RADIANT HEATING WITH INFRARED - Watlow

Wiring
Do not use copper wire or ring terminals when wiring radiant heaters.
Backside temperatures can reach 500°F or higher in enclosed ovens. Use
nickel or nickel clad wire of the proper size and derated for the ambient
temperatures. Heaters should be properly grounded.
Contamination
Some constructions are contamination resistant. Other heaters will be
damaged by contaminants. When drilling holes in the mounting frame work,
the heaters must be protected from metal shavings.
Vibration
Continuous vibration will break down the electrical insulation in most heater
constructions. Consult Watlow. If the heaters are indexed back and forth, they
must not slam to a stop when they reach the end of their travel. Dampers or
shock absorbers should be used to bring the heaters to a gentle stop.
Conclusion
Radiant heating with infrared can be a powerful production tool that speeds
up processes, improves quality and reduces energy consumption. Successful
radiant systems can be designed by understanding the physical elements
involved i.e., radiated power, view factor and emissivity. Good results require
reasonably accurate values for material emissivities, mass, and specific heat.
Run test when possible.
Watlow has been providing assistance and supplying components for radiant
systems for over 25 years. We are at your service.
Did you find this publication useful? Do you have any suggestions on how it
might be improved? If so, please write or fax to:
Chad Murphy
12001 Lackland Road
St. Louis, MO 63146
FAX: (314) 878-6814
If contaminants, such as water, oil, or
plastic, are likely to fall in the heater,
consult Watlow before specifying a
heater type.
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