Installation] Temperature and humidity measurement in a high temperature and high humidity environment TESTO 6681 product installation and operation

Hello, I am Pilseung Jeong, assistant manager of RS Korea's technical sales department. As the title suggests, today's story is about measuring temperature and humidity in a high temperature and high humidity environment. https://blog.naver.com/rs-korea1/223551747412 As the final stage of a project conducted with the research institute in the above posting, we are pleased to be able to provide information on products that RS Korea has not previously handled frequently. First of all, for those who are lazy to read the previous post through the link, I will summarize the story so far. Part 1 1. Research is being conducted to increase hardness by injecting CO2 into concrete curing.2. FIX800 product is applied to measure the amount of CO2 injected and maintained.3. Condensation water generated in the process of creating temperature and humidity conditions can cause product failure4. The problem was resolved through the sampling equipment developed by RS Korea and the measurement was performed normally. Thanks to the success of Part 2, Part 1, a large chamber was made and the same experiment was conducted. Because a non-standard chamber was manufactured, the controller or temperature and humidity sensor used in the existing chamber could not be used. Through the meeting, RS Korea decided to supply measuring equipment for the newly manufactured chamber. This is Part 3, which consists of a set of CO2 meter + data logging and controller + temperature and humidity measurement equipment, delivery and installation. I'm going to summarize the last part that I couldn't upload in my last post due to length. Most of it was explained in Part 2, but ultimately the core of this project is the concrete curing strength according to the relationship between CO2 injection + temperature + humidity. Accordingly, what RS Korea consists of is a CO2 sensor, temperature sensor, humidity sensor, and a data logger and controller that can manage all of this data. After writing this down, it seems like we are doing it all. There are so many temperature and humidity sensors sold online that you don't even need to look for an expert. However, the story is different in high temperature and high humidity environments. Why!

Most humidity sensors used throughout industrial measuring instruments use the principle of capacitance, with the sensor part exposed to the outside like this and most of them having a guard to prevent physical damage. If you search for humidity sensors on Google, you will see that most sensor designs are very similar. The exposed sensor shows good performance in terms of fast response speed and measurement accuracy, but because the electronic circuit is exposed, it is vulnerable to moisture (humidity and moisture are different). Each brand indicates that it can measure humidity from 0 to 99%RH, but in fact, if the humidity is over 80%RH, it is an environment in which you can catch water droplets even if you reach out your hand. (It seems like the humidity was this high this summer.) If water droplets touch the board in such a high humidity environment, measurement errors may occur or failure may occur due to an electrical short. Therefore, what is needed is the high humidity humidity sensor indicated in the title. Let me introduce you. This is TESTO 6681, an environmental transmitter from TESTO.

This is an environmental transmitter that can measure various parameters depending on the sensor installed. There are various brands that handle environmental transmitters, but there are not many models that can be equipped with temperature and humidity sensors for high humidity. Among them, the one I chose was the 6614 probe. Since listing out detailed specifications doesn't suit me, let's talk about it along with on-site photos.

This is the TESTO 6681 model with a brilliant design. It is made of stainless steel and is quite heavy. At the bottom of the product, there is a cable gland for wiring and a connector for connecting a dedicated sensor. I'm not sure if you can see it clearly in the photo, but you can see the connection pin deep inside.

The sensor is the core of this content. The thick kid on top is the humidity sensor, and the thin kid on the bottom is the temperature sensor. It has the same sensor shape as the example in the top photo, but it has a protective cap. The reason the humidity sensor is so thick is because it is heated inside. When the humidity is high enough for moisture to form on the sensor, a heating element operates inside the sensor to prevent condensation. Depending on the brand, there are models that measure temperature and humidity simultaneously with a single sensor, but one fatal drawback is that the heating element that operates to prevent condensation affects the temperature sensor, making temperature measurement temporarily impossible. If something is missing in a situation where you need to see trends that change every moment, it becomes difficult to manage meaningful data. I may sound grandiose, but this is all I have to say. Now, I will explain the installation process and the remaining details.

If you separate the case according to the manual, the parts will appear in very intuitive positions. This type supplies power to the equipment and outputs a current signal. The empty space on the left side of the equipment is judged to be the space where parts are installed when other parameters such as pressure are requested. As soon as I turn on the power and connect the dedicated probe, it is recognized right away. It's so relaxing that there's nothing to explain.

As soon as I plug in the sensor, it recognizes it right away, so I have nothing to say. The next step is to check and set the 4-20ma output range according to the user's required environment. Due to the ethnic characteristics of Koreans, I tried pressing the button without looking at the manual, but there was no difficulty at all. Determine the parameters of each channel (temperature, humidity, pressure, etc.), select the units appropriate for the parameters, and set the output range of 4-20ma.

Set the receiver range according to the set output range. In industry parlance, this is called mapping. You can see that the data logger and transmitter values ​​are almost identical. Of course, some errors that occur due to the nature of analog signals must be taken into account. Now load the product into the chamber.

A basic bracket is provided on the back of the product. Just detach it, fix it in advance on the metal plate of the control box, and then insert it. The large sensor fits perfectly into the pre-machined high box holes. It must be an incredible sense of distance. The temperature transmitter goes inside the control box and has the same external configuration as the existing photo. Start the test run.

Before injecting CO2, the temperature was raised to 65℃ by manipulating the hot air line. As a result, the humidity in the air, which was around 55%RH, began to drop differently than the researchers expected. In order to provide sufficient humidity, water was filled in the chamber, but the humidity did not rise, so it was surprising. Currently, the operating temperature is around 65℃, so even considering latent heat, moisture from water has not yet risen, and rather, the inside will be dry like a dryer. As a result of the long-term test, we suggested that in order to maintain the appropriate temperature and humidity, it would be better to keep the temperature range at the current level but install a separate device to boil water to create moisture. In conclusion, I will conclude the long content by summarizing the meeting and installation related to concrete CO2 curing and what I wanted to talk about in the three posts about it. Problems that could and did occur in the moisture and humidity environment were solved through the development of a sampling system. Trust was gained through problem-solving ability and quick response. Participated in the project. We accurately understood the user's request and provided the desired configuration. Now, RS Korea has a configuration that can measure and control temperature and humidity (pressure, if necessary) beyond stable gas measurement in a high temperature and high humidity environment. We are waiting for inquiries from many people who face the wall of measurement in any environment such as safety, production, research, or development. Please contact us through the business card below and we will do our best to provide you with the solution you want by going anywhere in the country.

#GCU#moisture removal#humidity removal#gas measurement#dew point#dew point#dew point#preprocessing equipment#gas sampling equipment#gas analyzer#gas meter#CO2 meter#CO2 analysis equipment#CO2 analysis#CO2 capture#curing#concrete#high humidity#high temperature#temperature#humidity#transmitter