Mitutoyo AT211 - 4.5 Air Purging

34
4Specication
No. 99MBE011A
4.5
Air Purging
There is a method to improve environmental resistance (coolant resistance, dust resistance) of as-
sembly type linear scale by supplying clean compressed air into the scale main unit. Set up pipe to
one of the M5 screw holes on both sides of the scale main unit and supply compressed air.
Tips
• Air purging can be performed for a scale unit that is xed at multiple points.
• Air supply is an auxiliary method for cleaning inside the scale main unit.
• For air supply, mounting posture is important. Follow the instructions in this manual.
• When supplying air, it is necessary to periodically replace the air lter due to the contamination of the air
source. If you continue to use the dirty lter, dirt will enter the scale and cause trouble, so pay attention to
this issue.
4.5.1 Input Air Specication
The table below shows the input air specication.
This specication corresponds to ISO8573-1 Class 1.4.1.
Item Specication
Maximum particle diam-
eter (μm)
0.1
Lowest pressure dew
point (°C)
+3
Oil concentration (mg/
m
3
)
0.01
4.5.2 Air Flow Supplied to the Scale
Supply air of 10 L/min—20 L/min per scale axis.
Air should slightly come out from the closed part of the dust-proof rubber lips.
Adjust the air ow referring to the table below.
Conditions Airowrate
Using Mitutoyo's xed dia-
phragm (ID: ø0.9)
Make adjustment with the air pressure, so that the air ow becomes 10
L/min—20 L/min (per scale unit).
Reference values when supplying air to one axis are as follows.
y If air pressure is 0.1 MPa: Approx. 12.7 L/min
y If air pressure is 0.2 MPa: Approx. 19 L/min
Using other xed dia-
phragms
Make adjustment with the air pressure, so that the air ow becomes 10
L/min—20 L/min (per scale unit).
For information on the air ow and pressure relationships, refer to the
ow characteristics (ID of the xed diaphragm and ow-pressure rela-
tions) provided by each pneumatic component manufacturer.