Endress+Hauser Liquiphant FTL51B Operating Instructions Manual page 38

Operation options
38
A fixed density setting of 0.4 can be ordered as an option. It is not possible to change this
setting subsequently.
Functional test using the button on the electronic insert
• When the test button is pressed, the output switches to the safety-oriented state and the
device performs a self-test.
• The test is completed after approx. 10 seconds and the device switches back to the
normal operating mode if it passes the internal test.
• The LEDs flash one after another as a chaser light during the functional test.
• The functional test can only be performed when the device is in the "OK" state
• If the housing cannot be opened during operation due to explosion protection
requirements, for example, (e.g. EX d /XP), the functional test can also be performed
from the outside using the test magnet (FEL61, FEL62, FEL64/DC, FEL68). In the case
of Nivotester FTL325P/N, the functional test for the PFM (FEL67) and Namur (FEL68)
electronics can be started from the control room.
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 (internally or at switching unit) with PTC ≥ 50%.
5. If the proof-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. Press the button marked "T" on the electronic insert for at least 3 seconds (e.g. with a
screwdriver).
 The red and green LED flash alternately.
The device switches to the normal operational state after ~2 s.
Sample visualization with NAMUR electronics:
MAX >0,7
COM
>0,5
L1 N
U 19...253 V AC ~ ~
I max: 350 mA
MIN
MAX >0,7
COM
>0,5
1
MIN
1
2 2
Liquiphant FTL51B
A0037132
Endress+Hauser