• However, if you cannot use these wiring harnesses or wish to
install an external reset button, it is then necessary to open the
enclosure and wire to the internal connectors.
All Ultima Gas Monitors are rated explosion-proof, certified for
Classification I, Groups B, C and D, Division I Hazardous
Locations. When using this unit in these hazardous locations,
follow all local codes and practices.
"
CAUTION
Any Ultima Gas Monitor that has the Internal Relay option
selected cannot be installed as Intrinsically Safe.
IMPORTANT NOTE: Some Ultima Gas Monitor models are
housed in explosion-proof enclosures and can be used in
hazardous atmospheres.
• These models must be installed according to the National
Electric Code.
• Some Ultima Gas Monitor enclosures are rated for Class I,
Division 1, Groups B, C and D areas while others can only be
used in Groups C and D areas.
• The larger metal Approval Label on the Ultima Gas Monitor
(FIGURE 1-7) indicates if your particular model is approved for
use in hazardous areas and identifies its rating.
Unpacking, Mounting and Wiring the Ultima Gas
Monitor with Internal Relays
Unpack, mount and wire the Ultima Gas Monitor according to
Chapter 1, "Set-up." All electrical connections to the Ultima Gas
Monitor can be made via the clearly marked factory-installed
wiring harnesses.
• See FIGURE C-1 for a Dual module Ultima Gas Monitor.
• See FIGURE C-2 for a Single module Ultima Gas Monitor.
• See Ultima Controller instruction manual (P/N 813379) for
complete configuration information.
Power cable wiring lengths for the Ultima Gas Monitor with
internal relays differ from models without internal relays
(TABLE C-1).
NOTE: To avoid electrical noise problems, do not run
AC lines from relays in the same conduit as the
DC Signal lines.
Appendix C, Internal Relay Option
C-3
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