Heater Catalog (Section) - Immersion Heaters - Watlow

Immersion HeatersWATROD and FIREBAR Screw PlugImmersion Heaters®®Application: Process Water• 2 1 /2 inch NPT screw plug• FIREBAR elements• With thermostat (DPST)2.50" FIREBARNote: Higher amperage products requirea pilot duty thermostat with separatepower controller. Please see followingpages for available heaters withoutthermostats.• General purpose or moisture/explosionresistantenclosure23General Purpose5½ in. Dia.(140 mm)Moisture/Explosion-Resistant71⁄16 in. Dia.(179.4 mm)¾ in. NPT Knockout(3) 1 in. (25 mm) FIREBAR ElementsThermowell1½ in. NPT Hubs33⁄8 in. (85.7 mm) Cold (Ref.)"B"2½ in.(64 mm)Bundle(3) 1 in. (25 mm) FIREBAR ElementsThermowell2.50" FIREBAR2475⁄8 in. Dia.(193.7 mm)2½ in.(64 mm)Bundle85⁄8 in. Dia.(219.1 mm)33⁄8 in. (85.7 mm) Cold (Ref.)"B"Type 5A (60 to 250°F)Type 7A (100 to 550°F)“B” Dim. Ship Wt.PartPartDescription Volts kW Ph in. (mm) lbs (kg) NumberDel.NumberDel.General Purpose Enclosure45 W/in 2 8 240 6.0 3 12 (305) 12 (6) BLNF12A27S5A RS BLNF12A27S7A RS304 SS Plug 240 7.5 3 14 1 /2 (368) 12 (6) BLNF14J27S5A RS BLNF14J27S7A RS3-Alloy 800Elements 240 9.0 3 17 (432) 13 (6) BLNF17A27S5A RS BLNF17A27S7A RS(7 W/cm 2 ) 240 12.0 3 21 1 /2 (546) 15 (7) BLNF21J27S5A RS BLNF21J27S7A RS45 W/in 2 8304 SS Plug3-Alloy 800Elements(7 W/cm 2 )RAPID SHIP• RS - Next day shipmentup to 5 piecesMoisture/Explosion-Resistant Enclosure 7240 6.0 3 12 (305) 14 (7) BLNF12A27C5A RS BLNF12A27C7A RS240 7.5 3 14 1 /2 (368) 15 (7) BLNF14J27C5A RS BLNF14J27C7A RS240 9.0 3 17 (432) 16 (8) BLNF17A27C5A RS BLNF17A27C7A RS240 12.0 3 21 1 /2 (546) 18 (9) BLNF21J27C5A RS BLNF21J27C7A 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.7 CSA certified only8 Can be wired for 1-phase operation196 WATLOW ®