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with this procedure. For one thing, moisture meters aren’t accurate with wet lumber. Another consideration is that the moisture content won’t be symmetrical across the width of the board at the edge of the stack of lumber due to the different drying conditions on the two edges–the side of the lumber exposed to the wind, sun and rain will dry differently from the opposite edge. Erroneous readings can easily result. About all that you could reliably determine is that you will get “snake bites” along the board edges from the meter pins. Don’t use resistance meters during a dry kiln run. Resistance meters will read inaccurately unless temperature corrections are applied conscientiously, and it’s very important to make corrections according to the manufacturer’s recommendations. Boards often dry nonuniformly because of grain or density differences or the presence of knots. It’s always a safer and more certain practice to avoid using moisture meters to monitor lumber drying. Use sample boards. Dielectric meters require careful application as well. I visited a fellow one day who used his dielectric moisture meter as his sole means of tracking the drying progress of lumber in his kilns. He’d been having some problems, and he asked me why he was getting different readings with the meter oriented parallel to the grain and perpendicular to the grain. The answer was pretty obvious once I took a look at his lumber. It turned out that the lumber he was working with was slightly cupped, and the amount of contact between the wood and the sensor plate differed depending on the meter orientation. I took the photos in Figures 46–48 using one of my own meters on one of his sample boards (after it had been sitting in my office for a month or so, which is one reason the meter readings are so low): Figure 46. Different readings with a dielectric moisture meter on the same (cupped) board. The meter is parallel to the grain in the left-hand photo and turned at 90° to the grain in the right-hand photograph. 83PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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