User Manual
E018-P
Page 48
FW_E018-P_M_v0301-01_EN
6.4.11 TERMINALS E1-E2: EXTERNAL RESET WITH CLEAR-LOCK - TYPE IB
Use this function to reset the total to zero with an external switch (pushbutton). The total resets the
moment a falling edge is detected (the moment the switch closes).
To disable the ”Clear Total”-function of the optical keys, keep this input closed.
Make sure the contact resistance of the switch is less than 0.8 V@2uA = 400 kOhm. A reset pulse
should last for at least 100 ms. The input must be switched with a normally open contact to GND.
R
3V
E1
┴
E2
Common system ground
MEM
Fig. 38:
Terminals E1-E2: External reset
6.4.12 TERMINALS A1-A2: ISOLATED ANALOG OUTPUT – TYPE AH
The flowrate proportional output (AH) is standard available. This output is an isolated 4-20 mA
output with the possibility to power the device via the 4-20 mA loop. It is non-polarity sensitive.
When the output is disabled, the current is by default limited to 2 mA. Max. driving capacity
1000 Ohm @ 27 VDC. If only powered by the loop, the backlight will not be activated.
The total loop resistance may not exceed 1000 Ohm and may not be less than 330 Ohm (at 30 mA).
This means that the total resistance of other loop-devices may not exceed 670 Ohm.
A1
A2
+
10-27V DC
mA
mA
MEM
Fig. 39:
Terminals A1-A2: Analog output
Terminals A1-A2: HART Communication – Type CR
The E018-P is suitable for connecting a HART master device. This HART master device is
connected to Terminal A1 or Terminal A2 to enable HART communication with the unit.
Optionally, a HART communicator can be connected in the loop as well, provided that a suitable
resistance is inserted in the loop.
A1
A2
+
10-27V DC
mA
MEM