Instructions

 

For using a Wet-Bulb Thermometer:

This instrument is for use in Forced Draught Electric Incubators, it is not intended for use in Still-Air Incubators.

Inspect mercury column carefully before using to ensure no small pieces of mercury are separated from main column. Check for broken mercury column regularly.

For accurate wet-bulb reading, the wick must be thoroughly wet and cover the mercury bulb completely. When new it is necessary to soak the wick in warm water and squeeze it out a number of times to make the material freely absorbent.

Wick should hang straight down into the water in glass bowl, if a loop is allowed to hang over, the water may drip away. Replenish water so that the wick never dries out. Wash wick clean frequently and after every hatch. Dust and fluff clog the capillary action of cotton, and it is wise to replace wick after every few hatches. Use only the same wick as supplied with the instrument. 

When hanging the wet-bulb thermometer, ensure mercury bulb end is a little lower than the bottom end of the thermometer. For easy reading, twist the thermometer so magnified mercury column is clearly seen in most convenient viewing position.

 

Relative Humidity Tables 

W.B = Wet-Bulb Thermometer Reading (°F) and R.H = Relative Humidity %

At 99°F At 99°F At 100°F At 100°F At 101°F At 101°F
           
W.B R.H W.B R.H W.B R.H
           
83 51 83 49 83 49
84 53 84 52 84 52
85 55 85 54 85 54
86 59 86 57 86 57
87 61 87 59 87 59
88 64 88 62 88 62
89 67 89 65 89 65
90 70 90 68 90 68
91 73 91 68 91 71
92 76 92 74 92 74
93 79 93 77 93 77
94 83 94 80 94 80

 

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