SICK LFV 310 Sicherheitshinweise Seite 20

rately certified cable gland or the temperature classes of the electronics determines the maximum
permissible ambient temperature on the housing.
8 Potential equalisation
The LFV 310.D*********, LFV 330.D********* have to be connected to the potential equalisation, for
example via the external earth terminal on the housing.
Make sure that you connect a ground cable. For external grounding, use M5 Crimp connec-
tions(> 4 mm ) with spring, lock washer and clamp bracket to avoid loosening and turning.
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The ground cable (AWG12) should be dismantled at the end over a length of 10 mm and fastened to
the M5 Crimp connection (with a suitable Crimp tool).
9 Mechanical fixing
LFV 330.D must be mounted in such a way that it is effectively secured against oscillation.
10 Material resistance
The LFV 310.D*********, LFV 330.D********* must only be used in media against which the materials
of the wetted parts are sufficiently resistant.
The min. fatigue strength of the vibrating element is 8.6 x 10
of 7.5 µm. The lifetime is minimum 20 years.
11 Ignition protection type flameproof enclosure Ex "d"
The terminals for connecting to the operating voltage, i.e. signal circuits, are integrated in a compart-
ment according to protection type flameproof enclosure "d".
The gaps between housing and cover as well as between threaded fitting and container are ignition-
proof gaps.
The flameproof joints are not intended to be repaired.
The joint surfaces are not coated with paint or are not powder coated.
The "Ex-d" connection compartment is provided with a M20 x 1.5 or ½-14 NPT thread for con-
necting to a certified "Conduit" system or for mounting an "Ex-d" cable entry certified according to
EN 60079-1. Cable entries of simple construction may not be used. Please take note of section 13.1
and 13.2 of EN 60079-1. When connecting to a "Conduit" system, the associated sealing facility
must be located directly on the "Ex-d" connection compartment.
A certified "Ex-d" cable gland can optionally by supplied with the delivery. It is suitable for insertion
of armoured or unarmoured cables depending on the ordered version. The instructions in the docu-
ment accompanying the respective cable entry must be observed. The "Ex-d" cable entry must be
screwed tightly into the housing. The supplied cable entry is suitable for the housing temperature
range mentioned in the LFV 310.D*********, LFV 330.D********* specification. If a different cable
entry is used (suitable Ex d certified cable glands and blind plugs should be used) , the separately
certified cable entry (e.g. cable gland or cover elements) or the temperature classes on the electron-
ics determines the maximum permissible ambient temperature range -40 ... +70 °C on the housing.
With ambient temperatures > 60 °C, cables with a temperature resistance of at least 92 °C should
be used.
The factory-installed screw plug or blind plug (depending on the type ordered) is part of the "Ex-d"
housing. If a screw plug type other than the factory-installed screw plug or the one with article num-
ber 2.30690 is used, it must be suitable for the function and certified according to EN 60079-1.
Before opening the lid of a "Ex-d" compartment or in case it is already open (e. g. during connection
or service work), make sure that either the supply cable is completely voltage free or no explosive
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load changes with a max. amplitude
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LFV 310, 330