GANN Main Catalog Electronic Moisture Meters NO.: 20050 - Page 105
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Textversion GANN Main Catalog Electronic Moisture Meters Page 105
MEASURING ACCURACY building materials with the latest calibration curves can be measured with good accuracy as opposed to mixed brickwork. But exact percentage values are often not necessary, and so-called comparative measurements are absolutely sufficient. CAPACITIVE RADIO FREQUENCY MEASUREMENT The so-called “ball probe” invented by us is a sensor for detecting moisture in many different materials (e.g. damage caused by moisture in rooms and buildings, mobile homes, caravans, boats, concrete, or plastics as well as in many other solids). Also, unmixed building materials having the latest calibration curves can be measured with good accuracy using this measuring technique. However, the accuracy obtained is less when measuring mixed brickwork or layered compounds consisting of different materials. As mentioned before, exact percentage values are often not necessary, and so-called comparative measurements are absolutely sufficient. MEASURING THE RELATIVE AIR HUMIDITY IN HOLE For this purpose, high-quality air humidity sensors suited for high humidity values must be used to determine moisture in solids (e.g. concrete, screed, brickwork). For measuring, the sensor is inserted into a prepared hole. The sensors should have good long-term stability in high air humidity (80 to 95% R.H.) as well as ±3% accuracy or better. The air humidity values are converted into weight percentage values for building materials using sorption isotherms either by means of automatic processorsupported conversion within the units or using tables provided in the operating manual. CALCIUM CARBIDE METHOD The humidity content of screeds is determined by means of a CM unit using a mechanical-chemical process. Accuracy essentially depends on correct sampling (across the entire cross-section, low humidity loss during sample preparation) and tightness of the pressure system. n PROPER MEASUREMENTS The headline already tells what is meant. An “ideal” unit should be self-explaining, self-learning and work as independently as possible. Our Hydromette ® units have been designed and engineered following these considerations. However, there will always be situations in which you will have to look into the operating instructions. Reading the operating instructions is one of the less pleasant and time-consuming things. But you will find that many problems will virtually settle on their own. Even if you have never worked with one of our units, reading the instructions that contain many tips on the particular topic and performing a small trial session will enable you to carry out your measuring task like a professional. Your knowledge, your eyes, your technical skills, and our meters are parts of a successful top team. It might be quite embarrassing “to be eaten up” by the lawyer of the opposing side, when the surveyor reads the instructions to you, or to be made to pay up for a damage, although you have the best meter on hand. You will find a lot of sticking points in connection with moisture measurement which you have not taken into account and which could have easily and quickly been avoided by means of properly performed measurement. Spare the second visit on site, the faulty survey report, the damage that could have been avoided in most cases. We are here for you – when there are problems with moisture measurement or when you have no answer to your question, irrespective of the comprehensive operating instructions. MEASURED VALUE ASSESSMENT Professional assessment of the measured value indicated is the task of the expert – e.g. the decision on whether the 95 digits measured are still sufficient or too much considering a specified value of 90 digits. To assess e.g. an air humidity measured value, it is important to know whether the measurement was made in the more humid northern area or in the Alps region that is more dry and in which season it was made. Or whether the measurement was made in a humid vaulted cellar or in the hobby room of a newly erected building. Are there many flowers or hydroponics with fountains in the living room? All these and other factors have an impact on the “natural” humidity in the household. And in the end, only you as the expert can assess these different conditions. Similarly, this applies to structural moisture and to the moisture of other materials. In addition to the tips in our operating instructions, you may find other tips given by the manufacturer of the material or on the web, or you may consult our expert consultants. We are your competent partner. 105
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The manufacturer is exclusively responsible for the content, price and article details of the products and offers presented in the catalogues. Subject to technical and optical changes by the manufacturer and errors excepted.