thuba PS 830 Manuel page 17

Manual BVS 19 ATEX E 080 X
4 The inlet and the outlet of the purging gas
should be located as far away to each other
as possible.
5 The pressure lost an the solenoid valve
(P ) must not be higher than 500 mbar,
Valve
while pre-purging.
2.5 Temperature class of the Ex
pzc-housing
The installer has to define the maximum ambient
temperature and the resulting maximum temper-
ature class of the Ex pzc-housing.
To determine the temperature class, measure,
on worst conditions, the hottest point on the sur-
face of the Ex pzc-housing and recalculate it to
the maximum ambient temperature. The mini-
mum temperature class is the one of the PS 830
and its surface temperature.
If some parts inside of the housing get hotter
than the temperature class, the installer has to
determine the time in which the temperature of
those parts falls below the temperature class. He
has to place a sign on the Ex pzc-housing with
the following sentence:
Power off the apparatus and wait for X min-
utes for cool down!
X is the determinate time multiplied with a safety
factor 1.5.
2.6 Particular requirements in zone 22 (Dust
hazardous area)
2.6.1 Pre purging / cleaning of the housing
For the employment in the zone 22 the PS 830
must not initialize a pre purging phase. There-
fore, the automatic purging at the controller PS
830 has to be deactivated.
The purging phase before the start-up of the
inserted, electrical non-ex operational funds,
upstream within the gas ex range, is replaced in
the zone 22 by inside cleaning the housing.
Edition July 2020
Copyright
4. 吹扫气体的入口和出口应尽可能远离此。
5. 在进行预吹扫时， 电磁阀压力损失
(PValve )不得高于500毫巴。
2.5 防爆简化正压腔体的温度等级
安装人员必须定义防爆简化正压腔体的最大环境
温度和由此产生的最高温度等级。
为了确定温度等级，在最坏的条件下，测量防爆
简化正压腔体表面的最热点，并将其重新计算到
最高环境温度。 最小温度等级是PS830及其表
面温度之一。
如果外壳内的某些部件比温度等级更热，安装人
员必须确定这些部件的温度低于温度等级的时间
。 他必须在防爆简化正压腔体上加上以下句：
关闭设备，等待X分钟冷却
X是确定的时间乘以安全系数1.5。
2.6 在22区（粉尘危险区)的特殊要求
2.6.1 预吹扫/清洗外壳
对于区域22中的使用，PS830不能初始化预吹
扫阶段。 因此，控制器PS830的自动吹扫必须
被停用。
在嵌入，电气非防爆运行储备，气体防爆范围上
游启动之前的吹扫阶段，在22区，由内部清洁
外壳所取代。
13
thuba Ltd., CH-4002 Basel
Switzerland