Page 203 - An Introduction To Predictive Maintenance

Thermography 193

Switch A device used to open, close, or redirect
current in an electrical circuit.
Three-phase An electrical system with three different
voltage lines or legs, which carry sine-
wave waveforms that are 120 degrees out
of phases from one another.
Transformer A device used to change the voltage of an
AC circuit and/or isolate a circuit from its
power source.
Volt Electrical unit of measure (Current ¥
Resistance).
Watt The unit for measuring electrical power or
work. A watt is the mathematical product
of amperes and volts (W = A ¥ V).

APPENDIX 8.4 Materials List

Material °F °C Emissivity
Metals
Alloys 20-Ni, 24-CR, 55-FE, 392 200 0.9
Oxidized
20-Ni, 24-CR, 55-FE, 932 500 0.97
Oxidized
60-Ni, 12-CR, 28-FE, 518 270 0.89
Oxidized
60-Ni, 12-CR, 28-FE, 1040 560 0.82
Oxidized
80-Ni, 20-CR, Oxidized 212 100 0.87
80-Ni, 20-CR, Oxidized 1112 600 0.87
80-Ni, 20-CR, Oxidized 2372 1300 0.89
Aluminum Unoxidized 77 25 0.02
Unoxidized 212 100 0.03
Unoxidized 932 500 0.06
Oxidized 390 199 0.11
Oxidized 1110 599 0.19
Oxidized at 599°C (1110°F) 390 199 0.11
Oxidized at 599°C (1110°F) 1110 599 0.19
Heavily Oxidized 200 93 0.2
Heavily Oxidized 940 504 0.31
Highly Polished 212 100 0.09
Roughly Polished 212 100 0.18
Commercial Sheet 212 100 0.09
Highly Polished Plate 440 227 0.04
Highly Polished Plate 1070 577 0.06
Bright Rolled Plate 338 170 0.04