#psychrometer

[vegabazaar]

R-Tek Digital Psychrometer RT931 Buy : https://vegabazaar.com/product/RTek-Digital-Psychrometer-RT931/ #vegabazaar #vegacalibrations #psychrometer #industry #industrial

[buzzlift]

5 Modern Instruments Used to Measure Humidity

Explore the world of humidity measurement with the latest instruments! Learn about hygrometers, digital hygrometers, and maintenance tips. Discover the cutting-edge technology behind weather instruments for accurate humidity readings.

[mcclellancholy]

hi world,

I'm still thinking about Forest the piglet I met a few weeks ago. I felt kinship with him since he too was abandoned by his birth momma.

my life has been crumbling a bit lately, like cookies that are almost perfectly soft & gooey but not quite ready to be eaten. school is hard and I already dropped a class this semester. my boyfriend is amazing and so kind and cute and I do love him. my dog and I have been walking more and I am joining a nature therapy club and I will be playing in the dirt more frequently and that's probably a good thing.

I am going to the Mayo Clinic on fucking SUNDAY and I am absolutely wrecked with anxiety but hopeful for an end to my chronic undiagnosed illness. I will turn twenty-eight in MN, so hopefully the snow will baptize me with youthfulness or something. I mostly just want to lay down in a big pile of snow and listen to Coldplay or Radiohead or something and forget about everything for a while.

my aunt's funeral is Saturday and I am so sad. Her legacy, though, is so bright and I am doing my best to be the best student teacher and carry her force with me.

I just ate a weed gummy and I have done my homework and eaten a salad and creek-hopped with pup and taught some HS kids about sling psychrometers and atmospheric moisture measures and it was a pretty good day.

so good, in fact, that I might wear a dress tomorrow to keep this feeling going.

I am going to snuggle my creatures now and maybe I will blast into an alternate reality where everything is ok and life smells like fresh bread and lemongrass.

sweet dreams tumblr kiddos

[acadoll]

Lab was even smoother today. I’m feeling really good about instructing my students and answering questions on this one. Using the sling psychrometers and explaining how they work to determine relative humidity can be a little bit of a hard task, but I feel like the students I talked to about it really understood. Good (albeit long) day!

10.17.23 — posted late

[tearsinthemist]

Psychrometer

[homeweatherstation]

How Weather Instruments Work: The Science Behind Forecasting

Weather instruments play a crucial role in collecting data that meteorologists use to forecast weather conditions. Understanding how these instruments work provides insight into the science of weather forecasting and helps appreciate the complexity of predicting atmospheric changes. Here’s a detailed look at some of the essential weather instruments and their functions.

1. Thermometers

Function: Measure air temperature.

How They Work:

Mercury Thermometers: Use mercury in a glass tube; as the temperature rises, the mercury expands and moves up the tube, indicating the temperature.

Digital Thermometers: Use electronic sensors to measure temperature changes and display the readings digitally.

Alcohol Thermometers: Similar to mercury thermometers but use alcohol, which expands and contracts with temperature changes.

2. Barometers

Function: Measure atmospheric pressure.

How They Work:

Mercury Barometers: Consist of a glass tube filled with mercury. As atmospheric pressure increases, it pushes the mercury up the tube, and as pressure decreases, the mercury level drops.

Aneroid Barometers: Use a small, flexible metal box called an aneroid cell. Changes in atmospheric pressure cause the cell to expand or contract, moving a needle on a dial to indicate pressure changes.

3. Hygrometers

Function: Measure humidity levels in the air.

How They Work:

Mechanical Hygrometers: Use materials like hair or synthetic fibers that expand and contract with humidity changes, moving a needle on a dial.

Digital Hygrometers: Use electronic sensors to detect humidity levels and display the readings digitally.

Psychrometers: Use two thermometers (a wet bulb and a dry bulb). The difference in readings between the two thermometers, caused by evaporation cooling the wet bulb, helps calculate humidity.

4. Anemometers

Function: Measure wind speed.

