Immersion Heaters
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Catalog excerpts

Immersion Heaters

Immersion HeatersWATROD™ and FIREBAR® Screw Plug Immersion Heaters 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...

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Immersion Heaters WATROD and FIREBAR Screw Plug Immersion Heaters Typical Applications • Water: Deionized Demineralized Clean Potable Process • Industrial water rinse tanks • Vapor degreasers Hydraulic oil, crude, asphalt Lubricating oils at API specified watt densities Air and gas flow Caustic solutions Chemical baths Anti-freeze (glycol) solutions Paraffin Screw Plug Orientation WATROD Heating Element Correct element/thermowell orientation assures proper process temperature sensing. Correct horizontal mounting of WATROD and FIREBAR screw plugs is shown below. Correct orientation assures...

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Immersion Heaters WATROD and FIREBAR Screw Plug Immersion Heaters Options Terminal Enclosures General purpose terminal enclosures, without thermostats, are available on all screw plug immersion heaters. To meet specific application requirements, Watlow offers the following optional terminal enclosures: • General purpose with single- or double-pole thermostat • Moisture-resistant or corrosion resistant-available with optional single- or double-pole thermostat • Non-certified, explosion and moisture-resistant combination suitable for use in non-classified areas only-available with optional...

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Immersion Heaters WATROD and FIREBAR Screw Plug Immersion Heaters Options (Continued) Thermocouples ASTM Type J or K thermocouples offer extremely accurate sensing of process and/or sheath temperatures. A thermocouple may be inserted into the thermowell or attached to the heater’s sheath. Thermocouples are standardly supplied with 120 in. (3048 mm) leads. Unless otherwise specified, thermocouples are supplied with temperature ranges detailed on the Thermocouple Types chart. Using a thermocouple requires an appropriate temperature and power controller and these must be purchased separately....

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Immersion Heaters WATROD and FIREBAR Screw Plug Immersion Heaters Options (Continued) Screw Plug Sizes American National Standard Taper Pipe Thread form (NPT) plugs are standard, and in sizes 1, 11/4, 2, and 21/2. To order, specify size and material. Screw Plug to Flange Adapters Screw plug to flange adapters permit replacing flange heaters with screw plug heaters. To order, specify the appropriate part number. Screw Plug to Flange Adapters Application Hints • Select the recommended sheath material and watt density for the substance being heated. Use the Supplemental Applications Chart on...

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Extended Capabilities for WATROD and FIREBAR Screw Plug Immersion Heaters Pilot Light Pilot lights may be attached to either single or double pole thermostats with general purpose or moisture resistant enclosures. For combination moisture and explosion resistant enclosures, contact your Watlow representative.. To order, refer to the Ordering Information on page 217. Wattages and Voltages Watlow routinely supplies screw plug immersion heaters with 120 to 480VAC as well as wattages from 250 watts to 38kW. If required, Watlow may configure heaters with voltages and wattages outside these...

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Immersion Heaters WATROD and FIREBAR Screw Plug Immersion Heaters Optional Moisture Resistant Enclosures With Single-Pole Thermostat With Double-Pole Thermostat 1 and 11/4 inch NPT–1 WATROD Element 11/4 inch NPT–2 WATROD Elements 11/4 inch NPT–1 FIREBAR Element All 2 and 21/2 inch NPT screw plugs Note: The enclosure is not centered on the WATROD screw plug heater. Note: The enclosure is not centered on the screw plug heater. With Single-Pole Thermostat All 2 and 21/2 inch NPT Note: The enclosure is not centered on the screw plug heater. 27⁄8 in. (73 mm) To order: Reference “W” in the...

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Application: Clean Water • 1 inch NPT screw plug • WATROD elements • With thermostat (SPST), Type 2 or 3 • General purpose enclosure Note: All screw plug bundles are designed to fit the inside diameter of C/F - Contact factory, go to www.watlow.com/en/contact-us the equivalent mating coupling. They will not fit into the equivalent pipe inside diameter.

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Application: Clean Water • 1 inch NPT screw plug • WATROD elements • With thermostat (SPST), Type 2 or 3 • Moisture/explosion-resistant enclosure (suitable for use in non-classified areas only) Note: All screw plug bundles are designed to fit the inside diameter of C/F - Contact factory, go to www.watlow.com/en/contact-us the equivalent mating coupling. They will not fit into the equivalent pipe inside diameter. © No third party recognition

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Application: Clean Water • 1 inch NPT screw plug • WATROD elements • Without thermostat • General purpose enclosure • Moisture/Explosion-Resistant enclosure (suitable for use in non-classified areas only) Note: All screw plug bundles are designed to fit the inside diameter of C/F - Contact factory, go to www.watlow.com/en/contact-us the equivalent mating coupling. They will not fit into the equivalent pipe inside diameter. © No third party recognition

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WATROD and FIREBAR Screw Plug Immersion Heaters General Purpose Application: CleanWater • 11/4 inch NPT screw plug • WATROD elements • With thermostat (SPST), Type 2 or 3 • General purpose enclosure • Moisture/Explosion-Resistant enclosure (suitable for use in non-classified areas only) Thermowell 0.315 in. (8 mm) Dia. Element(s) eme in. (34.9 mm) Bundle Note: All screw plug bundles are designed to fit the inside diameter of the equivalent mating coupling. They will not fit into the equivalent pipe inside diameter. 4 Wired for higher voltage © No third party recognition C/F - Contact...

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