Differences between Pin and Pinless plywood Moisture Meters
Wood moisture tester
Wood moisture analyzer can be divided into pin-type wood moisture analyzer and inductive wood moisture analyzer.
2 pin type
Wood moisture meter can be divided into needle type wood moisture meter and inductive wood moisture meter.
Plug-in wood moisture meter includes a diode display wood moisture meter and a digital display wood moisture meter.
The inductive wood moisture meter includes an external sensor wood moisture meter and an internal sensor wood moisture meter. The built-in sensor wood moisture meter can also be divided into digital built-in sensor wood moisture meter and pointer built-in sensor wood moisture meter.
Plug-in Wood Moisture Meter
Also known as: moisture meter, moisture meter, humidity meter, moisture meter, digital wood moisture meter is the latest generation of wood moisture tester in the category of wood moisture tester. The instrument uses the most advanced core technology of single chip computer chip at present. The test data is more accurate, easy to operate, intuitive reading, and has seven grades of correction. It makes the determination of water value more accurate. The instrument is compact in shape, beautiful in appearance and easy to carry. It is suitable for rapid determination of moisture in various kinds of wood.
Performance and Technical Indicators of Plug-in Moisture Meter
1. Measuring range of moisture: 3-40%
2. Resolution: 0.1% (< 10%).
3. Measured Value Correction Gear: 7 Gears
4: Display mode: red LED digital tube
5: Size: 130X65X25 mm
6: Use ambient temperature: – 10 – 40 C
7: Whole machine weight: 0.125 kg
8: DC power supply: 6F22 9V battery 1 Section
Operating Method of Plug-in Moisture Detector
1. Gear setting method: first press SPECIES, then press TEST, then display the current gear value, press the setting key continuously, can change the gear continuously until the required gear.
2. Pre-test: Set the cap to 5 gear according to the above method, then pull off the cap, contact the probe on the cap with the two contacts, press the test key, if the display is 18 + 1, the instrument is normal.
3 determination: insert the probe on the instrument into the wood sample to be determined. Press the test key, the instrument shows the average absolute moisture content of the sample, the sample shows 3.0 when the moisture content is less than 3, the sample shows 40 when the moisture content is more than 40, indicating that it has exceeded the range.
Notes for Plug-in Wood Moisture Measuring Instrument
1. When using the instrument for the first time, according to the experience range value of wood moisture, the gear determination can be changed, which gear error is small, and the later determination is in this gear.
2. If the moisture content of the wood to be measured is unknown, the gear can be determined according to the following methods:
Firstly, the wood samples with average moisture content were taken and the moisture content was determined by instrument 1-7.
The measured values of each file were recorded. Samples are then sent to the oven and determined by oven drying method.
Moisture content. Then compared with the average values of 7 groups, which gear is close to the measured value, and later determined.
Fixed in this gear. If the above measurement is carried out unconditionally, it is usually recommended that the measurement be carried out on the 5th gear. However, attention should be paid to the measurement error caused by this.
Pinless plywood Moisture Meters
The instrument uses Harris LSI technology to ensure high sensitivity and accuracy of wood moisture measurement. Even a slight change in water content can be reflected by the instrument. Therefore, it is a wood moisture measuring instrument with high accuracy.
In order to adapt to the measurement of wood with different densities, 6 kinds of tree selection switches are set on the top of the measuring instrument. Please adjust according to the following gear.
When using, please put the bottom of the instrument flat on the tested wood, the surface of the wood must be flat, or there will be measurement error.
If the moisture content of the tested wood is not uniform, several more points can be measured in the measurement, and then the average value can be calculated to obtain the average moisture content.
Parameters of Inductive Wood Moisture Meter
1. Measurement range: 0-99%
2. Resolution: 0.1% (accurate to one decimal point)
3. Display: LCD liquid crystal display (digital display)
4. Tree species revision: 1-6 files
Also you can see from https://www.wagnermeters.com/moisture-meters/wood-info/pin-pinless-meter-differences/ to find out more their difference .
Pin-style meters usually have two metal pins that must physically penetrate the wood’s surface in order to take a moisture reading. Pinless meters use a sensor pad that works in contact with the wood surface but does not physically break or damage the surface to take a reading. Let’s look at why that matters.
Sensor Size vs. Pinpoint Accuracy
Orion 930 on light woodThe true difference rests in the underlying technology of each type of meter. Pin meters work on a resistance principle that measures the flow of electricity between two pin tips and measures the moisture content (MC) of that very tiny path. Keep in mind that pin meters only measure the MC at the point in the wood between the two pins. Multiple readings are always necessary to get an overview of the MC. Pinless moisture meters use a larger sensor pad and emit electromagnetic signals to measure the MC of wood. This provides the unique ability to quickly and accurately “scan” larger areas in each wood piece, providing instant MC readings. This technology can scan many board feet in seconds without the time-consuming effort of driving pins into the wood.
Holes vs. No Holes
As we’ve already mentioned, a pin meter will penetrate the wood’s surface to measure the MC. Therefore, each MC reading will make a pair of holes in the wood. For 2x4s or firewood, this might not be a problem. For wood flooring, fine furniture, cabinets or other fine woodworking projects, those holes become a series of blemishes in the surface of the wood. Pinless meters leave no damage to the surface.
Fixed-Depth Readings vs. Variable-Depth Readings
Pinless moisture meters generally operate at two standard reading depths: ¼” below the wood surface, and ¾” below the surface. For most woodworking projects, like wood flooring or cabinetry, these depths provide the necessary MC readings required. Because pin meters take readings between the two pins, they offer slightly more variability in reading depths. The MC reading will always be taken at the depth the pins are driven into the wood. (Of course, this also means that if the pins are not inserted properly, the MC reading may not be accurate.) Pins are generally replaceable and can be purchased in different lengths, or the meter itself can be attached to external hammer probes for deeper MC depth readings.