Heater Catalog - Watlow

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Thermostats and AccessoriesBulb and CapillaryOrdering InformationPart NumberThermostatPartNumberEnclosure(RemoteMount Only)OptionsNote: See chart on previous page.Thermostat Part NumberS =W =D =CD =CB =LTB =PL11 =Enclosure (Remote Mount Only)General purposeMoisture resistantDust resistantOptionsCelsius dial scale (Double pole only)Chrome bezel (Double pole only)Liquid-tight brass fitting ( 3 /8 in. - 18 NPT)Pilot light, 120V only available on moisture/explosionresistant and explosion resistant enclosuresExample Part Number: 2 W LTB538 WATLOW ®
Thermostats and AccessoriesInternal 3 /8" - 18 NPTProtective WellsProtective wells isolate and protect thermostat bulbs andother temperature sensors (thermocouples, RTDs orthermistors). They allow inserting the sensing elementsufficiently into the media being heated without beingdamaged.Steel or stainless steel protective wells are availablein three lengths. They are supplied with 1 /2 inch NPTmounting and 3 /8 inch-18 NPT internal thread for matingto a liquid-tight bushing (LTB).To order, specify the appropriate part number from thetable below.Protective Wells1 /2" (12.7 mm) NPTInternal 3 /8" - 18 NPT1 /2" NPTImmersed LengthB ± 1 /4" (6 mm)Immersed LengthB ± 1 /4" (6 mm)Plug and Immersed Est. Ship.Thermowell B Dimension Part Wt.Material in. (mm) Number lb (kg)12 (305) PWS12 1 (0.5)Steel 24 (610) PWS24 2 (1.0)36 (915) PWS36 2 (1.0)Stainless 12 (305) PWSS12 1 (0.5)Steel 24 (610) PWSS24 2 (1.0)36 (915) PWSS36 2 (1.0)1/2 in. NPTInternal 3 /8 in. NPTImmersed LengthB ± 1 /4 in. (6 mm)0.500 in. O.D.WATLOW ®539
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Table of ContentsWhat type of heate
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Watlow’s Lead Time OptionsTo rema
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Heater Selection MatrixHeating Liqu
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Heater Selection MatrixHeating With
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Cartridge/Insertion HeatersMax. Ope
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Cartridge/Insertion HeatersFIREROD
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Cartridge/Insertion HeatersMin. No-
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Cartridge/Insertion HeatersExtended
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Cartridge/Insertion HeatersMetric F
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Tubular HeatersMax. Operating Typic
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Tubular HeatersWATROD Single/Double
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1" A1"Tubular HeatersWATROD Single/
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Tubular HeatersWATROD 1- 9WATROD 1-
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WATROD 1- 19Tubular HeatersWATROD S
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R 2R 2BWATROD 1- 31Tubular HeatersW
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figure 47 newTubular HeatersWATROD
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WATROD 2BTubular HeatersWATROD Sing
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Tubular HeatersThreaded Stud Termin
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Tubular HeatersExtendedCapabilityEx
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Tubular HeatersWATROD Double-Ended
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Tubular HeatersExtendedCapabilityWA
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Tubular HeatersExtendedCapabilityWA
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Tubular HeatersFIREBAR ® Single/Do
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1" 1" (25 (25 mm) mm)Min. Min. No N
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DDTubular HeatersFIREBAR Single/Dou
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Tubular HeatersFIREBAR Single/Doubl
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Tubular HeatersAFIREBAR Single/Doub
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Tubular HeatersFINBAR Single-Ended
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Flexible HeatersMax. Operating Typi
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Flexible HeatersFlexible Shapes and
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Flexible HeatersSilicone Rubber Hea
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Flexible HeatersLine HeatingModular
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Flexible HeatersLine HeatingSTRETCH
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Flexible HeatersLine HeatingSTRETCH
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Flexible HeatersPolyimide HeatersTe
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Flexible HeatersPolyimide HeatersSp
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Flexible HeatersSERIES EHGTechnical
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Flexible HeatersSERIES EHG SL10Tech
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Flexible HeatersSERIES EHG SL10Tech
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Flexible HeatersSERIES EHG CLTechni
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Flexible HeatersSERIES EHG CLTechni
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Immersion HeatersMax. Operating Typ
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Immersion HeatersWATROD and FIREBAR
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Immersion Heaters1" WATROD45⁄8 in
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Immersion Heaters¾ in. NPT Knockou
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Thermowell2.50" WATROD195½ in. Dia
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Immersion Heaters1.25" FIREBAR11WAT
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Immersion Heaters2" WATRODWATROD an
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Stand-offTerminalEnclosureConduitOp
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Direction of FlowImmersion HeatersW
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7½ in. Ref.(191 mm)75⁄8 in.(193.
