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Thermo Electric




In this astonishing picture it seems like part of the wires are molten, but in fact it is what grains look like after major slipping. Platinum appears to have a high adherence to aluminium-oxide, so sometimes the friction between these materials calls for major engineering experience, skills and clever constructions.

A limited number of molecules affect platinum. One of them is silicon, and even as silicon-carbide or other silicides, physical contact between the two should be avoided. Molecules such as phosphorous and sulphur aren’t really Kryptonite-like, but need to be taken into account. Hydrogen, by means of hydrogen induced cracking (or SOHIC, its stress oriented version), can be detrimental. In case of any performer chemical analysis, for example with the SEM-analysis we supply, you may notice a presence of potassium or calcium. Some of these however may be residues from the cleaning agent or the use of wrong glove-material during handling of the noble metal.

Most of the sensors we manufacture with noble metal thermocouples have a ceramic protection sleeve, often fused silica, silicon-nitride or silicon-carbide. Sometimes however customers need a mineral insulated type thermocouple with a metal alloy sheath. In this case care needs to be taken not to expose the instrument to higher temperatures, or allow for some additional uncertainty in the measurement over time, as some of the components of the alloy tend to migrate through the isolating ceramic towards the thermocouple conductors.

The application of type B thermocouple pairs has shown increased interest: the price of the costly component rhodium has dropped, while the more recent transmitters can cope with the lower output at lower temperatures, providing us with an extended range and other mechanical bonuses.

Please do not hesitate to contact us via for more information, to study this topic more in detail or when you request a proposal from Thermo Electric Instrumentation, based on our experience in:

  • solar industry (e.g. furnaces for the production of the cells themselves);
  • semiconductor industry;
  • other CVD and epitaxy (EPI) applications;
  • desulphurisation furnaces;
  • liquid metal applications;
  • calibration / reference standards;
  • thermowells for extreme/hot acids or erosive wear solutions.


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With noble metal thermocouples, we usually mean type R, S or B. These are thermocouples made of two dissimilar alloys of platinum and rhodium. The use of platinum has a number of technical advantages, but also a number of properties we need to take into account when designing instruments based on the use of sensors made out of these alloys.

Apart from its appealing looks, platinum is a fascinating substance, being on one hand the hardest metal and at the same time very ductile. This means it has a soft feel to it, until you try to cut it. For thermocouple applications, and incidentally as thermowell, it has an outstanding, sometimes unsurpassed, resistance to high temperature oxidation and acids. The measurement itself is very accurate when compared to the more common types such as type K or N.

At first glance the initial price of an instrument based on platinum wire seems high. In many cases however there is a possibility to do a trade-in, e.g. with our noble metal return program. The value of the returned platinum is so high that the real cost of ownership turns out to be lower than that of other alloys. We don’t re-weld old wire; the platinum and rhodium are returned to their state as molecules participating in the raw material for the production of new alloys or maybe jewelry.

When designing an instrument based on platinum, even though the material has appealing high-end properties, special care is essential. For example, repeated stress or strain needs to be avoided. Especially repeated compressive strain may lead to grain boundary slip, resulting into what is often described as bamboo-effect.

The combination of Thermo Electric’s years of engineering experience and dedicated research results in the foundation for the various long standing partnerships. For more information or inquiries on noble metal temperature sensors or “bamboo-effect”, please contact

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Thermo Electric Instrumentation invites its customers, prospects and business relations to participate in one of the TE masterclasses Temperature Measurement, related to Thermocouple and RTD temperature measurement including related topics such as calibration, protection and testing. The TE masterclass Temperature Measurement touches all the aspects of temperature measurement and its applications, but specifically goes into depth with:

  • Sensor types and basic understanding of temperature measurement;
  • Calibration (what, how, why, when and ISO17025);
  • Thermocouple grains, grain boundary effects, aging and hysteresis;
  • Calendar – Van Dusen;
  • Erosive and abrasive wear;
  • Conductivity in magnesium oxide;
  • Testing a temperature instrument other than calibration;
  • Temperature measurement and pressure;
  • Boiler and furnace temperature measurement;
  • Surface temperature measurement;
  • Wake frequency calculations (WFC acc. PTC 19.3);
  • Hydrogen and temperature measurement;
  • Alloys, ceramics and coatings frequently used in (or on) thermowells and sensors;
  • Multilevel / multipoint measurement.Our facilities in Waddinxveen are well equipped to receive customers and often provide the opportunity to include a factory tour. Thermo Electric Instrumentation also provides in house training sessions or off site sessions based on the number of students or demands.

