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Siemens Industry, Inc.

POWERS

Controls

Technical Instructions

Document No. 155-312P25

AF 908-5

September 10, 2018

Air Line Filter Assembly

Description

The AF 908 Air Line Filter Assembly removes particulate matter, oil, and water from a

compressed air source. The filter element coalesces oil and water droplets, converting

them into bulk liquid that is easily drained from the housing. The particulate rating also

ensures retention of solid particles. The unit is readily maintained without disassembly

of the connecting piping.

Features

• Patented design maintains high oil removal efficiency for the life of the

filter element

• Removes 99.999+ % of oil aerosols (remaining oil is in a vapor state)

• Removes solid particles 0.01 microns and larger

Application

Use the AF 908 filter assembly on pneumatic control systems to protect control devices

against liquid or particulate contamination.

Product Numbers

908-051 Air Line Filter Assembly

908-052 Replacement Filter Element

Warning/Caution

Notations

WARNING

Personal injury or loss of life may occur if you do not perform a

procedure as specified.

CAUTION

Equipment damage may occur if you do not follow a procedure as

specified.

Specifications

Operating

Maximum pressure 300 psig (2068 kPa)

Nominal capacity @ 100 psig 20 scfm (33.9 m

/h)

Nominal pressure drop 3 psi (20.68 kPa)

Summary of content (4 pages)

PAGE 1
Technical Instructions Document No. 155-312P25 AF 908-5 September 10, 2018 POWERS® Controls Air Line Filter Assembly Description The AF 908 Air Line Filter Assembly removes particulate matter, oil, and water from a compressed air source. The filter element coalesces oil and water droplets, converting them into bulk liquid that is easily drained from the housing. The particulate rating also ensures retention of solid particles. The unit is readily maintained without disassembly of the connecting piping.
PAGE 2
Technical Instructions Document No. 155-312P25 September 10, 2018 Specifications (Continued) Operating Maximum recommended pressure drop 10 psi (68.9 kPa) CAUTION: Under no circumstances should the pressure differential across the filter exceed 50 psi (345 kPa); an excess pressure can cause failure of the filter element. Physical Removal rating (microns) Particles Oil and water Operating Temperature 0.01 0.
PAGE 3
AF 908 Air Line Filter Assembly Sizing Technical Instructions Document No. 155-312P25 September 10, 2018 The AF 908 coalescing filter assembly is rated for a nominal 20 scfm @ 100 psig (33.9 m3/h @ 689 kPa) flow to the system. It is recommended for use on all systems up to this nominal capacity. Larger installations may require a special filter or a parallel installation of several standard filters. NOTE: Nominal air capacities vary with supply pressures.
PAGE 4
Technical Instructions Document No. 155-312P25 September 10, 2018 Service (Continued) Fitler Element Replacement The filter element should provide a minimum life of approximately 1500 hours of continuous operation at rated capacity. For maximum filtration efficiency, replace the element when the pressure drop reaches 10 psi (69 kPa) or annually, whichever occurs first. Use a 908-052 filter element to replace the filter element (Figure 2) in an AF 908 filter assembly as follows: 1.