In this type, there are two thermometers, one a dry bulb and one a wet bulb. The relative humidity of a humidor is determined using a psychometric chart. Temperatures are taken from both the wet- and dry bulb thermometers, and where those temperatures intersect on the psychometric chart equals the relative humidity.
The extra steps required to determine this figure prevents psychrometers from becoming a popular hygrometric option for humidors. Of course, using any type of hygrometer to measure and track the relative humidity of stored cigars is an improvement over no method at all.
However, these analog devices have a number of drawbacks that cannot be ignored. Because they were the original type of hygrometer, analog devices have earned a reputation for being rather poorly manufactured with cheap and unstable mechanisms. However, the main issue with these hygrometers, which led to the development of a digital version, is the need for routine tune-ups and resets throughout the lifespan of these instruments.
Because the springs are wound tightly and the entire system of hardware involves tiny moving parts, the accuracy of this hygrometer can often be affected. The more time that passes between adjustments, the more inaccurate this type of hygrometer becomes. At times, the gauge readings can be off by up to 25 percent, a figure that can drastically affect the moisture and taste of any stored cigars.
Since the enjoyment of cigars is based largely on their storage conditions, this percentage can ruin an otherwise perfect cigar. Because this type is more attractive and most likely to be sold with a new humidor, many cigar smokers continue to use these hygrometers.
Luckily, these analog devices can be sustained through frequent and thorough maintenance. Re-calibration is not overly difficult or time-consuming, but it can require the expertise of a specialist, and this can be an added cost to the cigar smoking hobby.
For those cigar smokers who would prefer to maintain their own hygrometers, manufacturers have created a number of methods for measuring the accuracy of these devices. First of all, most producers have tightened hygrometer calibrations at the factory before the devices are shipped.
Furthermore, these manufacturers have developed a wide range of easy-to-use products that allow avid smokers to test and calibrate their hygrometers at home. The need for any cigar smoker to have a hygrometer is pretty clear. Resistive electrical hygrometers have electricity passing through a ceramic substance that is in the air. When the humidity gets high, more water vapor causes the ceramic to contract, which leads to a modified resistance. Meanwhile, a capacitive electrical hygrometer uses two plates with air between them.
The amount of humidity is measured through the ability of these metal plates in storing electrical charges, which moisture affects directly. These devices are for measuring the saturation of moisture in a gas. Typically, they are used in places with the least amount of humidity can be found. Currently, they are considered the most precise type of hygrometers. Hygrometers have become a popular device in industrial spaces and greenhouses.
These days, however, they are also used in museums, humidors, saunas, and incubators. Moisture can harm wooden musical instruments, which is why hygrometers are also used in caring for pianos, violins, harps, and guitars among others. Meanwhile, homes can benefit from hygrometers because they can guide the residents on humidity control. Very low humidity can negatively impact the skin and the body. On the other hand, too high humidity encourages mildew and dust mites to proliferate. With the help of hygrometers, homeowners can figure out a way to control moisture in their surroundings.
The paint industry also sees the importance of hygrometers. Paint applications, for instance, can be quite sensitive to both dew point and humidity. Whether you will use a hygrometer for weather observation or measuring conditions for indoor spaces, it makes sense to know how to read one. To get the best and most accurate results, these devices need to be calibrated at least once every year.
Relative humidity is computed by comparing the numbers in a calculation table, which matches the ambient temperature in a wet and dry bulb psychrometers, it is the dry bulb with the difference in the temperatures given by the two thermometers.
Reading the hygrometer is not tricky, but it may vary depending on the type and model you are using. For instance, a wet and dry bulb requires the following numbers:. To read the result, look at the chart that is on the face of the device and read down starting from the wet bulb depression and then the temperature of the dry bulb.
Get the spot where the numbers meet, and you will have the relative humidity of the area. Use percentage to express the final answer. For digital hygrometers, you will only have to place the instrument at about 3.
Let the device work for at least three minutes so it can adequately detect the temperature of the air. You do not have to perform any other calculations because the instrument will do it for you. An example of a digital hygrometer is ThermoPro TP63 , which is suitable for both indoor and outdoor use. The device can monitor the conditions of the environment in four different locations of up to feet 60 meters away, making it suitable for greenhouses.
But when atmosphere is humid having higher humidity, the evaporation of water from wet bulb remains low resulting the less decrease in the wet bulb temperature. At percent humidity the temperature of dry and wet bulb will be same due to no water evaporation from the wet bulb hence no cooling effect occurs. Relative humidity is determined by the difference of the temperatures of dry bulb thermometer and wet bulb thermometer. Always water is used in hygrometers. But when we use oil in wet bulb having no evaporation, the temperature of both bulbs remain same due to no cooling effect.
Hygrometers are always used in pharmaceutical manufacturing because a lot of pharmaceutical ingredients are hygroscopic and high humidity may cause problems in formulation of those compounds. Hard gelatin capsules and other hygroscopic ingredients are stored at low humidity storage conditions. Relative humidity is determined using the following table. Pin it. Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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