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FW-E115-P-M_v0203_03_EN.docx
Pulse-signal NPN / NPN-LP
The E115-P is suitable for use with flowmeters which have a NPN output signal. For reliable pulse
detection, the signal should be above 1.4V or below 1.0V under all circumstances. It is advised to
use a sensor which is normally open and is closed for a small time (less power consumption). For
better noise immunity and if no high sensor input frequencies are expected it is advised to select
signal setting NPN-LP – low-pass signal noise filter which limits the maximum input frequency, to
avoid pulse bounce (see paragraph 3.3.7 for more information).
Fig. 19: Terminal connections – NPN signal input
Pulse-signal PNP / PNP-LP
The E115-P is suitable for use with flowmeters which have a PNP output signal. 3.0V is offered on
terminal S3 which has to be switched by the sensor to terminal S2 (SIGNAL). For reliable pulse
detection, the signal should be above 1.4V or below 1.0V under all circumstances. It is advised to
use a sensor which is normally open and is closed for a small time (less power consumption). For
better noise immunity and if no high sensor input frequencies are expected it is advised to select
signal setting PNP-LP – low-pass signal noise filter which limits the maximum input frequency, to
avoid pulse bounce (see paragraph 3.3.7 for more information).
A sensor supply voltage of 8.2, 12 or 24V DC can be provided with power supply type PD.
Fig. 20: Terminal connections – PNP signal input
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