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ET371 · PID Temperature Control

Experimental Apparatus for the Study of PID Temperature Control

A modular apparatus for the study of temperature control with a PID controller. A PT100 sensor measures the temperature inside a box heated by a lamp, and a converter turns the reading into a 4-20 mA signal. The PID controller answers through its own 4-20 mA output, which drives the thyristor power dimmer that feeds the lamp. Students wire the whole loop themselves with safety leads.
Description
    The ET371 is built from panel modules on a tabletop frame. A power supply module gives 24 V DC from the 230 V AC mains. The PID temperature controller module works in self-tuning or manual mode, shows setpoint, input and output on a 4-digit display, takes a 4-20 mA input, gives a 4-20 mA output and has a binary alarm output. A three-wire PT100 temperature sensor module and a PT100 to 4-20 mA signal converter module make up the measuring chain. The single-phase power dimmer module sets the conduction angle of its thyristor from the 4-20 mA control current and feeds the heating unit module, a box with a 60 W lamp at 230 V AC. A 230 V AC indicator module shows the state of the loop.
Features
  • 4-20 mA temperature control loop that the student wires
  • PID controller with self-tuning and manual mode, 4-digit display
  • three-wire PT100 temperature sensor with PT100 / 4-20 mA signal converter
  • single-phase thyristor power dimmer controlled by a 4-20 mA signal
  • heating unit with 60 W lamp at 230 V AC
  • binary alarm output and 230 V AC indicator module
  • tabletop frame
  • measurements possible in dusty conditions
Specifications
    Power supply 230 V, 50/60 Hz, 3 m cable with 2P+E plug
    Power supply module 230 V AC / 24 V DC, 3 A
    PID controller self-tuning and manual; 4-digit display for setpoint, input and output; 4-20 mA input and output; binary alarm output
    Temperature sensor PT100, three-wire
    Signal converter PT100 to 4-20 mA
    Power dimmer single-phase, thyristor conduction angle set by the 4-20 mA control current
    Heating unit 60 W lamp, 230 V AC
    Indicator module 230 V AC
    Frame tabletop, H 610 × L 500 mm
230V
Learning objectives / experiments
  • wiring of a temperature control loop with a PID controller
  • study, configuration and operation of a PID controller
    • proportional, integral and derivative action
    • self-tuning and manual setting of the controller parameters
  • study of an analogue 4-20 mA signal
  • signal of a PT100 temperature sensor, with resistance as a function of temperature
  • use of a power dimmer as final control element
  • response of the control loop to setpoint changes
  • setting of alarm thresholds
Scope of delivery
  • 1 power supply module 230 V AC / 24 V DC, 3 A
  • 1 PID temperature controller module
  • 1 PT100 three-wire temperature sensor module
  • 1 PT100 / 4-20 mA signal converter module
  • 1 indicator module 230 V AC
  • 1 single-phase power dimmer module
  • 1 heating unit module with 60 W lamp
  • 1 set of safety measuring leads
  • 1 tabletop frame
  • 1 set of instructional material

All components and accessories listed under Scope of delivery are supplied, whether or not they are visible in the illustrations.

Required for operation
  • 230 V, 50/60 Hz, 1 phase, socket with protective earth