How They Work:

Cup Anemometers: Have three or four cups attached to horizontal arms. As the wind blows, it spins the cups, and the rotational speed is used to calculate wind speed.

Vane Anemometers: Combine a wind vane to show wind direction and a propeller or rotating cups to measure wind speed.

Hot-Wire Anemometers: Measure wind speed based on the cooling effect of air flowing past a heated wire.

5. Rain Gauges

Function: Measure the amount of rainfall.

How They Work:

Standard Rain Gauges: Consist of a funnel that directs rain into a graduated cylinder, where the amount of collected water is measured.

Tipping Bucket Rain Gauges: Have a small bucket that tips and empties after collecting a specific amount of rain, recording each tip electronically.

Weighing Rain Gauges: Measure the weight of collected rainwater, which is then converted into a rainfall measurement.

6. Weather Vanes

Function: Indicate wind direction.

How They Work:

Design: Typically consist of an arrow or pointer that rotates on a vertical rod. The arrow aligns with the wind direction, pointing to where the wind is coming from.

7. Weather Satellites

Function: Monitor large-scale weather patterns from space.

How They Work:

Imaging Satellites: Use cameras and sensors to capture images of cloud cover, storms, and other weather phenomena.

Geostationary Satellites: Remain fixed over a specific location, providing continuous monitoring of weather conditions.

Polar-Orbiting Satellites: Orbit the Earth from pole to pole, providing global coverage and detailed images of weather systems.

8. Radiosondes

Function: Measure atmospheric parameters at various altitudes.

How They Work:

Design: Attached to weather balloons, radiosondes carry instruments that measure temperature, humidity, and pressure as they ascend through the atmosphere. The data is transmitted back to ground stations for analysis.

The Science Behind Forecasting

Meteorologists use data collected from these instruments to understand current weather conditions and predict future weather patterns. The data is fed into computer models that simulate the atmosphere's behavior based on physical laws and historical data. These models help forecasters make predictions about temperature, precipitation, wind, and other weather phenomena.

Data Collection: Instruments collect real-time data on various atmospheric conditions.

Analysis: Meteorologists analyze the data to identify trends and patterns.

Modeling: Computer models use the data to simulate weather conditions and make forecasts.

Prediction: Based on model outputs and expert analysis, meteorologists predict upcoming weather.

By integrating data from multiple sources and utilizing advanced technology, weather forecasting has become increasingly accurate, helping individuals and communities prepare for and respond to weather events effectively.

[history-today]

Today In History:

A bit of December 3rd history…

1586 - Sir Thomas Herriot introduces potatoes to England from Columbia

1736 - Astronomer Anders Celsius takes measurements that confirm Newton’s theory that the Earth was an ellipsoid rather than the previously accepted sphere

1775 - 1st official US flag raised (Grand Union Flag) aboard USS Alfred

1854 - Eureka Stockade: in what is claimed by many to be the birth of Australian democracy, more than 20 goldminers at Victoria are killed by state troopers in an uprising over mining licenses

1868 - 1st blacks on US trial jury appointed for Jefferson Davis trial

1911 - Willis Carrier presents his influential “Rational Psychrometic Formulae” on air conditioning to the American Society of Mechanical Engineers

1984 - “Do They Know It’s Christmas” single by Band Aid is released in the UK (pictured)

1989 - Soviet President Mikhail Gorbachev and US President George HW Bush declare the Cold War over

2018 - 7 yr old Ryan of Ryan Toysreview is the years highest paid Youtube star earning $22 million 

[vegabazaar]

R-Tek 0 to 50°C Mercury Sling Psychrometer RT-078 Brand : R-tek Model : RT-078 Temperature Range : 0 to 50°C Application : Industrial Indication : Mercury Easy-To-Use : Quickly & Accurately Measure Humidity Levels. Buy : https://vegabazaar.com/product/RTek-0-to-50C-Mercury-Sling-Psychrometer-RT078/

[dr-dana]

How to Decide on the Right Size of a Cooling Tower

While cooling towers are used for industrial purposes, they have been used for residential AC systems and multi-building manufacturing units. They help you maintain heat and temperature for your HVAC systems.

