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www.hoentzsch.com U426_flowtherm Ex_B_e_171206
Following profile factors are to be set for vortex sensors VA40 subject to the pipe diameter:
Pipe ID
in mm
PF for VA40
Pipe ID
in mm
PF for VA40
80
0.719
160
0.808
90
0.729
170
0.819
100
0.738
180
0.830
110
0.750
190
0.839
120
0.761
200
0.842
130
0.773
300
0.845
140
0.784
400
0.850
150
0.796
...
0.860
For measurements in larger free jet as well as larger ducts or measuring tubes PF = 1.000 results in the
local/punctual velocity.
With
TABLE a profile factor subject to the set diameter of the measuring surface (5.3.8.1) is recom-
mended. This value can be verified or also amended before saving. With rectangular selected as measur-
ing surface, the surface is converted to circular for the proposed value and this value is approximate.
PF = 1.000 must always be set for VADi… measuring tubes calibrated with pairs of values!
5.3.8.3
Damping
The damping rate set here affects the measured value display, if VA is selected as sensor in the display
settings (see 5.3.19.1).
Damping/s: enter the damping time from 01 to 99 seconds
Example 10 seconds: after every second the arithmetical average from the last 10 seconds is displayed.
5.3.9
VA – Operating conditions
Menu -> Settings -> Sensor -> VA Input -> Operating conditions
When selecting the relevant units (see 5.3.19.6) service temperature and working pressure are needed for
calculation purposes. The operating conditions can be entered in this menu, or determined with connected
sensor.
5.3.9.1
Working temperature
Measured or entered value in °C
5.3.9.2
Working pressure
Measured or entered value in hPa
5.3.10
VA – Standard conditions
Menu -> Settings -> Sensor -> VA Input -> Standard conditions
Standard conditions for Höntzsch are 0 °C (32 °F) and 1013 hPa (14.7 psia). Any standard can be set via
the standard temperature and standard atmospheric pressure parameters.
5.3.10.1
Standard temperature
Input value in °C
