Online Thermowell Calculation Tool

Emerson’s Online Calculation Tool Helps Users Select Thermowells in compliance with the 2010 ASME Standard

Emerson Video about PTC 19.3 TW Emerson Video about PTC 19.3 TW

MINNEAPOLIS MN, USA — Emerson Process Management has introduced an online thermowell calculation tool that incorporates therecent ASME PTC 19.3 TW standard.

“The new tool offers preliminary calculations and gives users the option to perform a quick pass or fail thermowell calculation,” said Danjin Zulic, temperature marketing engineer, Emerson Process Management. “Users can save time by performing iterative, preliminary calculations to select the right thermowell earlier in the design process.”

The tool is now available free-of-charge at Emerson is the first to make available an online tool offering a more automated approach to thermowell calculation as opposed to the traditional way of utilizing spreadsheets.

In addition to the tool, the web site has a link to an R21 Report request form for official evaluations.

“Once the thermowell order is ready to be placed, the official R21 report provides detailed documentation of the thermowell calculation,” Zulic said.

A video and white paper are also available on the web site that explain the new ASME PTC 19.3 TW standard.

Enhancements in the new standards and thermowell calculation tool include different types of stem profiles, more accurate natural frequency equations, and a calculated Strouhal number. The new standard also provides natural frequency correction factors that take into account different components of the thermowell such as the mounting style and temperature sensor mass.

To try Emerson’s thermowell calculation tool, learn about the ASME PTC 19.3 TW standard and read the white paper visit

About Emerson Process Management

Emerson Process Management (, an Emerson business, is a leader in helping businesses automate their production, processing and distribution in the chemical, oil and gas, refining, pulp and paper, power, water and wastewater treatment, mining and metals, food and beverage, life sciences and other industries. The company combines superior products and technology with industry-specific engineering, consulting, project management and maintenance services. Its brands include PlantWeb™, Syncade™, DeltaV™, Fisher®, Micro Motion®, Rosemount®, Daniel™, Ovation™, and AMS Suite.

About Emerson

Emerson (NYSE: EMR), based in St. Louis, Missouri (USA), is a global leader in bringing technology and engineering together to provide innovative solutions for customers in industrial, commercial, and consumer markets around the world. The company is comprised of five business segments: Process Management, Industrial Automation, Network Power, Climate Technologies, and Commercial & Residential Solutions. Sales in fiscal 2011 were $24.2 billion.

Rüeger Temperature Sensors

Sensors & gauges for temperature & pressure

Capteurs & instruments pour la mesure de températures et de pression

Sensors und Messgeräten für Temperatur und Druck

RÜEGER S.A. was founded in 1942 and offers to a select clientele the most complete range of temperature and pressure measuring instruments in the world.

Over 65 years of history have provided a huge experience that now constitutes the basis of a strategy of high specialisation. The Company today has 170 employees providing top products and quality services on all five continents around the world.

Head Office and subsidiaries

RÜEGER S.A. has its Head Office in Crissier (Lausanne) and a sales office in Stuttgart (Germany). The rapid growth of the emerging markets of
S.E. Asia encouraged the Company to open a sales office in Kuala Lumpur (Malaysia) and a subsidiary in Peking (China).

Measuring the temperature …  Measuring temperature is an extensive subject. RÜEGER S.A. is the greatest specialist for industrial applications.

Local temperature reading
The temperature is indicated at the place where it is measured.
The operation of such an instrument requires no external energy supply.
This is the bimetallic or gas-pressure thermometer (Filled System Thermometer).

Remote temperature reading
In this case, the information is sent to and indicated at a place other than that in which the measuring device is located.
In this case, thermoelectric sensors (thermocouples) requiring a 24V power supply are used.

RUEGER SA Switzerland
RUEGER GmbH Germany
RUEGER Sdn Bhd Malaysia
BEIJING RUEGER Precision Instruments China

JMS SwiftyCalc for Thermowells

Design thermowells that last and extend the life of your temperature sensors

JMS SwiftyCalcImage Courtesy: JMS Southeast}>JMS Southeast has developed a program based on the standard that allows you to perform the calculations necessary to determine the suitability of your design for your process conditions with few complications.

Just about any type of well can be configured. It is available free to their customers and friends.

The JMS SwiftyCalc quickly provides users with a thermowell design based upon your material requirements and process variables that you can count on to meet the updated ASME PTC 19.3-TW (2010) standard

Paste this on a web browser to access the site of just click the link—> and learn what this special calculator named “SwiftyCalc” can do.

