No. 77h Hair-Hygrograph
The Hygrograph records relative humidity of the atmosphere on a 80 mm width recording chart.
This important climatic factor plays a decisive role in the meteorological and climatological investigation.
It has a grey hammertone finished stainless steel housing and glas windows and an outside arranged measuring element. The measuring instrument is characterized by high accuracy and durability for longllife operation .
The high precision model uses a special preparated hair harp made by 5 bundels of 26 human hairs.
The Measuring accuracy of the hair harp corresponds to highest requirements.
The limits of error in the measurement of humidity amount to ±2.5 % of the extent of the measuring range.
Equipped is the instrument with a high quality mechanical spring driven movement in coloured brass drum.
Measuring range: 0...100% relative humidity
Time of drum rotation: daily or weekly
Ø 93.3 mm
Height: 93 mm
height of recording: 80 mm
time of running: app. 9 days
1 fiber pen
1 wetting cloth
1 set of recording charts
(100 charts for daily or weekly rotation)