In many situations, it is essential to measure surface temperatures. Think of HVAC systems for monitoring the temperature of radiators and pipes or temperature detection on electronic components and circuit boards to prevent overheating.

Contact sensors, also known as surface temperature sensors, are essential instruments for measuring temperatures on various surfaces in industrial environments and the heating, ventilation and air conditioning sector. This non-invasive method of temperature measurement offers a reliable solution for numerous applications. In this article, we look at the many possible applications, the advantages and disadvantages of this measurement technology and the optimum installation conditions for contact temperature sensors.

We would like to invite you to take your time to look around our online store and our contact sensors.

Our product range

  • Analog temperature sensor (4-20 mA, 0-10 V)
  • Digital temperature sensor (Modbus RS485, CANopen)
  • Magnetic inductive flow meter
  • Passive temperature sensor (resistance thermometer)
  • Smart differential pressure transmitter for low measured values
  • Flow monitoring of liquid media
  • Temperature-current converter
  • Temperature switch
  • Thermocouple
  • Volume flow and air flow velocity meter

Professionalism around contact sensors

When we decided to found SEIKOM Electronic over 30 years ago, it was important to us right from the start that we would only offer our customers products of the highest quality. The result today is a TÜV-certified product range with numerous innovations that impress with their performance and functionality, just like our contact sensors. As one of the leading suppliers of Innovative measurement and control technology we also have everything you need for reliable pressure measurement with Pressure transmitters or make sure that in all environments with air quality sensors you have the Measure air quality can. In addition, our Heating, ventilation, air conditioning-devices and much more. We have a particular specialization with regard to a Safety Integrity Level range and are able to provide you with reliable explosion protection in ATEX areas with, for example SIL flow monitor support.

What do contact temperature sensors do?

A contact sensor, also known as a contact sensor or surface sensor, is a temperature sensor that you attach to or on a desired surface, such as pipes, tanks or machine parts. Here, the system sensor records the temperature non-invasively, which you can read quickly and without delay.

Contact sensors are the first choice for small pipe diameters and in many other cases. Thanks to their compact design and smart functionality, the measuring instruments can even be placed on curved or prism-shaped surfaces without any problems and transmit their measured values to you. With a contact sensor, you retain control over flow temperatures and thus reduce the risk of faults.

What are the advantages of a contact sensor?

One of the biggest advantages of contact temperature sensors is that you do not have to disturb the process itself in order to measure a temperature, thanks to the non-invasive measurement. Complicated insertions or seals are not necessary. This means that, in addition to easy handling, installation using Clamps or Magnets possible without great effort. This allows measurements to be carried out even when it would be too complex or dangerous to penetrate the system.

High-quality contact sensors from our company record temperatures and temperature changes directly, which enables you to react quickly in an emergency. Another advantage is the flexibility of contact temperature sensors, as they are suitable for a variety of surfaces. Even curved or inclined surfaces are no problem. Once fitted, they are able to measure a wide range of temperatures, which makes them extremely interesting for many industries, especially those in which media with high temperatures circulate in systems.

Finally, the attractive price-performance ratio of contact sensors should also be mentioned. Unlike other temperature sensors, they are cost-effective to purchase and do not require any expensive installation equipment or special protective covers.

Where can a contact sensor be used?

It should be emphasized that contact sensors are suitable for a wide range of applications. In this context, an investment is even more worthwhile. They are even indispensable in many branches of technology and industry.

But feel free to take a look for yourself.

The flexibility of contact temperature sensors makes them ideal for temperature monitoring in a wide range of industries. In industry, for example, they are used for

  • Monitoring the motor winding temperatures in electric motors
  • Measuring the surface temperature of pipes in process plants
  • Temperature control of heating plates and belts in plastics processing
  • Monitoring of bearing housing temperatures in mechanical gearboxes
  • Temperature measurement on boiler and furnace walls in power generation plants
  • Safety monitoring for overheating in battery management systems
  • Quality control in food processing through surface temperature monitoring
  • Maintenance and fault diagnostics in automation technology through precise temperature measurements

In the field of heating, ventilation and air conditioning (HVAC), the following areas are common applications for contact sensors:

  • Temperature monitoring of radiators and heat exchangers
  • Control and monitoring of flow temperatures in heating systems
  • Recording the temperature in air conditioning ducts for air flow control
  • Monitoring the condenser temperature in cooling systems
  • Measuring the pipe temperature in district heating networks
  • Checking the surface temperature on steam pipes
  • Measuring and monitoring the temperature of solar thermal systems

This versatility of contact sensors enables precise control and regulation of temperature-dependent processes and helps to increase efficiency and save energy.

Non-invasive vs. invasive measurement

Compared to invasive measuring methods such as immersion temperature sensors, which are inserted directly into the medium, contact temperature sensors are non-invasive, i.e. they are only attached to the surface of the measuring point. Contact sensors therefore do not require any intervention in the system to be measured. This simplifies installation and maintenance and avoids the risk of contamination or system interruptions. Due to their non-invasive nature, they reduce the risk of leaks or other damage to the system. This makes them ideal for applications where hygiene or system integrity are of paramount importance.

On the other hand, non-invasive measurements can be more easily influenced by the ambient temperature or air currents, which can lead to potential inaccuracies. Measurement accuracy depends largely on correct mounting and heat transfer between the sensor and the surface. Air gaps or poor heat transfer can lead to incorrect measurements.

Optimal installation conditions

Correct installation of the contact temperature sensors is crucial in order to obtain precise measured values. The use of heat-conducting paste can contribute significantly to improving heat transfer between the sensor surface and the measured object. The paste minimizes air gaps and ensures minimal thermal resistance. In addition, the sensor should be insulated against environmental influences in order to prevent the radiation of ambient heat and ensure measurement accuracy.

Available output signals from contact sensors

Contact temperature sensors are available in various designs, which are selected depending on the area of application and the requirements of the measuring task. The most common types include contact sensors with analog output, resistance thermometers and thermocouples.

Contact sensor with analog output

These contact sensors convert the measured temperature into an analog signal, typically in current or voltage form (e.g. 4-20 mA or 0-10 V). They are ideal for simple temperature monitoring tasks where the signal is sent directly to a corresponding display or control device. The uncomplicated transmission technology makes them robust against interference and widely used in industry.

Resistance thermometer

Resistance thermometers are an ideal choice, especially in areas where high precision is required. These use the property that the electrical resistance of a metal (often platinum) changes with the temperature. The classic designs, such as PT100 or PT1000 sensors, offer high measurement accuracy and can be found in many industrial and HVAC applications due to their stability and precision.

Each of these types of contact sensors has its own advantages and characteristics, which determine the selection depending on the application and the associated requirements for accuracy, measuring range, response time and environmental influences. At SEIKOM Electronic you will find a wide range of contact temperature sensors adapted to your specific needs to ensure optimum performance and reliability in your systems.

Contact sensors or surface sensors are an excellent choice for applications that require fast and uncomplicated temperature monitoring. At SEIKOM Electronic, we offer a selection of highly precise and reliable contact probes for your specific requirements.

Whether in industrial automation or in the HVAC sector, our experts are on hand with advice to help you find the ideal measurement solution. Visit our website www.seikom-electronic.deto find out more about our Product categories and services and optimize the performance of your temperature measurement.