Network Meter Block Installation, Operation, & Maintenance Manual
Introduction 3
• Ensure the conduit port on the back of the instrument housing is closed with the factory-provided
¾-inch NPT plug.
• Retain the factory-provided vapor desiccant sack, which should be secured with double-sided tape
inside the housing.
• Keep the cover mounted to the instrument housing to protect the electronics.
• If your NMB is installed, but is awaiting start-up or commissioning, use the following guidelines to
protect your unit:
• Use a conduit seal-off fitting based on applicable electrical codes.
• Do not leave the unit installed with an open seal-off fitting or cover removed.
1.5 Warnings and Precautions
Before you begin, please read all of the following warnings and cautions to reduce the risk of injury,
equipment damage, or malfunction.
1.5.1 Configuration
The NMB is shipped from the factory in a completely initialized state and must be properly configured for
the specific installation prior to operation. The unit will not operate properly until the configuration is
completed. Configuration parameters can be set using a personal computer’s (PC) Web browser via the
Web browser interface.
1.5.2 Hazardous Locations
Some models are approved for use in an explosive environment (Class I, Division 1, Groups C and D and
Zone 1 Ex d ia, IIB Gb), but specific installation methods are required to produce a comprehensive
explosion-proof system. This manual only provides guidance for the installation of the NMB and using its
firmware. In general, keeping the front cover closed in accordance with the instructions is key to
maintaining explosion protection, along with following all local installation codes and requirements.
1.5.2.1 Precautions in Hazardous Locations
Note that when operating the NMB in hazardous locations, special care must be taken with shielding
termination to ensure signal integrity (see Section 3.2.5: Typical Wiring Diagrams for more information).
ATEX-approved installations have special requirements; see Section 3.2.3: ATEX and IECEx Zone 1
Installations and Section 3.2.4: ATEX and IECEx Zone 2 Installations for details.
To ensure the correct operation, see Section 3.2.5: Typical Wiring Diagrams for field input/output wiring
diagrams.
Any modification of the instrument housing invalidates the hazardous location rating of the NMB. For
example, do not drill or machine the housing.
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