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A hygrothermograph records temperature and humidity on a line graph using two pens attached to a bimetallic strip and a bundle of human hair. It is often used in areas where tracking fluctuations in both humidity and temperature is important. The speed of rotation of the drum determines the duration of the recording. An axial fan can help correct erroneous readings caused by poor ventilation.
A hygrothermograph is a device used to simultaneously record temperature and humidity on a line graph. It could be battery or spring powered. The device records data, in the form of a line, on a roll of paper which is mounted on a rotating drum, which spins at a predetermined speed. This system provides a visual representation of fluctuations in temperature and humidity over a specific period of time. The lines on the graph are drawn by two separate pens, one attached to a temperature sensitive element and the other attached to a humidity sensitive element. Hygrothermographs are often used in areas where it is important to track fluctuations in both humidity and temperature, such as laboratories, museums and agricultural warehouses.
The temperature sensing element in a hygrothermograph is a bimetallic strip. This component, also used in thermostats and other mechanical devices, is made of two separate metals welded together. The two metals expand and contract at different rates with changes in temperature, causing the tape to move laterally. A lever system attached to the strip amplifies the displacement and moves the upper pen arm up and down across the roll of paper, creating a record of temperature changes in the form of a line graph.
The hygrothermograph detects humidity using a bundle of specially treated human hair. When the humidity in the atmosphere fluctuates, hair expands or contracts. The movement is mechanically transferred to the lower pen arm, which moves up and down to register the humidity.
The speed of rotation of the drum determines the duration of the recording of the hygrothermograph. Many hygrothermographs can be set up for different time intervals, depending on the amount of data required. A faster rotation could cover one day, and a slower rotation could allow the chart to span an entire month. Spring hygrothermographs generally have a limit of about seven days before needing to be reset.
In case of poor ventilation in the room where the device is used, erroneous readings may occur. An axial fan, which is optional as an add-on in many hygrothermograph models, can help correct this problem. The fan works by actively drawing air from the room into the device, allowing for faster and more accurate data logging. The fan requires electricity to operate, so it can only be used if there is battery or other power source nearby.
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