Customised temperature sensors and probes | Temperature measurement technology

Temperature sensors for all temperature ranges

For a long time, people have been striving to achieve the most accurate temperature measurement possible. In the 16th century, Galileo Galilei developed the first generation of thermometers. However, this was not standardised and was based on the expansion behaviour of various liquids. The first thermometer to provide 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, most countries in the world associate thermometers with his Celsius scale, while the USA continues to use the Fahrenheit scale. In 1821, the Seebeck effect was also discovered, in which the linear temperature-dependent resistance of platinum is used. The resulting thermocouples can also be used, for example, in very high temperature ranges.

Let us advise you on the appropriate thermocouples

We have over 25 years of experience with temperature sensors and can advise you on the appropriate model, as well as manufacture an individual thermocouple for you, which is precisely adapted to your measurement conditions. The way the temperature sensors work is quickly explained. The Seebeck effect, discovered by Thomas Johann Seebeck, is based on the principle of thermoelectricity. Two different metallic conductors are connected to each other at a measuring point and a reference junction. The selection of materials results in a temperature-dependent voltage. The temperature difference thus produces a voltage difference, called thermoelectric voltage. The thermocouples are divided into types labelled with letters, which are assigned to a temperature range created by the combination of materials.

High-precision resistance thermometers

These thermometers come in different designs, each optimised for a variety of measurement conditions. They are categorised by their connection type, probe type 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 for even more precise measurements, but only in a narrower temperature range. The smallest possible measuring current is introduced via the connecting wire, which is made of copper or nickel. The voltage drop is then measured and the resistance is determined according to Ohm’s law.

Our thermocouple and compensating cables

Since the thermocouples are usually used in high temperatures, the measuring transducer must be installed at a certain distance. The thermocouple or compensation cables therefore transmit the measurement signal. With a thermocouple wire, the thermoelectric voltage is only generated when it is connected to the device. It consists of the same material as the conductor in the thermocouple. This results in a higher accuracy with a tolerance class 1 limit deviation. We only sell these cables because we want accurate devices for our customers. Compensating wires fall under the tolerance class 2 limit deviation. Our thermocouple wires are insulated with glass fibres, silicone, Teflon or glass fibre. In addition, a stainless steel sheath can provide protection against mechanical stress and a copper braid can protect against electromagnetic interference.

Clearly labelled plug-in thermocouple connectors

The transducer and the thermocouple wires described above are connected to each other via a plug. The same metal conductors are used here as in the thermocouple in order to maintain an accurate measurement. The colour coding of the plugs indicates the types and the suitable temperature range. The standard connector always ensures a secure connection and is easy to use. If you are working in a small space, miniature connectors are recommended. We also offer plug connections that lock themselves, individual models that we can mount directly for you, and connectors 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 desired insertion length can be directly attached on site. The stainless steel housing ensures high durability and the clamping cone is optionally made of ceramic, brass, Teflon or stainless steel. A stainless steel clamping cone is firmly attached to the element and is very pressure-tight even at high temperatures. Brass clamping cones hold well on thin thermocouples and also absorb vibrations, just like ceramic cones. Teflon clamping cones can be used multiple times, but they can only be used at temperatures up to 200 degrees.

Cutting-edge thermal sensors for extreme loads in motor sports

For several decades, we have been developing and producing high-quality thermal sensors for motor sports in-house. We are a valued partner of numerous racing teams, including Formula 1, as well as renowned universities and research teams with a passion for racing. Our innovative thermal sensors can be ordered directly as standard versions or can be customised for you. Whether you need thermal sensors for tyres, braking systems or exhaust systems, we are the first choice for many motorsport professionals.

Wide range of high-quality accessories

We offer accessories for all areas of temperature measurement technology. For example, we offer extensions and cables for all types of thermocouples, as well as connectors and adapters. Of course, we also advise you on accessories such as transducers and analogue-digital converters. Do you need a modern display device that is compatible with your thermocouple? We can help you with that too. Why not take a look at our online shop for a high-quality heat protection hose or mounting adapter? We will be happy to provide you with expert advice.