Electronic Insert Few 58 (Namur); Cable Monitoring - Endress+Hauser Liquipoint T Series Technical Information

Electronic insert FEW 58
(NAMUR)

Cable monitoring

!
8
Output signal
For connecting to isolating amplifiers acc. to NAMUR (IEC 60947-5-6)
Output signal jump from high to low current on limit (H-L-edge).
= lit
= flashes
= unlit
L00-FTL5xxxx-07-05-
xx-xx-002
Fail-safe mode
Selecting the correct fail-safe mode ensures that the relay always runs in quiescent current
fail-safe.
•
Maximum fail-safe: the output signal is < 1.0 mA when the switch point is exceeded
(probe covered), a fault occurs or the power supply fails.
•
Minimum fail-safe: the output signal is < 1.0 mA when the switch point is undershot
(probe uncovered), a fault occurs or the power supply fails.
Measuring ranges
A total of four measuring ranges (100 Ω; 1 kΩ; 10 kΩ; 100 kΩ) can be set via two DIL switches
(SENS). The setting on delivery is 100 kΩ.
MAX
MIN
SENS = 100 - 100k
Switching delay
A switching delay of 2.0 s can be activated or deactivated via a DIL switch.
If the switching delay is set to 0 s, the device switches after approx. 0.3 s.
Load
Refere to "Technical Data" date sheet of the connected isolating amplifier acc. to
NAMUR (IEC 60947-5-6)
For probes without an electronic insert, an additional printed circuit board must be installed in the
housing, which enables cable monitoring. It is always switched or connected between rod/rope
1 and 2.
Note!
When using switching units (transmitters) that do not support cable monitoring, these must be
removed.
Fail-safe Level
circuit
Max.
Min.
2 s
100 Ω
0 s
Ω Ω
1 kΩ
Liquipoint T FTW 31, FTW 32
Output signal LEDs
gn
2.2 ...
+
6.5 mA
2 1
0.4 ...
+
1.0 mA
2 1
2.2 ...
+
6.5 mA
2 1
0.4 ...
+
1.0 mA
2 1
L00-FTW3xxxx-04-05-xx-xx-006
10 kΩ
100 kΩ
L00-FTW3xxxx-15-05-xx-xx-001
Endress + Hauser
ye