Magnescale SR27A-AZ Series, Instruction Manual

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(E)
15
SR27A-AZ Series, CH22 Series
Main components
Manufacturer Model Name Quantity
SMC Corporation AF40-A Air fi lter 1
SMC Corporation AFM40-A Mist separator 1
SMC Corporation AR40-A Regulator with 200 kPa pressure gauge 1
SMC Corporation Y400T-A Spacer assembly with L-type bracket 2
SMC Corporation KQ2S04-M5 Air nipple 1
Notes
Th e air fi lter and mist separator should incorporate a fl oat-type auto drain (NC) mechanism.
Use a drain tube with a diameter of at least 4 mm and length of 5 m or less. Set the tubes so that there is
no rising.
Tube Layout Notes
Tube arrangement
Use tubes with a bending radius of at least 15 mm and make sure that there are no sharp bends. Also, if the
tubes are laid parallel within the ducts for the electrical wiring or hydraulic tubes, be careful that the tubes
are not crushed by the movement of the ducts.
Tube length
To inject air simultaneously into multiple scales, make the tubes the same length from the distributor of
the air supply unit to each scale so that the injection air pressure is uniform for each scale.
Pressure setting and tube length for pressure reducing valve
If the air injection pressure for each scale is around 20 ±10 kPa, the air in the scale can be maintained at
a low humidity. However, setting the air injection pressure only via the pressure reducing valve will not
result in an air injection pressure of 20 ±10 kPa due to pressure losses stemming from the tube length.
Refer to graph below to determine the pressure setting of the pressure reducing valve.
Pressure redu c tion setting and tube l ength
Length of po l yurethane tube with outer diameter of 6 mm and inner diameter of 4 mm
(kPa)
(m)
P
ressur
e
setting
of
pr
essur
e
redu
c
ing
va
l
ve
0
0
5
1 0
1 5
20
25
30
35
40
1 2 3 4 5 6 7 8 9 1 0
Fig. 6-2
Th is graph illustrates the relationship between the regulator pressure setting and tube length when the air
injection pressure is 20 kPa. Th e tube length here is considered to be the length from the distributor of the
air supply unit to the scale. When the air injection pressure is 20 kPa, the air consumption amount per
scale unit is approximately 30 N /min.