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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
 steam boiler simulation
 control of water level and pressure of the boiler and fault circuit
 15 faults that trigger the safety chain
 safety chain according to TRD 602 (german technical rules for steam boilers) containing: level switches, pressure switch and pressure controller
 transparent boiler to observe the water level
 steam pressure simulated using compressed air
 operation of burner simulated
 front panel with process schematic, indicator lamps and lab jacks
 GUNT software for data acquisition via USB under Windows Vista or Windows 7
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
- pressure: 0...6bar
- level: 0...100%
Dimensions and Weight
Weight: approx. 220kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Compressed air: 5bar
Scope of Delivery
1 GUNT software CD + USB cable
1 digital multimeter
1 set of laboratory cables
1 set of instructional material