Practical Guide
How to use DeVilbiss PRO AIR 1/2/3 correctly: clean process air, stable pressure control, fewer paint defects
If compressed air pressure fluctuates or oil and water enter the system, spray quality suffers immediately – from craters to orange peel. In this guide, you’ll learn how to properly install, set up, and maintain PRO AIR filter regulators, including troubleshooting and practical reference settings.
Tip: Install the unit as close as possible to the point of use to minimize pressure loss and condensation issues.
Air Quality
Filtration down to 5 µm / 0.01 µm
PRO AIR 1 filters particles down to 5 µm. PRO AIR 2/3 adds a coalescer for fine liquid/solid particles down to 0.01 µm (reference values depending on operating conditions).
Flow Rate
Up to 900 l/min or 3,500 l/min
PRO AIR 2/3 are designed for 900 l/min, PRO AIR 1 for 3,500 l/min (model- and temperature-dependent reference values).
Service Interval
1000 h / 6 months
Replace filter elements when noticeable pressure drop occurs – at the latest every 6 months or after approx. 1000 operating hours.
Why PRO AIR makes such a difference in spray booths and air supply systems
- More stable process air → consistent spray pattern, less rework.
- Reduced oil/water/particle contamination → fewer surface defects and tool malfunctions.
- Two separately adjustable outlets (depending on unit) → clean supply for 1–2 workstations.
Product Overview: PRO AIR 1 vs. PRO AIR 2 vs. PRO AIR 3
| Variant | Filter Stage | Typical Use | Max. Flow* | Outputs |
|---|---|---|---|---|
| PRO AIR 1 | Pre-filter / particle filter up to 5 µm + regulator | General process air, high air volumes | 3,500 l/min* | 2 adjustable |
| PRO AIR 2 | As PRO AIR 1 + coalescer up to 0.01 µm | Booth air / fine filtration, suitable for PPE applications (per manual) | 900 l/min* | 2 adjustable |
| PRO AIR 3 | As PRO AIR 2 + activated carbon (oil carryover down to 0.003 ppm*) | Maximum clean air for sensitive applications | 900 l/min* | 2 adjustable |
* Values depend on operating conditions and temperature and are summarized here as reference values from the manual and product data.
Practical Tip: Drain condensate without mess
Use the drain function on the filter/coalescer depending on the situation:
- Manual: Keep the valve closed and drain only when needed – can be done under pressure if permitted.
- Semi-automatic: Drain opens automatically when pressure is released – ideal if the system is regularly depressurized.
Recommended Basic Settings (reference values from the manual)
1) Permissible pressure ranges
- Inlet pressure: up to max. 13 bar (reference).
- Outlet regulation range: 0–8 bar (reference).
- Pressure gauge scale: 0–11 bar / 0–160 psi.
2) Adjustment logic (important!)
- Always adjust pressure from low to high (not from high down).
- Secure the setpoint: push regulator knob to lock, pull to unlock.
Note: The correct working pressure depends on the connected tool or process. Use the values above as safe framework parameters and fine-tune according to your application.
Professional Workflow: Installation & Commissioning in 7 Steps
- Select location: Install the unit as close as possible to the point of use and operate it upright.
- Check flow direction: Air must flow according to the arrow marked on the housing.
- Use isolation valve (PRO AIR 2/3): Close/open the inlet isolation valve – helpful for maintenance and condensate draining.
- Ensure grounding: Connect grounding via the designated grounding point and verify continuity (target: very low resistance; manual states < 1 kΩ as reference).
- Increase pressure safely: Turn regulator fully down first (counterclockwise), then slowly increase to setpoint.
- Separate outlets/workstations: Shut off unused outlets and fine-tune pressure per process.
- Lock & document: Push regulator knob to lock and document setpoint, date, and filter status in the maintenance plan.
Troubleshooting: 4 common issues (and quick fixes)
1) Pressure drops or fluctuates
- Check filter elements: pressure drop is a clear sign replacement is needed.
- Adjust correctly: always increase pressure from low to high.
2) Condensate buildup, drain not working properly
- Check drain mode: manual vs. semi-automatic.
- Do not install unit above sensitive electrical equipment.
3) Planned maintenance but system cannot be depressurized
- Fully depressurize: shut off supply, turn regulator fully down, relieve residual pressure.
- Use inlet isolation valve on PRO AIR 2/3 for controlled pressure release.
4) Gauge/display issue after replacement
- Install pressure gauge hand-tight only (no tools).
- Seal threads with liquid sealant – do not use PTFE tape (manufacturer instruction).
Maintenance: 5 points that really matter
- Safety first: Always fully depressurize before opening bowls or elements.
- Replacement intervals: Replace immediately if pressure drop occurs – otherwise at least every 6 months or 1000 h.
- Clean element replacement: Unscrew bowl, remove element carefully – avoid cross-threading.
- No aggressive cleaners: Do not use solvents or harsh chemicals.
- Grounding remains mandatory: After maintenance, ensure grounding continuity is intact.
Choose the right PRO AIR version now
Looking for stable pressure, clean air, and fewer paint defects? Choose the filtration level that fits your process – from high airflow to maximum fine filtration.
Conclusion
With the right PRO AIR version (1/2/3), you ensure stable pressure conditions and significantly cleaner process air. The basics matter most: correct flow direction, installation close to the point of use, reliable grounding, pressure adjustment from low to high – and consistent filter replacement based on condition or at the latest every 6 months / 1000 hours.
