Raytek has added to its Marathon
pyrometer series a model for use in
the production of thin glass. The
MMG7 sensor measures
infrared radiation at
a wavelength of
7.9µm. The
company has
precisely adjusted
the measurement
spectrum to the
reflecting medium and to the 300 to
900°C measured temperature range.

Raytek says that at shorter
wavelengths, background radiation
could distort results, while surface
reflection is too strong in
the longer-wave area.

The point sensor has a
100:1resolution, and
achieves a precision of ±
1% and a repeatability of ±
0.5% or ± 0.5°C. With a
response time of just 120ms,
the device is said to deliver reliable
data even in very fast processes.