21
UK
9.3.5 Zero point calibration
Setting of an offset value for accuracy optimisation for differential pressure
measurement�
►
Select [COF] and set a value between -10 % and 10 % of the measuring
span� The internal measured value "0" is shifted by this value�
►
The following setting values improve the accuracy by 6 mbar per 1 bar
system pressure:
For system pressure
[bar]
Setting value for
PN7809 / PY7809
in %
Setting value for
PN7834 in %
1
-0�2
---
2
-0�6
---
3
-0�9
-0�1
4
-1�2
-0�1
5
-1�6
-0�2
6
-2�0
-0�2
7
-2�4
-0�2
8
-2�7
-0�3
9
-3�0
-0�3
10
-3�4
-0�4
As an alternative: automatic adjustment of the offset in the range 0 bar ± 10
% of the measuring span�
►
Make sure that the differential pressure is 0 bar or as close as possible
to the 0 bar mark�
►
Press [Mode/Enter] until [tCOF] appears�
►
Press [Set] and keep it pressed�
> The current offset value ( in %) briefly flashes�
►
Release [SET]�
►
Press [Mode/Enter] briefly (= to confirm the new offset value)�
Reset of the teached value:
►
Select [COF] and set the value [0]�
