Technical Description Of Wet Bulb Wick -
It is a tubular cotton braid made on standard braiders. Used on
psychrometers and hygrometers. Diameters generally range from
1/4 to 1/2
braid lays flat and that is how a diameter is determined. The most important part of the process is to rinse the braid in a
hot water and
bleach | chlorine solution to remove the cotton oils from the
braid. This makes the cotton water absorbent. Some manufacturers add an optical
brightener for cosmetic | marketing reasons. A simple test is to
cut a piece of the treated wick and drop it into a cup of hot water. If the cotton
oils have been removed from the braid by the simple wash described above then the wick will drop immediately to the
bottom of the cup.
Wet Bulb Wick
Purpose- Fits over the end a thermometer bulb. Usually
the wick is sold on spools, but may be stored in bulk in boxes.
Just cut off a piece about 2 inches long and slide it over one of the
thermometer bulbs. Then wet it with water. Hence the term "Wet" and "Dry" bulb.
Wet and Dry Bulb
Hygrometer - Hygrometers measure the moisture content
(humidity) in the environment, either as the percentage of
moisture in the air or the amount of moisture in the air.
Hygrometers are used in laboratories, but mainly in the poultry
business at hatcheries where regulating the humidity is key to
production success. Sling Psychrometer
- Take humidity readings by comparing the reading of the wet and
dry bulb thermometers on standard humidity chart.
Listings are provided as an
aid to those interested in Wet Bulb Wicking as it relates to the
poultry hatchery | incubator industry . No warranties or
guaranties are expressed or implied. Those listed do not
necessarily endorse Wet BulbWick - This site is informational.
Content subject to change. Contact
Sources - Sourcing wet bulb wick in China would be
reaching out to textile manufacturers that make tubular braided
cotton cording. The way to measure the braid is to lay it flat.
Popular sizes are 1/16, 1/8, 3/16, 1/4, and 3/8 inches (layed
flat). The next
step is to have the wicking double rinsed in a bath of hot water ~ 190
degrees Fahrenheit with a mild solution of chlorine | bleach.
Simple as that !! See
Alibaba Search -
Alibaba.com with keyword
"tubular cotton braids" for starters. Alibaba has been around
for over 10 years. They are a reputable Chinese manufacturing
portal. Yahoo (as of 2015) actually has a stake in this venture. Their
purpose is to facilitate business direct with companies and
consumers in the US and around the world.
Bulk Tubular Wicking - Qingdao Hui Li Yuan Webbing Co.,
Ltd. is a comprehensive manufacturing company in China.
- Fluid wick is a natural tubular cotton braid usually 1/2 in
diameter used again in the hatchery | incubator industry at major
poultry producers. It is used to draw water into incubators.
Again the concept is simple. A thick braid that has been double rinsed
in a chlorine | bleach solution. See
and Dry Bulb Thermometers) - A psychrometer consists of
two thermometers, one which is dry and one which is kept moist
with distilled water on a sock or wick. The two thermometers are
thus called the dry-bulb and the wet-bulb. At temperatures above
the freezing point of water, evaporation of water from the wick
lowers the temperature, so that the wet-bulb thermometer usually
shows a lower temperature than that of the dry-bulb thermometer.
When the air temperature is below freezing, however, the
wet-bulb is covered with a thin coating of ice and may be warmer
than the dry bulb.
Wet Bulb Wick is a commonly
used product in the hatchery business for breeding chickens. The
humidity levels must be within very specific ranges. The tools
used to determine humidity are simple in use. They are
psychrometers and hygrometers. Each of these devices has two
thermometers one of which a tubular wick is slid over and
How to Determine
Relative Humidity From a Wet & Dry Bulb Thermometer -
Relative humidity shows how much moisture the air could hold
compared to how much it does hold.
Wet bulb wicking
may also be used on thermocouples used in the HVAC industry.
After all the purpose is to keep something wet in relation to
something dry for comparisons. Cotton has always been the
material of choice, but today there are materials that wick
better than cotton such as polypropylene.