Endress+Hauser Waterpilot FMX11, Operating Instructions Manual

Page: 16 / 28

Electrical connection Waterpilot FMX11
16 Hauser
Extension cable
• Total outer diameter: 6 mm (0.24 in) ±0.2 mm (0.01 in)
• PA pressure compensation tube:
- Outer diameter 2.5 mm (0.1 in)
- Internal diameter 1.5 mm (0.06 in)
- Pressure compensation element outer diameter 6 mm (0.24 in)
The extension cables are shielded.
Cross-section
2 x 0.22 mm 2 + pressure compensation tube
Cable resistance
Per wire: ≤0.09 Ω/m
6.2.3 Power consumption
≤ 0.62 W at 28 V
DC
6.2.4 Current consumption
Max. current consumption: ≤ 22 mA
Min. current consumption: ≥ 2 mA
6.2.5 Maximum load
The maximum load resistance depends on the supply voltage (U) and must be determined
individually for each current loop, see formula and diagram. The total resistance resulting
from the resistances of the connected devices, the connecting cable and, where applicable,
the resistance of the extension cable may not exceed the load resistance value. Load
diagram for an approximate calculation of the load resistance. Additional resistances, such
as the resistance of the extension cable (per wire ≤0.09 Ω/m), have to be subtracted from
the value calculated as shown in the equation.
RLmax
– 2 × 0.09 × L – R
ZU
U – 8 V
22 mA
W
m
£
318
545
91
909
28 15 20 8 10
773
25
R
[ ]
W
U
[V]
A0043461
R
Lmax
Max. load resistance [Ω]
R
add
Additional resistances such as resistance of evaluating device and/or display unit, cable resistance [Ω]
U Supply voltage [V]
L Basic length, extension cable [m]