Keller ITS CellaPort PT 120, Operating Manual, Page: 20 / 72

Operating manual PT 11x, 12x,13x
14
11.2 Select the material constant
The memory position can optionally be set using the menu.
Temperature measurement (Configuration layer:
C001)
Parameter Function Explanation
E.IDX
Memory position
Shows current selected material constant,
e.g. E.02
12 Further configuration
13 Configuration
– signal conditioning
13.1.1 Transmission factor
The pyrometer has to be adjusted for the transmission properties of any
supplementary lens and/or protective window screwed onto the pyrome-
ter. Set the pyrometer for the specific transmission factor (a percentage
value) which is indicated either in the
product’s data sheet or on the lens
itself. This is parameter
TAU.1
and can be accessed at configuration
layer
C001
. If you are not using any auxiliary lens or protective win-
dow, set the parameter to 100.0.
13.1.2 Background Temperature Compensation
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
C001
/
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 infrared radiation. You
will have to determine these variables first.