Liquiphant FTL51B Electrical connection
Endress+Hauser 27
Behavior of switch output and signaling
MAX
RD YE GN
MIN
1
1
1
1
1
2
2
2
2
2
L+
L+
L+
L+
L+
150 Hz
50 Hz
50 Hz
150 Hz
0 Hz
L-
L-
L-
L-
L-
A0037696
28 Switching behaviour and signaling, electronic insert FEL67
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED, red, for alarm
YE LED, yellow, switch status
GN LED, green, operational status, device on
The MAX/MIN switch must be set in accordance with the application. Only then is it
possible to perform the functional test correctly.
6.2.6 2-wire NAMUR > 2.2 mA/< 1.0 mA (electronic insert FEL68)
• For connecting to isolating amplifier as per NAMUR (IEC 60947-5-6), e. g. the
Nivotester FTL325N from Endress+Hauser
• Signal transmission H-L edge 2.2 to 3.8 mA/ 0.4 to 3.8 mA as per IEC 60947-5-6
(NAMUR) on two-wire cable
• Functional testing without level change. A functional test can be performed on the
device using the test button on the electronic insert or using the test magnet with the
housing closed.
The functional test can also be triggered by interrupting the supply voltage or activated
directly from the Nivotester FTL325N.
Supply voltage
U = 8.2 V
DC
Pay attention to the following as per IEC/EN61010-1: Provide a suitable circuit
breaker for the device.
Power consumption
NAMUR IEC 60947-5-6
Behavior of output signal
• OK status: output current 2.2 to 3.8 mA
• Demand mode: output current 0.4 to 1.0 mA
• Alarm: output current 0.4 to 1.0 mA
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