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Ex p Control unit
SILAS
pz
Installation purging gas supply
Rev. 0
ATTENTION
MATERIAL DAMAGE CAUSED BY THE ABSENCE OF A PURGE GAS NOZZLE.
Due to the build-up of internal pressure, there is a risk of excessive strain on
the pressurized enclosure.
Check if the purge gas nozzle is there.
NOT ENOUGH PURGING GAS DUE TO UNDERDIMENSIONED
PURGING GAS SUPPLY LINE.
Pressurized enclosure does not go into operation due to low flow
rate.
Adjust the inner diameter of the purging gas supply line to
the required flow rate.
The purge gas supply is composed of a pressure reducer, a purge gas valve and a
purge gas nozzle. Depending on the capacity of the pressurized enclosure, the
purge gas supply is available in the sizes G1/4" or G1/2".
The following table shows a guideline value in terms of protected volumes.
Pre
Capacity
Pressure
< 50 liters
2 bar
50 to 300
2 bar
liters
300 to 700
2 bar
liters
700 to 1000
3 bar
liters
As of 1000
3 bar
liters
(The levels specified in the table are reference values and can vary.)
The pressure reducer for lowering the pressure of the supplied purge gas is
mounted on the outside of the pressurized enclosure. The purge gas valve, which
releases the purge gas, is mounted inside the pressurized enclosure. The purge
gas nozzle restricts the maximum flow of the purge gas and accordingly prevents
pressure increasing to the maximum level inside the pressurized enclosure when
a purge gas valve is defective.
The following shows the assembly of the purge gas supply. The required
assembly material is included in the scope of supply.
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Installation
Pressure
Pressure
reducer
outlet
¼"
1x
¼"
1x
¼"
1x
½"
2x
½"
2x
Purge gas
Feeding
nozzle
pipe
2.8 mm
10 mm
3.9 mm
10 mm
4.2 mm
15 mm
4.5 mm
15 mm
5.5 mm
20 mm
Page 25 of 88
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