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Calculated Parameters
• Dewpoint temperature Td (calculated from Ta and RH)
• Delta T TΔ (= Ts - Td)
• Dry bulb temperature Tdb (= Ta)
• Wet bulb temperature Twb (calculated from Ta and RH, see note below)
• Specific humidity SH (calculated from Ta and RH)
Note: The formula used for calculation of Twb and SH uses a fixed value of air pressure set at 1.0
atmosphere (1013 mbar). The accuracy of the Twb and SH will vary at other values of atmospheric
pressure. This variation may be greater than ±1°C for Twb and ±1%/10mb for SH.
Operating Range
The ranges listed below refer to the maximum range that the gauge is capable of displaying
• Surface temperature (built-in probe)
• External temperature (Elcometer external probe)Ts -40°C to 200°C (-40°F to 392°F)
• Air temperature
• Relative humidity
• Specific humidity
• Gauge LCD display
20
Ts -20°C to 80°C (-4°F to 176°F)
Ta -20°C to 80°C (-4°F to 176°F)
RH 0 % to 100 % RH
SH 0 g/kg to 325 g/kg (0 gr/lb to 2275 gr/lb)
-20°C to 80°C (-4°F to 176°F)
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