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→How do I get good temperature and humidity measurements: air frost definition correction
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== How do I get good temperature and humidity measurements == | == How do I get good temperature and humidity measurements == | ||
The international standard states ambient air temperature/humidity is measured at 1.25 metres above ground level, above soil or grass not paving, protected from direct sun radiation (and direct rain), unless you are measuring soil or ground temperatures. The height is important for derived values as an air frost is defined as a temperature below the freezing point for water at this height, and the count of these is a standard reporting requirement in some countries. | The international standard states ambient air temperature/humidity is measured at 1.25 metres above ground level, above soil or grass not paving, protected from direct sun radiation (and direct rain), unless you are measuring soil or ground temperatures. The height is important for derived values as an air frost is defined as a temperature at or below the freezing point for water at this height, and the count of these is a standard reporting requirement in some countries. | ||
If you are using a ''Fine Offset sensor'', the thin depth of the thermometer/hygrometer (transmitter) should face where your console (receiver) is, for maximum transmission strength/distance, with the wide face at right angles to the transmission route. (Although if you use a model requiring a radio time signal, you will probably be trying to optimise that instead). | If you are using a ''Fine Offset sensor'', the thin depth of the thermometer/hygrometer (transmitter) should face where your console (receiver) is, for maximum transmission strength/distance, with the wide face at right angles to the transmission route. (Although if you use a model requiring a radio time signal, you will probably be trying to optimise that instead). | ||
== Pressure == | == Pressure == | ||