Based on the use cases, cooling tower sizes are different, as they vary depending on where you want to use them. That is why when installing a cooling tower, you must decide on the right size and consider quality material.  

When it comes to choosing the right size, certain factors need to be considered. Having the right-sized tower makes the system more efficient. On the other hand, if you don’t have a cooling tower of the right size, it may cause many issues in the future. 

Moreover, you can consider the below points to learn more about choosing the rightly sized cooling tower. 

Wet bulb temperature

WBT or wet bulb temperature is impacted by ambient air temperature and relative humidity. It measures the amount of water vapor the atmosphere holds. If you want to measure WBT, you will need a tool called a psychrometer. In order to use the tool, you have to place water on it, and after a while, you will know the temperature difference. 

Moreover, by knowing the correct WBT, you are able to assess the size of the tower you need for your commercial or residential facility.   

Approach 

When deciding on the cooling tower sizes, you will need to figure out the “approach” after knowing WBT. When you find it, you are required to see the difference between the WBT and cold water temperature. You will need to install large cooling towers if you receive a lower approach temperature. 

Many cooling tower manufacturers recommend that the approach should be between 5 and 10 degrees Fahrenheit for their cooling towers. 

Range of cooling 

It is one of the quickest processes to be done when it comes to cooling tower sizes. The range of cooling is nothing but the difference between the water temperature that exits machinery and the cold water temperature. 

Heat load 

Do you know what a heat load is? Well, you can use the range of cooling to find out the load of the tower. You can follow a particular formula to calculate the heat load. If you don’t know the formula, call a professional, as they will do the required things to determine the heat load. 

Other factors that impact cooling tower size   

After knowing all the above factors that help you decide the right cooling tower size, you may still be unable to do it. This is because other factors influence the result, including the chemical use of the tower. 

Conclusion 

This is what you need to know about the cooling tower sizes. You can follow the above ways to decide on the right cooling tower size.  It will be good to call a cooling tower installation company and let them decide on the size. A professional has the right tools and resources so they can do it more effectively than you. Cooling Tower Systems is here to help you with the same. Visit our website to learn more.

[heatsensors]

What Is A Hygrometer, The Way It Works, & Its Different Types?

A hygrometer is an important tool for most manufacturing industries as it helps to measure the amount of moisture in the air. It is used in a variety of industries and processes where accurate humidity measurements are critical. What more?

Read our article to know more.

Looking to purchase high quality Hygrometers?

Call Heatcon on +91 9844233244 to start a discussion and place your order. Heatcon Sensors have been manufacturing temperature measurement devices, temperature producing equipment, and accessories for the same for more than 30 years.

[elvisomar]

Margaret Ingels

(1892–1971) Mechanical engineer

In 1920, Margaret Ingels became the first woman to earn a professional degree as a Mechanical Engineer. She worked for most of her career at Carrier-Lyle—the heating and air conditioning giant. Working in their labs, she helped develop the Anderson-Armspach dust determinator, which became the industry standard for air filtration, and she invented the sling psychrometer, which measures air humidity and is still widely used today.

Number 207 in an ongoing series celebrating remarkable women in science, technology, engineering, and mathematics.

[tearsinthemist]

DETERMINING THE DEW POINT WITH A SLING PSYCHROMETER

GENERAL

This test method describes how to determine the dew point using a sling psychrometer. A

psychrometer measures the ambient air temperature (dry bulb temperature) and the wet bulb

temperature. From the dry bulb and wet bulb temperature the dew point is calculated. The dew

point is the temperature at which moisture in the air will start condensing.

When painting structural steel, specifications may require the dew point to be measured. This is to

ensure that no moisture is condensed on the surface to be painted.

APPARATUS

1. Sling psychrometer

2. Replacement thermometer

3. Replacement wicks

INSTRUMENT OPERATION

1. Before using, take the end cap off the psychrometer and fill the reservoir with water. Be sure the

wick is saturated with water and covers the mercury reservoir on the wet bulb thermometer. Be

sure the mercury reservoir on the dry bulb thermometer is dry.

