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Indoor-outdoor thermometer
An indoor-outdoor thermometer is a thermometer that simultaneously provides a measurement of the indoor and outdoor temperatures. The outdoor part of the thermometer requires some kind of remote temperature sensing device. Conventionally, this was done by extending the bulb of the thermometer to the remote site. Modern instruments are more likely to use some form of electronic transducer.
==Glass thermometer==
In an indoor-outdoor thermometer based on a conventional liquid-in-glass thermometer, the stem of the outdoor thermometer is connected to the bulb by a long, flexible or semi-rigid capillary. The temperature scale is marked on the stem as usual. However, the temperature that is actually measured is the temperature at the bulb.〔McGee, p. 130〕
Ambient corrections are difficult to achieve with this system and are not usually done. Consequently, it is not as accurate as a conventional precision thermometer. Rather, it is typically used for low-cost applications such as private houses. The main issue with accuracy is that if the bulb and the stem are at different levels, there is a change in reading due to the change in pressure head. A further problem is that changes in the ambient temperature of the indoor part of the device can cause a change in reading as well as the temperature of the outdoor part of the device. This effect can be minimised by making the bulb large and the capillary a small diameter. This ensures that changes in the outside temperature produce large changes in the column of liquid in the stem and will tend to swamp the smaller changes caused by the changes in the indoor temperature.〔McGee, pp. 128-30〕
Common working liquids used are toluene and alcohol. Both of these have large temperature coefficients of expansion and do not freeze or boil in the temperature range of interest.〔McGee, p. 130〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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