PCE 555 WBGT Meter

Thermo-hygrometer PCE 555 for measuring the ambient air humidity 

Hand-held pocket-size instrument for measuring the ambient air humidity, the room temperature, the dew point and the wet-bulb temperature. This instrument has been designed for quick measurements of the ambient air moisture and the temperature. The dew point (dew point temperature) as well as the wet-bulb temperature will also be determined automatically. The measuring instrument can be used in the building industry and in the field of building services engineering to establish the formation of condensate on surfaces, to prevent mold formation, for analyses and for other purposes. 

Technical specification :

Measuring ranges:
0 ... 100 % relative humidity
-30 ... +100 °C
Resolution:
0.01 % r. h.
0.01 °C
Accuracy:
± 3.5 % r. h. at +25 °C
± 2.5 °C at +25 °C
Display:
4.5-digit dual LCD display
Battery:
1 x 9 V PP3 block battery
Dimensions:
225 x 45 x 34 mm
Weight:
200 g
Contents:
1 x PCE-555 for measuring the ambient air moisture, 1 x carry-all, 1 x battery and operating instructions

Table for the hygrometer Temperature with a dry thermometer Difference of temperature between the dry and the wet thermometer (inº C) (the reading value shows the air relative humidity as a percentage (%)) Celsius degrees 0 1 2 3 4 5 6 7 8 9 10 0 100 82 64 47 31 14 1 100 83 66 50 34 18 2 100 84 68 52 37 22 3 100 84 69 54 40 25 12 4 100 85 70 56 42 28 16 5 100 86 72 58 45 32 19 7 6 100 86 73 60 47 35 23 11 7 100 87 75 61 49 37 26 14 8 100 87 75 62 51 40 29 18 7 9 100 88 76 64 53 42 31 21 11 10 100 88 77 65 55 44 34 24 14 5 11 100 88 77 66 56 46 36 26 17 8 12 100 89 78 68 57 48 38 29 20 11 13 100 89 79 69 59 49 40 31 23 14 6 14 100 90 79 70 60 51 42 33 25 17 9 15 100 90 80 71 61 53 44 35 27 20 12 16 100 90 81 71 62 54 46 37 30 22 15 17 100 90 81 72 63 55 47 39 32 24 17 18 100 91 82 73 65 56 49 41 34 27 20 19 100 91 82 74 65 58 50 43 36 29 22 20 100 91 83 74 66 59 51 44 37 31 24 21 100 91 83 75 67 60 52 45 39 32 26 22 100 92 83 75 68 61 54 47 40 34 28 23 100 92 84 76 69 62 55 48 42 36 30 24 100 92 84 77 70 62 56 49 43 37 31 25 100 92 85 77 70 63 57 51 44 39 33 26 100 92 85 78 71 64 58 51 45 40 34 27 100 93 85 78 71 65 59 53 47 41 36 28 100 93 86 79 72 65 59 53 48 42 37 29 100 93 86 79 72 66 60 54 49 43 38 30 100 93 86 79 73 67 61 55 50 44 39

Wet bulb definition

If we pay attention to the wet thermometer temperature (wet bulb temperature), the same wet bulb temperature is always obtained with different temperature and relative humidity combinations: for instance, the same wet bulb temperature is obtained 10ºC for 20ºC and 23% Hr or for 15°C and  52% Hr, as well as many other combinations which are shown in the table for humidity meters. This fact is very important for the operation of conditioning installations due to the fact that the air which is located can be converted into one state or another without power supply. Taking into account an air mass at  20°C to 23% Hr and transforming water in water vapour without any external power supply, relative humidity increases at the same time that temperature decreases owing to the evaporation cold. All the states obtained during the evaporation process are near the line of the constant wet bulb temperature: at 52% Hr a 10°C temperature is reached. These changes are called adiabatic and are valued in the conditioning technique.

Delivery content: 1 x PCE-555 hygrometer, 1 x carrying case, 1 x battery and user manual

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