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HIGH-TEMPERATURE TUBULAR HEATERS
IDEAL FOR PROCESS AIR HEATING APPLICATIONS REQUIRING HIGH TEMPERATURES
Watlow manufactures high-temperature tubular heaters to bridge the gap between standard tubular heaters and Watlow MULTICELL™ heaters. This high temperature heater is well suited for process air heating applications in excess of 1300˚F (704˚C), resulting in a maximum sheath temperature of 1800˚F (983˚C). Controlled lab testing between the new design and current tubular designs shows an increase in life of approximately 50 percent.
The high-temperature heaters consist of an engineered tubing with an outer sheath of Alloy 600 and a special internal construction. The outer sheath offers high temperature capabilities, reduced oxidation as well as corrosion resistance.
The tubular heater offering is available in 0.430 and 0.375 inch diameters that are configurable either as formed tubulars or process heaters. The tubular heaters can also be welded to flanges and plates for mounting purposes. Maximum sheath length available is 275 inches for the 0.430 inch and 0.375 inch diameters. The factory should be contacted for longer sheath lengths.
- Alloy 600 sheath material and a special internal construction maximizes performance and corrosion protection in tough applications
- Dual-ended termination Installs into flanges and screw plugs similarly to standard product configurations
- Bendable in standard formations makes the heater easy to apply in a wide variety of applications
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LDH SERIES AND D SERIES DUCT HEATERS
EASILY ADAPTED TO MANY NON-PRESSURIZED AIR HEATING SYSTEMS
Watlow duct heaters are constructed of sturdy 0.430 in. (11 mm) diameter WATROD heating elements mounted to a 1⁄4 in. (6 mm) thick steel flange. These air duct heaters are easily adapted to many non-pressurized air-heating systems.
Duct heaters are easily installed in applications requiring a wide range of temperature versus air flow combinations.
The modular duct heater offers increased reliability. The individual modules are removable through the housing of the assembly, which eliminates the need to pull the complete heater from the ductwork. This reduces downtime costs because the heating elements can be replaced individually. Performance improvements include quicker response time and reduced infiltration from the air stream being heated into the electrical enclosure.
Watlow air duct heaters offer advantages over gas or oil fired and open coil electric units with:
-Installation flexibility—no flues or fuel lines
-100 percent energy efficient—no energy loss up the flue
-Universal availability of electricity
-Resistance coil in sheath is protected from corrosive environments
-Duct heaters with general purpose enclosures meet UL® and CSA component recognition to 480 and 600VAC maximum respectively—UL® and CSA file numbers are E52951 and 31388.- Long life alloy 800 sheath resists corrosion/oxidation while protecting resistance coils against contamination
- MgO insulation filled elements compacted to rock hard density maximizes dielectric strength, heat transfer and life
- Field replaceable heating elements permits easy service and reduces downtime
- General purpose terminal enclosure offers easy access to wiring
- WATROD hairpins are recompacted after bending to eliminate hot spots and electrical insulation voids
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METRIC FIREROD METRIC CARTRIDGE HEATERS
CARTRIDGE HEATER BUILT TO MEET THE SPECIFICATIONS OF THE GLOBAL MARKET
The Watlow FIREROD not only sets the industry standard for cartridge heaters, but continues to make improvements in construction and design. Among those improvements is the FIREROD metric cartridge heater, a variation of the FIREROD cartridge heater built to meet the exact specifications of the global market.
Like its counterpart, the metric FIREROD consistently outperforms other cartridge heaters with its design solutions such as its exclusive resistance wire winding and swaging process. These processes bring the resistance wire closer to the sheath and compacts the MgO insulation to maximize heat transfer. The end result is longer service life and better efficiency.
