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32 Micro Motion 7827 Digital Viscosity Meter
Electrical Connections
4.3 Installation and safety in hazardous areas
The 7827 meter is explosive proof and can be installed in a hazardous area without the use of
intrinsically safe barriers (or isolators). However, it is still necessary to observe the rules of
compliance with current standards concerning flameproof equipment:
• The meter electronics housing covers must be tightened securely and locked into position by
their locking screws.
• The electrical conduit must be fitted with an appropriate explosion-proof cable gland.
• If any electrical conduit entry port is not used it must be blanked off using the appropriate
explosion-proof plug, with the plug entered to a depth of at least five threads.
• The spigot must be locked into place.
• The cabling used to wire the 7827 to the signal converter/flow computer must be of the
appropriate Exd rating.
4.4 Installation in non-hazardous areas
Typically the 7827 meter will operate over cable lengths up to 2 km from a 24 V supply.
Micro Motion recommend cables similar to BS 5308 or RS 368.
4.5 Wiring the meter
For installations in hazardous areas:
• For ATEX installations, the electrical installation must strictly adhere to the safety information
given in the ATEX safety instructions booklet shipped with this manual. See Section 1.1 for
important information.
• For installations in USA and Canada, the electrical installation must strictly adhere to the Electrical
Codes and a conduit seal is required within 2” (50 mm) of the enclosure.
1. Open the Terminal Board side of the
meter’s electronics housing by
undoing the grub screw and
unscrewing the lid anticlockwise.
GRUB
SCREW
UNDO THIS CAP