P29 Instruction Manual
14
8.2 Scaling
The P29 is usually supplied with standard measuring ranges. You can use the scale to adjust
the measuring range for your own use. The output voltage or currents are then copied to this
scaled range. The scaled range should always be more than 0.1 times of that of the P29’s
measuring range, because otherwise the resolution of the outputs and the accuracy will be
poorer.
With this menu item, there are 4 sub-menu items:
•
Pressure
•
Volumetric
flow
•
Mass
flow
•
Flow
rate
8.2.1 Pressure
This is an important menu item. It is used to specify the pressure range, which indicates the
output value. This pressure range forms the basis for many other settings such as the limits
for the warnings and factors for the flow display.
There are two default settings for the pressure scale:
Top = Pressure at which the output has its maximum value (e.g. 5V, 10V or 20 mA)
Bottom – Pressure at which the output has its minimum value (e.g. -5V, 0V, 0mA or 4mA)
Because the values can be freely assigned, settings such as 0V at 0Pa or 10V at -250Pa are
also possible.
8.2.1.1 Top
With this menu item, you can set the pressure at which the output will achieve its maximum
value. Any value within the measuring range can be selected. It can also be less than the
lower scale value.
8.2.1.2 Bottom
With this menu item, you can set the pressure at which the output will achieve its minimum
value. Any value within the P29’s measuring range can be selected.
8.2.1.3 Unit
Use this menu item to select the pressure unit. The following pressure units can be selected:
Pa, hPa, kPa, mbar, mmH
2
O, mmHg, Psi, inH
2
O, inHg
8.2.2 Volumetric flow
This menu item is used to adjust the volumetric flow display values.
The following sub-menu items are available:
Value
Unit