Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN is a genuine two-in-one filter & regulator — a diversion-type water/particulate filter and a balanced pressure regulator built into ONE body. It has 3/4" ports, a 40 µm filter element and regulates 0.15 - 0.4 MPa (20 - 58 psi). It has no lubricator, so it adds no oil to the airflow.
- TypeFilter & regulator
- Port size3/4"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade40 µm
- Bowl materialMetal
- Drainautomatic
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN
The GAFR500C20ALJN is a filter and pressure regulator combined into a single body, with no lubricator section. This 3/4in version operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi) and uses a 40 um element to trap solid particles while the diversion structure spins out liquid water.
The metal bowl holds 108 cc of condensate, and the automatic drain clears it without manual attention. Weighing 950 g, this unit is sized for a machine header or multi-station line where a steady, lower regulated pressure is required.
Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (PT thread) |
| Filtering grade | 40 µm |
| Pressure range | 0.15 - 0.4 MPa (20 - 58 psi) |
| Type | Lower pressure |
| Bowl material | Metal |
| Drain type | Automatic drain |
| Fluid | Air |
|---|---|
| Max. pressure | 1.0 MPa (145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Capacity of drain bowl | 108 cc |
| Bracket | Not included (J) |
| Weight | 950 g |
Specifications follow the official AirTAC GAFR catalogue (pages 235-236). Air must not freeze in the unit. No gauge is supplied with this model — the gauge connection on a GAFR500 is 1/4" if you add one. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| C | Bowl material: Metal. Available on this body: PC (blank), Metal (C), Nylon (N). |
| 20 | Port size 3/4". This body offers 20 = 3/4". |
| A | Drain: Automatic drain. |
| L | Lower pressure type — 0.15 - 0.4 MPa (20 - 58 psi). This body offers Standard (S) or Lower pressure (L). |
| J | No bracket (J) — supplied without the mounting bracket. |
| N | No pressure gauge; 1/4" gauge connection. |
| (blank) | Filtering grade 40 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| (blank) | No reverse-flow valve. |
The filter and the regulator are ONE body here — there is no separate GAF filter or GAR regulator part to assemble. Need lubrication downstream too? Add a lubricator by ordering the matching GAFC500-20 F.R.L. combination instead.
Size Class & Flow Envelope
- GAFR2001/8"-1/4" · 2000 L/min
- GAFR3001/4"-1/2" · 3500 L/min
- GAFR4003/8"-1/2" · 7000 L/min
- GAFR5003/4" · 8000 L/min
- GAFR6003/4"-1" · 12000 L/min
Figures are the end of the flow curve plotted in the AirTAC catalogue at 0.7 MPa inlet pressure — a sizing envelope for comparing bodies, not a rated flow. Read the catalogue curve for a real duty point. Outlet pressure falls as flow rises, so size a body with headroom above your peak demand.
| This model | GAFR500 · 3/4" · curve to 8000 L/min |
|---|---|
| One size down | GAFR400 |
| One size up | GAFR600 (curve to 12000 L/min) |
| Add a lubricator | GAFC500-20 (F.R.L. combination) |
Where the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN Is Used
Machine header supply
Feed a multi-station assembly machine header where several valves and actuators draw air, with the automatic drain handling condensate from a wet compressor line.
Lower pressure test rig
Supply a test rig that requires a stable 0.3 MPa outlet for checking diaphragm actuators, where the lower range gives finer adjustment across the band.
Conveyor control cabinet
Protect a conveyor control cabinet's pneumatic logic elements with filtered air regulated to a safe low pressure, while the metal bowl resists rough handling.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN the Right Air-Prep Unit?
Choose this GAFR500 when you need a 3/4in port with a metal bowl and automatic drain for wet or unattended lines. The lower pressure type tops out at 0.4 MPa, so if your process may ever need more, select the standard S version instead. The J code means no mounting bracket is supplied, so plan for a panel mount or existing bracket, and the N code means no gauge is fitted - the 1/4in gauge connection is there if you add one later. The PT thread gives an MPa/psi gauge scale, and the 40 um element suits general shop air. For lines needing oil downstream, the matching GAFC500-20 combination adds a lubricator. 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the range.
Quick checklist
- ✓ Body size for your peak flow (3/4" here)
- ✓ Standard 0.9 MPa or lower-pressure 0.4 MPa
- ✓ Bowl material: PC (blank), Metal (C), Nylon (N)
- ✓ Drain: semi-auto + manual, or automatic
- ✓ Element 40 µm or 5 µm
- ✓ Bracket kept or removed (J); add a lubricator = GAFC
Installation & Maintenance Notes
- check Install with the airflow arrow: IN to OUT, gauge/knob accessible.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure with the pressed-in self-locking knob; pull to adjust, press to lock.
- check Drain condensate before the 108 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 950 g unit on its bracket, not on the tubing.
This is a filter and regulator only — it delivers filtered, pressure-set air with no added oil. If a downstream tool needs lubrication, add a separate lubricator or order the GAFC500-20 combination; do not expect an oil mist from this unit.
Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJN FAQ
Pressure range is 0.15-0.4 MPa (20-58 psi), max pressure 1.0 MPa (145 psi), proof pressure 1.5 MPa (215 psi), temperature range -5 to 70 C, drain bowl 108 cc, weight 950 g, port 3/4in, 40 um element, automatic drain, metal bowl, no gauge, no bracket.
The N after the port means no gauge is fitted, leaving the 1/4in gauge connection available for adding one later. The J code means the mounting bracket is omitted, which suits installations using existing brackets or direct panel mounting. Both options reduce cost when the standard accessories are not needed.
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