TESTO 6351, Instruction Manual

Page: 16 / 84

4 Transmitter
16
4.2.6. Parameters
The following parameters are displayed:
• Differential pressure in Pa, hPa, kPa, mbar, bar, mmH
2
O, inch
H
2
O, inch HG, kg/cm
2
, PSI
• Flow 3 in m/s, ft/min
• Volumetric flow rate
4
in m
3
/h, l/min, Nm
3
/h, Nl/min
• Mixture humidity H
2
O
2
in %RH
m
.
•
4.2.7. 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.
3 To prevent fluctuating flow rate values at the zero point (depressurized), the flow rate values are only
calculated as of differential pressures > 0.2 Pa or > 0.1 % of the respective measuring range (whichever is the
greater). With smaller differential pressures, the flow rate value remains at 0.00 m/s.
4 Calculated