Product Information

DA 400Compressed-Air Filter System

December 2016

DA 400 compressed-air filter system

Sealing air
The sealed linear and angle encoders
from HEIDENHAIN can be operated withsealing air to increase the level of protection.
This offers additional defense against
contamination. The compressed air, acting
as sealing air, introduced directly into theencoders must be cleaned by a microfilter
and must comply with at least the following
purity classes as per DIN/ISO 8573-1 (2010edition):• Solid contaminants:
Particle size

Class 1
No. of particles
per m30.1 µm to 0.5 µm 20 0000.5 µm to 1.0 µm
 400
1.0 µm to 5.0 µm
 10• Max. pressure dew point: Class 4(pressure dew point at 3 °C)• Total oil content:
Class 1
(max. oil concentration: 0.01 mg/m3)

For optimum supply of sealing air to theencoders, the required air flow is 7 L/min
to 10 L/min per linear encoder or 1 L/min
to 4 L/min per angle encoder. Ideally theair flow is regulated by the HEIDENHAIN
connecting pieces with integrated throttle(see Accessories). At an inlet pressure ofapprox. 1 · 105 Pa (1 bar), the throttles
ensure the prescribed volume of airflow.
DA 400HEIDENHAIN offers the DA 400
compressed-air filter system for purifying
the compressed air. It is designed
specifically for the introduction ofcompressed air into encoders.
The DA 400 has special filters which
ensure that the quality of the filtered air
remains constant even at low airflows.
It is extremely tolerant towards suddenchanges in pressure in the air supply, suchas can be caused by other consumers in
the machine being switched on or off.

The DA 400 consists of three filter stages(prefilter, fine filter and activated carbonfilter) and a pressure regulator with pressuregauge. The pressure gauge and the pressure
switch (which is available as an accessory)
effectively monitor the sealing air.
The compressed air introduced into theDA 400 must fulfill the requirements of thefollowing purity classes as per ISO 8573-1(2010 edition):• Solid contaminants:
Particle size

Class 5
No. of particles
per m30.1 µm to 0.5 µm
Not specified
0.5 µm to 1.0 µm
Not specified
1.0 µm to 5.0 µm
 100 000
• Max. pressure dew point: Class 6(pressure dew point at 10 °C)• Total oil content:
Class 4(max. oil concentration: 5 mg/m3)

Specifications

DA 400DesignSystem for cleaning and regulating compressed air

Connectable encoders

Up to 10 linear encoders, angle encoders or rotary encoders

Setup• Cyclone separator• Prefilter for particle sizes down to 5 µm, automatic condensate drain• Fine filter for dust, oil and water with particle sizes as fine as 0.01 µm, automaticcondensate drain• Activated carbon filter absorbs oil vapor• Pressure regulator for adjusting the output pressureOverpressure

TypicalMax.
Min.

7 · 105 Pa
12 · 105 Pa
4 · 105 Pa
If air pressure falls below 6 · 105 Pa and the air is saturated with water vapor, an additional
air drier must precede the DA 400.

Purity classes

Airflow in:
Airflow out:

Output overpressure

Can be set from 0.5 · 105 Pa to 3 · 105 Pa
The output overpressure to be set depends on the number of connected encoders andthe design of the compressed-air supply.

Operating temperature

5 °C to 30 °C

Flow rate

Max. 360 L/min ( 21.6 Nm /h)Connections

Inlet for compressed air:
G 1/4”Condensation trap prefilter/fine filter: Plug nipple 6 x 1
Outlet for compressed air:
G 1/4”

Maintenance

Filter replacementMass 1 kg5/6/4 (ISO 8573-1: 2010)
1/4/1 (ISO 8573-1: 2010)

3Up to 3 encoders connected: every two years
Up to 10 encoders connected: annually

510 Pa  1 bar
Product Information DA 400

12/2016

84

Pressure regulator
1 bar to 4 bars

Operating pressure
4 bars to 12 bars

Condensation runoff

 5.6*) Space required for filter replacement

 6.8

d 50 mConnection example for tubing 6 x 1
Parallel connectiond 0.5 m
d 50 md 0.5 md3md 0.5 md 50 md 0.5 md 50 mConnection example for tubing 6 x 1
Series connection
d9m

d1m
d9m
d1m
d9m
d1m

Product Information DA 400

12/2016

Accessories

Connecting piece for tubing 6 x 1
For linear encoders with throttle and gasket
on end section

ID 226270-02

Connecting piece for tubing 6 x 1
For linear encoders with throttle
on mounting block

ID 275239-01

Connecting piece for tubing 6 x 1
For angle encoders withthrottle and gasket

ID 207835-041)

ID 207834-021)

ID 630380-01

Swiveling screw fitting 90°, M5With seal

Swiveling screw fitting 180°, M5With seal
for LS 4x7/LC 4x51)

SpacerID 230905-01

Pressure switch DS-DA400
For monitoring pressure changes
Switching pressure can be set
from 0.2 bar to 2 bars

ID 810471-01

Pressure tubing, length 25 m
6 x 1 (Di = 4 mm)
8 x 1.25 (Di = 5.5 mm)T-joint
Quick disconnect 6 x 1

Threaded plug connection G1/4“for tubing 6 x 1 (DA 400 at the output)
for tubing 8 x 1.25 (DA 400 at the input)
Adapter plate AP-DA400
For attaching the DA 400
in place of the DA 300
Filter elements
Prefilter
Fine filter
Activated carbon1)

VF-DA 400
FF-DA 400
AK-DA 400

1 ± 0.2 bar

7 L/min to
10 L/min

1 ± 0.2 bar

7 L/min to
10 L/min

1 ± 0.2 bar

1 L/min to
4 L/min

ID 207881-09
ID 207881-35
ID 310094-02

ID 310092-01
ID 310092-03
ID 748674-01

ID 810415-01
ID 810416-01
ID 810421-01

An additional connecting piece is necessary.

DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 583301 Traunreut, Germany{ +49 8669 31-0| +49 8669 32-5061
E-mail: info@heidenhain.dewww.heidenhain.de894509 · 03 · A · 02 · 12/2016 · PDF

Further information• Brochure: Linear Encoders for
Numerically Controlled Machine Tools• Brochure: Angle Encoders with
Integral Bearing