The purchase of grain moisture analyzer and the matters needing attention The season when the grain is harvested, the detection of grain moisture is an indispensable item, and a good grain moisture analyzer is a great helper for grain harvesting. Now I will give you a brief introduction about grain. Moisture meter classification and purchase notes:
1, resistive moisture meter:
The resistive moisture meter is also used to be called a pin type moisture meter. Principle: Resistive principle, the current product on the market has a pin and two pins. The higher frequency of use in the general food industry is two pins. The working principle of this moisture analyzer is mainly to detect the moisture value through the size of the resistor. The tested sample is equivalent to a resistor. When the moisture value is high, the resistance is small, and when the moisture value is low, the resistance is large. The simpler one is Ohm's law: R = U/I (resistance is equal to voltage divided by current).
The advantages are: simple structure, easy to carry, fast detection, no need to process the measured sample, and the price is low.
Disadvantages: This type of product has no accuracy, the moisture range is limited, the test error is large, and each sample requires calibration. At the same time, it is more likely to be affected by temperature, environment, and contact area. The pin moisture meter products in the domestic market are also mixed and uneven, and these products can currently only serve as an auxiliary tool. The price is relatively cheap, ranging from tens to thousands of yuan (reference).
2, capacitive moisture meter:
Capacitive moisture analyzer is referred to as cup moisture analyzer and capacitive principle. When used, turn it first to make the sample uniform and detect the moisture through the capacitance. According to the principle of capacitance C=Q/U (the capacitance is equal to the power divided by the voltage) , Such moisture meter test moisture range is generally 14% -22%. Test different samples, need to use the oven to calibrate one by one, (that is, use the oven to make the standard moisture, and then adjust the moisture meter parameters to correspond with the oven phase value).
Advantages: Capacitance moisture meter test is simple, fast, cereal samples do not need to be crushed, can display the data after the decimal point.
Disadvantages: easily affected by temperature and uniformity, when the temperature is 0 °C shows that the water value is essentially zero, the same sample uniformity is not the same as the water value is not the same, the test of the food with more than 22% moisture, the error is large, basic There is no repeatability. And when the temperature needs more than 10°C, the data can reach certain repeatability. The current market price is generally around 500-2000 yuan (reference).
Currently, 80% of the pin moisture meter and capacitor moisture meter are used in the grain purchasing industry, and other industries use very little. Although they are only auxiliary tools, the difference is that the needle moisture meter is inserted into the measured object during the pin moisture meter test process. In vivo, the measured results are strongly influenced by the intensity. Capacitance moisture meter is to pour the measured sample directly into the instrument and finally get the moisture value. (In view of the unstable price of domestic food, most grain companies gradually abandoned such moisture meters and switched to halogen moisture analyzers in the past two years.)
3, infrared moisture meter:
Infrared fast moisture meter, designed with thermogravimetric principle, is a rapid moisture detection instrument. It was first developed by Shenzhen Guanya Electronics. Moisture analyzer measures the weight of the sample, while the infrared heating unit and the moisture evaporation channel quickly dry the sample. During the drying process, the moisture analyzer continuously measures and immediately displays the lost moisture content of the sample. After the drying process is completed, the final moisture content is determined. The value is locked for display. Compared with the international oven heating method, infrared heating can reach the maximum heating power in the shortest time, and the sample is quickly dried at high temperature. The detection results are in good agreement with the national standard oven method, and it is replaceable, and the detection efficiency is much higher. In the oven method. General samples take only a few minutes to complete the measurement. And the operation is simple, the test is accurate, and the display part adopts the red digital tube, which can display the data of water content, initial value, final value, measurement time, initial temperature, final value, etc., which are clearly visible. And has a connection with the computer, printer. This kind of moisture meter generally needs to adjust the temperature to achieve the same precision as the oven. The general error is 0.2% smaller than the national standard 0.5%.
