Optical Scientific Inc
OFS 2000CW User’s Guide
P/N 1910-905
Rev. 03/28/13
25
Type Z applications reduce
the hazardous location
rating inside the enclosure
from Division 2/ Zone 2 to
non-hazardous. This
allows general purpose
equipment to operate in
Division 2/ Zone 2 areas.
This unit is designed to
meet or exceed NEC -
NFPA 70, NFPA 496, EN
50016 and IEC 60079-02
requirements
Two Z-Purge control units
are required
– One for TX
and RX units and one for
the control box.
Figure 3.15 Typical Z-Purge Control Unit
When the Z-Purge option
is ordered, the OFS is
shipped with vents and air
fittings installed as shown
in the figures. A single Z-
Purge control unit serves
both TX and RX
enclosures, with a tubing
branch connecting them.
The supply air (or gas)
should be routed to the
unvented enclosure. The
reference (or return) line
should be routed back to
the controller from the
vented enclosure.
All Z-Purge systems MUST
be equipped with purge
vents.
Figure 3.16 TX/RX Z-Purge Arrangement
!CAUTION!
All Z-Purge systems MUST be equipped with purge vents