Physikalisch-Technische Bundesanstalt

Tasks

Research and development in thermodynamics and calorimetry

• Recommendations for the calibration of scanning calorimeters in the
  heating mode or cooling mode   (141 KBytes)
• Computation of temperature fields by Finite-Elemente-Methods for
  Pulse calorimeter and Adiabatic calorimeter
• Certification of calibration materials for scanning calorimetry (Technique, Source)
• Temperature calibration of thermobalances
• Hemispheric and directed total and spectral emissivity: look Section 7.3
• Publications: Thermal analysis, Pulse calorimetry/Thermal analysis, Emissivity, Calorific value of gas

• Pattern approval of instruments for the determination of the calorific value of gases and auxiliary instruments for the purpose of national verification
  • Verification Act
  • Regulations

• Collaboration in providing standards and technical regulations
  • Working committee "Gas measuring" of the German assembly for verification:
    Verification Ordinance, annex 7, "measuring instruments for gas", PTB requirements, PTB testing instructions
  • DIN NA 062-05-73 "Gas analysis and gas quality" (Standards of the committee)
  • DIN NA 062-08-14 "Thermal Analysis" (Standards of the committee
  • OIML TC8/SC7 "Gas metering" (Recommendation of the SC's)
  • ISO TC193/SC1 "Analysis of natural gas" (Standards of the SC)
  • German sociaty for thermal analysis (GEFTA): Working group "Calibration of scanning calorimeters", "Calibration of thermobalances", "Thermophysics"

Services

Determination of the calorific value

• Solid and liquid substances by means of bomb calorimetry at 25 °C (uncertainty approx. 0,1%)
• Gaseous substances by means of gas calorimetry at 25 °C (uncertainty 0,2% to 0,3%)

Thermophysical properties of solid and liquid substances

• Heat capacities between -50 °C and 1200 °C by means of differential scanning calorimetry (DSC) (uncertainty 2% - 5% up to 600 °C)
• Heats of /transition between -50 °C and 1200 °C by means of differential scanning calorimetry (DSC) (uncertainty 2% to 5%