Heater Catalog (Section) - Immersion Heaters - Watlow

Immersion HeatersWATROD and FIREBAR Screw PlugImmersion HeatersApplication: Bunker C, Asphalt2.50" FIREBARand #6 Fuel Oil• 2 1 2.50" FIREBAR/2 inch NPT screw plug• FIREBAR elements• With thermostat (DPST)• General purpose or moisture/explosionresistantenclosure2323General Purpose5½ in. Dia.5½ (140 in. mm) Dia.(140 mm)71⁄16 in. Dia.(179.4 71⁄16 in. mm) Dia.(179.4 mm)¾ in. NPT Knockout¾ in. NPT Knockout (3) 1 in. (25 mm) FIREBAR Elements(3) 1 in. Thermowell (25 mm) FIREBAR ElementsThermowell2½ in.(64 2½ mm) in.Bundle (64 mm)Bundle33⁄8 in. (85.7 mm) Cold (Ref.)33⁄8 in. (85.7 "B" mm) Cold (Ref.)"B"Moisture/Explosion-1½ in. NPT HubsResistant1½ in. NPT Hubs(3) 1 in. (25 mm) FIREBAR Elements(3) 1 in. Thermowell (25 mm) FIREBAR ElementsThermowell2½ in.75⁄8 in. Dia.2.50" FIREBAR(64 2½ mm)24(193.7 in.75⁄8 in. mm) Dia.Bundle2.50" FIREBAR(64 mm)24(193.7 mm)Bundle33⁄8 in. (85.7 mm) Cold (Ref.)85⁄8 in. Dia.33⁄8 in. (85.7"B"mm) Cold (Ref.)(219.1 85⁄8 in. mm) Dia."B"(219.1 mm)Type 5A (60-250°F)Type 7A (100-550°F)“B” Dim. Ship Wt.PartPartDescription Volts kW Ph in. (mm) lbs (kg) Number Del. Number Del.General Purpose Enclosure8 W/in 2 3 240 1.25 3 15 1 /8 (384.2) 11 (5) BLNF15C22S5A RS BLNF15C22S7A RS304 SS Plug3-Alloy 800240 1.63 3 18 1 /8 (460.4) 13 (6) BLNF18C22S5A RS BLNF18C22S7A RSElements 240 2.13 3 23 1 /8 (587.4) 15 (7) BLNF23C22S5A RS BLNF23C22S7A RS(1.3 W/cm 2 ) 480 2.13 3 23 1 /8 (587.4) 15 (7) BLNF23C21S5A RS BLNF23C21S7A RS240 2.63 3 28 5 /8 (727.1) 18 (9) BLNF28L22S5A RS BLNF28L22S7A RS480 2.63 3 28 5 /8 (727.1) 18 (9) BLNF28L21S5A RS BLNF28L21S7A RS240 3.19 3 33 5 /8 (854.1) 19 (9) BLNF33L22S5A RS BLNF33L22S7A RS480 3.19 3 33 5 /8 (854.1) 19 (9) BLNF33L21S5A RS BLNF33L21S7A RS240 4.25 3 44 1 /8 (1120.8) 21 (10) BLNF44C22S5A RS BLNF44C22S7A RS480 4.25 3 44 1 /8 (1120.8) 21 (10) BLNF44C21S5A RS BLNF44C21S7A RS240 5.38 3 54 5 /8 (1387.5) 23 (11) BLNF54L22S5A RS BLNF54L22S7A RS480 5.38 3 54 5 /8 (1387.5) 23 (11) BLNF54L21S5A RS BLNF54L21S7A RS®®8 W/in 2 3304 SS Plug3-Alloy 800Elements(1.3 W/cm 2 )RAPID SHIP• RS - Next day shipmentup to 5 piecesMoisture/Explosion-Resistant Enclosure 7240 1.25 3 15 1 /8 (384.2) 14 (7) BLNF15C22C5A RS BLNF15C22C7A RS240 1.63 3 18 1 /8 (460.4) 16 (8) BLNF18C22C5A RS BLNF18C22C7A RS240 2.13 3 23 1 /8 (587.4) 18 (9) BLNF23C22C5A RS BLNF23C22C7A RS480 2.13 3 23 1 /8 (587.4) 18 (9) BLNF23C21C5A RS BLNF23C21C7A RS240 2.63 3 28 5 /8 (727.1) 21 (10) BLNF28L22C5A RS BLNF28L22C7A RS480 2.63 3 28 5 /8 (727.1) 21 (10) BLNF28L21C5A RS BLNF28L21C7A RS240 3.19 3 33 5 /8 (854.1) 22 (10) BLNF33L22C5A RS BLNF33L22C7A RS480 3.19 3 33 5 /8 (854.1) 22 (10) BLNF33L21C5A RS BLNF33L21C7A RS240 4.25 3 44 1 /8 (1120.8) 24 (11) BLNF44C22C5A RS BLNF44C22C7A RS480 4.25 3 44 1 /8 (1120.8) 24 (11) BLNF44C21C5A RS BLNF44C21C7A RS240 5.38 3 54 5 /8 (1387.5) 26 (11) BLNF54L22C5A RS BLNF54L22C7A RS480 5.38 3 54 5 /8 (1387.5) 26 (11) BLNF54L21C5A RS BLNF54L21C7A RSNote: All screw plug bundles are designed to fit the inside diameter ofthe equivalent mating coupling. They will not fit into the equivalent pipeinside diameter.3 Wired for 3-phase operation only7 CSA certified only232 WATLOW ®