Gönnheimer
Elektronic GmbH

Simplified
Pressurized
Enclosure system

(Zone 2)

F840

According to EN 60079 – 2 (pz)
Test No.
TÜV 03 ATEX 2095 X

Properties of the Ex pz- System
Very compact system, mounting direct in
hazardous area (Zone 2) or inside Ex pzhousing
ATEX- Certification according to EN 60079 –
2 (pz), TÜV 03 ATEX 2095X
II 3 G, Ex nAC [pz] IIC T6 Gc
II 3 D, Ex t [pD] IIIC T70°C Dc IP54 (Dust Ex)
Programmable automatic pre- purging, output
for solenoid valve
Two free programmable output relay contacts
(250V / 5A)
Proportional working pressure measurement,
high overpressure safety (no membrane
switch)
Visualisation of status, pressure, remaining
purge time and failure report via integrated
Display
Available languages: German, English,
French, Spanish, Dutch
Solenoid valve fuse easy exchangeable inside of FS840
Integrated spark and particle barrier
User is able to build up pressurized enclosure
system on his own regarding the operation
manual (no additional test report of notified
body necessary)

Description
The use of simplified pressurized enclosures
allows the operation of ‘non explosion protected’ devices in hazardous areas inside
zone 2. The protection type ‘pressurisation’ is
based on the principle of maintaining a constant pressure using air or a protective gas to
prevent an explosive mixture forming near the
apparatus inside the pressurized enclosure.
Generally before start-up, the pressurized enclosure must be purged with air or protective

gas to remove any explosive mixture that may
be inside the enclosure. This automatic procedure is called purging process.
A simplified pressurized enclosure system
consists of two components and the enclosure.
1.

control unit FS840 for process control
and monitoring

2.

Sinter metal throttle SD840 to control
air input fed by pressured air network

See manual F840 for requirements of pressurized enclosure and integrated ignition capable
apparatus.
If the operator is not sure, that the atmosphere
inside of the enclosure and the appropriate
pipe infrastructure is below 25% of the lower
explosive limit (LEL) (EN 60079 – 14 chapter
13.4), the enclosure must be purged to
achieve a safe atmosphere inside of the enclosure.
The F840 system can purge the enclosure
automatically using the solenoid valve SVD.L
In this case the SVD.L replaces the sinter
metal throttle.