HF126PEN_EG_IA_TP_v0501_04
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Terminal 09-11; Flowmeter input
:
Three basic types of flowmeter signals can be connected to the unit: pulse, active pulse or sine-
wave (coil). The screen of the signal wire must be connected to the common ground terminal 09
(unless earthed at the sensor itself).
The maximum input frequency is approximately 10 kHz (depending on the type of signal). The input
signal type has to be selected with the correct SETUP-function (read par. 3.2.3.)
Sine-wave signal (Coil)
:
The F126-P is suitable for use with flowmeters which have a coil output signal. Two sensitivity levels
can be selected with the SETUP-function:
COIL LO: sensitivity from about 120mVp-p.
COIL HI: sensitivity from about 20mVp-p.
Type ZF offers for setting COIL HI : sensitivity from about 10mVp-p.
Type ZG offers for setting COIL HI : sensitivity from about 5mVp-p.
Pulse-signal NPN / NPN-LP:
The F126-P is suitable for use with flowmeters which have a NPN output signal. For reliable pulse
detection, the pulse amplitude has to go below 1.2V. Signal setting NPN-LP employs a low-pass
signal noise filter, which limits the maximum input frequency - read par. 3.2.3.