The workings of a wood moisture meter and its calibration procedure
1. Principle of wood moisture tester:
Using microwave measurement technology, the moisture can be determined within 1 second, and the accuracy of the measurement results is high, not affected by particles, colors and any minerals contained in the product. It is made by using the principle that microwave energy is attenuated by being absorbed when passing through a substance. It can be used to measure the moisture of coal powder, petroleum or various crops; check the humidity of the grain depot; and the determination of the moisture of wood is determined by the principle of resistance, and it takes a considerable time before the wood is dry. During construction, wood that has been processed and dried insufficiently will deform later and cause cracks. Judging from the use examples of historical buildings, hundreds of years of service life have proved that if construction methods and management are ignored, no wood can be an excellent material. In order to be suitable for the high-temperature and humid climate like our country, the humidity of wood changes with the environment, so it is considered as living wood. Moisture management is necessary even if the correct application of wood does not revive it.
2. Calibration method of wood moisture tester
①Wood preparation: Take ten varieties of wood to be tested.
②According to the instrument used, refer to the instructions of the corresponding type of wood moisture tester, and measure the moisture of various woods according to the regulations.
③ Fill in the measured data into the instrument moisture column in the moisture detector calibration table.
④Divide each tested wood into two parts, and use the balance oven method to measure the moisture content.
3. Current development
Technical level: Compared with the traditional drying weight loss method to measure moisture, microwave moisture measurement has the advantages of fast, non-contact, and no damage to samples. There are density and temperature compensation measuring devices in the instrument, which can correct the inaccurate measurement results caused by changes in layer thickness and material density. For example, when the load on the belt changes and the density of the material in the conveyor belt changes, corresponding compensation measurements are required. The whole instrument is controlled by microcomputer, which has the characteristics of automation and intelligence.
Prospect of industrialization: This product has been filed with Heilongjiang Technical Supervision Bureau, and local technical standards have been established. Can be produced and sold directly.
Application fields: chemical industry, building materials, wood, manufacturing