2. Pull the tube clear of the body so the body can swivel.

3. Holding the tube, whirl the body two to three revolutions per second.

4. Continue whirling until temperatures stabilize (1 1/2 minutes is usually ample).

5. Immediately read the wet bulb thermometer and then the dry bulb thermometer.

6. Figure the difference between the dry bulb and wet bulb temperature. On Table 1, locate the

column, which is headed with this temperature difference. Then locate the row labeled with the

appropriate dry bulb temperature. The value at the intersection of the column and row gives the

dew point.

7. The dew point should be at least 5°F less than the surface temperature of the steel being

painted.

Reissued October 19, 2004 Matls. IM 378

Supersedes October 26, 1999

2

EXAMPLE

If the dry bulb temperature is 71°F and the wet bulb temperature is 64°F, the difference between the

dry bulb and wet bulb is 7°F. At the top of Table 1, locate the column headed with 7. Follow this

column down to the row headed with the dry bulb temperature of 71°F. The intersection of the

column and row gives the number 60, which is the dew point in degrees Fahrenheit. Add 5 degrees

to the dew point to get 65°F. Sixty-five is the minimum surface temperature of the steel before

painting should begin to ensure that there is no condensation on the surface.

NOTES

1. The surface and air temperature will vary depending on the location of the temperature

measurements. For instance, a beam exposed to direct sunlight will be much warmer than a

beam in the shade. Therefore if painting work is done in the shade, temperature measurements

should also be done in the shade.

2. Moisture problems are most likely to be encountered in the morning, so temperature

measurements should be made in the morning before painting begins.

REPORTING RESULTS

The following information should be reported: Time, dry bulb temperature, wet bulb temperature,

dew point, and surface temperature.

