Dwyer TIC - Manual (Page 78)

77
Appendix
Emissivity table (continue)
Material Temperature（°C）
Emissivity
approximation
Carbon piece 0.85
Isolation piece 0.91～0.94
Sheet metal 0.88～0.90
Glass pipe 0.90
Loop type 0.87
Porcelain enamel
products
0.90
Porcelain enamel
designs
0.83～0.95
Solid materials 0.80～0.93
Ceramics (vase type) 0.90
Film 0.90～0.93
Mica 0.94～0.95
Flume mica 0.90～0.93
Glass 0.91～0.92
Semiconductor 0.80～0.90
Transistor (plastics
sealed)
0.30～0.40
Transistor (metal)
Diode
0.89～0.90
Transmitting loop
Pulse transmission
0.91～0.92
Level chalkiness layer 0.88～0.93
Top loop 0.91～0.92