WIKA WUD-26 - Handbuch (Seite 9)

11611057.01 GB/D 11/2013
9 Operating instructions/Betriebsanleitung, WUD-2x
7. Initial start-up and operation
Electrical connection
WARNING!
Connect the enclosure to ground through the process connection, against electromagnetic fields and electro-
static discharge.
■ Connect only a shielded cable to the transmitter. In case the cable length exceeds 30 m or leaving the build-
ing do not connect the cable shield to the enclosure ground of the transmitter.
■ Ensure that the cable diameter you select fits to the cable gland of the connector Ensure that the cable gland of
the mounted connector is positioned correctly and that the sealings are available and undamaged. Tighten the
threaded connection and check the correct position of the sealings in order to ensure the ingress protection
■ Cover flying leads with fine wires by an end splice (cable preparation).
■ Please make sure that the ends of cables with flying leads do not allow any ingress of moisture.
■ The pressure transducer must be connected and operated in accordance with the approriate regulations.
Take care to ensure that the electrical connection (e.g. M12 connector) is correctly made (fully sealed).
WIKA's pressure transducers are designed to operate with an input voltage of DC 10 ... 30 V for output signals 4 ... 20 mA
and 0,5 V / DC 14 ... 30 V for output signal 0 ... 10 V. The interrelationship between voltage supply and load resistor (R
A
) is
illustrated by the following diagram.
Signal output and allowed load
GB
Current output (3-wire)
4 ... 20 mA:
R
A
≤ (U+ – 10 V) / 0,02 A
Voltage output (3-wire)
0 ... 5 V: R
A
> 5 kOhm
0 ... 10 V: R
A
> 10 kOhm
with R
A
in Ohm and U
+
in Volt
permitted range
4 ... 20 mA, 3-wire
U+