Siemens Ardoptix PT 140 AF1, Руководство по эксплуатации, Страница: 23 / 68

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Operating manual
15
15.1.2 Background Temperature Compensation (Spectral mode)
Thermal radiation reflected from the surrounding will require that you
make an additional correction when the reflected radiation is strong
compared to the natural radiation of the target. This applies to object sur-
faces which have very low emissivity or when the temperature of the ob-
ject is lower than the temperature of its surroundings.
The background radiation reflected from the object consists of the follow-
ing factors:

Background temperature

Background size

The capability of the background material to reflect infrared radia-
tion
To ensure that the measurement is not distorted and that the tempera-
ture readings are completely accurate, you should activate "background
temperature compensation" (switch on
C002
or
C003
/
BAC.1
).
Now enter the temperature value of the ambient source of radiation
(
BAC.T
) and its influence as a percentage (
BAC.%
). The influence in
percent stands for the size and the capability of the material to emit infra-
red radiation. You will have to determine these variables first.
15.1.3 Temperature offset using linear interpolation
When necessary, Ardoptix PT allows you to program an offset for the
temperature reading reported. The offset correction can be configured
Source of extraneous radiation
Example: furnace 950 °C
Target object T
O
= 900 °C
Emissivity
e
< 1
Reflection
s
> 0
Furnace radiation T
Back
= 950 °C