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Temperature Sensors - United Electric Controls (UE)

Temperature Sensors are manufactured by United Electric Controls (UE) in our facility in Watertown, Massachusetts.  We are a major manufacturer of industrial temperature sensors, thermocouples, resistance temperature sensors (RTD's), thermistor and other types of  sensor assemblies. ISO 9001 certified and a leading practitioner of Lean Manufacturing methods, we focus on building high-quality, high-reliability temperature sensor products for the industrial market. Our expertise covers a wide variety of applications, from lab equipment to road-making equipment, from the blast furnace to the blast chiller, and everything in between.


We Design, Engineer and Manufacture:







All of our products are known for their consistent high reliability, cost effectiveness and durability. We are continually examining and improving our engineering, production and service operations to meet constantly changing customer requirements. Our ISO 9001 certification is objective proof of our company wide commitment to quality.


We have a talented group of Temperature Sensor experts at our Headquarters in Watertown, MA. This group, Applied Sensor Technologies, was formed specifically to serve our wide spectrum of customers. They are experienced and dedicated to producing the best temperature sensors for a wide variety of applications.  Please email or call us with any questions or, visit our Temperature Sensor Website.


Our customers purchase both custom designed and standard catalog products.  We excel in supplying today's manufacturers with temperature sensors that meet their needs. We can help you develop, and then manufacture the sensor that works with your product. United Electric brings many strengths to the OEM customer, including:


  • Sales personnel located around the world so they can be available to serve customers whenever and wherever they need assistance.
  • Engineering Expertise to work with your engineers to develop the right design.
  • Highly efficient manufacturing processes are designed to build your sensor economically and reliably.
  • Quick Response to Orders - UE can deliver your parts when you need them.


We manufacture temperature sensors for many different types of customers' applications. Some of our customers use our Temperature Sensors in:








  • Medical equipment - Sterilizing, biological storage
  • Jet fighters, helicopters
  • Energy - Turbines, generators and fuel cells
  • Scientific instruments - Storage and measurement
  • Food Equipment - Cooking, Storing and Cleanup

Sensor Styles

The Sensor Box

Standard Catalog Products

Sensor Sheath Materials

Contact Us

Temperature Sensor Styles


Temperature Sensors at UE are built in a broad spectrum of styles. They are:

Temperature Sensor Leadwire Thermocouple

Leadwire - Standard thermocouples with fiberglass, Teflon® or PVC insulation available with a variety of protective coverings including Teflon® sleeves.

Terminal Heads

Terminal Heads -Configurations including Enclosure Type 4 and 7 heads; with or without NUN (nipple-union-nipple) connections.

Process Mount Temperature Sensor

Process Mount - Double and single sided process mount styles and single sided instrument mounts.

Plug Without Leadwire

Plugs - Standard and mini male plugs with and without leadwires.

Surface Mount Temperature Sensors

Surface Mount - A variety of mounting options including washer styles, mounting lugs and weld pads; with fiberglass or Teflon® insulation.

The Sensor Box

The Sensor Box™ provides the Process customer with an alternative to expediting, emergency orders and large amounts of “dead” inventory. A modular system of sensors, hardware and tools, the Sensor Box™ is used by the maintenance professional to build a variety of temperature sensor assemblies on-site, in minutes. Among the benefits that customers report are:


  Improved Process Up-time

  Greatly Reduces Expediting, Emergency Orders and Premium Charges

  Fewer Emergency Orders

  Lower, More Flexible Inventory


The Sensor Box™ can be customized in many ways to meet your specific needs.


You Have A Problem... 3:00 PM on a Friday afternoon, and you’ve just discovered a temperaturesensor has failed in an important process. The Safety Engineer wantsthe process shut down, but you’re under pressure to keep productionmoving. You’re going to spend the rest of the afternoon in “Panic Mode,”calling every sensor supplier you can  think of, begging for the bestdelivery at a premium. Not very pretty. If this sounds familiar, then the SENSOR BOX™ was developed tohelp improve your life. Maintenance or instrument technicians cannow build a new temperature sensor assembly, install it and theplant can be back up and running in minutes rather than days!The SENSOR BOX™ is designed for any plant where temperaturesensors are an important part of the operation, and downtime is notan option.  


Standard Catalog Products

United Electric Controls has a broad selection of Standard Catalog Temperature Sensors that are designed for general industrial use. These are available for a variety of uses and come in many standard configurations. These standard products are available from our worldwide network of distributors or directly from our factory in Watertown, MA.


United Electric Controls has General Purpose and Mineral Insulated thermocouples, wire wound and thin film RTDs as well as thermistors for all standard applications. In our catalog we offer a wide variety of styles of temperature sensors using these different sensing elements.

Temperature Sensor Sheath Materials

Sheath Material              Description                                 Applications                  Temperature Range

304 Stainless steel

UE Non Standard Material

316 Stainless steel

316 (L) UE Standard Material


Inconel ® 600 UE Non Standard Material

A very good all purpose stainless steel of moderate cost.

The best corrosion resistance of the Stainless steels. Good resistance to sulfur or chlorine bearing liquids.

This alloy is more expensive than SS but has higher corrosion resistance and better temperature tolerance.