NEW ASME Thermowell Standard Plus

A Free Thermowell Calculator From JMS Southeast Based on the Standard

This month the ASME 19.3 Committee released the new standard on thermowells, PTC 19.3 TW – 2010 Thermowells.

It is available on their website at

As a member of that committee, I struggled to get them to produce the standard as an electronic spreadsheet but because of technical issues, ASME declined to do so.

JMS Southeast has developed a program based on the standard that allows you to perform the calculations necessary to determine the suitability of your design for your process conditions with few complications.

Just about any type of well can be configured. It is available free to our customers and friends.

Paste this on your browser to access the site: and learn what this special calculator named “SwiftyCalc” can do for you.

ED Note: 1. The description of the new standard on the ASME website reads as follows:

The object of this Standard is to establish a mechanical design standard for reliable service of tapered, straight, and stepped-shank thermowells in a broad range of applications. This includes an evaluation of the forces due to external pressure, and the combination of static and dynamic forces resulting from fluid impingement. This Standard applies to thermowells machined from barstock, and includes those welded to or threaded into a flange and as well as those welded into a process vessel or pipe with or without a weld adaptor. Thermowells manufactured from pipe are outside the scope of the Standard. Thermowells with specially designed surface structures (e.g., a knurled surface or a surface with spiral ridges) are beyond the scope of this Standard, due to the difficulty of providing design rules with broad applicability for these types of thermowells.  Thermowell attachment methods, standard dimensions, parasitic vibration of a sensor mounted inside the thermowell, and thermal equilibrium of the sensor relative to the process stream are beyond the scope of this Standard. Additionally thermowells fabricated by welding, including flame spray or weld-overlays, at any place along the length of the shank or at the tip are outside the scope of the Standard.

ED Note: 2. The Table of Contents for PTC 3 TW – 2010 may be downloaded in PDF Format here:

Thermowell Vendors

Nearly every maker of probe- type temperature sensors offers some sort of thermowell.

Some companies specialize more than others and there are even organizations that supply only thermowells and related components.The list of vendors below is not exhaustive.

If your company belongs there, click on ADD LINK and let us know.

Basic listings for vendors are not free, but reasonably-priced free and, if you notice, we strive to find those technically-aware suppliers that provide free technical information and advice on their web sites. They get special notices and links as you will find when you traverse this site’s pages.

Illustrations of thermowells are courtesy of RÜEGER S.A. of Switzerland, one of the world’s largest makers of high quality bimetallic, gas pressure and thermoelectric temperature sensors (and thermowells).

Featured Vendor

Tempsens Instruments specializes in the design and manufacturing of metal protection wells for the primary and basic styles . The facilities include CNC, deep drilling and conventional machine etc.

RTD Vendors

RTDs (Resistance Temperature Detectors)  are wire wound and thin film devices that depend on the temperature coefficient of electrical resistance of metals. As the temperature increases, the positive temperature coefficient of the metal produces an increasing resistance value.

You can read more about them and how they work on the companion RTD pages.

Some metals have a nearly ideal, linear coefficient, like platinum . While other materials have more non-linear coefficients, such a copper and nickel.

This page provides links to some of the vendors of these devices.

You may note some redundancy with links on related pages. A good part of that is due to the fact that some vendors supply more than one type of sensor, plus many provide technical, applications and related support to customers and prospective ones.

Reading vendors literature can be a great, but unstructured way, to gain some technical knowledge. The only danger is that it is hard to learn more than the vendor puts in their literature or what their salesperson knows.

That approach can be quite variable but certainly does not make it easy for you to evaluate products without benchmarks.

Some advice (non-definitive): check with more than one vendor and get some education about these sensors from other sources, too.

There are books and courses available. Check your local library’s technical section or a engineering or science library at a university or technical college or school or the ISA or someone on the ASTM E20 Committee on Temperature Measurement.

ASTM E20 has a special subcommittee devoted to just RTDs. You can find more about their RTD standards on the RTD Standards Page of this site.

Thanks for visiting.