1, resistive moisture meter:
The resistive moisture meter is also used to be called a pin type moisture meter. Principle: Resistive principle, the current product on the market has a pin and two pins. The higher frequency of use in the general food industry is two pins. The working principle of this moisture analyzer is mainly to detect the moisture value through the size of the resistor. The tested sample is equivalent to a resistor. When the moisture value is high, the resistance is small, and when the moisture value is low, the resistance is large. The simpler one is Ohm's law: R = U/I (resistance is equal to voltage divided by current).
The advantages are: simple structure, easy to carry, fast detection, no need to process the measured sample, and the price is low.
Disadvantages: This type of product has no accuracy, the moisture range is limited, the test error is large, and each sample requires calibration. At the same time, it is more likely to be affected by temperature, environment, and contact area. The pin moisture meter products in the domestic market are also mixed and uneven, and these products can currently only serve as an auxiliary tool. The price is relatively cheap, ranging from tens to thousands of yuan (reference).
2, capacitive moisture meter:
Capacitive moisture analyzer is referred to as cup moisture analyzer and capacitive principle. When used, turn it first to make the sample uniform and detect the moisture through the capacitance. According to the principle of capacitance C=Q/U (the capacitance is equal to the power divided by the voltage) , Such moisture meter test moisture range is generally 14% -22%. Test different samples, need to use the oven to calibrate one by one, (that is, use the oven to make the standard moisture, and then adjust the moisture meter parameters to correspond with the oven phase value).
Advantages: Capacitance moisture meter test is simple, fast, cereal samples do not need to be crushed, can display the data after the decimal point.
Disadvantages: easily affected by temperature and uniformity, when the temperature is 0 °C shows that the water value is essentially zero, the same sample uniformity is not the same as the water value is not the same, the test of the food with more than 22% moisture, the error is large, basic There is no repeatability. And when the temperature needs more than 10°C, the data can reach certain repeatability. The current market price is generally around 500-2000 yuan (reference).
Currently, 80% of the pin moisture meter and capacitor moisture meter are used in the grain purchasing industry, and other industries use very little. Although they are only auxiliary tools, the difference is that the needle moisture meter is inserted into the measured object during the pin moisture meter test process. In vivo, the measured results are strongly influenced by the intensity. Capacitance moisture meter is to pour the measured sample directly into the instrument and finally get the moisture value. (In view of the unstable price of domestic food, most grain companies gradually abandoned such moisture meters and switched to halogen moisture analyzers in the past two years.)
3, infrared moisture meter:
Infrared fast moisture meter, designed with thermogravimetric principle, is a rapid moisture detection instrument. It was first developed by Shenzhen Guanya Electronics. Moisture analyzer measures the weight of the sample, while the infrared heating unit and the moisture evaporation channel quickly dry the sample. During the drying process, the moisture analyzer continuously measures and immediately displays the lost moisture content of the sample. After the drying process is completed, the final moisture content is determined. The value is locked for display. Compared with the international oven heating method, infrared heating can reach the maximum heating power in the shortest time, and the sample is quickly dried at high temperature. The detection results are in good agreement with the national standard oven method, and it is replaceable, and the detection efficiency is much higher. In the oven method. General samples take only a few minutes to complete the measurement. And the operation is simple, the test is accurate, and the display part adopts the red digital tube, which can display the data of water content, initial value, final value, measurement time, initial temperature, final value, etc., which are clearly visible. And has a connection with the computer, printer. This kind of moisture meter generally needs to adjust the temperature to achieve the same precision as the oven. The general error is 0.2% smaller than the national standard 0.5%.
POLESTAR Machinery Has More Than 10 Years of Experience in Producing Plastic Crushing Machines. The Plastic Crusher We Produce Can Be Used in Injection Molding, Blow Plastics, Extrusion, Granulation and Other Production Fields. It Has A Wide Range Of Uses And Can Also Be Customized According To Your Crushing Material Needs, Carry Out Customized Production
Plastic Crusher,plastic crushing machine
Zhangjiagang Polestar Machinery Co.,Ltd , https://www.polestarplast.com