Calibration Operation
The standard humidity solution is a saturated salt solution, and each set of standard solution contains 1 bottle of sealed ampoule solution, which can be stored for a long time. Repeat shaking to evenly distribute the salt solution before use. Salt solutions are non-toxic and harmless to contact with skin, but may be toxic if swallowed in large quantities.
Place a textile pad at the bottome of the calibration device, which is filled with salt solution with known humidity value. Insert the humidity sensor probe into the chamber of the measuring bottle, and ensure that it is completely sealed and not affected by the ambient air. Let stand for at least 20 minutes to make the temperature and humidity environment in the chamber can be balanced, and then carry out accurate calibration.
Calibration Precision
|
Humidity value %RH
|
Precision 20±2℃
|
|
11%RH
|
±0.5%RH
|
|
23%RH
|
±0.5%RH
|
|
43%RH
|
±0.5%RH
|
|
59%RH
|
±0.5%RH
|
|
85%RH
|
±0.5%RH
|
The humidity value of each bottle of standard humidity solution was precisely titrated by chloride ions.
Humidity comparison table of saturated salt solution
|
Temp\#
|
CF1
|
CF2
|
CF3
|
CF4
|
CF5
|
|
5℃
|
11.26±0.47
|
23.86±0.62
|
43.13±0.50
|
60.35±0.55
|
87.67±0.45
|
|
10℃
|
11.29±0.41
|
23.38±0.53
|
43.14±0.39
|
58.86±0.43
|
86.77±0.39
|
|
15℃
|
11.30±0.35
|
23.40±0.32
|
43.15±0.33
|
57.36±0.33
|
85.92±0.33
|
|
20℃
|
11.31±0.31
|
23.11±0.25
|
43.16±0.33
|
55.87±0.27
|
85.11±0.29
|
|
25℃
|
11.30±0.27
|
22.51±0.32
|
43.16±0.89
|
54.38±0.23
|
84.34±0.26
|
|
30℃
|
11.28±0.24
|
21.61±0.52
|
43.17±0.50
|
52.89±0.22
|
83.62±0.25
|
The humidity errors corresponding to saturated salt solution vary by different ambient temperatures, and the humidity error is the smallest at 20℃.
Data download:
HUMC01 Salt Solution for Humidity Calibration Product Manual