EN
14365216.02 08/2020 EN/DE
Operating instructions magnetostrictive level transmitter, models FLM-CA, FLM-CM
14
5.2 Electrical connection
5.2.1 Connection diagram
▶
Connection of the cable, see chapter 5.2.3 “Wiring with cable gland” and 5.2.4 “Wiring
Voltage source U
max
= DC 30 V
Minimum supply voltage U
min
= 8 V
Overall resistance (incl. wiring resistance and load): ΣR = (U - U
min
) / 0.0215 A
5.2.2 Cable length
The maximum cable length is dependent upon the overall resistance, which is composed
of the wiring resistance and the load of connected instruments (see chapter 5.2.1
The cable (length and cross-section) must be selected such that, in the event of the
highest current supply (21.5 mA), the voltage does not drop below the probe-specific
minimum supply voltage (8 V).
Maximum overall resistance with different supply voltages and also cable resistances at
different cross-sections:
Supply
voltage in V
Max. overall
resistance in Ω
Cable cross-
section in mm²
Cable resistance per m
of copper cable in Ω/m
12 (-5 %)
158
0.5
0.0356
1.0
0.0178
1.5
0.0119
24 (-5 %)
688
0.5
0.0356
1.0
0.0178
1.5
0.0119
Voltage source
Load
Wiring resistance
5. Commissioning, operation
