Five Techniques for Measuring Cotton Moisture Content
Tip # 1: Use a hygrometer
When harvesting dozens of acres of cotton (or more), manual detection methods for checking cotton% MC are impractical. Simple touch testing cannot provide quantifiable measurement of cotton moisture content.
The oven drying test, if completed correctly, is highly accurate and takes too long to complete, in order to measure the moisture in the cotton in a timely manner for harvesting or ginning. When you obtain a measurement result from enough cotton samples that you are well aware of the moisture content of cotton, the remaining cotton may have already seen a significant change in% MC!
Moisture meter cotton, on the other hand, can provide reliable measurements of the moisture content of your cotton in seconds rather than hours.
Tip # 2: When to measure moisture
In general, the important moment to measure the moisture content of cotton is at harvest and during the ginning process again. You can also check the moisture content of the cotton before selling it to indicate how much of its weight comes from moisture.
Before passing cotton through gin, checking for moisture can ensure high-quality long fibers by letting you know if the cotton needs to be dry or moist. Checking the moisture content during the sales process can let your buyer know that they are receiving a fair market price and will not be charged for excessive water content.
Tip # 3: Choose the appropriate electrode for the job
At different stages of cotton harvest, cotton has many different forms. From cotton wool and seed cotton to large, fluffy white cotton bags, it is important to have measuring equipment suitable for this type of work.
When you need to test the moisture in cotton wool or seed cotton, a small cup electrode (such as 52-E/C electrode) may be a better electrode type to use. Using this electrode, you simply place a cotton sample into a cup, press it firmly with your fingers (even if the sample still overflows from the cup afterwards), and then press the reading button on the moisture meter.
It is important to remember that testing seed cotton may not be as accurate as testing cotton wool. This is because the seeds present in cotton may have a higher moisture content than cotton lint, and the randomness of the number of seeds in any given sample.
To test the cotton bag, you need to use an extended electrode to penetrate the inside of the bag to test for moisture. The 30-E/C electrode is very suitable for this purpose because it has two insulated pins that are 24 centimeters (9 1/2 inches) long. The insulation material on the pins allows them to penetrate the deepest part of the bundle and provide you with humidity readings at a specific depth, rather than the surface humidity on the bundle.
In particularly tightly packed bundles, a heavy-duty electrode made of steel bars may be required to penetrate the bundle to obtain readings.
In order to measure cotton that has already been processed into yarn, shorter electrodes with multiple contact points (such as 37-E/C) are more suitable for obtaining reliable readings.
Tip # 4: Satisfactory Cotton Moisture
According to information cited by the US Department of Agriculture, when measuring the moisture content of cotton before ginning, the average moisture content of cotton is between 6.5% and 8%. When at this% MC, the quality of the yarn processed from cotton will be higher than when the moisture content of cotton significantly decreases.
Cotton that is wetter than 8% MC can easily stick to the machine, causing blockages that hinder production and even damage expensive equipment.
Prompt # 5: Check the calibration of the instrument
Proper maintenance and upkeep, carefully crafted hygrometers from reliable manufacturers are tools that you can trust for many years. However, it is still important to regularly check the calibration of the instrument to ensure that you obtain accurate results.
There are several methods to check instrument calibration, including:
Use reference gauges. Take an unused instrument and compare the humidity readings between two cotton samples.
Use Moisture Content Standard (MCS). These convenient small devices allow you to test the accuracy of the instrument by providing consistent resistance values. If the result returned by the instrument is not the value of MCS, you will know that the calibration of the instrument has been turned off.
Use built-in calibration check. Some humidity meters, such as Delmhurst's C-2000 instrument, have built-in calibration checks. By pressing the button, the instrument can run a check and you will immediately know if it is working properly.
