halstrup-walcher P29 Instruction Manual

Also see for P29: Original instruction manual

P29 Instruction Manual148.2 ScalingThe P29 is usually supplied with standard measuring ranges. You can use the scale to adjustthe measuring range for your own use. The output voltage or currents are then copied to thisscaled range. The scaled range should always be more than 0.1 times of that of the P29’smeasuring range, because otherwise the resolution of the outputs and the accuracy will bepoorer.With this menu item, there are 4 sub-menu items:• Pressure• Volumetric flow• Mass flow• Flow rate8.2.1 PressureThis is an important menu item. It is used to specify the pressure range, which indicates theoutput value. This pressure range forms the basis for many other settings such as the limitsfor 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 arealso possible.8.2.1.1 TopWith this menu item, you can set the pressure at which the output will achieve its maximumvalue. Any value within the measuring range can be selected. It can also be less than thelower scale value.8.2.1.2 BottomWith this menu item, you can set the pressure at which the output will achieve its minimumvalue. Any value within the P29’s measuring range can be selected.8.2.1.3 UnitUse this menu item to select the pressure unit. The following pressure units can be selected:Pa, hPa, kPa, mbar, mmH2 O, mmHg, Psi, inH2O, inHg8.2.2 Volumetric flowThis menu item is used to adjust the volumetric flow display values.The following sub-menu items are available:ValueUnit