safety chain with commercially available components
- Transparent boiler, clear view of the water level
- GUNT software for data acquisition


Technical Description

The pressure and temperature in a steam boiler are increased by constantly supplying energy so that the liquid medium (in most cases water) becomes gaseous. Steam boilers are monitored by safety devices which are electrically connected in series, the so-called "safety chain". If one of the monitoring or control devices trips, an alarm is triggered and the entire system or the affected system component is switched off.

The ET 860 trainer enables a steam boiler simulation to demonstrate the operating principle and response behaviour of a safety chain according to TRD 602. The trainer has a closed water circuit which consists of a supply tank, a pump and a transparent steam boiler model with burner. The boiler is equipped with industrial components which monitor and/or regulate the water level and the pressure. The components used have a high practical relevance. The safety chain for the burner is functional. Burner operation is simulated.

In addition to the safety devices, the system is equipped with 15 fault circuits. This enables the simulation of system component faults so that students can learn how to localise the faults.

Sensors measure the water level and the pressure. The measured values are transmitted directly to a PC via USB. The data acquisition software is included. The process schematic with the safety components, the pressure curves and a representation of the water level can be observed in the software.

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

Learning Objectives / Experiments

- model of an oil-fired steam boiler with operating and safety components
- characteristics of the monitoring elements
- fault circuits
  * burner with flame monitoring
  * pressure switch and limiter
  * feed water and level controller
  * high and low water limiter



[1] steam boiler simulation
[2] control of water level and pressure of the boiler and fault circuit
[3] 15 faults that trigger the safety chain
[4] safety chain according to TRD 602 (german technical rules for steam boilers) containing: level switches, pressure switch and pressure controller
[5] transparent boiler to observe the water level
[6] steam pressure simulated using compressed air
[7] operation of burner simulated
[8] front panel with process schematic, indicator lamps and lab jacks
[9] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

Boiler capacity: 110L
Supply tank capacity: 150L

- power consumption: 40...70W
- max. flow rate: 66L/min
- max. head: 4m
Pressure switch: 0,5...6bar
Pressure limiter: 0,5...6bar
Safety valve: 6bar

Measuring ranges

- pressure: 0...6bar
- level: 0...100%

Dimensions and Weight
LxWxH: 1820x790x1800mm
Weight: approx. 220kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Compressed air: 5bar

Scope of Delivery

1 trainer
1 GUNT software CD + USB cable
1 digital multimeter
1 set of laboratory cables
1 set of instructional material

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