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WATROD™ TUBULAR HEATERS
FITS VIRTUALLY ENTIRE RANGE OF IMMERSION AND AIR HEATING APPLICATIONS
Available in single- or double-ended termination styles, the versatile and economical WATROD tubular heating element from Watlow lends itself to virtually the entire range of immersion and air heating applications.
The single-ended WATROD tubular heater design has both terminals at one end. The opposite end is sealed. Flexible lead wires are 12 in. (305 mm) crimp connected to the terminal pin and have silicone-impregnated fiberglass oversleeves.
The double-ended WATROD, with its round cross-sectional geometry, are highly adaptable for bending—especially when bending is performed in the field. Watlow’s double-ended MULTICOIL tubular elements offer various combinations of resistor coils and thermocouples inside one sheath. They have the ability to sense the heater’s internal temperature accurately every time, or offer three-phase capability in one element.
Both single- and double-ended WATRODs share many construction features delivering long life—the resistance wire is centered in the heater sheath and electrically insulated with compacted, high-grade magnesium oxide for superior heating performance.
WATROD tubular heating elements have a variety of mounting and termination options making them highly popular among industrial customers.
- Single-ended: UL® and CSA component recognition to 240VAC
- Double-ended: UL® and CSA component recognition up to 600VAC
PRECISION WOUND NICKEL-CHROMIUM RESISTANCE WIRE
Distributes heat evenly to the sheath for optimum heater performanceSILICONE RESIN SEALS
Protects against moisture contamination and is rated to 221°F (105°C)MGO INSULATION FILLED SHEATH
Maximizes dielectric strength, heat transfer and lifeSTANDARD SHEATH MATERIALS
Steel, 304 and 316 stainless steel, alloy 800/840 and alloy 60053 STANDARD BEND FORMATIONS
Allows forming the heating element to the application. Spirals, compound bends and multi-axis and multi-plane configurationsSTAINLESS STEEL STUDS
Fusion welded to terminal pins for mechanical strength -
FINBAR™ SINGLE- ENDED HEATERS
DESIGNED TO IMPROVE HEAT TRANSFER TO THE AIR
Composed of aluminized steel fins press-fitted to a one-inch single-ended FIREBAR element, the FINBAR finned tubular heater is designed to improve heat transfer to the air and permits putting more power in tighter spaces—like forced air ducts, dryers, ovens and load bank resistors.
Heat transfer, lower sheath temperature and element life are all maximized by the FINBAR heater’s finned construction. Installation is simplified by terminations exiting at one end and mounting accommodations on both ends.
- Rugged aluminized steel fins increase surface area to improve heat transfer to air
- Single-ended termination simplifies wiring and installation
- Stainless steel mounting bracket for ease of installation
- Lavacone seals provides protection against humid storage conditions – moisture retardant to 221°F (105°C)
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PLATE FLANGE IMMERSION HEATERS
Watlow plate flanged heaters are easy to install and maintain. These flanged heater products are designed for heating heat transfer fluids, medium and lightweight oils and water in tanks and pressure vessels. Plate flanged heaters are ideal for applications requiring low to medium wattage requirements.
Watlow plate flanged heaters are made with WATROD tubular elements that are brazed or welded to the flange. Stock plate flanged heaters are supplied with general purpose or moisture-resistant terminal enclosures.
- Rapid ship program minimizes downtime
- Direct replacement for many OEM mold temperature control units provides a single-source supplier for many OEM application
- ANSI compatible 2 and 2½ inch flanges for appropriate heater size-to-application fit
- Standard, general purpose, or moisture resistant terminal enclosures to easily control access to wiring
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WATROD™ AND FIREBAR® SCREW PLUG IMMERSION HEATERS
IDEAL FOR DIRECT IMMERSION HEATING OF LIQUIDS
Screw plug immersion heaters are ideal for direct immersion heating of liquids, including all types of oils and heat transfer solutions.
Available in a variety of sizes, Watlow screw plug immersion heaters feature both WATROD round and FIREBAR flat tubular elements.
Heating elements are hairpin bent and either welded or brazed into the screw plug, depending on element sheath and plug material compatibility.
General purpose terminal enclosures are standard with optional moisture resistant, explosion resistant and explosion/moisture resistant enclosures available to meet specific application needs.
