Instrumart is an Authorized Distributor for Watlow

Watlow offers the most complete product line in the industry. With more than a quarter of a million designs on file, Watlow has the heater, sensor, or controller to meet your needs. read more

While some companies manufacture just heaters or just controllers, Watlow provides single source performance accountability by creating all thermal system components. From electric heaters of all types and sizes, power controllers that maximize heater performance, temperature controllers for more precise heat regulation, to sensors that provide the controllers with accurate temperature signals, you can count on Watlow to design thermal systems in which the components work together better.

Watlow's controllers are built with Control Confidence® to withstand hostile environments such as heat, electrical noise, static discharge, humidity, and vibration.

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Thermocouples / RTDs

Thermocouples / RTDs

Common, simple, reliable temperature sensors that rely on either a millivolt signal from two dissimilar metals (thermocouples) or the resistance of a highly pure conductor (RTDs), both of which correlate highly to temperature.

Temperature Controllers

Temperature Controllers

Monitors industrial processes and takes corrective action when temperatures deviate from the setpoint, greatly assisting in reducing variability, increasing efficiency, and ensuring safety.

Tubular and Process Heaters

Tubular and Process Heaters

General purpose devices used to generate heat as part of a manufacturing or industrial process. They can be installed inside of ducts to heat air or gases or put inside a tank to heat liquids or solids.

Process Controllers

Process Controllers

Instruments that monitor process variables such as temperature, pressure, flow, or level; compares them to a setpoint; and triggers corrective action when those variables fall outside the desired range.

