Pressurized Enclosure; Connecting Hose Between Sr-Unit And Junction Box - SICK GM32 Ex Operating Instructions Manual

3.8.1.2

Pressurized enclosure

3.8.2

Connecting hose between SR-unit and junction box

8015558/1O6S/V1-9/2024-08 | SICK
Subject to change without notice
Ignition protection type, pressurized enclosure for Zone 2
Purging
All relevant enclosures of the sender/receiver unit and connection unit connected
together via a pressure-proof metal hose are purged with a protective gas. This purging
before the start of the device ensures any possibly present ignitable mixture is safely
removed.
Controlling the overpressure in the enclosure
The control FS850P ensures the complete enclosure is held at an overpressure of at
least 0.8 mbar against the atmosphere after the purging which in turn ensures no
ignitable gas mixture can penetrate the enclosure.
Protective gas types
• Instrument air suctioned in from the area outside the potentially explosive atmos‐
phere
• Inert gas
More information, see "Technical data protective gas", page 90
sure Operating Instructions.
Alarm signal of the pressurized enclosure when a malfunction occurs
Ex control unit FS850S for category 3G:
Ex control unit FS850S will trigger an alarm signal when the pressurized enclosure
is not in the correct operating state (malfunction).
WARNING
Risk of explosion through incorrect parameter settings
Incorrect parameter setting can cause an explosion with fatal consequences.
Only authorized persons are allowed to change the parameters.
►
NOTICE
The operating company is responsible for the evaluation of the alarm signal. See the
Pressurized Enclosure System Manual.
The connection hose between the sender/receiver unit and the junction box
• is part of the pressurized enclosure
• contains electrical connection lines
• is under overpressure
PRODUCT DESCRIPTION
and Pressurized Enclo‐
O P E R A T I N G I N S T R U C T I O N S | GM32 Ex
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