HART E018-P, User Manual, Page: 45 / 64

E018-P User Manual
FW_E018-P_M_v0301-01_EN Page 45
With Type OR:
● Use power supply terminals P5-P6.
● The required supply voltage is 24 – 27 VDC.
● Be sure that the output frequency does not exceed 0.5 Hz, else the relay lifetime and reliability
will be reduced significantly.
● The output functionality of digital outputs D5 and D6 corresponds to the functionality of digital
outputs D3 and D4 (respectively).
● When retransmit mode is selected, the relays are not activated.
6.4.10 TERMINALS S1-S3: 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 (unless
earthed at the sensor itself).
The sensor output should match with the selected flowmeter setting assigned in
SETUP 5:
FLOWMETER [»25]
.
Sine-wave signal (Coil)
The unit can be used with flowmeters which have a coil output signal. Two sensitivity levels can be
selected (see
SETUP 5.1: FLOWMETER > SIGNAL [»25]
):
● COIL LO: sensitivity 90 mVpp.
● COIL HI: sensitivity 20 mVpp. (type ZF offers sensitivity 10 mVpp; type ZG offers sensitivity 5
mVpp).
S2
Common system ground
S3
┴
V : 1.2V
S1
↓
+
ref
+
-
MEM
Fig. 32:
Terminals S1-S3: Coil signal input
Pulse-signal NPN / NPN-LP
The unit is suitable for use with flowmeters which have a NPN output signal:
● For reliable pulse detection under all circumstances, the signal should be above 1.4 V or below
1.0 V.
● Preferably use a sensor which is normally open and briefly closed (less power consumption).
● For better noise immunity (and if no high sensor input frequencies are expected), select signal
setting NPN-LP – low-pass signal noise filter which limits the maximum input frequency and
avoids pulse bounce (see
SETUP 5.1: FLOWMETER > SIGNAL [»25]
).
S2
Common system ground
S3
NPN-LP*
┴
R
3V
S1
NPN-LP*
R
MEM
Fig. 33:
Terminals S1-S2: Pulse signal input NPN