Essential Guide: Key Points To Remember When Replacing A CO₂ Laser Tube

1. Power Down & Drain Completely – Safety First!

Turn off both your laser machine and chiller.

Unplug all power and signal cables.

Fully drain the cooling water from the old tube.

→ Why? Residual water can leak into electronics during removal, causing short circuits or internal corrosion.

2. Inspect Your Cooling System

Before installing the new tube:

Confirm your pump or chiller is functioning properly.

Verify water flows from the cathode (–) to anode (+)—reverse flow reduces efficiency.

Check hoses for kinks, cracks, or leaks.

Maintain coolant temperature between 20–25°C (68–77°F).

→ Hot water = lower power output + shortened tube life.

3. Proper Tube Mounting & Alignment

Install the tube perfectly level—never tilted.

Use rubber padding at mounting points to absorb vibration.

Don’t overtighten clamps—glass tubes crack under pressure.

Keep the output window spotless—no dust, oil, or fingerprints.

4. High-Voltage & Water Connections

Connect the high-voltage lead (usually at the rear) using high-quality silicone wire.

Insulate all connections with HV caps or high-voltage tape—exposed wires risk arcing.

Never reverse water inlet/outlet ports—this causes unstable output and overheating.

5. NEVER Power On Without Coolant!

❗ Never energize a dry CO₂ laser tube—even for a split second!

Doing so will instantly destroy the tube due to thermal shock and electrical arcing.

6. Re-Calibrate the Entire Optical Path

This step is non-negotiable. After tube replacement:

Perform a 3-point alignment (exit mirror → middle mirror → focus lens).

Ensure the laser dot is round, centered, and concentrated.

Poor alignment leads to:

→ Weak cutting

→ Burnt or damaged mirrors

→ Inconsistent engraving depth

7. First Test: Low-Power Pulse Check

Fire a short, low-power pulse (10–20% power).

Observe:

Is the beam round and solid (not split or fuzzy)?

Any crackling, arcing, or hissing sounds?

Any visible misalignment or flickering?

If anything seems off—stop and recheck before full operation.

8. Maintain Optimal Operating Temperature

High coolant temp? → Power drops, tube ages faster.

Hot workshop? → Laser stability suffers.

Cold climate? → Always drain water when idle to prevent freeze cracks.

Puri Laser Pro Tips (Factory-Recommended Best Practices)

As a leading CO₂ laser tube manufacturer, Puri Laser designs every tube for industrial reliability. To get the most out of your Puri 150W (or other wattage) laser tube, remember:

Maintain water flow ≥ 2.5 L/min for efficient cooling.

Eliminate air bubbles in tubing—they disrupt heat transfer and cause hot spots.

Use a matched power supply—excessive current accelerates electrode wear.

For continuous-duty applications, pair with a stable, temperature-controlled chiller.

Why Choose Puri Laser?

✅ Factory-direct quality – Strict QC from glass sealing to aging tests

✅ Longer lifespan – Advanced gas mixture & electrode engineering

✅ Consistent power output – Built for demanding cutting & engraving workflows

Upgrade your machine with a genuine Puri Laser CO₂ tube—where precision meets reliability, straight from the source.

Need model-specific guidance?

Tell us your:

Laser machine brand & model

Tube wattage (e.g., 100W, 130W, 150W)

Current issue (e.g., weak power, unstable beam)

We can give you more professional advice.

Puri Laser – Engineered in China, Trusted Worldwide.

Your Partner in High-Performance CO₂ Laser Solutions.

Sales Manager – Ella

Phone / WhatsApp: +86-15221358017

Email: info@purilaser.com