Heater Catalog - Watlow

Tubular HeatersExtended Capabilities ForFIREBAR Single/Double-Ended HeatersInternal ThermocouplesTo provide protection against element over-temperatureconditions, 1 in. (25 mm) double-ended FIREBARelements can be ordered with ASTM Type Kthermocouples. This is accomplished by eliminating thecenter resistance coil and embedding the thermocouplejunction inside the sheath. Thus, thermocouples areavailable only on two resistance coil, 1 in. (25 mm)FIREBAR elements.To order, specify:• Type K thermocouple• Distance the junction is to be located from theelement’s end• Lead lengthThermocouple TypesASTM ConductorType PositiveK Chromel ®(Non-magnetic)CharacteristicsNegativeAlumel ®(Magnetic) 9/16" (14 mm)FBAR NEW BULKHEADSRecommendedTemp. Range°F (°C)0 to 2000(-20 to 1100)aType K thermocouples are rated 32 to 2282°F (0 to 1250°C). Watlowdoes not recommend exceeding the temperature range shown onthis chart.9/16" (14 mm)ExtendedCapabilityOptions for 5 ⁄8-Inch FIREBAR• Electropolished finish• Custom formations• Cordset• Termination overmolds (silicone or neoprene)• Terminal enclosures (general purpose, moistureresistant, moisture/explosion resistant and explosionresistant)• Internal thermocouple (dual end only, single or dual coil• Custom wattage tolerance (±5%)Options for One-Inch FIREBAR• Electropolished finish• Bulkhead, single leg• Custom formations• Cordset• Termination overmolds (silicone or neoprene)• Terminal enclosures (general purpose, moistureresistant, moisture/explosion resistant and explosionresistant)• Internal thermocouple (dual end only, single or dual coil)• Custom wattage tolerance (±5%)Mounting BracketsThreaded BulkheadsA threaded stainless steel bushing with flange on theheater sheath provides rigid, leak-proof mountingthrough tank walls. A gasket, WATROD plated SECT steel washer andhex nut are included (brazed only, available).To order, specify threaded bulkheads.1 1 /4 in.(32 mm)15/16 in. (23.8 mm)3/4 in.(19 mm)GasketWallWasherNut1 1 /4 in.(32 mm)3/16 in.(4.8 mm)Illustration for 1-inch FIREBARrut1 1 /4 in.(32 mm)Heater Size Threadin. (mm) Size5 /8 (15.9) 7 /8-14 UNF-2AIllustration for 5 ⁄8-inch FIREBAR1 /8" (3mm) 9/16" (14 mm)No ThreadsGasketWallWasherNut9/16"(14 mm)106 3 /4"(18 mm)WATLOW ®2 1 /4"(57mm)1 (25.0) 3 /4-16 UNF-2A