Intrinsically Safe Rating
Some models of the Ultima Gas Monitor can be used in
hazardous atmospheres as intrinsically safe and must be installed
according to the National Electric Code and the appropriate
control drawings. Intrinsically safe installations of the Ultima Gas
Monitor require the use of electrical barriers which are available
from MSA. The proper use of these electrical barriers are outlined
on the appropriate control drawings. Select the control drawing
(available from MSA (1-800-MSA-INST) applicable to your unit:
ULTIMA GAS MONITOR CONTROL DRAWING
Toxic or oxygen models, Milliamp or Frequency output
DSK3098-11
Combustible catalytic type model, Milliamp or Frequency output
DSK3098-13
"
WARNING
Do not use an intrinsically safe Ultima Gas Monitor with its
electrical barriers beyond its area classification ratings;
otherwise, an explosion may occur.
Refer to the larger, metal Approval Label located on the main
enclosure of the Ultima Gas Monitor (FIGURE 1-7) for rating
information. 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.
All intrinsically safe Ultima Gas Monitors operate at 12 volts only.
The Multiplex and the Digital Output models are not capable of
operating in an intrinsically safe manner with any type of
electrical barrier.
If options such as internal relays are installed or accessories
such as the Remote Relay Module or the Autocal Module are
used, the Ultima Gas Monitor will not be rated as Intrinsically
Safe. Refer to the metal Approval Label (FIGURE 1-7).
Figure 1-8.
Cable Grip for General-Purpose or Intrinsically Safe Installations
Chapter 1, Set-up
1-6
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