Introduction:


The“High value PTC parallel connection electric heating band” also known as alloy PTC parallel connection electric heating band, the patent number is ZL95119695.2, Certificate No.: No. 57856. mainly used in anti-condensing,antifreezing, heat insulation and heat compensation of pipelines,valves,vessels and pipes in the petroleum, chemical, electricity, chemical machinery and all industries.Replace the traditional steam heating, hot water heating.

Technical parameters:


◆　Rated voltage: ≤380V 50Hz/60Hz；
◆　Power range: ≤60W/m；
◆　Power error range: ≤±10%；
◆　Dielectric intensity: single phase 1500V/min,triple-phase 1800V/min；
◆　Heating features: PTC power adjustment；
◆　Power adjustment factor: 1.004（△T）；
◆　Temperature resistance rating: 150℃、205℃、260℃；
◆　Flame retardant；
◆　Explosion-proof level：ExeⅡT4.

Special features:


So-called“PTC”，it is the abbreviation of English version“Positive　Temperature Coefficient”，it is the important area in the　international electric heating elements material research.
“Constant resistance type”（also known as the constant power）electric tracing heating apparatus, can not adjust temperature of　various locations on the traced body surface, the continuous use　will result the electric tracing heating apparatus between the　insulation layer and the trace(insulated) bodies burned due to overtemperature　on some locations with poor heat dissipation.
Electric tracing heating apparatus with PTC feature，when the　temperature rises, its heating elements' own resistance also　increases accordingly（heating power is automatically reduced）;when the temperature drops, its own resistance accordingly　drops(heating power is automatically increased), it is installed and　runs between the heat insulation layer and traced(insulated), it can　dynamically trace the surface temperature of traced(insulated)　bodies, automatically adjusting power of various locations along　the length, so that the traced(insulated) parts can maintain a　constant temperature, also preventing some parts with poor heat　dissipation from burning out due to over-temperature.
Materials with PTC property, not only is the electroluminescent　heating elements, but also is a temperature measuring element and　power adjustment element.

Introduction of typical PTC materials:


I.PTC alloy（such as nickel, cobalt, chromium, niobium and　manganese Ni+Co+Nb+Cr+Mn，iron, nickel Fe+Ni，nickel, cobalt　and silicon Ni+Co+Si etc.）
◆　The maximum working temperature is ＜1000℃（actual working　temperature is determined by the temperature resistance rating of　insulating materials）；
◆　No Curie point, with a wide application range；
◆　PTC feature of the resistance is obvious, it can meet the working　requirements of electric tracing heating apparatus;
◆　No power attenuation phenomenon, PTC feature won't be　affected by the using time；
◆　Flexible, and bendable；
◆　The impact current during starting is small, switching capacity is　small, service life is long.　

II.Macromolecule PTC material（conductive composite materials　made of polyethylene, polyvinylidene fluoride, and other material　incorporated with conductive carbon black）
◆　Temperature resistance ratings are 65℃、85℃、105℃、135℃；
◆　Temperature limiter by Curie point；
◆　PTC feature of the resistance is very obvious;
◆　With the extension of using time, the aging of polymer materials　will remove the memory function of the heating elements and the　power will reduce；
◆　With a greater starting impact current，affecting the length of　usage，if use a large amount of them，it needs a big switching　capacity.　

III.Ceramic PTC material（conductive composite material made ofbarium titanate ceramic incorporated with rare earth elements）
◆　Temperature resistance rating ＜250℃；
◆　Temperature limiter by Curie point；
◆　PTC feature of the resistance is very obvious；
◆　Brittle, can not bend；
◆　With the prolong of using time，the heating power will reduce，and effective working life is thousands of hours；
◆　With a greater starting impact peak current，if use a large　amount of them，it needs a big switching capacity.Thus, the barium titanate ceramic is brittle, not suitable to be used　as heating elements of tracing heating apparatus, the polymer　conductive composite materials have power decline and a greater starting impact current and lower temperature resistance level, it　also is not the ideal material to make electric tracing heating　apparatus.　PTC alloy electric heating material has integrated features in many　aspects, it is an effective approach and development direction of　the high efficiency electric tracing heating apparatus manufacturing.