Published 2026-03-31

The right temperature during asphalt paving is crucial for a durable, durable and dense asphalt pavement. Therefore, accurate temperature measurement is an important part of a successful paving process. With a robust temperature gauge and a durable plug-in sensor, you get full control over both core and surface temperature, making it easy to ensure the best possible results for every paving project.

Why temperature control is crucial

Temperature has a major impact on the compactibility, durability and bonding of asphalt to the subgrade. If the asphalt is too cold, the mass becomes stiff and difficult to compact, which can result in a porous pavement with a high void content and an increased risk of cracking and faster degradation by traffic, water and frost. If the asphalt is too hot, the binder can be adversely affected by increased oxidation, which deteriorates the properties of the mass. It can also lead to the binder penetrating the surface – so-called bleeding – which makes the surface slippery and less durable.

For best results, paving should be carried out at ground and air temperatures above 5°C, preferably between 10-25°C, which provides optimum workability and ensures that the pavement adheres properly to the substrate.

Ensure quality and sustainability

Using a temperature meter or IR thermometer together with a plug-in sensor provides a flexible and reliable solution for temperature measurement in the asphalt core. The robust testo 925 temperature meter provides accurate measurements directly in the asphalt mass and is designed to withstand harsh environments. In addition, it has practical features such as an illuminated display, min/max display and a hold function that allows you to freeze measurements. You can also set limit values to receive audible alarms when these are exceeded. Thanks to the connection to the testo Smart app, you can also easily document and share measurement values directly on your mobile.

The testo 830-T2 IR thermometer enables fast and non-contact measurement of surface temperatures. Connect a plug-in sensor to get a complete instrument for both core and surface temperature. Adjustable emission factor allows you to customize the measurement for different materials, while the 2-point laser sight ensures you measure on the right surface. Features such as min/max display, hold function and alarm when limit values are exceeded are also available.

For a convenient and complete solution, we offer ready-made sets for temperature measurement in asphalt, based on testo 925 and testo 830-T2 respectively, together with a durable insertion probe and practical storage case. These kits make it easy to work efficiently, ensure the right temperature and deliver a durable and aesthetically pleasing asphalt pavement.

Published 2024-10-31

Do you occasionally find yourself vacuuming refrigeration systems? Then you know how much time it takes, not least to monitor the processes. In this article, we describe how a connected, fully automatic vacuum pump makes your job easier and more efficient when vacuuming heat pumps.

– The smart vacuum pump testo 565i offers a unique solution for vacuuming heat pumps and cooling systems, says Pelle Pedersen, product specialist at Nordtec.

Vacuum suction of larger plants can take many hours, followed by holding tests to determine how tight the system is. All this is solved by Testo’s unique pump – with minimal work for the refrigeration technician.

Smooth duo for vacuum suction

When purchasing the testo 565i, it is a good idea to supplement it with the testo 552i vacuum meter. The combination of these two measuring products is a smart solution for several reasons.

Firstly, it doesn’t matter if your other equipment, such as pressure gauge racks, is from Testo or any other manufacturer. The vacuum pump and the vacuum gauge are all you need to perform vacuum suction. For others, it is easy to assemble, get started and perform vacuum suction. The pump takes care of both vacuum suction and hold tests without the involvement of the refrigeration technician. The vacuum meter is wireless and easy to install. And last but not least, you manage and have an overview of the entire process on your mobile (we will return to this later in the text).

– If you have a digital pressure gauge from Testo and want to connect it, you can of course do so. But it is not necessary. Everything can easily be done on your own mobile phone,” says Pelle Pedersen.

How to use the vacuum pump

So how does the testo 565i work? Well, here’s how to make vacuuming easy and efficient:

1. Connect the pump to the cooling or heating system
2. Mounting the testo 552i vacuum meter on the system
3. Open the testo Smart app* on your mobile
4. Start the pump and vacuum gauge
5. Connect both to the testo Smart app
6. Select target value and maximum value in your mobile
7. Select number of hold tests in the same mobile view
8. Click on start and the vacuum is on!

* The app is available on both Apple Store and Google Play. It is free to download and use.

Automatically starts a hold test

– It is not more difficult than that. The refrigeration technician can then devote himself to other tasks while the vacuum extraction is in progress,” says Pelle Pedersen.

When the desired vacuum value is measured by the vacuum gauge, the pump automatically starts a hold test. If the vacuum level remains unchanged, the whole process is terminated. Otherwise, the pump performs further vacuuming of the system, followed by a new hold test.

Once the pump determines that the system is free of impurities and maintains the correct vacuum level, the refrigeration technician will receive a notification on the testo Smart app on their mobile phone (or on the pressure gauge rack, if one is used) and can charge refrigerant.

Monitoring and reporting on your mobile

More and more refrigeration engineers are discovering the benefits of the Testo smart vacuum pump.

– It saves me a lot of time. You just set the vacuum value and press start on your phone and the pump does the rest,” says Emil Öien at Kyl & Industriteknik i Väst AB.

William Giorgi, one of the partners at the same refrigeration company, agrees.

– The fact that we can follow vacuum suction in the mobile makes it easy for us to keep track of processes without having to be at the pump itself, says William and adds:
– We also get easy access to reports with clear graphs directly in the mobile. This convenient report function also saves us a lot of time.

Can handle flammable refrigerants

As well as effectively removing all impurities in cooling and heating systems, the testo 565i is a robust, highly safe and reliable vacuum pump. It is compatible with flammable refrigerants of classes A3 and A2L. And the pump has an integrated non-return valve, which contributes to safe operation and prevents vacuum loss even in the event of a power failure.