Available Products by Watlow

Watlow WATROD Tubular Heater
Single- and double-ended tubular heating elements
Call for pricing
Watlow EZ-ZONE PM Temperature Controller
Power and functionality of a limit controller, PID controller, or integrated controller
Starting at
$164.00
In Stock
Watlow EZ-ZONE PM Express Controller
Temperature controller or other basic process application, choose between limit or PID controller
Starting at
$164.00
In Stock
Watlow FIREROD Cartridge Heater
The cartridge heater that revolutionized the heating industry
Starting at
$23.90
In Stock
Watlow DIN-A-MITE Power Controller
Innovative power controller, available in 4 models, can handle loads up to 100 amps
Starting at
$117.00
In Stock
Watlow F4S Ramping Temperature Controller
1/4 DIN single channel ramping controller
Starting at
$1,088.00
Watlow LV Series Limit Controller
Most basic and economical limit controller
Starting at
$152.00
In Stock
Watlow WATROD Duct Heater
The perfect heating solution for non-pressurized, air-heating applications
Call for pricing
Watlow Screw Plug Immersion Heater
Ideal for direct immersion heating of liquids
Call for pricing
Watlow Series CV Temperature Controller
Most basic and economical 1/8-DIN-square limit / temperature controllers
Starting at
$116.00
In Stock
Watlow F4D Ramping Temperature Controller
1/4 DIN dual channel ramping controller
Starting at
$1,274.00
Watlow EZ-ZONE RM Control Module (RMC) Multi-Function Controller
1 to 4 loops of control, multi-function high performance controller
Starting at
$168.00
In Stock
Watlow MI Band Heater
Provides the high temperatures and watt densities needed for today's demanding procedures
Call for pricing
Watlow F4P Temperature Controller
1/4 DIN high performance controller offers versatility in process / temperature applications
Starting at
$931.00
Watlow Wire Wound Element Silicone Rubber Flexible Heaters
Versatile Watlow heaters, capable of custom design and flexibility to meet almost any heating application even where space is limited
Starting at
$22.85
In Stock
Watlow Rigid Sheath Thermocouple
General application rigid sheath thermocouple
Starting at
$16.90
In Stock
Watlow FIREROD Immersion Heater
Compact, versatile immersion heater for water or water solutions 90% or above
Call for pricing
Watlow Insulated Wire Thermocouple
General application constructed with SERV-RITE insulated wire thermocouple
Starting at
$9.92
Watlow Ring Terminal Thermocouple
General application ring terminal style thermocouple
Starting at
$14.05
In Stock
Watlow Pipe Clamp Thermocouple
General application pipe clamp style thermocouple
Starting at
$18.42
Watlow Silicone Rubber Composite Heaters
Design include equal length circuits and a no-heat tab for temperature uniformity
Call for pricing
Watlow RR Style RTD
RR Style connection head RTDs
Starting at
$73.05
In Stock
Watlow Silicone Rubber Flexible Heaters
Thin and lightweight flexible heaters with the versatility to perform almost any heating function
Call for pricing
Watlow Power Series Controllers
Microprocessor-based SCR power controller
Starting at
$1,594.00
Watlow Ceramic Fiber Heater
Extremely low mass and high insulation value units with self-supported heating elements
Call for pricing
Watlow RB Style RTD
RB Style RTDs with standard industrial insulated leads
Starting at
$40.50
Watlow Flange Immersion Heater
Flanged immersion heaters for heating liquids and gases in tanks and pressure vessels
Call for pricing
Watlow EZ-ZONE ST Temperature Controller
Integrated thermal loop solid state controller
Starting at
$235.00
Watlow AR Style Mineral Insulated Thermocouple with Connection Head
Fast-responding, durable, capable, and ideal for handling higher temperatures
Starting at
$59.06
Watlow Circulation Heater
Watlow WATROD or FIREBAR heating elements combined with all necessary appliances to form a complete heating assembly
Call for pricing
Watlow Adjustable Spring Thermocouple
General application adjustable spring thermocouple
Starting at
$18.35
Watlow Rigid Sheath Thermocouple with Threaded Fitting
General application rigid sheath with threaded fitting thermocouple
Starting at
$30.30
In Stock
Watlow AR Style Mineral Insulated Dual Element Thermocouple w/ Connection Head
Fast-responding, dual element, durable, and ideal for handling higher temperatures
Starting at
$63.61
Watlow Etched Foil Element Silicone Rubber Flexible Heaters
Starting at
$23.55
Watlow RF Style RTD
RF Style metal transition RTDs
Starting at
$95.75
Watlow EZ-ZONE RM Access Module Multi-Function (RMA) Controllers
Communication protocol options, data logging and automatic configuration backup
Starting at
$146.00
Watlow Square Flange Immersion Heater
Square flange immersion heaters designed for use in boilers and industrial storage tanks
Call for pricing
Watlow Silver Series Operator Interface Terminal
Full-featured, touchscreen operator interface terminal (OIT) with Ethernet communications, serial ports and USB
Starting at
$425.00