Optional thermostats provide convenient process temperature regulation to the screw plug immersion heater.
- UL® and CSA component recognition
- A variety of element sheath and screw plug materials to meet your application needs
- Integral thermowells provide convenient temperature sensor insertion and replacement without draining the fluid being heated
- Terminal enclosures provide ability to be rotated to simplify connection with existing conduits
- Welding or brazing WATROD and FIREBAR elements to the screw plug for a pressure tight seal
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FIREROD® CARTRIDGE HEATERS
FIREROD CARTRIDGE HEATERS ARE THE PREMIER CHOICE IN SWAGED CARTRIDGE HEATING
The FIREROD cartridge heater revolutionized the heating element industry in 1954 when it was patented as the first swaged cartridge heater. The mechanical procedure of swaging reduces the diameter of the heater by compacting the unit; this directly improves the heat transfer and efficiency of the heater.
FIREROD cartridge heaters are built using only the finest materials and construction methods and are backed with extensive quality assurance programs. With premium materials and tight manufacturing controls, the FIREROD heater provides superior heat transfer, uniform temperatures, resistance to oxidation and corrosion and a long life even at high temperatures.
FIREROD offers many delivery programs to meet your needs.
- Nickel chromium resistance wire ensures even, efficient distribution of heat to sheath
- Magnesium oxide insulation of specific grain and purity results in high dielectric strength and faster heat-up
- Alloy 800 sheath resists oxidation and corrosion from many chemicals, heat and atmospheres
- Minimal spacing between element wire and sheath results in lower internal temperatures and accommodates design with fewer or smaller heaters
- UL® and CSA approved flexible stranded wires with lead insulation rated to temperatures of 480°F (250°C)
PATENTED LEAD ADAPTER (LA) METHOD
Allows same day shipment on more than 150,000 configurations of stock FIREROD heaters and lead combinationsINTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) 9001 CERTIFIED
Provides confidence that quality and reliability expectations are metCONDUCTOR PINS
Provides a metallurgical bond to the resistance wire and ensures trouble-free electrical connection
Material Maximum Operating TemperaturesF°C°Maximum Watt DensitiesW/in2W/cm2Alloy 800 1400 760 400 62 Stainless Steel 1000 538 400 62 -
Ceramic Band Heaters
Ceramic band heaters are, in effect, high temperature electric furnaces capable of very efficient heat transfer by radiation, conduction and convection. Built-in insulation minimizes unwanted temperature changes along the barrel.
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Coiled Cable Heaters
Coiled cable heaters are the ultimate design in coiled type heaters. Their design and technical development gives them a longer lifespan than the competition, due to special features including:
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Mica Band Heaters
Mica Band Heaters are best suited for low to moderate temperatures, featuring thin construction and high quality insulation for effective heat transfer and excellent dielectric properties. They offer a wide variety of termination and clamping styles.
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Mica Strip Heaters
Versatile, efficient and economical, the Mica Strip Heater is of the same construction as the Mica Band Heater in flat design.
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Mineral Insulated (MI) Band Heaters
The MI band heater from Watlow® is a high-performance heater.
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MINERAL INSULATED NOZZLE HEATERS
FEATURING WATLOW’S EXCLUSIVE MINERAL INSULATION (MI) TECHNOLOGY
The MI nozzle heater from Watlow is a high-performance heater. The nozzle heater’s performance and name are derived from Watlow’s exclusive mineral insulation—a material with a much higher thermal conductivity than mica and hard ceramic insulators used in conventional heaters.
A thin layer of the “high” thermal conductive MI material is used to electrically insulate the element wire from the inside diameter of the heater sheath. A thicker, “low” thermal conductivity layer backs up the element wire, directing the heat inward toward the heated part. The result is more efficient heat transfer—a performance solution lowering element wire temperatures and increasing heater life.
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MINERAL INSULATED STRIP HEATERS
THIN, RESPONSIVE HEATER SETS STANDARDS FOR PERFORMANCE AND DURABILITY
The MI strip heater is a thin, responsive heater that uses the most advanced heater construction techniques. A nickel-chromium element wire is embedded in Watlow’s exclusive mineral insulation material, which has a much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters. This thin layer of insulation brings the element wire closer to the heater sheath. The result is heat flows easily from the element wire to the sheath allowing the wire to run cooler than conventional heaters and increasing heater life.
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