ROTRONIC PF4 - Manual (Page 43)

E-M-PF4-V1_00
Rotronic AG
Bassersdorf, Switzerland
Document Code Unit
PF4 Differential Pressure Transmitter:
Instruction Manual
Instruction Manual
Document Type
Page 43 of 54
Document Title
© 2014; Rotronic AG E-M-PF4-V1_00
7 Maintenance
Warning:
If only the service cable AC3009 is used to supply power to the PF4, the differential pressure shown will not be
correct because the voltage supply to the electronics is insufficient. For calibration or adjustment with the HW4
software, therefore, the power must be supplied via terminal block K2 in the bottom part of the housing.
7.1 Service Cable
Suitable service cables
 AC3006: requires additional power supply to the device
 AC3009: supplies the device directly with 5 VDC, differential pressure measurement will,
however, not be correct without external power supply
7.2 Service Port
The Mini-USB service port is located inside the device. The device must be opened by unscrewing the four
screws on the front of the housing in order to gain access to the Mini-USB service port.
Remark: AC3006 / AC3009 may be used as service cable.
Figure 19: Location of the service port on the top side of the circuit board