14
Assembly and Installation
Electrical Installation
Electrical installation to be done only by qualified professional observing all applicable
regulations. When installing the cabling, observe national regulations for the separation of
mains, low voltage and control current circuits (in Germany: VDE Regulations).
For hazardous area:
When installing, the entire wiring must meet currently valid national regulations
regarding the installation of electrical devices, and - if necessary - the national
regulations regarding the installation in potentially explosive atmospheres. In case of
doubt, the official responsible authorities are to be consulted prior to installation of the
device. Devices with a measuring function for explosion protection in accordance to
Directive 94/9/EC, Appendix II, 1.5.5 to 1.5.7, must be operated with a power supply
that do not transfer power interruptions on the primary side of up to 10 ms to the
secondary side.
— Installation using three or more wire cable 0.5 mm
2
(AWG 20) to 2.5 mm
2
(AWG 13).
Recommendation: Shielded wire, shield braiding with an average coverage of ≥80 %.
Shielding connection: Recommended only at the central device. When operating with
HART
®
communication (HART
®
operation), it may be necessary to connect the cable
shielding to the gas transmitter.
To ensure proper operation of the gas transmitter, the impedance of the 4 to 20 mA signal
loop must not exceed 500 ohms. Depending on the operating voltage and on the
application (e.g. HART
®
operation), certain minimum impedances must be observed – see
table on page 20.
The power conductors must have a sufficiently low resistance to ensure the correct supply
voltage at the gas transmitter.
CAUTION
Do not connect the device to the power supply before the wiring is complete and has been
tested. This could damage the device.
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