Endress+Hauser Liquiphant FTL51B Operating Instructions Manual page 39

Liquiphant FTL51B
Endress+Hauser
MAX
MIN
RD GN
1.
>1 s
2.
3.
A Once the test button has been pressed, the current is 0.6 to 1 mA for at least 10 seconds, also if the button is
pressed for < 10 seconds. If the button is pressed for > 10 seconds, the current remains at 0.6 to 1 mA until
the test button is released. After this, the current is 2.2 to 3.5 mA again.
Pay attention to the information in the Safety Manual for proof-testing in safety
equipment in accordance with SIL.
Functional test of the electronic switch with a test magnet
With the test magnet, it is possible to perform the functional test without opening the
device.
To do this, hold the test magnet against the marking on the nameplate.
It is possible to simulate a functional test from the outside using a magnet with the
following device versions: FEL62, FEL64, FEL64DC, FEL68
During the test, the current state of the electronic switch is reversed.
1. Make sure no undesired switching processes are triggered!
2. Wet approach (change the level or removal/installation with medium with a similar
density and viscosity) with PTC ≥ 97%
3. Check the switch point (removal/installation with water under reference operating
conditions) with PTC ≥ 97%
4. Simulation (externally on the device or at switching unit) with PTC ≥ 50%.
5. If the functional test has been activated by simulation, this is indicated by the three
LEDs (red, yellow and green) lighting up one after the other (chaser light).
6. Hold the test magnet against the marking on the nameplate on the outside.
 The switch status is changed.
The red and green LED flash alternately.
The device switches to the normal operational state after ~2 s.
YE
2.2 ... 3.5 mA
+ 2 1
0.6 ... 1 mA
+ 2 1
A
+ 2 1
Operation options
RD GN YE
0.6 ... 1 mA
+ 2
0.6 ... 1 mA
+ 2
0.6 ... 1 mA
+ 2
1
1
1
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