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FW-F103-P-XN-M_v2002_03_EN.docx
Pulse-signal PNP / PNP-LP
The F103-P is suitable for use with flowmeters which have a PNP output signal. 3V is offered on
terminal 11 which has to be switched by the sensor to terminal 10 (SIGNAL). For a reliable pulse
detection, the pulse amplitude has to go above 1.2V. Signal setting PNP-LP employs a low-pass
signal noise filter, which limits the maximum input frequency (read chapter 3).
Fig. 29: Terminal connections – PNP signal input
When an external voltage needs to be used (e.g. if a higher voltage is required by the flowmeter),
this voltage must be limited to the V
in-max
of 10V dc.
Alternatively, an active flowmeter can be connected to the isolated pulse input which has higher
maximum values; please see Terminal 17-18: Isolated pulse input – Type IG.
Reed-switch
The F103-P is suitable for use with flowmeters which have a reed-switch. To avoid pulse bounce
from the reed-switch, it is advised to select REED LP – low-pass filter (read chapter 3).
Fig. 30: Terminal connections – Reed-switch signal input
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