General Resources for Vendors

Some RTD Vendor Web Sites:

  1. Advanced Sensing Products (USA)
    A secondary standard PRT and precision RTD probe manufacturer. They make own RTD elements to completely control product quality. Provide NIST traceable calibration services with temperature ranging from -189 to 850°C. Customers are in metrology, instrumentation, power industry, turbine manufacturers and the military.
  2. ARi Industries(UK) Ltd home page
  3. Biodata: New Products (UK)
  4. Burns Engineering, Inc. (USA) designs and manufactures temperature products, for all industries and processes, with standard, custom, and Hazardous Location approved models. ISO-9001 Registered. ISO-17025 Accredited.(RTDs, Thermocouples, Engineered Sensors, Transmitters, Thermowells and Accredited Calibration Service)
  5. Conax Buffalo Technologies(USA)
    A leading manufacturer of temperature sensors including thermocouples and RTDs In Buffalo (where else?) New York.
  6. Ephy-Mess GmbH (Germany)
    Sensorik für thermischen Motorschutz, für die Verkehrstechnik, für den Anlagenbau und für Laboranwendungen: Pt-100, Pt-500, Pt-100, Wickelkopffühler auf Pt-100, Ni- und Cu- Basis.
  7. HL-Planar Technik(USA)
    US Office in Scottsdale Arizona–A leading supplier of Nickel and Copper RTDs
  8. JMS Southeast, Inc.
    In Statesville, North Carolina, USA
  9. Jumo Process Control RTD Sensors and a lot more-home page
  10. La Termotecnica (Italy)(Italiana and English)LA TERMOTECNICA e’ una societa’ Italiana, fondata nel 1976 e’ una tra le prime aziende italiane a produrre e progettare con tecnologia propria sonde a termocoppia e termoresistenza.
    LA TERMOTECNICA, an Italian company set up in 1976, is one of the leading companies in Italy in the production and design of temperature sensors based on proprietary thermocouple and RTD technology.
  11. M & Ma Sensorstech (USA & CHINA)
    A cooperative venture with Anhui Tiankang Co. Ltd. a measuring instrument design and manufacturing company. Their primary product lines are Resistance Temperature Detectors, thermocouples, temperature transmitters, compensating cable and complete sensor assemblies. They specialize in OEM and private labeled equipment due to their low cost, ISO-9000 approved manufacturing capabilities.
  12. Precon, Inc. (USA)
    RTDs, NTC Thermistors and Humidity Sensors available in standards or custom probes. Precon also designs and builds controllers and can provide turnkey sensing and control solutions
  13. Pyro Electric Inc. (USA & INDIA)A ‘Design to Engineer’ manufacturer of Thermocouples, RTDs and their assemblies, plus Temperature and Pressure gages. They have a track record as suppliers to Oil Refineries, Petrochemical Plants and other process industries. They are ISO 9001:2000 certified along with ATEX 94/9/EC approved. Customers include Exxon Mobil, Petronas, Reliance, GAIL, L & T Ltd, and Samsung.
  14. RDF Corp.(USA)
    RDF in New Hampshire; well known for their unique flexible film sensors, too.
  15. The RTD & SPRT supplier listings on (USA)
    The Free & Self Service Directories of Temperature & Moisture Sensor Resources
  16. RTD Company, (USA)
    Cambridge, Minnesota
  17. SDI (USA)
    Sensing Devices Inc., in Lancaster PA
  18. Smith Systems Inc (USA)
    Brevard, North Carolina, Standard and Custom Sensors for Speed, Motion and Temperature – Cabling and Controls
  19. STOLAB (USA)
    Accurate Industrial Thermometers
  20. Temp-pro inc.(USA)
    From Northampton, Massachusetts, where custom is part of Customer.
  21. Tempsens Instruments India
    An ISO 9001/2000 certified manufacturer of all types of RTDs, Thermocouples,Thermowells, Calibration Baths and associated accessories such as Connection Heads, Compensating Cable and Ceramic Tubes. They offer High Accuracy RTDs for general and special purposes. They are available in Class A, B, ½ , 1/3 , 1/5 DIN, 1/10 DIN with various sheath material such as SS304, 316, 310, Hastalloy,  Monel etc.
  22. THERMOCOUPLES & RTD’s (Zambia)
    Yes, Zambia in Africa
  23. Thermo-Electra b.v.(Netherlands)
    “Your partner in temperature sensors”-Industrial thermocouples RTDs and Thermowells
  24. Thermo-Kinetics (Canada)
    Manufacturing help from knowledgeable folks headquartered in Mississauga ONT with regional offices throughout the Provinces. where service is foremost!
  25. Weed Instruments(USA)
    Corporate Home Page From Texas
  26. Xian Diamond (China)
    Supply RTDs and assemblies mostly to OEMs.