For more information, orientation or planning an introduction meeting, feel free to contact us via communication and the ability to listen to our customers are to be cornerstone of this platform. Thermo Electric Instrumentation understands clearly that the input of our customers is of major importance to this way of communication:

  • Providing tailor made content;
  • Use situations, examples and knowledge that are appropriate or adapted to the related industry;
  • Share the knowledge, experience and questions of a larger group and learn from experience.

Apart from (or in addition to) these masterclasses Thermo Electric Instrumentation also provides the opportunity for training towards a better understanding of the more basic or general subjects and topics related to temperature measurement.


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The Thermo Electric Instrumentation laboratory is much more than yet another calibration facility…

The Thermo Electric Instrumentation laboratory is much more than yet another calibration facility. The entire staff is continuously striving to maximize its usefulness and support. For some customers this means a down time saver, because they can enter the instrument data and skip time consuming adjustment procedures. For others it’s a one-time shopping because it is possible to combine temperature, electrical and time based measurements.

For various reasons, such as:

– price; dsc_7470klf

– lead time;

– accuracy;

– problem solving;

– customer specific methods;

– qualification procedures;

– clean room suitable calibration with corresponding packaging;

Thermo Electric offers an in-house portfolio that comprises:

– ISO-17025 (ILAC, COFRAC,  etc.) calibration;

– Thermo Electric Instrumentation calibration;

– production line calibration;

– batch calibration;

– programming (which isn’t really calibration) including Callendar van Dusen;

– adjustment (not really calibration either).

It is imperative to clearly understand the customers’ definition and description of calibration. For example, batch calibrations sometimes are defined as merely the data of the MI-cable without any real measurements, sometimes customers desire specific parts of a batch to be calibrated as an instrument, and sometimes according to the ISO17025 procedures.

The desired accuracy and the related uncertainty often merit a week long training to reveal the magic of statistics.

Other information our experienced sales department needs to carefully distill out of specifications or inquire from customers, relate to things like insertion depth and the actual range the desired accuracy relates to. At first glance insertion depth may seem to be irrelevant, however, heating a type K thermocouple for annealing or calibration purposes causes a change. The part that sticks out of the equipment during calibration remains rather unchanged. Still, combined in one instrument, these two hold the promise of an inhomogeneity, causing errors when a temperature difference over that location occurs.

In order to achieve the impressive measurement capabilities as listed on , and still be able to perform within an interesting price range and time frame,  Thermo Electric offers :

  • the people;
  • the environment;
  • the equipment.

The people: a senior calibration engineer with industry wide renowned knowledge, calibration engineers, experienced sales engineers and inspired management.

The environment: a “clean-room” laboratory, where temperature, humidity and stress levels are well managed.

The equipment:
– high end tube furnaces to reach 1500 °C within ISO17025;
– liquid salt bath to be able to offer a CMC of 0,092 °C at 600 °C;
– motion guide system to position multi level sensors as part of a fully automated cost saving system;
– liquid baths, triple point cells, other primary and work-standards;
– programming / communication equipment for HART®, bus systems and major transmitter

Apart from our own quality system and the ISO-17025 accreditation, our facility is very active in participation in inter laboratory comparisons worldwide. These comparisons show our customers, auditors and us that our measurements hold a high level of reliability.
For more information or inquiries, please contact


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Thermo Electric in accordance with New ATEX Directives

The latest ATEX directives have been updated as per April 20th, after careful review by our team of technical experts, we proudly confirm that Thermo Electric is in full compliance with the”essential safety requirements” and related ATEX standards. Our ATEX certificates remained unchanged,
here for downloading.  

atex logo

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Renewal Marine & Offshore approvals


The TEI type-approval for :logo bureau veritas

  • thermometers, temperature sensors for refrigerating plants
  • thermocouple temperature sensors for diesel engines
  • resistance temperatures sensors for diesel engines
  • thermocouple sensors for diesel exhaust gas temperatures
  • temperature sensors / probes / transducers

    has been renewed by Bureau Veritas. The approval is valid until July 2021.


