Metrix 440 - Electrical Installation

Doc# 90018-031 • REV L (April 2016) Page 6 of 16
sea level does not allow heat to dissipate as readily as at lower elevaons, and the maximum
operang temperature must be de-rated by 2% per 300 meters. Thus, a switch installed at
an elevaon of 2,600 meters will have a maximum operang temperature 4% lower than
a switch installed between seal level and 2,000 meters. Refer to datasheet 1004730 for
complete specicaons.
4.9 Cable/Wiring
The method chosen to electrically connect to the switch or transducer should be mechani-
cally exible, to eliminate the measurement of vibraon of material not of interest (piping,
etc.), and provide a moisture barrier as well.
Although seal ght and other exible conduit have been used successfully, in areas of
extreme humidity or moisture it is recommended that a “SO” type cable together with a
suitable rain-ght CGB ng be used.
No stress should be possible on the wiring to the terminal block. If such protecon is not
provided by the conduit system, some form of stress relief must be installed where the wir-
ing exits the 440.
To reduce suscepbility to EMI/RFI, any signal-level wiring such as transducer, reset, lockout,
or 4-20 mA loop should ulize shielded cable in EMI-proof conduit, separate from any power
wiring. The signal-wiring conduit and power-wiring conduits can be connected at the switch
entry via a “T” ng.
4.10 Sealing
In installaons where temperature and humidity condions vary around the dew point, it is
important that the cover be evenly and rmly fastened down with the four screws provided
(model 440) or via the threaded cover (model 450).
Although the switch enclosures meet NEMA standards for water ghtness, this assumes the
cover is properly seated and wiring/conduit entrances use proper seals.
5. ELECTRICAL INSTALLATION
5.1 WiringtotheVibraonSwitch
See terminal numbering legends below. Refer also to the wiring diagrams of secon 8.
NOTE: Unless proper drains and/or poured seals are used,
conduit can allow moisture entry into the switch. Use good
installaon pracces that slope conduit away from the
switch, use drains (non-XP installaons only), and make
certain that cable jackets are not nicked or scued which might
allow moisture to wick into the switch via the conductors.