Siemens SITRANS LG250 Operating Instructions Manual

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13PBD-51041048 SITRANS LG250 - Operating Instructions44277-EN-2002124 Mounting4.1 General instructionsOn devices with a threaded fitting, the hexagon on the process fittingmust be tightened with a suitable wrench.See chapter "Dimensions" for wrench size.Warning:The housing or the electrical connection may not be used for screw-ing in! Depending on the device version, tightening can cause dam-age, e. g. to the rotation mechanism of the housing.Protect your instrument against moisture ingress through the followingmeasures:• Use a suitable connection cable (see chapter "Connecting topower supply")• Tighten the cable gland or plug connector• Lead the connection cable downward in front of the cable entry orplug connectorThis applies mainly to outdoor installations, in areas where highhumidity is expected (e.g. through cleaning processes) and on cooledor heated vessels.Note:Make sure that the degree of contamination specified in chapter"Technical data" meets the existing ambient conditions.Note:Make sure that during installation or maintenance no moisture or dirtcan get inside the instrument.To maintain the housing protection, make sure that the housing lid isclosed during operation and locked, if necessary.Metric threadsIn the case of instrument housings with metric thread, the cableglands are screwed in at the factory. They are sealed with plasticplugs as transport protection.You have to remove these plugs before electrical connection.NPT threadIn the case of instrument housings with self-sealing NPT threads, it isnot possible to have the cable entries screwed in at the factory. Thefree openings for the cable glands are therefore covered with red dustprotection caps as transport protection. The dust protection caps donot provide sufficient protection against moisture.Prior to setup you have to replace these protective caps with ap-proved cable glands or close the openings with suitable blind plugs.Note:For safety reasons, the instrument must only be operated within thepermissible process conditions. You can find detailed information onScrewing inProtection against mois-tureCable glandsProcess conditions