The exhaust gas temperature sensor is an extremely important element of the entire heating system, providing the ability to react immediately to any irregularities. Designed to record even the smallest changes in exhaust gas temperature. Its role is therefore invaluable. It is definitely worth getting to know this device better!
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Proper exhaust gas temperature in the furnace - what to remember?
The proper temperature of the exhaust gases in the chimney depends on two main factors - the type of fuel and the type of heating device. Older boilers have different requirements in this respect than modern devices, which is why the issue of exhaust gas temperature is completely different. It is much higher, ranging from 230 to 350 degrees Celsius. Considering this exhaust gas temperature, you might think that it is too high, but in these boilers it was completely safe for the chimney, as it ensures its undisturbed operation in dry mode. This is because moisture had no conditions to condense on the walls. At the same time, a strong chimney draft was guaranteed. On the other hand, in such devices, the combustion process was not particularly controlled, which had a negative impact on the efficiency of the boiler.
It is different in modern class 5 boilers, which are both economical, and therefore cost-effective, and environmentally friendly. And thanks to this, they are able to optimally use the heat contained in the fuel. However, there is a price to pay, because it is reflected in the exhaust gases, or more precisely in their lower temperature (100-110 degrees Celsius). In principle, this is good, because the heat does not escape outside, but heats the rooms accordingly. However, the lower temperature affects the chimney, because the water vapor condenses, which causes corrosion. What is worse, the chimney draft is weaker if we compare it to exhaust gases at a higher temperature. So we can see that lower values are appropriate, but it has its drawbacks. So the question arises: how to make the exhaust gas temperature increase when we need it. We will deal with this issue in the next paragraph.
How to increase exhaust gas temperature?
Sometimes it is worth raising the temperature of the exhaust gases by increasing the draft in the chimney. There are several ways to do this. One of them is to mount special covers, the main task of which is to cover the outlet in such a way as to prevent the reverse suction of air and exhaust gases. If we have exhaust or smoke ducts, a good solution, leading to an increase in the draft in the chimney, and thus the temperature of the exhaust gases, is a "fireman" type cap. This is facilitated by its design, thanks to which the phenomenon of negative pressure occurs. In this way, the exhaust gases escape more easily from the chimney channel to the outside.
The increase in exhaust gas temperature is also possible thanks to appropriate fans, which affect the regulation of the work and power of the chimney. Such devices artificially generate draft. However, remember that the increase in temperature should be controlled, which is helped by exhaust gas temperature sensors. It analyzes it, which allows to reduce chimney losses, and which has a positive effect on both the efficiency of the boiler and the savings in fuel consumption. The exhaust gas temperature sensor is therefore an absolute must.
How to recognize a damaged exhaust gas temperature sensor?
However, it may happen that the temperature sensor is damaged, so it is worth knowing how to recognize the basic symptoms of this condition. Especially since in the case of exhaust temperature sensors, there are situations when the damage that occurs may be the beginning of a larger failure. However, it is often necessary to replace it with a new one so that the exhaust emission readings are correct. Recognizing a damaged exhaust temperature sensor can be crucial to maintaining the safety and efficiency of the heating system.
To determine this, we need to monitor the operation of the furnace, because most often it is the exhaust temperature that can tell that something is wrong. It is unstable. Let's read the exhaust temperature directly from the furnace display or control panel to rule out irregularities. A visual inspection of the sensor is equally important, because sometimes a sensor failure is visible at first glance and it is known that it results from mechanical damage, such as a crack in the housing.
In the case of exhaust gas temperature sensors, comparative measurements can also be helpful, provided of course we have access to measuring tools. This allows us to compare these values, determining whether a sensor failure occurs. Sometimes it is necessary to consult a qualified service technician, who will thoroughly examine the problem and propose appropriate solutions. He will also advise on other issues, such as exhaust gas recirculation temperature, exhaust gas cleaning system, help with the particulate filter, etc.
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Exhaust gas temperature sensor installation location - what is the best?
There are different types of exhaust temperature sensors, but regardless of which one you choose, each one should be installed in the same places. One of them is located directly on the chimney section. This is definitely the most effective place to install it, because the sensor can precisely monitor the temperature of the exhaust gases leaving the boiler or furnace. It is also advisable to place it close to the exhaust gas outlet, so that the temperature measurement immediately after leaving the heating system will be very accurate. Another good location is the ventilation system, but it should be noted that this is not always possible.
Correct installation of the exhaust gas temperature sensor - step by step
As you can see, the role of exhaust gas temperature sensors is crucial, but they must be mounted in the right place for them to work well. Correct installation is equally important. Much, of course, depends on the sensor model and the heating system, but the sequence of actions is always the same.
The first and most important thing is the safety issue, i.e. turning off the power to the heating device. Once we have done that, let's choose a suitable place for installation, using the tips we gave in the previous paragraph. An important step is to prepare the installation site. Let's make sure it is clean and free of other inconveniences. If everything is in order, we can start the physical installation, attaching the sensor according to the manufacturer's instructions. It is important that it is stably mounted.
Usually, you also need to connect it electrically. Here, pay attention to polarity, because most sensors have it, so you have to follow it. It is extremely important to protect the cables from damage, using pipes or covers for this purpose. After installation, you should also check the electrical and mechanical connections. Sometimes, the sensor needs to be calibrated.
Exhaust gas temperature sensors at the Onninen wholesaler
The assortment of the Onninen plumbing wholesaler includes innovative exhaust temperature sensors, which are dedicated to monitoring exhaust temperature in heating systems. We have selected 3 interesting proposals.
- We start with the De Dietrich 85757742 exhaust gas temperature sensor . Very convenient to use. Equipped with a clear control console display, on which we can read the exhaust gas temperature, which will allow you to monitor the cleanliness of the boiler body exchange surface. Importantly, in a cascade installation, it is possible to connect the exhaust gas sensor to each boiler. Sensor technical data: length - 0.21 m, width - 0.16 m, height - 0.04 m, weight - 0.2 kg, volume 0.001 m3.
- The Pellux Ecomax 20647 exhaust gas temperature sensor is another in a series of reliable sensors that ensure safe use of the heating system. It eliminates the risk of overheating and potential failures by detecting them earlier, so we can react quickly. Technical data: length - 0.4 m, width - 0.03 m, height - 0.03 m, weight - 0.21 kg.
- You can also choose the ESBE CTF151 thermostatic exhaust gas temperature sensor for controlling circulation pumps and thermoregulators. Equipped with a temperature sensor that is connected to the switch module. With its help, you can control the electrical supply to the circulation pump, similarly to a thermoregulator with an integrated circulation pump. The temperature sensor can be mounted on the outer surface of the exhaust pipe or inside it - using an immersion sleeve. Its technical data are as follows: length - 0.132 m, width - 0.09 m, height - 0.075 m, weight - 0.271 kg, volume - 0.001 m3.
In summary, the exhaust gas temperature sensor is an absolute necessity in the entire heating system. Thanks to it, we will react to the slightest temperature changes. It is equally important to choose a high-quality model.
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