WIKA FLM-CA Betriebsanleitung Seite 15

5. Commissioning, operation
The maximum cable length is calculated as follows:
L = Cable length in m
U = Supply voltage V (with negative tolerance value -5 %)
U = Minimum supply voltage V = 8 V
min
I = highest current supply A = 0.0215 A
max
R = Load
B
R = Cable resistance of copper cable (per m) in Ω/m with cable cross-section Q in mm²
Q
Example:
Supply voltage: 12 V (±5 %)
Supply voltage U = 11.4 V (12 V - 5 %)
Minimum supply voltage U
Highest current supply I
Load R = 86.8 Ω
B
Cable resisatance R
A cable with a forward and return line (2-wire) can therefore be a maximum of 1,000 m
long.
Operating instructions magnetostrictive level transmitter, models FLM-CA, FLM-CM
= 8 V
min
= 0.0215 A
max
= 0.0356 Ω/m with cable cross-section Q = 0.5 mm²
Q
EN
15