$361.25
Watlow Adjustable Armor Thermocouple
General application adjustable armor thermocouple
Starting at
$21.39
Watlow Cable Heater
High performance, high temperature heater can be cold-formed into almost any shape
Call for pricing
Watlow Starflow Circulation Heater
Designed to heat gas streams to 1400°F for drying applications
Call for pricing
Watlow EZ-ZONE RM Limit Module (RML) Multi-Function Controllers
4 to 12 safety limits, PID control loops, over/under temperature limit control loops
Starting at
$471.00
Watlow EZ-ZONE RM High-Density Control Module (RMH) Controllers
4 to 16 loops of control, multi-function high performance controller
Starting at
$786.00
Watlow AC Style Mineral Insulated Mini Plug Thermocouple
Mineral insulated single element thermocouple with mini plug or jack termination
Starting at
$20.53
Watlow Flange Style Thermocouple
General application flange style thermocouple
Starting at
$23.10
Watlow Rigid Sheath Fixed Bayonet Thermocouple
General application rigid sheath fixed bayonet thermocouple
Starting at
$23.10
Watlow Specialty RTDs
Six styles of RTDs with standard industrial insulated leads
Starting at
$49.90
Watlow Coiled Nozzle Heater
High performance heater designed specifically for nozzle applications
Call for pricing
Watlow AF Style Mineral Insulated Thermocouple with Metal Transitions
Thermocouple with spring strain relief and metal transitions
Starting at
$25.76
In Stock
Watlow Silver Series EM Operator Interface Terminal
Touchscreen operator interface terminal (OIT) with serial and Ethernet communications, e-mail messaging, and USB host
Starting at
$385.00
Watlow Flexible Thermocouple Extensions
Watlow Flexible Thermocouple Extensions
Starting at
$6.80
Watlow EZ-ZONE RM Expansion Module (RME) Multi-Function Controllers
Additional inputs and outputs and higher amperage outputs, multi-function high performance controller
Starting at
$146.00
Watlow FIREBAR Heater
Innovative, flat surface design improves heater performance
Call for pricing
Watlow Kapton Flexible Heaters
Lightweight heaters with low outgassing and outstanding resistance to solvents, radiation, and fungus
Call for pricing
Watlow E-SAFE II Hybrid Power Switch
Provides reliable and accurate power switching up to 35 amps at 70°C (158°F)
Starting at
$41.00
Watlow Nozzle Style Thermocouple
General application nozzle style thermocouple
Starting at
$22.55
Watlow RT Style RTD
RT Style RTDs for use with thermowells
Starting at
$74.05
In Stock
Watlow EZ-ZONE RM Scanner Module (RMS) Multi-Function Controller
4 to 16 auxiliary analog inputs, multi-function high performance controller
Starting at
$346.00
In Stock
Watlow AC Style Mineral Insulated Standard Plug Thermocouple
Mineral insulated single element thermocouple with standard plug or jack termination
Starting at
$21.91
Watlow RC Style RTD
RC Style RTDs with plug or jack termination
Starting at
$62.70
Watlow QPAC Series SCR Power Controller
Modular silicon controlled rectifier (SCR) power controller with plug-in features for flexibility, available in 150 to 1000 ampere ratings
Starting at
$1,963.00
Watlow Grommet Style Thermocouple
Stainless steel grommet with extremely low profile for fast response time
Starting at
$9.75
Watlow Finbar Heater
Improves heat transfer to the air and permits putting more power in tighter spaces
Call for pricing
Watlow Large Diameter Rigid Sheath Fixed Thermocouple
General application large diameter rigid sheath thermocouple
Starting at
$18.80
In Stock
Watlow WATROD Multicoil Tubular Heater
Versatile and innovative tubular heating element with multiple coils and/or thermocouples
Call for pricing
Watlow Stainless Steel Shim Style Thermocouple
Low profile thermocouple can be placed between components for measurement of surface temperature
Starting at
$12.70
Watlow AT Style Mineral Insulated Thermocouple For Use with Thermowells
Fast-responding, durable, capable, and ideal for handling higher temperatures
Starting at
$59.05
Watlow AB Style Mineral Insulated Cut and Stripped Thermocouple
Cut and stripped mineral insulated thermocouples allow users to customize termination
Starting at
$12.06
In Stock
Watlow AS Style Mineral Insulated Wafer Head Thermocouple
Wafer head design allows quick access to terminal screws for wiring
Starting at
$29.56
Watlow Melt Bolt Thermocouple
Tip inserts directly into the plastic stream of an extruder or injection molding machine.
Starting at
$95.45
Watlow PFA Encapsulated Thermocouple
General application PFA encapsulated thermocouple
Starting at
$33.25
Watlow AB Style Mineral Insulated Cut and Stripped Dual Element Thermocouple
Dual element sensor with mineral insulation for performance allows users to terminate the thermocouple for convenience
Starting at
$15.79
Watlow AQ Style Mineral Insulated Miniature Transitions Thermocouple
Watlow AQ Style Mineral Insulated Miniature Transitions Thermocouple
Starting at
$36.16
In Stock
Watlow AT Style Mineral Insulated Dual Element Thermocouple
