Downstream Filtration System (Mc, Par, Sub, Pf, Cha); Filters Definition - MIL'S SEC A Manual De Operación Y Mantenimiento

With the 4 minutes end, the cylinders B (A)* are pressurised in a progressive way during 1 minute
adjustable. The valve R4 (R2) * becomes non-busy and the air of pressurisation flow is provided by the
nozzle E2 (E1). The value of the pressure gauge M2 (M1) * goes from 0.5 bar to the operating pressure.
The function of cylinders 'A' and 'B' is inverted at the end of the 5 minutes cycle approximately.
The request or the continuation of the cycles is launched by the closing of terminals 14 - 15.
The request to stop the cycles is caused by the opening of terminals 14 - 15: this opening of the terminals
(14 - 15) does not stop a cycle, but makes it possible to finish the cycle in progress and not to start again
another of them.
With a dry contact on the terminals (14 – 15), the dryer operation can be controlled by the compressor
operation. A 'U' link on the terminals (14 – 16) allows the dryer operation.
If the storage of air is downstream from the dryer, in order to ensure the air supply for regeneration and
pressurisation, when the compressor is off, this air flow is taken downstream from the dryer by the nozzles
E1 or E2.
2.2.3.

Downstream filtration system (MC, PAR, SUB, PF, CHA)

The air at the dryer outlet goes through the downstream filtration system, and is free of any liquid
contamination.
The definition of the downstream filtration system depends on the completion of the dryer:
SEC A SEC 1A SEC 2A
None PF PF + SUB
2.2.4.

Filters definition

PF : Pre-filter: 1 µm maxi for solid and liquid particles (water and oil).
Maximum content of residual oil (aerosol): 0.5 mg / m³ @ 21°C.
SUB : Sub-micronic filter: 0.01 µm maxi for solid and liquid particles (water and oil).
Maximum content of residual oil (aerosol) : 0.01 mg / m³ @ 21°C.
PAR : Dust filtration of high efficiency to 0.01 µm.
MC : Carbon monoxide filter. It's a catalyst which transforms the CO into CO
CHA : Activated carbon filter for air without smell.
518718-12
SEC A / 1A / 2A / 7OX / 7HC –AD 5xxx
SEC 7OX & SEC 7HC
CHA
PAR : delivered separately for wall fixation
particles.
2
A in service
and B in regeneration / pressurisation
M1 M2
C1 C2
A
B
E1 E2
OPERATION
S
t = 0.5 second
R2 R4
V1 V3
M1 M2
C1 C2
A
B
E1 E2
REGENERATION
S
t = 4 minutes
(240 seconds)
R2 R4
V1 V3
M1 M2
C1 C2
A
B
E1 E2
PRESSURISATION
S
(60 seconds)
R2 R4
V1 V3
NO YES
OPERATION
REQUEST
A in regeneration / pressurisation
and B in service
M1
C1 C2
A
B
E1 E2
S
R2 R4
V1 V3
M1
C1 C2
A B
E1 E2
S
R2 R4
V1 V3
M1
C1 C2
A
B
E1 E2
t = 1 minute
S
R2 R4
V1 V3
Standby
YES NO
OPERATION
REQUEST
11
M2
M2
M2