ROTRONIC PF4 - Manual (Page 30)

E-M-PF4-V1_00
Rotronic AG
Bassersdorf, Switzerland
Document Code Unit
PF4 Differential Pressure Transmitter:
Instruction Manual
Instruction Manual
Document Type
Page 30 of 54
Document Title
© 2014; Rotronic AG E-M-PF4-V1_00
6.4.4 Scaling of the Analog Input
The analog input can be scaled within the range 0…3.2 V / 0…25 mA. If, for example, only 1...2.5 V are to be
shown in the display due to the application or a connected third-party probe, the analog input must be scaled
accordingly. Figure 16 illustrates scaling of the analog input.
Legend for Figure 16 :
Input-Range: 0…3.2 V / 0…25 mA
RangeLo: 0 V / 0 mA (lowest input value)
RangeHi: 3.2 V / 25 mA (highest input value)
ScaleLo: Bottom scale limit (min. value shown in display)
ScaleHi: Top scale limit (max. value shown in display)
Figure 16: Graphic representation of scaling the analog input
Example:
An ambient pressure sensor with an analog output of 500…1000 mV (900…1100 hPa) is to be connected and
its signal shown in hPa. The Input-Range with the limits RangeLo = 500 mV and RangeHi = 1000 mV and the
display range Scale with ScaleLo = 900 and ScaleHi = 1100 mean that an input voltage of 500 mV shows the
value 900 in the display and an input voltage of 1000 mV the value 1100. The unit is configured with the HW4
software as "hPa".
Remark on PF4 with HC2 and analog input:
The formula for calculation of the Display-Value is:
∗