Reissued October 19, 2004 Matls. IM 378

Supersedes October 26, 1999

3

Table 1 - Dew Point Temperature - °F

Difference Between Dry Bulb and Wet Bulb - °F

Dry

Bulb °F 0 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20

40 40 38 35 33 -- -- -- -- -- -- -- -- -- -- -- --

41 41 39 36 34 -- -- -- -- -- -- -- -- -- -- -- --

42 42 40 38 35 33 -- -- -- -- -- -- -- -- -- -- --

43 43 41 39 36 34 -- -- -- -- -- -- -- -- -- -- --

44 44 42 40 37 35 -- -- -- -- -- -- -- -- -- -- --

45 45 43 41 38 36 34 -- -- -- -- -- -- -- -- -- --

46 46 44 42 40 37 35 -- -- -- -- -- -- -- -- -- --

47 47 45 43 41 38 36 33 -- -- -- -- -- -- -- -- --

48 48 46 44 42 40 38 35 -- -- -- -- -- -- -- -- --

49 49 47 45 43 41 38 36 33 -- -- -- -- -- -- -- --

50 50 48 46 44 42 40 37 34 -- -- -- -- -- -- -- --

51 51 49 47 45 43 41 38 36 33 -- -- -- -- -- -- --

52 52 50 48 46 44 42 40 37 34 -- -- -- -- -- -- --

53 53 51 49 47 45 43 41 38 36 33 -- -- -- -- -- --

54 54 52 50 48 46 44 42 40 37 34 -- -- -- -- -- --

55 55 53 51 50 48 45 43 41 38 36 33 -- -- -- -- --

56 56 54 53 51 49 47 44 42 40 37 34 -- -- -- -- --

57 57 55 54 52 50 48 46 43 41 39 36 -- -- -- -- --

58 58 56 55 53 51 49 47 45 42 40 37 -- -- -- -- --

59 59 57 56 54 52 50 48 46 44 41 39 33 -- -- -- --

60 60 58 57 55 53 51 49 47 45 43 40 35 -- -- -- --

61 61 59 58 56 54 52 50 48 46 44 42 36 -- -- -- --

62 62 60 59 57 55 53 52 50 47 45 43 38 -- -- -- --

63 63 61 60 58 56 55 53 51 49 47 44 39 34 -- -- --

64 64 62 61 59 57 56 54 52 51 48 46 41 35 -- -- --

65 65 63 62 60 59 57 55 53 51 49 47 42 37 -- -- --

66 66 64 63 61 60 58 56 54 52 50 48 44 38 -- -- --

67 67 65 64 62 61 59 57 55 53 52 49 45 40 34 -- --

68 68 67 65 63 62 60 58 57 55 53 51 46 42 36 -- --

69 69 68 66 64 63 61 59 58 56 54 52 48 43 37 -- --

70 70 69 67 65 64 62 61 59 57 55 53 49 44 39 33 --

71 71 70 68 67 65 63 62 60 58 56 54 50 46 41 35 --

72 72 71 69 68 66 64 63 61 59 58 56 52 47 42 37 --

73 73 72 70 69 67 66 64 62 60 59 57 53 49 44 38 --

74 74 73 71 70 68 67 65 63 62 60 58 54 50 45 40 34

75 75 74 72 71 69 68 66 64 63 61 59 55 51 47 42 36

76 76 75 73 72 70 69 67 66 64 62 60 56 53 48 43 38

77 77 76 74 73 71 70 68 67 65 63 62 57 54 50 45 39

78 78 77 75 74 72 71 69 68 66 64 63 58 55 51 46 41

Reissued October 19, 2004 Matls. IM 378

Supersedes October 26, 1999

4

Table 1 - Dew Point Temperature - °F (cont.)

Difference Between Dry Bulb and Wet Bulb - °F

Dry

Bulb °F 0 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20

79 79 78 76 75 73 72 70 69 67 66 64 59 57 53 48 43

80 80 79 77 76 74 73 72 70 68 67 65 61 58 54 50 44

81 81 80 78 77 75 74 73 71 70 68 66 63 59 55 51 49

82 82 81 79 78 77 75 74 72 71 69 67 64 60 57 52 50

83 83 82 80 79 78 76 75 73 72 70 69 65 62 58 54 52

84 84 83 81 80 79 77 76 74 73 71 70 66 63 59 55 53

85 85 84 82 81 80 78 77 75 74 72 71 68 64 61 57 54

86 86 85 83 82 81 79 78 76 75 73 72 69 65 62 58 56

87 87 86 84 83 82 80 79 78 76 75 73 70 67 63 59 57

88 88 87 85 84 83 81 80 79 77 76 74 71 68 64 61 59

89 89 88 86 85 84 82 81 80 78 77 75 72 69 66 62 60

90 90 89 87 86 85 83 82 81 79 78 76 73 70 67 63 61

91 91 90 88 87 86 85 83 82 80 79 78 75 71 68 65 63

92 92 91 89 88 87 86 84 83 81 80 79 76 73 69 66 64

93 93 92 90 89 88 87 85 84 83 81 80 77 74 71 67 65

94 94 93 92 90 89 88 86 85 84 82 81 78 75 72 68 67

95 95 94 93 91 90 89 87 86 85 83 82 79 76 73 70 68

96 96 95 94 92 91 90 88 87 86 84 83 80 77 74 71 69

97 97 96 95 93 92 91 89 88 87 85 84 81 78 75 72 70

98 98 97 96 94 93 92 90 89 88 87 85 82 79 76 73 72

99 99 98 97 95 94 93 92 90 89 88 86 83 81 78 74 73

100 100 99 98 96 95 94 93 91 90 89 87 85 82 79 76 74

101 101 100 99 97 96 95 94 92 91 90 88 86 83 80 77 75

102 102 101 100 98 97 96 95 93 92 91 89 87 84 81 78 76

103 103 102 101 99 98 97 96 94 93 92 91 88 85 82 79 78

104 104 103 102 100 99 98 97 95 94 93 92 89 86 83 80 79

105 105 104 103 101 100 99 98 96 95 94 93 90 87 84 82 80

106 106 105 104 102 101 100 99 98 96 95 94 91 88 86 83 81

107 107 106 105 103 102 101 100 99 97 96 95 92 90 87 84 82

108 108 107 106 104 103 102 101 100 98 97 96 93 91 88 85 84

109 109 108 107 105 104 103 102 101 99 98 97 94 92 89 86 85

110 110 109 108 106 105 104 103 102 100 99 98 95 93 90 87 86

[homeweatherstation]

