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When used with testo 400/650, the multi-function humidity probes from Testo (e.g. 0636.9740)
show readings for relative humidity and the corresponding temperature after switch-on. Once
is pressed one of the following parameters from a list can be added in the Main menu under
INSTRUMENT - U
NITS - Humidity:
- dew point temperature (td °C)
- absolute humidity (g/m
3
)
- absolute humidity (g/kg)
→ if dependent on pressure please set the absolute pressure under
SPECIAL - P
ARAMETER for correct pressure compensation.
- enthalpie (J/g or kJ/kg)
→ this variable is also dependent on pressure
- psychrometric wet-bulb temperature (PSYC °C)
- water vapour partial pressure (mbar)
- water level (V ppm, displayed unit in display: ppm): describes volume levels of water vapour
in the complete sample gas.
→ Please adjust current pressure at SPECIAL - P
ARAMETER - ABS. PRESS.
- pressure dew point (tdat °C): to atmospheric dew point (1013mbar) of calculated dew point
under pressure.
→ Please adjust duct pressure at SPECIAL - P
ARAMETER - ABS. PRESS. The instrument indicates
atmospheric dew point td °C.
Following activation via an additional channel is generated in addition to
%RH and ° C. This
can be deactivated via INSTRUMENT - U
NITS - Humidity -
Off
.
Humidity measurement
Inserting calculated parameters
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