4 Transmitter
17
the relative humidity the Magnus coefficient with undercooled
water is used in accordance with WMO.
Calculated humidity variables correspond to the medium of
air. With other gases/gas compositions, deviations may
occur, e.g. with the enthalpy.
•
Dewpoint of H
2
O
2
mixture in °C
tm
and °F
tm
•
Temperature °C and °F
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4.2.8. 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
◦
after exchanging the unit, the measuring range recorded in
the instrument is applied as standard.
The transmitter even retains its scaling with the voltage
disconnected.
Measuring range, see table (below).
3
The maximum settings for the manual scaling
◦
The maximum limits can be calculated as follows:
X = difference between MIN. and MAX. value of the
standard scaling
(Max. value of standard) + (50 % of X)
(Min. value of standard) - (50 % of X)
◦
It is thus possible to scale beyond the measuring range, e.g.
for the adjustment of the scaling limits to standard values of
a PLC.
With the alarm definition, however, the physical measuring
range limits are decisive.
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