Hygrometer psychrometric VIT-1

Product Code: 100959

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Hygrometer VIT-1 is designed to measure relative humidity and air temperature.

Specifications:

Relative humidity measurement range, % 20%...90%.

Temperature range of humidity measurement, °C 5°C...25°C.

Temperature measurement range, °C 0°C...25°C.

Scale division value of thermometers, °C 0.2°C.

The absolute error of thermometers, taking into account the introduction of amendments, should not exceed, °C ± 0.2 °C.

The absolute error limit of VIT-1 at an aspiration rate of 0.5 to 1 m/s is indicated in Table 1.

Table 1

Dry thermometer temperature, °C	U,%
5°C to 10°C incl. Over 10°C up to 30°C incl. Over 30°C up to 40°C incl.	±7% ±6% ±5%

Overall dimensions, mm, no more – 325x120x50.
Weight, g, no more than 350.

Safety requirements for hygrometer VIT-1
When working with a hygrometer, it is prohibited:
subject the hygrometer to sharp blows both during installation and during operation;
wipe the scale of thermometers and the psychrometric table with solvents, acids and other similar liquids;
overheat hygrometer thermometers above 45°C. Overheating destroys the thermometer reservoir.

The structure and principle of operation of the device psychrometer VIT-1
The psychrometric hygrometer VIT-1 consists of a plastic base to which two thermometers with a scale, a psychrometric table, and a glass feeder are attached. The reservoir of the thermometer with the inscription “Humidified” is moistened with water from the feeder using a batiste or chiffon wick.
The method of measuring relative humidity with a psychrometric hygrometer VIT-1 is based on the relationship between air humidity and the psychrometric difference - the difference in the readings of “dry” and “wet” thermometers, which are in thermodynamic equilibrium with the environment.
Take readings of thermometers and after entering corrections to their readings, determine the difference in readings of thermometers. Then, according to the readings of the “dry” thermometer and the difference between the readings of the “dry” thermometer and the “humidified” one, determine the relative humidity of the air according to the psychrometric table.

How the VIT-1 hygrometer works
Take readings on the dry and wet thermometers.
Determine the temperature using thermometers with an accuracy of 0.1 ° C, introducing amendments to the thermometers given in the passport for the VIT-1 hygrometer into the marked readings. Calculate the temperature difference between dry and wet thermometers. Corrections are introduced by algebraic addition.
If there are no corrections in the passport for taking readings using "dry" and "wet" thermometers, calculate the corrections by linear interpolation for two corrections that refer to temperatures between which the reading from thermometers lies.
Determine the relative humidity of the air according to the psychrometric table. The desired relative humidity will be at the intersection of the lines of temperature according to the “dry” thermometer and the temperature difference according to the “dry” and “wet” thermometer.
If the table does not contain the obtained temperature difference according to the “dry” and “wetted” thermometers of the psychrometric hygrometer VIT-1, use interpolation to determine the humidity. If there is no dry bulb temperature in the table, to determine humidity, use interpolation only for those parts of the psychrometric chart in which a 1°C dry bulb temperature measurement results in a relative humidity change of more than 1%. For the remaining parts of the table, the temperature value according to the “dry” thermometer, round to the nearest table value according to the arithmetic rounding rule.

An example of determining relative humidity by interpolation (psychrometers VIT-1).
We determine the temperatures using the “dry” and “wetted” thermometers VIT-1 and the difference between these temperatures.

thermometers	Measured temperatures, °C	Corrections to temperatures according to the passport, °С	Temperature after correction, °С
"dry"	Тс=22.5°С	-0.15°С	22.35°С
“moisturized”	Tu=16.1°С	+0.20°С	16.3°С

We accept Tc=22.4 temperature difference (Tc-Tu) is equal to: 22.4-16.3=6.1
We determine the relative humidity for Tc = 22.4°C, for which we interpolate the relative humidity value according to the table for Tc from 22 to 23°C. With an increase in temperature by 1°C, the humidity increases by 2%, and with an increase in temperature by 0.4°C, the humidity increases by 0.4x2=0.8% 48+0.8=48.8.
We determine the relative humidity for Тс=22.4°С and Тс-Ту=6.1°С, for which we interpolate the relative humidity value at a difference in readings from 6.0 to 6.5°С. With an increase in Tc-Ty by 0.5 ° C, the relative humidity decreases by 4%, and with an increase in Tc-Ty by 0.1 ° C, the relative humidity decreases by (0.1x4.0): 0.5 \u003d 0.8% .
Consequently, the humidity “phi” at a temperature of 22.4 and Tc-Tu=6.1°C will be equal to 48.8-0.8=48%.

Hygrometers psychrometric VIT-1
psychrometric table
aspiration speed from 0.5 to 1.0 m/s

Show. dry term., ° С	Difference in thermometer readings, °C
	0.5	1.0	1.5	2.0	2.5	3.0	3.5		4.0		4.5		5.0	5.5
	Relative humidity, %
5	91	83	75	66	58	50		42		34		26	19
6	92	84	76	67	60	52		45		37		thirty	22	15
7	92	84	77	69	62	54		47		40		33	26	19
8	92	85	78	70	63	56		49		42		36	29	22
9	93	86	79	71	65	58		51		45		38	32	25
10	93	86	79	73	66	60		53		47		41	34	28
eleven	93	87	80	74	67	61		55		49		43	37	31
12	93	87	81	75	69	63		57		51		45	40	34
13	94	88	82	76	70	64		58		53		47	42	36
14	94	88	82	76	71	65		60		54		49	44	39
15	94	88	83	77	72	66		61		56		51	46	41
16	94	89	83	78	73	68		63		57		52	48	43
17	95	89	84	79	74	69		64		59		54	49	45
18		90	84	79	74	70		65		60		55	51	47
19		90	85	80	75	70		66		61		57	52	48
20		90	85	81	76	71		67		63		58	54	50
21		90	85	81	77	72		68		64		59	55	51
22		91	85	82	77	73		69		64		61	56	52
23		91	86	82	78	74		70		65		62	58	54
24		91	87	83	78	74		70		66		62	59	55
25		91	87	83	79	75		71		67		63	60	56

Show. dry term., ° С	Difference in thermometer readings, °C
	6.0	6.5	7.0	7.5	8.0	8.5	9.0	9.5	10.0		10.5		11.0
	Relative humidity, %
5
6
7
8	16
9	19
10	22	16
eleven	26	20
12	28	23	18
13	31	26	20
14	33	28	23	18
15	36	31	26	21	18
16	38	33	29	24	20
17	40	35	31	27	22	19
18	42	37	33	29	24	21	17
19	44	39	35	31	27	23	19
20	45	41	37	33	29	25	22	18
21	47	43	39	35	31	28	24	21	17
22	48	44	41	37	33	thirty	26	23	19
23	50	46	42	39	35	32	28	25	21	18
24	51	48	44	40	37	33	thirty	27	24	20
25	52	49	45	42	38	35	32	29	26	22		19

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