PCE Instruments PCE-PMI 3 Moisture meter Building moisture reading range 0 up to 99.9 % Wood moisture reading range 0 up

Building moisture meter / screed humidity meter (carbide method) screed humidity meter with relative scale, scales for weight percentage and result scale based on THE CM method, with different menu languages / display rotatable / automatic switch-off for battery protection / for screed, Concrete and wood the screed moisture meter / the screed moisture meter is a small and reliable measuring device for determining the existing moisture in for example screed, concrete and wood. Corresponding scales for measuring humidity are already stored in the library of the measuring device. After selecting the scale, the required measurement can be performed with the moisture meter. The measurement result is displayed on the screed moisture meter in a few seconds, both numerically and graphically. A separate alarm limit can be set for each scale for the humidity meter. As soon as the set alarm limit is exceeded, an acoustic alarm is triggered on the screed humidity measuring device. In order to save the batteries inserted, the tester switches off automatically after 5 minutes when not in use. Another special feature of the measuring device is the possibility of displaying the calcium carbide method (CM% / CM method) with screed. Even with this measurement, the moisture meter is placed on the surface to be tested. Using the corresponding scale, the measured value is converted into A CM% value (calcium carbide method). This gives the soil layer a guide value via the calcium carbide method. Calcium carbide Method (CM Method) for Estrich Residual moisture measurement is a well-known method for indirect moisture measurement. The carbide method is subject to clearly flawed influences. As the practitioner on site is used to this method of moisture measurement for decades, it still plays a, if decreasing, role, e.g. in the assessment of the adhesion of floor coverings on the floor. In this method, calcium carbide reacts with water to calcium hydroxide and acetylene. The water comes from the previously obtained sample material (10 ... 50 g), which is crushed in the reaction vessel by steel balls also entered into the vessel by shaking for about ten minutes and allowing the moisture in the vessel to react with the calcium carbide. The gaseous acetylene causes a pressure increase which is measurable and can be directly correlated with the moisture content. Stainless steel reaction vessels are used with a pressure gauge indicating the container duck. The maturity of an screed can thus be determined indirectly but sufficiently precisely by MEANS of THE CM method. Advantages OF THE CM method / disadvantages of THE CM method The advantages of THE CM method for moisture measurement in the screed are the fast feasibility of the on-site test (in contrast to the time-consuming darrtest), the sufficient accuracy and the court usability of the results in case of dispute. Due to strongly changed cement-screed mixtures (significantly changed water content / moisture content) in the modern construction, the significance of THE CM method can no longer be evaluated as very selective and the limit value of 2% moisture in the cement screed, which was previously used for moisture evaluation, can lead to incorrect decisions in the assessment of the suitability for the documents. Additional benefits of the screed humidity meter from PCE Instruments The screed humidity meter from PCE Instruments offers the practitioner on site several possibilities for the humidity measurement or assessment of the residual moisture in the screed. The pure relative value measurement (relative scales), the reference to weight accents and additionally the evaluation of the screed humidity by means of an evaluation approximated by THE CM method. This makes the soil moisture meter the ideal tool for checking the residual moisture in the screed or for determining the amount of evidence carried by the floor layer. The test moisture meter is adjusted and calibrated by PCE Instruments and can also be recalibrated according to the specifications, for example, by the ISO manual. The calibration confirms and certifies that the screed humidity meter / screed humidity meter always works in the specified measuring range with the specified accuracy. In the case of new buildings, in the renovation of old buildings or even of a separate room, the quality must always be the first priority. One of the most important points on the list of things to pay particular attention to are floors. Guided by the desire to end a construction earlier, one often goes wrong and neglects the requirements, such as applying the screed, the time it takes to dry, and the monitoring of the drying process. As a result, major problems can occur shortly after the renovation. Although the screed is a material that is not obvious, one should not save on it. The quality of the floor determines the comfort and long-term life of the entire construction. Screed is used to compensate for a floor, to heat it up, to remove cracks, or also to prepare it before applying the main layer, which can be completely different (cork, parquet, linoleum, tiles, etc.). The most important point to consider for the concrete screed is to take time at work. The use of the auxiliaries contributes significantly to the monitoring of the drying process and, instead of an approximate evaluation, to obtain an accurate result. Even though the screed on the surface seems to be dry enough, this does not mean that the entire layer is ready to be covered! Various factors influence the drying process of the screed: The method of applying the screed, the material used, the season, the temperature and humidity in the room, the thickness of the screed layer or the number of layers (if necessary). Depending on was used for a material for the screed, and what was laid on it for a material, a so-called end floor, the optimal value for the residual moisture in the screed may be different. A concrete screed takes a lot of time to dry. Therefore, it should always be noted that this process must not be accelerated or slowed down intentionally. The production of a very dry room air accelerates the evaporation of the moisture, which was causing cracks in the screed. On the other hand, too high humidity will lead to additional wetness of the screed and to a considerable extension of the drying time. It is therefore important to create favorable conditions, because only in this way can proper drying of the screed be ensured (no drafts, no direct sunlight, no frost in the room, etc.). The most common problems caused by insufficient drying of the screed are: Odor nuisance, bubbles and waves on floor coverings, "rise" of the covering material, waves, loss of strength, mold formation, The flooring loses its adhesion to the screed, change of color of the coating material, etc. A moisture meter, which works with the calcium carbide method, considerably simplifies the control of the residual moisture in the screed. Depending on the estrichttyp, the most suitable measuring method can be selected. The calcium carbide method helps, for example, to precisely determine the residual feuche at any depth. On the other hand, this method takes more time and determines the moisture by weight. The handling of an electronic measuring device is very simple, was this allows every user to perform many measurements in a very short time, especially if the layer thickness is not very large. Regardless of the method chosen, the following main point must be observed: Correct determination of moisture in the screed is very important, and therefore a double check should be carried out for each screed application.

This text is machine translated.