Quartz Tubular Elements
The heater consists of a helically wound resistance wire coil enclosed in a pure vitreous silica fused quartz tube with a translucent (semi-opaque) surface. The tubing is terminated at the ends with specially designed ceramic caps securely fastened with high temperature ceramic cement providing support for the field wiring screw terminals used for power connections. The diffusion effect of the opaque quartz tube surface broadens the emitted wavelength range without creating objectionable glare due to emissions in the visible spectrum. Optimum design provides a clear red color on the translucent tube surface when operating at full line voltage. The emitted wavelength band is almost completely absorbed by the process and considered best for most industrial radiant applications.
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Element Wavelengths
Radiant Quartz Heaters
Max. Volts: 480 Volts
Max. Amperage: 20 Amps
Resistance Tolerance: +10%, −5%
Wattage Tolerance: +5%, −10%
Max Watt Density: 40 Watts/sq. in.
Construction Styles
Type KRD Vitreous Silica Quartz Tube
To achieve best operating life, these quartz heaters shoudl be operated with surface watt densities in the 35-40 watts per square inch range, not exceeding the maximum power densities specified below.
Type KRH Radiant Heaters in Linear Housing
Designed for use in applications that require rapid on/off response and fast heat-up and cooldown rates. These heater assemblies are designed to operate in the medium wavelength range of 4.0-2.4 microns (700 to 1715°F peak emitter temperatures).These Modular Housing assemblies utilize a .50 diameter translucent “milky white” vitreous quartz tube enclosing a high temperature resistance wire coil. The diffusion effect of the translucent quartz tube surface broadens the emitted infrared wavelength range obtained without objectionable glare due to low emissions in the visible spectrum. The units have either single or dual heaters mounted at the focal point of a polished aluminum reflector within the housing. These heater assemblies are available in a wide range of power densities.
Type ARK Panel Arrays
Custom 4″ high Type ARK panels with 1/2″ diameter quartz elements are available. Tempco will design and build to your specifications. Consult us with your requirements.
Mounting Styles
Heater Clamp
Optional 90° Lead Orientation, Shown with Optional End Mounting Clamp
Mounting Clamp
Mounting Clamp for 3/8 Quartz Tube OD
Part Number: CRK00059
Electrical Terminations
Type T1: Screw Terminal (Standard)
10-32 thread screw terminal standard termination.
Type T2: Panel Mount Bushings
10-32 thread screw terminals with extension bushings for CRA/TRH housing assemblies.
Type ST: Tabs with Slotted Holes
1/2″ wide × 3/4″ long, with a 9/32″ × 3/8″ slot. Alternate mounting method.
Type FT: Quick Disconnect Fuse Type
Fuse-type connector provides ease of installation. Connectors are 3/8″ OD × 1/2″ long brass.
Type L1: Straight-Out Leads
10″ flexible lead wire externally spliced standard. If longer leads are required, specify.
Type C4: Ceramic Caps with Leads
This termination provides 10-32 screw terminals insulated with ceramic terminal covers. Screws are prewired with 10″ flexible lead wire. If longer leads are required, specify (also for T1 or T2).