Ohler Winfried
Your Technical Services Agency

Thermography

Thermography - What is it?

Thermography is an imaging measuring method for a contactless and non-destructive determination of surface temperatures during normal operation. The measuring equipment records thermal radiation invisible to the human eye and converts this to a visible thermal image (thermogramme).

Thermography - Where is it used and what are its benefits?

Electronic thermography:
  • Reduced risks of fire and accidents in electrical equipment
  • Early detection of defects and weak spots in power supply equipment, overhead line systems and all voltage levels
  • Early detection of developing defects or weak spots on electrical equipment, machinery, drives and equipment, cable storage, conductor rail systems, etc.
Construction thermography:
  • Detection of thermal bridges on and in residential buildings, facilities, workshops or production halls
  • Detection of defects and weak spots caused by water inrush or water confinement
  • Detection of deficiencies, defective installation or damages after or due to redevelopment, modification or new constructions
Industrial thermography:
  • Inspection of characteristics confirmed by the manufacturer for production machinery and facilities as well as production lines
  • detection of defects and weak spots in production facilities
  • Measurements of heat flux as well as temperature profiles and distribution in production facilities and products during operation or the manufacturing process

Thermography - When and how often?

Electronic thermography:
  • After new installation of electrical equipment:
    For the installation company: for documenting an accurate first start up.
    For the operator: for documenting assembly errors or inaccurate first start up to help enforce warranty claims
  • In existing electrical equipment to detect any present faults and weak spots as a preventive maintenance measure to avoid unscheduled system failures
  • Test cycle:
    If possible, after the initial testing, at intervals of one to two years as a replication. This is a reasonable timeframe in which to detect negative changes or looming errors caused by wear and tear, load or environmental influences early enough and start out these before an equipment failure or shutdown occurs using a predictable repairs and maintenance measure.
Construction thermography:
  • Before modification or renovation (to determine the actual state, to estimate what expenditure is required and its scope as well as identifying hidden defects, damp walls, unrecognisable thermal bridges, etc.)
  • After new construction, modification or renovations (for documenting accurate execution or inspection)
  • If damages, errors or weak spots are suspected.
  • Test cycle:
    If possible, approximately every ten years. This is a reasonable timeframe in which to detect changes to the as-new condition and, if necessary, to integrate sensible and technical innovative improvements.
Industrial thermography:
  • Whenever the product or production result regarding heat flux as well as temperature profile and distribution does not comply with the manufacturer's pledge.
  • Whenever proof of accurate functioning and the manufacturer's pledge regarding heat flux as well as temperature profile and distribution for a product is required in product documentation and quality control.
  • Whenever a non-conformance of predefined parameters regarding heat flux as well as temperature profile and distribution is suspected.
  • Whenever optimisation of production facilities regarding heat flux as well as temperature profile and distribution are required.

Thermography - Who to ask?

Electronic thermography:
  • It is recommended to employ a certified electronic thermographer who is approved by VdS (Association of Property Insurers).
  • My qualification/experience:
    - VdS 2859 : 2005-01 CFPA Guideline No. 1,
    Surveyor for Electronic Thermography, Accreditation no. ET 05007
    - DIN EN 473 Z-SC-07419/IT1, Sector E
    - Eight years professional experience
Construction and industrial thermography:
  • It is recommended to employ an experienced thermographer who is trained and qualified according to DIN EN 473.
  • My qualification/experience:
    - DIN EN 473 Z-SC-07419/IT1, Sector B and I
    - Eight years professional experience

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