Hioki 3415-01, Instruction Manual, Page: 74 / 79

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Chapter 4 Maintenance and Service
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Q: Why can't I me a s u r e t h e t emp e r a t u r e of a
gas, vapor, or flame?
A: Since gases, vapors, an d flames ar e
t r a n s p ar en t to infrared radiation, th eir
t emp erat u r es cannot be measured in this
way.
Q:
Why can't I meas u r e t emp er at u r e throu gh
r a i n or fog?
A:
Since r ai n an d fog reflect an d absorb infrared
radiation, accurate measu r eme n t throu gh
t h em is impossible.
Q: Doesn't t h e measu r eme n t distance affect t h e
resulting measured value for t emperatu re?
A: Air hard ly absorbs a t all infrared radiation of
t h e wavelengths (8 to 16
μ
m) used by this
device for t e mp er a t u r e me a su r e men t .
Therefore accurate t e mp er at u re mea su r e me n t
is possible, irrespective of t h e measu r eme n t
distance.