BPS YZ102 IOM-R1.0 Page 3 of 14
© 2018 - Best Purging Systems Corporation
Unit Specifications
Purge Time:
4 Volumes @ 1 minute per 1.0 cf
5 Volumes @ 1 minute per 0.8 cf
Protective Gas Supply:
Air or Inert Gas
Gas Supply Pressure:
80 - 125 psi max.
Unit Supply Connection:
1/4” tube fitting
Enclosure Supply:
1/4” tube fitting
Enclosure Reference:
1/4” tube fitting
Safe Enclosure Pressure:
0.25” w.c. / 6.22 Kb
Safe Press. Flow Rate:
* 0.1 - 3.5 scfh per cf
Purge Enclosure Pressure:
* 5” - 8” w.c.
Purge Press. Flow Rate:
4 scfm @ 60 psi.
* Enclosure Integrity determines actual Pressure & Flow
Material Specifications
Unit Mounting Plate:
316 Stainless Steel Brushed
Regulator body:
Enamel Finished Zinc
Filter & Handle:
Polycarbonate
Enclosure Press. Gauge:
Enameled Aluminum
Injection Press. Gauge:
Polycarbonate/Brass
Tubing:
316 Stainless Steel
Tube Fittings:
316 Stainless Steel
Valves:
316 Stainless Steel
Valve Handles:
Polycarbonate
Start up Labels:
Silkscreened Lexan
Enclosure Warning Label:
Stainless Steel
Protected Enclosure Criteria
The consumption of protective gas is directly related to the
integrity of the protected enclosure plus the type of purge
requirements, i.e. dilution and ventilation. The following
enclosure recommendations are provided to help minimize
protective gas consumption and increase purge unit efficiency.
1. The enclosure should be fabricated to meet NEMA 4 or
12 / IP66 requirements.
2.
Non metallic enclosures should meet ANSI/UL 94 V-O
or 94 5V.
3. Enclosure windows should be impact resistant and sized
as small as possible.
4. Enclosure surface temperatures must not exceed 80%
of the area’s auto-ignition temperature.
5. Avoid obstructions and barriers which could impede
protective gas flow through the protected enclosure.
Identifying Your Unit
Major Components List
Filter Regulator:
Enclosure Pressure Valve:
Purge Valve:
Purge Press. Indicator:
Enclosure Press. Indicator:
Optional Pressure Loss Alarm:
Enclosure Warning Label:
EWL-1
General Information
All electrical connections of the protected enclosure and purge unit must be performed by trained and knowledgeable
personnel. In addition, all connections must be installed in accordance with the National Electrical Code (NEC) NFPA
70 and all relevant international, nation and local codes. The Authority Having Jurisdiction must approve all electrical
installations. Failure to follow electrical warnings can cause harm, death or dismemberment to personnel and can cause
damage to instrumentation.
WARNING
Model Number Designations
This enclosure pressurization unit is offered in various
styles. For proper installation and operation, examine
the Unit Model Number Nameplate to identify the Unit
Style, Area Classification and Type, as noted below.
Model # YZ-102-CI-L-U-
¤
Div./Zone Reduction
Y-
Div.1/Zone1 to Div. 2/Zone 2
Z-
Div.2/Zone2 to Non-Hazardous
Unit Series
102-
1/4” Purge Unit
Area Classification
CI-
Class I Areas
Pressure Switch Option
L-
Provided Less Switch
W-
Provided With CI, Gr. C&D EXP Switch
B-
Provided With CI, Gr. B EXP Switch
Voltage*
120 VAC
24 VDC
OR
Optimal Configuration***
PM-
Panel Mount
Mounting Options
U-
Universal
Mounting**
V-
Vertical
Mounting
H-
Horizontal
Mounting
* For pressure switch option “B” only
** Not Available with pressure switch options
*** Panel Mount designed to mount through the wall of protected enclosure. U mounting only.
YZ103-CI-W-V
Purge Unit
Area Classification Reduction:
Type Z -
Cl I, Div. 2/ Zone 2, Gr.
C&D, to Non-hazardous
Type Y -
Cl I, Div. 1/ Zone 1, Gr.
C&D to Div. 2/ Zone 2, Gr. C&D
Purge Control for use in Hazardous
Locations.
In accordance w ith the
National Fire Protection Association
Standard
for
Purged
and
Pressurized Enclosures for Electrical
Equipment. NFPA 496 2003.
23HP
