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How To Achieve The Best Temperature Measurement Accuracy From Your Cyclops L?

Thursday, July 1, 2021 | Manfred Hayk
Categories : Products

Like all other measuring instruments, the Cyclops L Portable Non-Contact Thermometer has an accuracy stated in its technical specifications. 

 CO55L  <±0.5% (K) 
 C100L  ≤±0.25% (K)
 C160L  ± 0.25% C + 2 °C  
 C390L  ±0.5% (K)  


These accuracies are fully verifiable and traceable to national and international standards. 


The instruments are calibrated in accordance with controlled procedures, governing the calibration condition, and the use of standards and equipment traceable to national and international standards.

The accuracies specified are based on readings taken from a traceable blackbody radiation source with effective emissivity 1.00.


Once the pyrometer is transferred to an industrial application, additional influences can affect the instrument's reading. These additional errors are not from the instrument itself but operator settings and application conditions and are called "systematical errors".

These systematical errors can reduce measurement accuracy.

What can increase systematical errors?

  • An incorrect emissivity setting can lead to measurement error.  C055L, C100L and C160L have excellent sensitivities, which can help minimise the magnitude of error associated with incorrectly estimated emissivity settings. The C390L has other application benefits.
  • An "estimated" emissivity value is set in the Cyclops L pyrometer, but the object's emissivity changes (e.g., by growing or changing oxide layers). We recommend that the emissivity setting is determined and fixed for measurement points within the application. 
  • There is steam or dust within the instrument's field of view, and the optical path is being obscured or obstructed.
  • The FOV is not being completely filled.  We recommend a target area >20% than the minimum specified target size where possible to make alignment much easier, reducing systematic error.
  • Poor care and handling, the instruments protection window should be kept clean, and the instrument stored carefully when not in use. Although portable and designed for Industrial applications, the very nature of its portability can make it susceptible to unseen and unreported damage.

What steps to take to minimise systematical errors:

  • Using the Cyclops L pyrometer to measure a surface temperature, of which the emissivity is well known and set to the correct emissivity within the instrument.
  • Not having any obstructions in the optical path, like dust, steam, obstacles, dirty optics, emissivity changes, low viewing angles or background reflections.
  • Using the Average or Peak temperature measuring mode to eliminate some of the errors. 
  • Clean the protection window before use.
  • A systematic approach to measurement, choose your target, set the focus, set the mode (continuous, peak or average). Point and shoot record the reading you see in the viewfinder. (Do not go hunting unless you are surveying an area). 
  • Store the Cyclops in its protective case when not in use.
  • An annual calibration or certification, combined with preventative maintenance, will ensure optimal operating performance from your temperature measurement systems, improving the accuracy of your measurement capability and meeting required national and international quality standards. 
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