RayTek 54301 - Manual (Page 35)

Installation
• Ambient background temperature compensation from a second
temperature sensor (infrared or contact temperature sensor)
ensures extremely accurate results. For example, the output of
the second unit, set for mV output, could be connected to the
FTC2 analog input (0 to 5 VDC corresponding to low end and
high end of temperature range) is utilized for real time
compensation, whereby both sensors must be set on the same
temperature range.
Target object
Furnace wall
0 – 5 VDC
analog output
at FTC2 input
Thermal radiation
of ambient
Thermal radiation
of target
Sensor 1
targeted
to object
Sensor 2
targeted
to ambient
Figure 16: Principle of Ambient Background Temperature
Compensation
MID 27