The approval is also valid for AUT-UMS, AUT-CCS, AUT-PORT and AUT-IMS meaning :

  • UMS- Unattended Machinery SpacesMarine
  • CCS – Centralized Control Station
  • PORT – Automated Operation in Port
  • IMS – Integrated Machinery Spaces

Along with these temperature sensors which are manufactured in Waddinxveen, we also offer other sensors with Marine-approvals such as pressure sensors made by Gems and Besta level switches.


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MID- temperature measurement: a flow towards the correct bill

Recently Thermo Electric Instrumentation has expanded their vast range of certificates with the MID (European Measuring Instrument Directive) approval.

The goal is to set standards regarding measurement precision for the accurate billing of quantities of liquid or gas. At first glance flow, level, mass and volume seem to be the only parameters that play a role. If you realize however that all these liquids and gases that are being pumped around, stored and payed  for,  expand when they get hotter, and shrink when they get colder, you understand the extra liters or gallons you gain or lose from a few milligrades  of temperature difference, count for quite a sum over the years.


Another application is the measurement of heat flow itself. In this case temperature difference between two or more sensors is used to calculate the amount of energy transferred. This applies for both heating and cooling equipment.

Thermo Electric Instrumentation has been manufacturing instruments for this purpose based on their ISO17025 approval.  However, many of our customers manufacture flowmeters or metering equipment and need to comply with this MID.

As part of the approval procedure, our RTD-sensors were calibrated and witnessed in our own in-house laboratory at different temperatures, ranging from -196 °C to 550 °C, using liquid nitrogen, melting ice and liquid salt baths. Another part of the procedure was about the electrical immunity of our designs.

The main groups of our customers Thermo Electric Instrumentation intends to serve with this feature,  are the main transmitter manufacturers or dcs-system suppliers and the manufacturers of flow metering equipment.

Below : a picture of some of the actual sensors used in the approval process.


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Thermo Electric Instrumentation strengthens its focus on furnace and boiler industry

Thermo Electric Instrumentation strengthens its focus on furnace and boiler industry, revolutionary design meets customer design and performance criteria

clamp on

In the field of tube skin or boiler temperature sensors Thermo Electric Instrumentation has much to offer. The way Thermo Electric Instrumentation knows how to combine knowledge, portfolio, research, welding and project management is a key factor to the success.

First and foremost Thermo Electric Instrumentation is able and willing to take a closer look into the exact needs and expectations of the end user. The extensive feedback and investigations have resulted in a number of special features with a proven track record.

Being able to avoid bending during elongation of the boiler tubes has provided us with the possibility to come up with an extremely resistant construction, with ceramic plasma coatings. This very same development gave us the opportunity to develop a truly online retractable skin thermocouple. Both have been tested and investigated thoroughly. After years of service, the online retractable skin thermocouple proved easy and useful. The resistance to the harsh combustion environments has been investigated through a number of destructive and non-destructive tests, and the mere fact that they have outlived their predecessors by far proves this.

When to use a shield, the location of the thermocouple  within the shield and the dimensioning, positioning and welding are, as expected, of key importance to the reduced influence of the irradiation by the burners and heat flow from the gasses.

Nevertheless, the more classic and standard designs with expansion coils and regular weld pads or offline retractable designs show an ever increasing demand, especially when combined with the more resistant alloys and our project support during the exciting period of a shut down or revamp.

The revolutionary new  “non-welding” design has been in service for over a year now. Measurement output is much closer to reality, due to an improved contact between tube and thermocouple sheath. Expect us to keep you informed over the years to come.

For more information or inquiries, please contact

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‘Proflexi’ Multi-Thermocouples

‘Proflexi’ Multi-Thermocouples assemblies installed and commissioned in brand new Diesel Desulfurizer Unit

Diesel desulfurizer unit

In succession Thermo Electric Instrumentation (the Netherlands) manufactured, installed and commissioned their ‘Proflexi’ Multi-Thermocouples assemblies. This time Thermo Electric Instrumentation was selected to execute the job for a a brand new Diesel Desulfurizer Unit to achieve modern Euro-norms. For this project, 4-fold and 12-fold ‘Proflexi’ Multi-Thermocouples assemblies are routed, fixed and supported inside the reactor to measure at several points on a plane just below or above the tower internals. The project has been supervised by qualified and experienced Thermo Electric Instrumentation staff.

The combination of Thermo Electric Instrumentation’s turn-key management; to do the complete engineering manufacturing, installation and commissioning by one company was one of the key benefits and reasons why Thermo Electric Instrumentation was selected and successfully executed this project. For more information or inquiries, please contact

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