ROTRONIC PF4 - Manual (Page 24)

E-M-PF4-V1_00
Rotronic AG
Bassersdorf, Switzerland
Document Code Unit
PF4 Differential Pressure Transmitter:
Instruction Manual
Instruction Manual
Document Type
Page 24 of 54
Document Title
© 2014; Rotronic AG E-M-PF4-V1_00
5.2 Wiring
This section describes the wiring of the device with connection possibilities.
5.2.1 Electrical Diagrams
The PF4 is wired with a four-pin connection cable
for transmission of the electrical power and
measured values. The maximum permissible
cable length depends on the voltage drop caused
by the flow of current to the devices connected to
the PF4 outputs. The effective load of a PF4 output
comprises the cable and load resistance and
should amount to at least 1000 ohm. The cable
resistance should not be more than 1/1000 of the
load resistance.
Figure 12: Voltage outputs
The maximum permissible length of the cable
connecting the unit to other devices is determined
by the total resistance resulting from addition of
the cable resistance and resistance of the devices
connected to the unit in series. This resistance
should not exceed 500 ohm (load).
Figure 13: Current outputs