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Quick Start Guide
Unused entries have to be closed with suitably rated stopping (blanking)
plugs.
Where available, the factory-provided parts must be used.
The diameter of the field wiring cable must match the clamping range of the
cable clamp.
If factory-provided parts are not used, the following must be ensured:
•
The parts must have an approval adequate to the approval of the level
sensor (certificate and type of protection).
•
The approved temperature range must be between the minimum
ambient temperature of the level sensor and the maximum ambient
temperature of the level sensor increased by 10 K.
•
The parts must be mounted according to the instructions of the
manufacturer.
3.1.9
Conduit system
When a threaded conduit system is used instead of a cable gland, the
regulations of the country must be observed. The conduit must have a ½-in.
NPT tapered thread to match a NPT threaded conduit entry of the level
switch and comply with ANSI B 1.20.1. Unused conduit entries must be
closed tightly with a metal stopping (blanking) plug.
Conduit system for FM
The regulations of the country must be observed. The flameproof seals and
stopping (blanking) plugs must have an adequate type approval and a
temperature range of at least -40 to 176 °F (–40 to +80 °C). In addition, they
must be suitable for the conditions and correctly installed. Where available,
the original provided parts of the manufacturer must be used.
Installation with a conduit system in a hazardous area
In a conduit system, single electric conductors are installed in a certified pipe
system. This pipe system must also have a flameproof or explosion-proof
construction.
For ATEX and IECEx approvals, both enclosure of the level switch and pipe
system need to be isolated from each other by using a certified flameproof
or explosion-proof seal. The seal must be installed directly in, or at, the
conduit entries of the level switch. Unused conduit entries must be sealed
using suitably certified blanking elements (stopping plugs).
For FM approval, both enclosure of the level switch and pipe system need to
be isolated from each other by using a certified flameproof seal. The seal
must be installed within 18 inches of the enclosure wall. Unused conduit
entries must be sealed using suitably certified blanking elements (stopping
plugs).
16
October 2020
Quick Start Guide
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