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  2. Production Systems and Testing Equipment for Bimetal-Snap-Action-Discs

Laboratory Measurement Device
Clickplot 4 [CP4]

Device for recording the distance-temperature curves of bimetal elements

• Acquisition of the distance-temperature curves of snap-action-discs
• Measurement of the snap behavior without an applied load
• Measurement of the snap behavior with an applied load (simulated application condition)
• Monitoring the switching status of up to 2 contacts
• Temperature control using an oil bath (thermostat) or dry
• Adjustable temperature profiles (temperature curve over the time)
• Automatic calculation of the characteristic values
• Real-time recording and rapid data export (csv, xls, ..)
• Temperature measuring range: -40°C to +200°C or +50°C to +300°C
• Distance measuring range: up to 4mm


Standard version
  • Laboratory measuring device for recording the distance-temperature characteristic of bimetal snap disks or similar parts made of thermobimetal.
  • Measurement in dry: measuring range +50°C to +300°C
  • Measurement in an oil bath (thermostat): measuring range -40°C to +200°C
  • Temperature measurement: resolution 0.05°C, accuracy +/-0.2°C, rate of change: 0.1 to 9.9°C / minute
  • Distance measurement: 0 to 4mm, resolution 1µm, measuring accuracy <10µm
  • Measurement with or without an applied load (to simulate the installation conditions)
  • Recording of the snap behavior (distance, temperature, electrical switch contact)
  • Automatic storage and quick export of the measurement results (csv, xls, ..)
Options & Accessories
  • HT version: measuring range in dry +50°C to +300°C
  • Adapter for the test object as required and customer requirements
  • Adapter for mounting the thermostat as required and according to customer requirements
  • Load springs: 10g to 500g
  • Spring scale to control the load
CapacityThe duration of the measurement depends on the set parameters:
  • Temperature start, temperature high, temperature low, temperature high
  • Temperature change rate
  • etc., ..
Process Input
  • Bimetal element (isolated; snap-action-disc or similar)
Process flow and details
  • Placement of the bimetal element in the adapter
  • Setting the base load, the continuous load, the variable load (load springs: 0.1 to 0.2N each)
  • Enter the measurement parameters. Start of measurement.
  • The bimetal element is heated and cooled with the set temperature profile.
  • The snap-action of the tested object is monitored and recorded (path, temperature, electrical switching contact)
  • Graphic display of the recorded path-temperature characteristic
  • Automatic calculation and evaluation of the most important parameters (TOS, TUS, sTOS, sTUS, etc.)
Process output
  • Bimetal element (isolated; snap-action-disc or similar)
  • Mains voltage: 1x230V+N+PE, 50/60Hz AC
  • Electrical power: approx. 0.8 kW (kVA)
  • Other mains voltages and frequencies on request
Environmental conditions
  • Industry standard. Indoor.
  • Temperature: +18°C to +30°C
  • Relative humidity: < 70% non-condensing
Dimensions and weight
  • Table device (approx.): Width 1,000mm x Height 1,200mm x Depth 600mm
  • Space requirement (approx.): Width 1,500mm x Height 1,200mm x Depth 1.000mm
  • Weight: about 70kg