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5"-150# FLANGEImmersion HeatersTher
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4"-150# FLANGEImmersion HeatersWATR
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6"-150# FIREBAR FLANGEImmersion Hea
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Immersion HeatersExtendedCapability
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Immersion HeatersOver-the-Side Heat
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Immersion HeatersOver-the-Side Heat
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Immersion HeatersFIREROD ® Immersi
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Immersion HeatersFIREROD Immersion
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Circulation HeatersMax. Operating T
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Circulation HeatersSTARFLOW Heaters
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Circulation HeatersWATROD and FIREB
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3½ in.Circulation HeatersWATROD an
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½ in.NPT DrainCirculation HeatersW
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Circulation Heaters2 1/2 NPTSCREW P
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4"-150# 4"-150#FLANGE FLANGE513⁄1
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(163.5 mm)Circulation HeatersB¾ in
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4"-150# 4"-150#FLANGE FLANGE513⁄1
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(163.5 mm)67⁄16 in. Ref.(163.5 mm
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FLANGE½ in.NPT DrainCirculation He
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Fluid Delivery HeatersMax. Operatin
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Fluid Delivery HeatersExtendedCapab
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Fluid Delivery HeatersExtended Capa
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Air HeatersDuct HeatersLDH SERIES a
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Air HeatersDuct HeatersLDH SERIESAp
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Air HeatersDuct HeatersD SERIES®®
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Air HeatersDuct HeatersD SERIES®®
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Air HeatersDuct HeatersMDH SERIESWa
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Air HeatersDuct HeatersMDH SERIESDT
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Air HeatersFinned Heaters375 Finned
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10-24 Threaded Terminals1.18 in.(30
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Air HeatersFinned Heaters375 Finned
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Air HeatersFinned HeatersFINBAR Sin
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Air HeatersEnclosure HeatersWATROD
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Air HeatersEnclosure HeatersSilicon
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Air HeatersEnclosure HeatersSilicon
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High-Temperature HeatersMax. Operat
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High-Temperature HeatersMULTICELL H
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High-Temperature HeatersExtended Ca
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High-Temperature HeatersCeramic Fib
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Specialty HeatersMax. Operating Typ
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Specialty HeatersULTRAMIC ® Advanc
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Specialty HeatersExtendedCapability
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Specialty HeatersThick Film Conduct
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Specialty HeatersExtendedCapability
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Specialty HeatersCoil/Cable Heaters
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Strip/Clamp-On HeatersMax. Operatin
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Strip/Clamp-On HeatersMineral Insul
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½ in.(13 mm) 10-24 Screw Thread¾
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Strip/Clamp-On Heaters375 High-Temp
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(30 mm)A7 ⁄8 in.(22.2 mm)3⁄8 in
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Strip/Clamp-On HeatersExtendedCapab
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Page 505 and 506: Nozzle HeatersMax. Operating Typica
Page 507 and 508: Nozzle HeatersMineral Insulated (MI
Page 509 and 510: Nozzle HeatersPre-Coiled Cable Nozz
Page 511 and 512: Radiant HeatersMax. Operating Typic
Page 513 and 514: Radiant HeatersRAYMAX ® Panel Heat
Page 515 and 516: Radiant HeatersRAYMAX Panel Heaters
Page 527 and 528: 2 15 /16 in. (74.6 mm)Radiant Heate
Page 529 and 530: Thermostats and AccessoriesThermost
Page 531 and 532: Thermostats and AccessoriesST10 and
Page 533 and 534: Thermostats and AccessoriesST10 and
Page 535 and 536: SPSTP1 L1Thermostats and Accessorie
Page 537: Thermostats and AccessoriesBulb and
Page 541 and 542: Reference DataReference DataPower C
Page 543 and 544: Reference DataPower CalculationsCal
Page 545 and 546: Reference DataPower CalculationsCon
Page 547 and 548: Reference DataPower CalculationsCon
Page 549 and 550: Reference DataEquationsOhm’s LawV
Page 551 and 552: Reference DataWattage RequirementsT
Page 553 and 554: Reference DataTubular Elements and
Page 561 and 562: Agency Certifications, Recognition
Page 569 and 570: IndexIndexProduct Category Index...
Page 571 and 572: IndexProduct Category Index375 Finn
Page 573 and 574: IndexPart Number IndexPartPageNumbe
Page 575 and 576: Terms and Conditions of SaleQuantit
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Heater Catalog - Watlow

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