Customised temperature probes & sensors
Quality born of tradition – Innovative measuring technology from Therma
Welcome to Therma Thermofühler GmbH, your innovative and experienced partner in all aspects of temperature measurement. For over 30 years, we have been highly regarded for our professional expertise, our high-quality products, and our impressive service and delivery capabilities.
Benefit from our experience, our insistence on the utmost precision and our comprehensive understanding of temperature measurement.
Product groups – from the proven standard products to individual solution
Welcome to the Therma shop
Reliable even under extreme load thanks to sophisticated thermal sensor systems from Therma.
We have been held in high esteem for our technical expertise, our high-grade quality products, our performance and ability to supply for more than 30 years. Profit from our experience, the high demands we place on precision and our holistic understanding of temperature detection.
Our standard products just won’t cut it for you? Are you looking for something very special?
We would be glad to consult you. Pondering ideas right through to the end and then developing intelligent product solutions – that is our strength. Find out more about our individual solutions or just ask us. We are at your full disposal.
Fast delivery times
Usually our products have a delivery time of 1 week.* Even most of our products are available from stock, e.g.
- compression fittings
- thermo-connectors and accessories
- thermo- and compensating wires and cables
- u. v. m.
*Upon request, express shipping is possible.
Thermal sensors for all temperature ranges
The most exact possible temperature measurement has long been a goal of people. In the 16th century, Galileo Galilei developed the first generation of thermometers. However, this was not uniform and was based on the expansion behavior of different liquids. The first thermometer with reproducible results was based on the Fahrenheit scale in 1715. In the 19th century, Kelvin developed an alternative scale with different fixed points for measurement. Today, in most countries around the world, thermometers are assigned to its Celsius scale, while the Fahrenheit scale is still used in the United States. In 1821 the Seebeck effect was also discovered, in which the linear temperature-dependent resistance of platinum is used. The resulting thermal sensors can also be used, for example, in very high temperature ranges.
Let us advise you on the right thermocouples
We have over 25 years of experience with thermocouples and can advise you on the right model as well as manufacture an individual thermocouple for you that is precisely tailored to your measurement conditions. The functionality of the thermal sensors is quickly explained. The Seeberg effect, discovered by Thomas Johann Seeberg, is based on the principle of thermoelectricity. Two different metallic conductors are connected to one another at a measuring and a reference junction. The choice of materials creates a temperature-dependent voltage. The temperature difference thus creates a voltage difference, called a thermal voltage. The thermal sensors are divided into types marked with letters, which are assigned to a temperature range created by the combination of materials.
Resistance thermometer with high accuracy
These thermometers differ in different designs, each of which has been optimized for various measuring conditions. A distinction is made between the type of connection, the type of sensor and metal or semiconductor resistors. With metal resistors, the aim is to achieve the highest possible temperature coefficient. This means that a change in temperature causes the greatest possible change in electrical resistance. Platinum has very good properties for achieving this effect. Nickel allows an even more precise measurement, but in lower temperature ranges. The lowest possible measuring current is introduced via the connection line, which is made of copper or nickel. Then the voltage drop is measured and the resistance is determined according to Ohm’s law.
Our thermal and compensating cables
Since the thermocouples are mostly used in high temperatures, the sensor must be installed at a certain distance. The thermo- or compensating cables transmit the measuring signal. In the case of a thermal line, the thermal voltage only occurs when it is connected to the device. It is made of the same material as the conductor in the thermal sensor. This results in higher accuracy with a tolerance class 1 limit deviation. We only sell these cables because we want accurate devices for our customers. Compensating cables fall under a limit deviation of tolerance class 2. Our extension cables are insulated with glass fibers, silicone, Teflon or glass fiber. In addition, a stainless steel jacket can act as protection against mechanical stress and a copper braid can protect against electromagnetic interference.
Clearly marked thermal plug connections
The transducer and the thermal line described above are connected to one another via a plug. The same metal conductors are used here as in the thermocouple in order to keep an accurate reading. The color coding of the plugs indicates the type and the suitable temperature range. The standard plug always ensures a secure plug connection and is easy to use. Miniature plugs are recommended when working in tight spaces. We also offer plug-in connections that lock themselves, individual models that we can assemble for you, and plugs from popular companies.
Compression fittings with numerous thread types
The connecting links enable uncomplicated installation and replacement of the thermocouples. In addition, precise adjustments can be made using the compression fittings and the required installation length can be attached directly on site. The stainless steel housing ensures high resistance and the clamping cone is optionally made of ceramic, brass, Teflon or stainless steel. A stainless steel clamping cone is firmly connected to the element and is very pressure-tight, even at high temperatures. Brass clamping cones hold well with thin thermocouples and also absorb vibrations, just like cones made of ceramic. Teflon clamp connection