HF124PEN_v0501_04
Page 32
Active signals 8.1V - 12V and 24V:
If a sensor gives an active signal, please read par. 3.2.3. The detection levels are 50% of the
selected supply voltage; approximately 4V (ACT_8.1) or 6V (ACT_12) or 12V (ACT_24).
Active signal selection may well be desired in the case of power supply type PD, PF, PM being
supplied for sensor supply.
Reed-switch:
The F124-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 par. 3.2.3.)
NAMUR-signal:
The F124-P is suitable for flowmeters with an Namur signal. The standard F124-P is not able to
power the Namur sensor, as an external power supply for the sensor is required. However, a 8.2V
sensor supply voltage (terminal 11) can be provided with power supply type PD, PF, PM.
INTERNAL
EXTERNAL
Namur signal input
10
Common ground unit
SIGNAL
9
GND
shielding
Namur
820 Ohm
11
(Type PD, PF, PM: +8.1V)
+8.1V DC
INTERNAL
EXTERNAL
Active signal input
10
Common ground unit
SIGNAL
9
GND
shielding
11
+3.2V DC (type PD, PF, PM: 8.1V, 12V, 24V)
Resistance value:
see signal selection