thuba PS 830 Manuel page 21

Manual BVS 19 ATEX E 080 X
3 Introduction: simplified pressurized
enclosure system
The use of simplified pressurized enclosures
allows the operation of 'non explosion protected'
devices in hazardous areas inside zone 2. The
protection type 'pressurization' is based on the
principle of maintaining a constant pressure
using air or a protective gas to prevent an explo-
sive mixture forming near the apparatus inside
the pressurized enclosure.
Generally, before start-up, the pressurized enclo-
sure 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 con-
sists of two components and the enclosure.
1. Control unit PS 830 for process control and
monitoring
2. Solenoid valve SVD.L.x or a sinter metal
throttle SD840 to control air input fed by
pressured air network
3.1 Pressurized enclosure system PS 830
The device PS 830 is the control device of a PS
830 pressurized enclosure system.
The control device PS 830 provides all neces-
sary functions to install a pressurized enclosure
system according IEC 60079-14 section 13, and
IEC 60079-2 „pzc". The PS 830 measures the
internal pressure and alarms or powers off, if the
pre-defined minimum pressure is reached. The
PS 830 can also pre purge the housing before
automatic powering on the housing. In this case
connect a digital working 2/2 way solenoid valve
to the appropriate terminals. The solenoid must
have a separate certification for zone 2.
Edition July 2020
Copyright
3 介绍：简化正压外壳系统
使用简化正压外壳允许在危险区域2操作"非爆
炸保护"装置。保护类型的"正压"是基于使用
空气或保护气体保持恒定压力的原则，以防止在
正压外壳内的设备附近形成爆炸性混合物。
一般来说，在启动之前，正压外壳肯定必须用空
气或保护气体吹扫，以吹扫任何可能在外壳内的
爆炸性混合物。 这种自动过程称为吹扫过程。
简化正压外壳系统包含两个部件和外壳。
1. 控制单元PS830用于过程控制和监测
2. 电磁阀SVD.L.x或烧结金属节流阀SD840
，以控制压力空气网络输入的空气.
3.1 正压系统PS830
该装置PS830是PS830正压外壳系统的控制装
置
控制装置PS830提供所有必要的功能，根据
IEC60079-14第13节，和IEC60079-'简化
正压pzc'安装一个正压外壳系统。 如果达到
预定义的最小压力，PS830测量内部压力和警
报或关闭电源。 在对外壳进行自动供电之前，
PS830还可以预c吹扫外壳。 在这种情况下，
将数字工作2/2路电磁阀连接到适当的终端。
电磁阀必须有一个单独的区域2认证。
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thuba Ltd., CH-4002 Basel
Switzerland