30 DF-310E Options
Figure 16: Remote Display Wiring
5.18Case Purge
NOTE: The case purge option is available on AC powered analyzers only.
The DF-310E analyzer can be equipped with an inert gas (nitrogen) purge
system. The purge system provides improved protection against an explosion
hazard by purging the enclosure to a concentration level below the lower
explosive limit.
With a 10 scfh flow, the nitrogen purge system provides a minimum of thirty
volume changes per hour of the atmosphere inside the analyzer’s enclosure. A
low-flow switch controls the failsafe feature. AC power is connected to the
analyzer through the purge control as long as the low-flow switch contacts are
closed. In the event of a partial or full loss of purge gas flow, the low-flow
switch opens causing a hermetically sealed relay to disconnect power to the
analyzer.
The electrical and purge gas connections are at the rear of the analyzer. The
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