Series NL2

Maintenance units and components

The Aventics Series NL2 provides a complete filter spectrum for compressed-air preparation in port sizes G 1/8 to G 3/8: standard filters (NL2-FLS, 5 µm), ultra-fine filters (NL2-FLC, 0.01 µm), pre-filters (NL2-FLP, 0.3 µm), activated-carbon filters (NL2-FLA) and pressure regulators (NL2-RGS). A combined filter-pressure regulator (NL2-FRE) is also available.

NL2-RGS pressure regulators cover control ranges of 0-30, 0-60 and 0-100 bar and are available in stainless-steel (SS) construction and with various gauge-port options. Filter bowls are made from SSS (stainless steel), PBS (polycarbonate with guard) and PNB (polycarbonate without guard); drains are either manual (HO) or automatic (AO).

Filter type	Fineness	Application
NL2-FLP	0.3 µm	Pre-filter, coarse particles and condensate protection
NL2-FLS	5 µm	Standard filtration for general pneumatics
NL2-FLC	0.01 µm	Ultra-fine filtration, oil aerosol separation
NL2-FLA	Activated carbon	Residual oil and odour reduction, quality grade
NL2-FRE	5 µm + regulator	Combined filter and pressure regulator G 1/4

For the NL2 filter stage selection: FLP as the first stage where inlet air is heavily contaminated, FLS as the main stage for general industrial pneumatics, FLC for low-oil compressed air (e.g., upstream of instruments or spray guns), FLA as the final stage for food and pharmaceutical environments. NL2-RGS pressure regulators in SS construction suit corrosive environments or applications where stainless steel is specified. Bowl material choice follows process medium and ambient conditions: SSS for aggressive media, PBS with sight glass for visual status checking.

Typical applications: Multi-stage compressed-air preparation lines in manufacturing automation, ultra-fine and activated-carbon filtration upstream of sensors and instrumentation, compressed-air supply for food machinery and pharmaceutical filling lines (FLC+FLA combination), individual protection of compressed-air outlets at assembly stations, and repair or extension of existing G 1/8 to G 3/8 maintenance units.

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What are Aventics NL2 series pneumatic maintenance units and what industrial applications do they serve?

Aventics NL2 series pneumatic maintenance units are modular compressed air preparation systems designed for industrial pneumatic applications requiring precise air quality control. These units encompass filter regulators, lubricators, membrane dryers, and complete maintenance assemblies that condition compressed air by removing contaminants, regulating pressure, and adding lubrication where necessary. The NL2 series serves manufacturing industries including automotive assembly, packaging machinery, material handling systems, and process automation where consistent pneumatic performance is critical for production reliability.

What are the key technical selection criteria for NL2 series maintenance units with specific flow rates and pressure ranges?

NL2 series maintenance unit selection depends primarily on flow capacity, operating pressure range, and filtration requirements specific to the pneumatic system. Available flow rates include 50 L/min, 100 L/min, and 200 L/min variants as seen in the NL2-ADD membrane dryer models, with pressure regulation capabilities typically ranging up to 10 bar for standard industrial applications. Port sizes include G1/4 and G3/8 connections to match existing pneumatic infrastructure, while filtration grades from 5 micron to 40 micron accommodate different air quality requirements depending on downstream component sensitivity.

Which international standards and certifications apply to Aventics NL2 pneumatic maintenance units?

Aventics NL2 series maintenance units comply with ISO 8573 compressed air quality standards for contamination classification and ISO 14644 cleanroom compatibility requirements where applicable. The units meet EN ISO 13849 safety standards for pneumatic control systems and conform to ATEX directive 2014/34/EU for explosive atmosphere applications when specified with appropriate housing materials. Additionally, the series adheres to DIN EN 983 pneumatic fluid power standards for component design and testing, ensuring compatibility with European industrial pneumatic installations and regulatory compliance across manufacturing sectors.

What are the main differences between NL2-ACD, NL2-ACT, NL2-FRE, and NL2-ADD product variants?

The NL2-ACD represents 2-piece maintenance units combining air filtration with pressure regulation, while NL2-ACT provides 3-piece units adding lubrication capability for applications requiring oil mist injection. NL2-FRE models are standalone filter-regulator combinations offering pressure control with contamination removal in a single compact housing. The NL2-ADD series consists of membrane dryers specifically designed for moisture removal from compressed air streams, available in 50, 100, and 200 L/min flow capacities for applications requiring extremely dry air such as instrumentation and control systems.

What installation requirements and system compatibility considerations apply to NL2 maintenance units?

NL2 maintenance units require installation in the main air supply line upstream of pneumatic consumers, with adequate clearance for service access and pressure gauge visibility during operation. The units feature standard G1/4 and G3/8 BSP threaded connections compatible with ISO 228-1 pneumatic fittings, allowing direct integration into existing compressed air distribution systems. Installation orientation must follow manufacturer specifications with drain ports positioned downward for automatic condensate removal, and the units require mounting on stable surfaces capable of supporting operational loads plus vibration from connected pneumatic equipment.

What safety ratings and operating parameters define NL2 maintenance unit environmental capabilities?

NL2 maintenance units operate reliably across temperature ranges from -10°C to +60°C with working pressures up to 16 bar maximum depending on specific model configuration and safety factor requirements. The units typically achieve IP54 protection rating against dust ingress and water spray, making them suitable for standard industrial environments but requiring additional protection in washdown or corrosive atmospheres. Burst pressure ratings exceed working pressure by safety factors compliant with EN ISO 4414 pneumatic safety standards, while material compatibility extends to standard compressed air containing trace amounts of compressor oil and atmospheric moisture.

What maintenance schedule and service life expectations apply to Aventics NL2 pneumatic maintenance units?

NL2 maintenance units require filter element replacement every 6-12 months depending on air quality and operating hours, with visual inspection of pressure gauges and drain function recommended monthly during normal operation. Membrane dryers in the NL2-ADD series typically achieve 3-5 years service life before membrane replacement becomes necessary, while lubricator reservoirs require refilling every 3-6 months based on consumption rates and downstream equipment requirements. Complete unit overhaul including seal replacement should occur every 5-7 years or after 10,000 operating hours to maintain performance specifications and ensure continued compliance with ISO 8573 air quality standards.

Series NL2

NL2 filter spectrum

Selection criteria

Typical applications