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24 Micro Motion 7829 Viscomaster
®
and Viscomaster Dynamic
™
Viscosity Meters
Electrical Connections
Another method of surge protection is to connect an MOV (Metal Oxide Varistor) (breakdown voltage
>30 V) with an NE-2 neon bulb in parallel across each wire and ground. These can be mounted in a
junction box close to the meter.
If the RS-485/Modbus output is permanently connected to a PC, an independently powered, fully
isolated RS-485 to RS-232 converter should be used. (See the Further information on RS-485 section
for details).
3.2.6 Installation in explosive areas
The meter is an explosion-proof and flameproof device. However, it is essential to observe the rules
of compliance with current standards concerning flameproof equipment:
• Electronics housing caps should be tightened securely and locked in position by their locking
screws.
• The electrical cable or conduit should have an appropriate explosion-proof cable gland fitted.
• If any electrical conduit entry port is not used, it should be blanked off using the appropriate
explosion-proof blanking plug, with the plug entered to a depth of at least five threads.
• The spigot must be locked in place.
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.