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Constant Watt Heating Cables
Constant wattage heating tape cables are constant watt arrangement designed to put out a certain amount of wattage per meter of cable. These are generally constructed of two #12AWG polymer insulated parallel bus wires with a nickel alloy heating element wire wrapped alternatively along the insulated bus wires. These connections are made at the ‘NODE’ point where the nickel-alloy heating element is either welded or connected by rivets. The entire element assembly is then dielectrically insulated with an additional polymer jacket. The parallel resistor arrangement has two distinct advantages.
The power output per unit length is constant, regardless of the overall length of the heating unit
The parallel arrangement preserves systems probity i.e. if any section of cable should fail, the rest of the heater will continue to work. This is an important advantage over series circuits.
The output ratings of these cables depend on the resistance of nickel alloy wire and the amount used between node connections. These cables can be cut to any convenient length in field within the limits imposed by the maximum heating circuit length, and minimum bus-bar connection interval. When terminated the last 1 meter heater.
Parallel circuit construction.
Standard 120V/240Volts .
Maintain up to 260°C,
Output 15/30/45/60 watt/meter
Cut-to-length in field, simplifies installation;
No High start-up current.
Oil & Grease Industry.
The constant watt heating tapes cables output maintaining higher and more accurate process temperatures easier.
Operates on standard voltages and easily controlled;
System continues to operate even if any element fails;
Available in wide variety of wattage outputs and design temperatures up to 260°C;
Ideally suited for applications where a particular watt density is required at all times such as freeze protection and many other low temperature process control applications. Limitations
Excess heat output may overheat pipe contents; if not controlled, these are susceptible to burnout;
Cannot be used on plastic pipes;
Lower temperature limits than MI cable;
Zone heaters use thinner resistance wires than series heaters and are more susceptible to damage from impact;