  •  Food & Beverage
  •  Chemical Processing
  •  Dairy
  •  Hospital Equipment
  •  Pharmaceutical
  •  Nuclear Equipment
  •  Mild Corrosives
  •  Marine
  •  Chemical Processing
  •  Food
  •  Petroleum Refining
  •  Pharmaceutical
  •  Pulp and Paper
  •  Textile Finishing
  • Furnace
  • Chemical Processing
  • Food Processing
  • Nuclear Power Equipment
  • Caustic Chemicals

Up to 875 degrees C (1,600 degrees F) for cyclical applications

Up to 900 degrees C (1650 degrees F)

Up to 1,175 degrees C (2,150 degrees F)

Contact Us


Applied Sensor Technologies, a division of United Electric Controls, is a major manufacturer of thermocouple, RTD, thermistor and other temperature sensor assemblies. ISO 9001:2000 certified and a leading practitioner of JIT and Lean Manufacturing methods, Applied Sensor Technologies has expertise in a wide variety of process applications, from the blast furnace to the blast freezer; from chemical processing to food processing. Please visit our website: www.appliedsensortech.com, or give us a call at 617-923-6966!




Thermocouples can measure temperatures over wide ranges, inexpensively.

They are very rugged, but they are not as accurate as RTDs and thermistors.


A thermocouple is basically two strips of wires of dissimilar metals. These metal

wires are joined at one end and the voltage is measured at the other end. Changes

in the temperature at the juncture induce a change in electromotive force (emf) at

the other end. As the temperature goes up, this output emf of the thermocouple rises,

though not necessarily linearly.


Visit our Thermocouple page to learn more.



Below is a summary of some of the advantages and disadvantages of thermocouples


 Advantages        Disadvantages


Self Powered                   Non Linear

Simple                              Low Voltage

Rugged                            Reference Required

Inexpensive                     Least Stable

Wide Variety                     Least Sensitive

                                           Wide Temperature Range


RTD's or Resistance Temperature Detectors


RTD's are stable and have a fairly wide temperature range, but are not as

rugged and inexpensive as thermocouples. Since they require the use of

electric current to make measurements, RTD's are subject to inaccuracies

from self-heating.


An RTD capitalizes on the fact that the electrical resistance of a material

changes as its temperature changes. RTD's rely on the resistance change

in a metal. The resistance will rise more or less linearly with temperature.


Traditionally, RTD's use a length of conductor (platinum, nickel iron or

copper) wound around an insulator. Newer styles use a thin film of the

conductor deposited on a ceramic substrate.


RTD's are used to measure temperatures from -196° to 482° C (-320° to 900° F).


Visit our RTD page to learn more.


 Advantages                              Disadvantages


Most Stable                                             Expensive

Most Accurate                                         Current Source Required

More Linear than Thermocouple        Small delta R

                                                                  Low Absolute resistance

                                                                  Less Rugged than Thermocouples


Below is a summary of some of the advantages and disadvantages of RTD's



Thermistors tend to be more accurate than RTD's and thermocouples, but

they have a much more limited temperature range because of their marked



A Thermistor capitalizes on the fact that the electrical resistance of a material

changes as its temperature changes. Thermistors rely on the resistance change in a ceramic semiconductor, with the resistance dropping non-linearly with a temperature rise.


Thermistors can be a low cost solution to temperature measurement. They

tend to have large signal outputs and their small size permits fast response

to temperature changes. UE Thermistors are used to measure temperatures

from -45° to 260° C (-50° to 500° F).


Below is a summary of some of the advantages and disadvantages of Thermistors


 Advantages                              Disadvantages


High Output                                                 Non Linear

Fast                                                               Limited Temperature Range

Two-wire ohms measurement                Fragile

                                                                       Current Source Required



IC Sensors


The newest type of temperature sensor on the market is the integrated

circuit (IC) temperature transducer. IC sensors can be designed to produce

either voltage or current output and are extremely linear.


IC sensors are a very effective way to produce an analog voltage proportional

to temperature. They have a limited temperature range and are used to measure temperatures from -45° to 150° C (-50° to 300° F).


Below is a summary of some of the advantages and disadvantages of IC Sensors.




Most Linear

Highest Output





Temperatures limited to 150 degrees C

Power Supply Required


Limited Configurations



Temperature Sensor Accessories


We offer accessories to accompany our temperature sensors.


• Thermocouple Wire

• RTD Wire

• Temperature Sensor Heads and terminal blocks

Head mounted transmitters

• Extension lead wire assemblies

• Plugs and other terminations

• Compression fittings

Thermowells and Protection Tubes


Visit our Accessories page for more information.

When you choose a Heat Trace RTD you simplify installation and reduce maintenance expenses. They are designed for use in any pipe or surface temperature measuring applications; these sensors have been specifically designed for use with electronic heat control products.


Heat Trace products have:


• Heat Transfer pad with excellent temperature response

• Rugged stainless steel sheath provides excellent mechanical protection

• Replaceable element design simplifies RTD replacement.

• To replace a faulty element, you simply remove the head cover, disconnect the leads and remove the element. You then insert the new

   element and reconnect the leads. Your process is up and running in minutes.



Heat Trace Thermocouple
The Sensosr Box™

Heat Trace Thermocouple

The Sensor Box

Tel:  (617) 926-1000

Fax: (617) 926-4354

Do you have a  customer service or technical question?  Please email us and we will get back to you.

180 Dexter Avenue, Watertown, MA  02472-4200