Humidity Measurement - TESTO 400 Instruction Manual

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
- dew point temperature (td °C)
- absolute humidity (g/m
- absolute humidity (g/kg)
if dependent on pressure please set the absolute pressure under
SPECIAL - P
ARAMETER
- 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
- pressure dew point (tdat °C): to atmospheric dew point (1013mbar) of calculated dew point
under pressure.
Please adjust duct pressure at SPECIAL - P
atmospheric dew point td °C.
Following activation via
can be deactivated via INSTRUMENT - U
- Humidity:
3
)
for correct pressure compensation.
an additional channel is generated in addition to %RH and ° C. This
NITS

Humidity measurement

Inserting calculated parameters
-
ARAMETER ABS
- . P
ARAMETER ABS
- Humidity - Off .
24
. P .
RESS
. The instrument indicates
RESS