Positive Temperature Coefficient

What is PTC?

How to transfer heat from a PTC heating element

PTC element heat transfer   Medical Laboratory Maintains Temperature with PTC Heating Elements   The ceramic heating element designed with PTC, positive temperature coefficient, characteristics require a heat transfer medium to move the heat from the component to the material requiring heat.  The heat transfer design is dependent on the material, distance, and surface area. Heat transfer is heat moving from a warmer object to a cooler thing.  Heat is a measure of the kinetic energy possessed by an item.  The heat measure of an object changes with time until equilibrium between the warmer and cooler things.   Conductive heat...

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How does a PTC heater work?

Traditional resistive element heating

Resistance in a circuit produces thermal energy, which equates to heat.  Nichrome, a non-magnetic alloy of nickel and chromium, is one of the most common resistance wires.  The material has a high resistance to current and oxidation at high temperatures. Other materials and alloys are used for specific applications to create heat with some coated with heat-conducting materials that protect the elements from oxidation at high temperatures. Typical lengths of each type of wire produce the desired heating.  

Forced air or natural convection heat exchangers are utilized to transfer heat to the atmosphere, solids, and liquids.  This heating device has long been used for electrical heating in homes, transportation, and industrial applications.  The resistance is chosen concerning temperature requirements, voltage, and current.  In most applications, temperature sensors and current-limiting components are required to maintain the proper temperature.The current through such wire resistors is nearly constant and does not change with temperature, nor does the wire's resistance.

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PTC Fan Heaters

OTC PTC Fan Heaters for Electronic Enclosures Positive Temperature Coefficient heaters are becoming increasingly common in the military, industrial, commercial, and home applications. The unique characteristics of rapid heating and maximum temperature with little or no control circuitry provide efficient heating.

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PTC Finned Heaters

PTC Finned Heaters for Industrial Applications PTC finned, air, or convection heaters, contain ceramic disks that utilize positive temperature coefficient (PTC) technology that is safer, more efficient, and reliable than traditional electric resistance heating elements.

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PTC Element Cartridge Heaters

New PTC ceramic heating elements improve the efficiency of typical resistive heating elements used in immersible applications where optimal heat transfer is required.

The PTC, Positive Temperature Coefficient, the heating element is built into exceptionally corrosive resistant stainless steel casing.  Unlike the picture of a resistive element without protective casing.

The compact & robust circular provides 360° heat transfer.  The PTC functionality is self-regulating and will not overheat.  

Cartridge heaters are often confused with tubular heaters.  A cartridge heater is designed to be inserted into a die or vessel wall by screw mount.    

Tubular heaters can have more complex geometries and may be welded or permanently attached or clamped to a vessel requiring heating.  

Both types of heaters usually contain electrical resistance heating elements insulated from the surface of the heater.  PTC ceramic heating elements are self-limiting and voltage self-insulating, providing more efficient heat transfer.

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