EXPO MiniPurge D770/ET, Руководство пользователя

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Section 2: Quick User Guide
Installation
The MiniPurge
®
S
ystem must be installed by a competent engineer, in accordance with relevant standards, such
as IEC / EN 60079-14 and any local codes or practice.
• Mount the purge system in accordance with the hook-up drawing.
• Ensure the system is installed according to the full instructions in the “Installation of the System” section of
this manual .
• All pipings must be clean and free of dirt, condensation and debris prior to connection to the purge system or
pressurized enclosure.
• It is strongly recommended that a local isolation valve is installed on the air supply upstream of the purge
system.
Note: Most faults are due to restricted air supply, inadequate supply pipe work or drop in air supply pres-
sure during the purge process.
Operation of the System
Once the system is installed correctly, turn on the air supply. Refer to Commissioning section.
The purge system commences the purge cycle:
• The purge air will enter the enclosure.
• The pressurized enclosure will obtain a positive pressure.
• The Purge Outlet Valve will open within the Relief Valve Unit.
• The air will then exit the Relief Valve Unit housing via the spark arrestor.
Open the Purge Flow Restrictor Valve until the air flow reaches the required rate; the system will initiate the timed
purge cycle. Start a stopwatch when the purging indicator flashes yellow
On completion of an uninterrupted purge cycle of the required length, the system will indicate purge complete.
Indicator Colour Status
Alarm / Pressurized Red Low pressure alarm (enclosure pressure too low)
Purging Black Purge flow too low or not in purge mode
Indicator Colour Status
Alarm / Pressurized Green Pressurized (minimum enclosure pressure achieved)
Purging Black Purge flow too low
Indicator Colour Status
Alarm / Pressurized Green Pressurized
Purging Sequential flashing
Yellow Purge flow rate above minimum