Fast-responding, durable, dual element, and ideal for handling higher temperatures
Starting at
$63.65
Watlow Brass Shim Style Thermocouple
General application brass shim style thermocouple
Starting at
$14.40
Watlow AF Style Mineral Insulated Dual Element Thermocouple
Thermocouple with spring strain relief and metal transitions
Starting at
$33.59
Watlow AS Style Mineral Insulated Wafer Head Dual Element Thermocouple
Wafer head design allows quick access to terminal screws for wiring
Starting at
$37.86
Watlow 375 High Temperature Strip Heaters
Capable of both high temperatures and high watt densities with uniform heat and welded post terminals for strong connections
Call for pricing
Watlow Solid State Relays
Longer heater life, fast cycle card, zero cross firing, back-to-back SCR design
Starting at
$35.00
Watlow F4T Process Controller
1/4 DIN, color touch screen panel with high resolution graphical user-interface, 1 to 4 control loops
Starting at
$625.00
Accessories
Watlow Remote User Interface
In-panel display and interface for the Watlow EZ-Zone ST Integrated Control Loop
Starting at
$116.00
In Stock
Watlow Quencharc® RC Suppressor
$6.00
In Stock
Watlow SERV-RITE Thermocouple Wire
Premium performance and reliability, Insulation temperature ranges from -328 to 2600°F (-200 to 1427°C)
Starting at
$18.00
Watlow 1⁄16 DIN basic RUI DIN-rail mount bracket
$25.00
Watlow DIN-A-MITE Fuses
Semiconductor fuses for Watlow DIN-A-MITE power controllers and SSRs
Starting at
$11.00
Watlow MC Series Miniature Thermocouple Connectors
Miniature design enables mating with other miniature size thermocouple connectors
Starting at
$4.25
In Stock
Watlow Explosion Proof Thermocouple Connection Heads
Starting at
$57.00
Watlow DIN-A-MITE Fuse Holders
DIN rail mount fuse holders for Watlow DIN-A-MITE power controllers and SSRs
Starting at
$16.00
Watlow SKP Single Panel Mount Hardware
Connectors Single Panel Mount Hardware, 425°F (218°C)
Starting at
$17.50
Watlow Standard Thermocouple Connection Heads
Starting at
$35.00
Watlow SAC-220 Cable Clamp Connectors
Cable Clamp Connectors for Male or Female
$2.50
Watlow Current Transformer (0 to 50A)
$60.00
Watlow Terminal Block for Standard Connection Heads
Starting at
$7.00
Watlow SC Series Standard Connector
SC Standard Connectors are ASTM color coded and made of Compensated alloys
Starting at
$5.25
Watlow AC/DC Power Supply Converter 90-264VAC to 24VDC
$240.00
Watlow EtherNet/IP™ cable adapter
$25.00
Watlow 0219-0374-0000 Communication Cable
Communication cable for 7 and 10 inch versions Silver Series Operator Interface Terminals
$67.00
Watlow SK Series Quick-Attach Thermocouple Connectors
Starting at
$6.25
Watlow PT Polypropylene Head and Connector Blocks
Starting at
$35.00
Watlow 08-5362 Manual Control Kit
Manual control kit for the QPAC series
$81.00
Watlow Silver Series Power Supply
Power supply for Watlow Silver Series Operator Interface Terminals
Starting at
$65.00
Watlow AC/DC Power Supply Converter 90-264VAC to 24VDC
$200.00
Watlow High Temperature Connectors
Starting at
$23.00
Watlow QPAC Current Transformer
150A, 200A, 300A, 400A, 500A, 600A, 800A and 1000A options
Starting at
$80.00
Walow 0836-0763-0000 DIN-rail end stop
$5.00
Watlow 50500701 / 50500801 Terminal Blocks for PT Heads
Single or dual elements for the PT Series polypropylene head
Starting at
$9.00
Watlow Three-Pole Connectors
Three-Pole Connectors for RTD Applications, 400ºF (200°C)
Starting at
$11.00
Watlow 16-0176 Interstage Transformer
5A, 20mA interstage transformer
$80.00
Watlow Screen Covers
Protective screen covers for the Watlow Silver Series Operator Interface Terminal
Starting at
$46.00
In Stock
Watlow SAB Series Crimp / Braze Connectors
Starting at
$2.00
Watlow Rubber Plugs for slots A, B, and E
$5.00
Watlow Rubber Plug for Slot D
$5.00
Watlow 0219-0382-0000 USB Cable
5-foot USB cable for downloading projects from a PC to the Watlow Silver Series operator interface terminal
$16.00
Watlow Flash Card to USB Port Adapter
$25.00
Watlow SD Industrial Memory Card 2G Memory
$35.00
Watlow F4T Mixed I/O Flex Modules
for use with the Watlow F4T 1/4 DIN Process Controller, 2 outputs available
Starting at
$50.00
Watlow Modular Back Plain Connector
$60.00
Watlow 0219-0388-0000 Communication Cable
Communication cable for 4.3 inch screen versions of Silver Series Operator Interface Terminals
$67.00
Watlow High Density F4T Flex Modules
for use with the Watlow F4T 1/4 DIN Process Controller
Starting at
$75.00
Watlow F4T Communication Flex Module
Modbus® RTU 232/485 communications, for use with the Watlow F4T 1/4 DIN Process Controller
Starting at
$75.00
Watlow F4T Limit Flex Module
For use with F4 1/4 DIN Process Controller, limit control with universal, thermistor and temperature inputs
Starting at
$90.00
Watlow AC/DC Power Supply Converter 90-264VAC to 24VDC
$300.00
Watlow SpecView HMI Software
Communicates with any EZ-ZONE controllers, flexible data logging and report generator
Starting at
$995.00