Parameters; Scaling - TESTO 6681 Instruction Manual

testo 6681
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1.2.7 Parameters

The following parameters are displayed:
Relative humidity in %RH (technical)
•
Relative humidity in % WMO* (calculation according to the WMO
•
standard)
Temperature °C and °F
•
Dewpoint in °Ctd and °Ftd
•
Absolute humidity in g/m³ and gr/ft³
•
Degree of humidity in g/kg and gr/lb
•
Enthalpy in kJ/kg and BTU/lb
•
Psychrometer temperature in °Ctw and °Ftw
•
Water vapour partial pressure in hPa and "H
•
Water content in ppm
•
Dewpoint of H
•
Mixture humidity H
•
* It is possible that condensation appears as of a displayed humidity
starting from 70 % and is shown on the display. This unit is used in
meteorology, for example. According to the WMO, the Magnus
coefficient is used for sub-cooled water in the calculation of relative
humidity.

1.2.8 Scaling

There are three types of min./max. values:
1
The measuring range
The maximum sensor performance is in this range. Values outside of
the measuring range are displayed via messages, for example.
Measuring range, see table (below).
2
Standard scaling
The output signals are assigned to this measuring range as standard:
- during delivery if no entries are made in the order code
- 1.2 Product description
vol
O mixture in °Ctm and °Ftm
2 2
O
2 2
Calculated humidity variables correspond to the medium of
air. With other gases/gas compositions, deviations may
occur, e.g. with the enthalpy
and % vol
in %RH
m
O (inch H O)
2 2