Instruments for Predicting the Weather

When planning future outdoor activities such as weddings, gardening or a vacation, many people check on the weather outlook by reviewing their local meteorologist's predictions either online or by watching their daily news broadcast. Meteorologists form their predictions based on information gathered from various types of weather instruments such as thermometers, barometers and hygrometers.

Thermometer

Weather events are predicted by temperature variations. Thermometers use a liquid—typically red in color—such as mercury or alcohol to monitor changes in temperature. This liquid expands as it becomes hotter and contracts as it cools, giving the thermometer its recognized shape of a thin red or silver line moving up or down. Some thermometers, known as spring thermometers, gauge the temperature by monitoring the expansion and contraction of metal. Three different scales are used by thermometers to measure temperature: Fahrenheit, Celsius, and Kelvin, which is typically employed by scientists. Galileo invented the thermometer by using a tool he dubbed a "thermoscope."

Barometer

The barometer, which was first created by the Italian scientist Evangelista Torricelli in the 17th century, measures atmospheric pressure and aids meteorologists in forecasting weather patterns. Changes in the weather are typically predicted by these minute variations in atmospheric pressure. Mercury or thin metallic strips are used in barometers to display variations in pressure. Based on Toricelli's research, a mercury barometer places a small amount of mercury in a vacuum. Depending on whether the air pressure is heavier than or lighter than the mercury's own weight, the mercury goes up or down. Aneroid barometers are frequently seen in homes and measure changes in atmospheric pressure by monitoring the expansion and contraction of two metallic strips.

Hygrometer

A hygrometer is a device that meteorologists use to measure the atmosphere's humidity and forecast weather patterns. Hygrometers gauge humidity by using a tiny metal coil, a liquid, or condensation. The coil's physical shape is altered when moisture comes in contact with it. Condensation hygrometers, often known as "dew point" hygrometers, gauge how much condensation forms on a tiny bulb. Last but not least, liquid hygrometers rely their readings on chemical alterations in the liquid brought on by moisture in the air. A psychrometer, the fourth type of hygrometer, measures moisture by contrasting a dry bulb with one that has been soaked with distilled water using thermodynamic principles. The first hygrometer was created in 1783 by the Swiss physicist and geologist Horace Benedict de Saussure, using human hair as the coil.

[mathsciexplanations]

@captainswan618. Information on psychrometers!

[usnatarchives]

Ike and Mamie play Scrabble at Camp David, 7/30/1954, Eisenhower Library, NARA ID 67-82-A-17.

HAPPY NAT'L SCRABBLE DAY!

Marines aboard the amphibious assault ship USS OKINAWA (LPH 3) play Scrabble under the aft Mark 33 3-inch/50-caliber gun mount, 12/1/1987, NARA ID 6430922.

By Miriam Kleiman, Public Affairs

As a special Scrabble Day gift, here are some archival Scrabble -approved words for your next big game!

Albumen - an albumen photo is one created using a silver halide as the light-sensitive agent and egg whites (albumen) as the binder.

Foxing - discoloration on paper, generally in the form of random rust colored spots.

Halide - in silver halide film, the light sensitive ingredient is a silver halide emulsion

Hygrometer/Psychrometer - instruments used to measure temperature and relative humidity

Lignin - a component of the cell walls of plants, along with cellulose; its presence in paper may contribute to chemical degradation.

Plasticizer - an added chemical used to make PVC more flexible.

Thymol - a toxic, carcinogenic, crystalline compound once used as a preservative and fungicide.

Close up of NARA ID 6430922.