LumaSense Technologies IN 6/78-L - Manual (Page 16)

IN 6/78-L Operating Manual Controls and Connections · 16
3.5 Avoiding reading errors caused by faulty assembly
To avoid reading errors, please note the following points when mounting the pyrometer:
1. The diameter of the measuring object cannot be smaller than the pyrometer’s spot size (see
section 3.4, Optics).
2. A source of radiation behind or around the measuring object can influence the result. If the
object is transparent or partly transparent, another material behind the object could
transmit its radiation to the pyrometer as well. In this case, the location of the pyrometer
should be changed, or, if the background radiation remains constant it can be compensated
for by changing the emissivity setting respectively.
3. Please take into account that radiation from other hot surfaces around the measured object
can be reflected by the target and influence the result. If the measured object has a low
emissivity, the temperature measured will be mainly that from the reflected object - not
from the intended measured object itself. To prevent ambient radiation from reaching the
spot area, a mounting tube should be used. The mounting tube should be placed as near as
possible to the measured object so that the tube’s shadow blocks out all the ambient
radiation from the side. Consider whether 4.9 Ambient temperature compensating
applies to the measurement application.