- 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 250°C (480°F)
NICKEL-CHROMIUM RESISTANCE WIRE
Assures even and efficient distribution of heat to the sheath because the wire is precisely wound and centered in the heaterCONDUCTOR PINS
Ensures a trouble-free electrical connection because of the metallurgical bond between the conductor pins and resistance wireMAGNESIUM OXIDE INSULATION OF SPECIFIC GRAIN AND PURITY
Results in high dielectric strength and contributes to faster heat-upALLOY 800 SHEATH
Resists oxidation and corrosion from many chemicals, heat or atmospheresUL® AND CSA APPROVED FLEXIBLE STRANDED WIRES
Insulates the wires to temperatures of 250°C (480°F)MINIMAL SPACING BETWEEN THE ELEMENT WIRE AND SHEATH
Results in lower internal temperatures and accommodates design with fewer or smaller heaters
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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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MILLED GROOVE TUBULAR HEATERS
PRECISION FORMED TO YOUR HOT RUNNER MOLD APPLICATIONS
WATROD milled groove heaters are precision-formed and customized to your hot runner mold application. Even tight radius bends of 0.250 inch maintaining tolerances of ±0.062 to ±0.002 inch are possible. This capability not only allows you freedom to design for the optimum uniform heating pattern for your plastics process, but also guarantees quick and easy installation.
Simply send your groove dimensions in a detailed drawing or on CAD file. Depending on the formation requirements, the resulting CAD design will be transferred to either Watlow’s CNC bending equipment or a highly skilled bending operator.
A variety of sheath materials are available including alloy 800, 304 stainless steel and 316 stainless steel, each offering unique advantages of long life in high temperature molds, rigidity to maintain shape during shipment and corrosion resistance.
Watlow not only delivers the heat fast to the process with efficient heat transfer, but guarantees the heater’s fast delivery, too. While Watlow guarantees standard delivery within three to four weeks, tough delivery schedules are Watlow’s specialty.
- Precise conformity to customer specifications ensures easy installation
- Alloy 800 sheath material are corrosion resistant and capable in high-temperature environments
- 304 stainless steel features excellent pliability – best choice for small bend radii
- Superior resistance coil design produces even heating
- Threaded stud or lead wire termination as required provides robust options for challenging environments
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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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MULTICELL™ INSERTION HEATERS
EFFICIENT HEAT DISSIPATION AND LONG LIFE TO MEET YOUR HIGHEST DEMANDS
The advanced design of the MULTICELL heater from Watlow offers three major advantages over other insertion heaters: extreme process temperature capability, independent zone control for precise temperature uniformity and loose fit design for easy insertion and removal.
- Multiple, independently controllable zones for process temperature uniformity
- Radiant design of heater permits easy removal and replacement with minimal downtime
- Oxidized sheath improves heater performance as oxidation increases
- Quick disconnect plug and jack enables quick replacement of individual elements while maintaining operating temperature
- Special bending capabilities solves unusual machinery needs
INDIVIDUALLY METAL-SHEATHED COILS SWAGED INTO A LARGER, HIGH-TEMPERATURE ALLOY OUTER SHEATH
Provides maximum protection against element burnout through the outer sheathFLEXIBLE LEADS UP TO 842°F (450°C)
Protects termination from high-temperature environmentMULTIPLE, INDEPENDENTLY CONTROLLABLE ZONES
Allows process temperature uniformity not possible with any other single-sheathed heaterRADIANT DESIGN OF HEATER
Permits easy removal and replacement with minimal down time since it will not bind or seize in the holeQUICK DISCONNECT PLUG AND JACK
Permits fast replacement of individual elements while the press stays at operating temperatureSPECIAL BENDING CAPABILITIES
Solves unusual machinery needs and keeps leads away from heated zones -
MULTICOIL™ HEATERS
MULTIPLE COILS AND THERMOCOUPLES PACKAGED IN ONE SHEATH FOR QUICK INSTALLATION
The MULTICOIL heater tubular element with multiple coils and/or thermocouples inside one sheath answers the need for a versatile, innovative tubular multiple coil heater. Watlow’s patented method of packaging a thermocouple inside of a heater with one or more resistance coils gives the ability to sense a heater’s internal temperature accurately, every time.
Moreover, this is the first tubular heater in the industry with three-phase capability. The three coil, three-phase heater will offer a compact package solution while delivering the full power required in a compact heater package. Previously three separate heaters would have been required to do the same job; therefore Watlow’s MULTICOIL heater capabilities save money.
- Three-phase capability results in one element versus three, lower amperage, reduced installation time and lower overall cost
- Multiple coil operations reduces inventory by allowing dual voltage capability
- Versatile forming capabilities forms into many configurations
- Internal thermocouple construction eliminates contamination buildup around the external sensing tip, reducing the possibility of false readings
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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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