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Glass is transparent in the visible spectral range and in the near infrared range. Besides, the emissivity depends on the temperature, the wavelength, the type of glass and the thickness of the glass. In the range between 4.6 ,4.9 µm, glass has an emissivity of almost 100 %. Above 5 µm, atmospheric influences such as humidity or water vapour affect the measurement. The CellaPort PT 115 has a blocking filter with a spectral sensitivity of 4.6 ,4.9 µm. It thus detects the temperature from the area near the surface of the glass. Thickness changes, different types of glass or humidity changes in the atmosphere do not affect the measured value due to the wavelength.
Special features:
- Measuring range 300 to 2,500 °C
- focusable lenses for exact adjustment of the measuring distance
- broadband anti-reflective precision lens
- LED display
- standard feature: USB interface