LumaSense Technologies M310 - Manual (Page 30)

M310 Manual Appendix B: Calibration Methods 30
Example 1: The HT (450 C) blackbody was factory calibrated to provide effective emissivity =
1.0 at 8-14 µm. You wish to use this source for a narrow band pyrometer at 7.5µm. At this
wavelength from the graph above, the blackbody exit radiance will be approximately equivalent
to a blackbody that has emissivity = 1.011. This will cause your pyrometer to receive 1.1% more
infrared energy causing it to read a higher temperature. The table below shows the expected
error. At 250 C, this pyrometer will read 251.4 C or 1.4 C high, so you should set the
blackbody setpoint to 248.6 C (250-1.4).
Normalized emissivity after 8-14um radiance calibration on the HT (450C) version
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
1.01
1.02
0 5 10 15 20 25 30
e